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NCERT Exemplar Class 9 Science Solutions Chapter 11 Work and Energy

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NCERT Exemplar Class 9 Science Solutions Chapter 11 Work and Energy

Edited By Safeer PP | Updated on Sep 01, 2022 05:10 PM IST

NCERT exemplar Class 9 Science solutions chapter 11 involves the learning and understanding about work, energy, and power. Students will learn about the conservation of mechanical energy and its application in this chapter of NCERT. The NCERT exemplar Class 9 Science chapter 11 solutions are put together by our highly skilled team of subject matter experts to provide the student with study material for NCERT Class 9 Science. These NCERT exemplar Class 9 Science chapter 11 solutions provide step by step approach to the problems based on work and energy. The CBSE Class 9 Syllabus is followed in the preparation of NCERT exemplar Class 9 Science solutions chapter 11.

NCERT Exemplar Class 9 Science Solutions Chapter 11-MCQ

Question:1

When a body falls freely towards the earth, then its total energy
(a) increases
(b) decreases
(c) remains constant
(d) first increases and then decreases

Answer: [C]
Solution.

The total energy of any body is the sum of kinetic energy and potential energy.
TE =KE + PE
When a body falls freely towards the earth; kinetic energy of the body increases and potential energy of the body decreases.
However, by the law of conservation of energy total energy of the body remain constant.
The correct answer to this question is option C.

Question:2

A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car
(a) does not change
(b) becomes twice to that of initial
(c) becomes 4 times that of initial
(d) becomes 16 times that of initial

Answer: [A]

Solution.
The kinetic energy of a body increases on increasing speed.
KE=\frac{1}{2}mv^{2}
The potential energy of the body increases by increasing height from the surface of earth.
PE=mgh
In the given question, the car is increasing speed on the level road. Hence, its kinetic energy must be increasing.
The kinetic energy will be 16 times of the initial kinetic energy as velocity becomes four times.
The car's height from the ground is not changing as it is moving on a level road.
Therefore, we can say that the potential energy of the car is not changing.
Hence, the correct answer to this question is option A.

Question:3

In case of negative work the angle between the force and displacement is
(a) 0^{\circ} (b) 45^{\circ} (c) 90^{\circ} (d ) 180^{\circ}

Answer: [D]
Solution.
Work done by any force is defined as:
W=Fd\cos \theta
This work done can be positive, negative or zero depending on the angle between force and displacement.
If the angle between them is acute, then work done will be positive because \cos \theta will be positive.
If the angle between them is 90^{\circ}, then the work done will be zero.
If the angle between them is obtuse, then the work done will be negative.
W=Fd(\cos 180^{\circ})=-Fd
Hence, the correct answer is option D.

Question:4

An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same
(a) acceleration
(b) momenta
(c) potential energy
(d) Kinetic energy

Answer: [A]
Solution.

When a body falls under gravity, the body’s acceleration does not depend on mass of the body.
Therefore, acceleration for both the spheres will be same at that instant.
Their velocities will be the same at that instant too.
v = u + at
Momentum and kinetic energy depend on speed as well as mass.
KE=\frac{1}{2}mv^{2}
P=mv
As mass of both the spheres is different; however, speed is the same; hence their momentum and kinetic energy will be different.
Gravitational potential energy is defined as:
PE=mgh
Therefore, it would be different for both the spheres of different mass at same the height.
Hence, the correct answer is option A.

Question:5

A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g =10 m s^{-2})
(a) 6 \times 10^3 J
(b) 6 J
(c) 0.6 J
(d) zero

Answer: [D]
Solution.
We know that work is defined as:
W=Fd\cos \theta
As the girl is carrying a schoolbag of 3 kg, the girl must be applying force in vertically upward direction against gravity.
The displacement of the girl is in the horizontal direction, as it is moving on a level road.
The angle between force and displacement is 90^{\circ}.
Therefore, by the formula, work done by the girl against gravity will be zero.
W=Fd\cos 90^{\circ}=0
Hence, the correct answer for this question is option D.

Question:6

Which one of the following is not the unit of energy?
(a) joule
(b) newton metre
(c) kilowatt
(d) kilowatt hour

Answer: [C]
Solution.
We know that work done and energy have same unit.
The SI unit of energy is Joule.
Work done is defined as product of force and displacement; therefore, its unit will be newton meter.
W=Fd\cos \theta
Power is defined as work done per unit time, and its unit will be watt or kilowatt.
If we multiply power with time, we will get energy or work done.
Therefore, kilowatt-hour will be the unit of energy.
[Only kilowatt is the unit of power, and that is not unit of energy.]
Correct answer of this question is option C.

Question:7

The work done on an object does not depend upon the
(a) displacement
(b) force applied
(c) angle between force and displacement
(d) initial velocity of the object

Answer: [D]
Solution.
We know that the work done is defined as:
W=Fd\cos \theta
It means work done depends on force, displacement and angle between force and displacement.
Work done does not depend on any other property other than the three mentioned above.
Therefore, we can say work done does not depend on the initial velocity of the object.
Hence the correct option to this question is option D.

Question:8

Water stored in a dam possesses
(a) no energy
(b) electrical energy
(c) kinetic energy
(d) potential energy

Answer:

Answer: [D]
Solution.
Water stored in a dam remains at rest.
The kinetic energy of the water stored will be zero as its speed is zero.
KE=\frac{1}{2}mv^{2}
Electrical energy is not possessed by stored water.
The water has mass, and it occupies the space above the surface of ground.
Therefore, the water will have gravitational potential energy.
PE=mgh
Hence, the correct answer to this question is option D.

Question:9

A body is falling from a height h. After it has fallen a height h/2, it will possess
(a) only potential energy
(b) only kinetic energy
(c) half potential and half kinetic energy
(d) more kinetic and less potential energy

Answer:

Answer: [C]
Solution.
When a body is dropped from a height, it gets acceleration due to gravity.
Acceleration increases its speed; hence its kinetic energy keeps on increasing.
KE=\frac{1}{2}mv^{2}
The ball is dropped from height H, and we are analyzing the ball at height H/2.
The total energy of the ball will not change in free fall under gravity.
As the height becomes half of the initial height, the potential energy will become half.
PE=mgh
This decrease in potential energy, will come in the form of kinetic energy because total energy is conserved.
TE = PE +KE
Therefore, kinetic energy of the ball will be half of initial potential energy.
Hence, the correct answer to this question is option C.

NCERT Exemplar Class 9 Science Solutions Chapter 11-Short Answer

Question:10

A rocket is moving up with a velocity v. If the velocity of this rocket is suddenly tripled, what will be the ratio of two kinetic energies?

Answer:

Solution.
We know that kinetic energy is defined as:
KE=\frac{1}{2}mv^{2}
We can see that the kinetic energy will be proportional to the square of speed for a given body of constant mass.
As the rocket's speed is suddenly tripled, the rocket's kinetic energy will be nine times.
KE=\frac{1}{2}mv^{2}
\frac{KE_{i}}{KE_{f}}=\frac{V^{2}_{i}}{V^{2}_{f}}

Question:11

Avinash can run with a speed of 8 ms^{-1} against the frictional force of 10 N, and Kapil can move with a speed of 3 ms^{-1} against the frictional force of 25 N. Who is more powerful and why?

Answer:

Solution.
Power of anything is defined as the rate of work done by that thing.
Mathematically, power is defined as product of force and velocity.
Power =Fv
If we calculate the power of Avinash and Kapil, by the given information:
Power_{Avinash}=10\times 8=80watt
Power_{Kapil}=25\times 3=75watt
Therefore, it is quite visible that power of Avinash is more than the power of Kapil.

Question:12

A boy is moving on a straight road against a frictional force of 5 N. After travelling a distance of 1.5 km he forgot the correct path at a round-about of radius 100 m. However, he moves on the circular path for one and half cycle and then he moves forward upto2.0km. Calculate the work done by him.


Answer:

Answer: 22210 J
Solution.
The boy has to apply force in the direction of its motion against frictional force.
Therefore, the angle between force and displacement will always be 0^{\circ}.
For calculating the work done, we have to multiply force with the distance travelled by the boy.
The magnitude of the force is always 5 newton.
Total distance travelled, will be equal to sum of 3/2 times perimeter of the circular path and distance travelled along a straight track.
d=1500m+(3/2)(2\pi \times 100)m+2000m
d=4442m
Hence work done:
W=5\times 4442=22210J

Question:13

Can any object have mechanical energy even if its momentum is zero? Explain.

Answer:

Solution.
Mechanical energy is the sum of kinetic energy and potential energy. It is also known as total energy.
Kinetic energy is the virtue of motion which comes with speed.
KE=\frac{1}{2}mv^{2}
Potential energy is the virtue of position which comes with a height from the ground surface.
PE=mgh
As the object has zero momentum, it means it is not moving.
Momentum is defined as the product of mass and speed.
P = mv
A body at rest and some height from the ground will have potential energy or mechanical energy.

Question:14

Can any object have mechanical energy even if its momentum is zero? Explain.

Answer:

Solution.
Mechanical energy consists of both potential energy and kinetic energy. Momentum is said to be zero when the velocity is zero. Hence, there is no kinetic energy but the object may have potential energy.

Question:15

The power of a motor pump is 2 kW. How much water per minute the pump can raise to a height of 10 m? (Given g = 10 m s^{-2} )

Answer:

1200kg
Solution.
The power of pump is 2 kW, it means it can give energy equal to 2000 Joule in one second.
Total time given is one minute; therefore, the motor pump's total energy will be equal to 1,20,000 joule.
Energy=power\times time
This energy will be equal to the potential energy of the water raised to 10 m.
Let mass of the water raised is M kg.
Therefore, its potential energy at height H =10 m will be:
PE=mgh
=M\times 10\times 10
\Rightarrow 120000=100M
\Rightarrow M=1200kg
It means 1200 kg water can be raised up height 10 m, in one minute by this motor pump.

Question:16

The weight of a person on a planet A is about half that on the earth. He can jump upto 0.4 m height on the surface of the earth. How high he can jump on the planet A?

Answer:

Answer: 0.8m
Solution.
We will assume that the energy level (power) of a person does not change on changing planet.
Energy used by the person will increase its potential energy.
Therefore potential energy at the end will be same on planet A and earth.
We know the formula of potential energy is given as:
PE=mgh
As acceleration due to gravity is half on planet A. Therefore, the height raised will be twice on planet A.
Hence, height raised on planet A will be 0.8m.

Question:17

The velocity of a body moving in a straight line is increased by applying a constant force F, for some distance in the direction of the motion. Prove that the increase in the kinetic energy of the body is equal to the work done by the force on the body.

Answer:

Solution.
By the equation of motion, we can say:
v^{2}=u^{2}+2as
\Rightarrow s=\frac{v^{2}-u^{2}}{2a}
By Newton’s second law, we can say:
F= ma
We know that work done is defined as the product of force and displacement if the body is moving on a straight track.
W=Fs
\Rightarrow W=ma\times \frac{v^{2}-u^{2}}{2a}
\Rightarrow W=m\times \frac{v^{2}-u^{2}}{2}
\Rightarrow W=\frac{mv^{2}}{2}-\frac{mu^{2}}{2}
\Rightarrow W=KE_{f}-KE_{i}
Hence, work done is equal to the change in kinetic energy.

Question:18

Is it possible that an object is in the state of accelerated motion due to external force acting on it, but no work is being done by the force. Explain it with an example.

Answer:

Solution.
Yes, it is possible. A body moves in a uniform circular motion is an example of accelerated motion. Consider the motion of the Earth around the Sun. The Earth is constantly moving in a circular path in a direction perpendicular to the gravitational pull of the Sun. So, the work done by the gravitational force is zero. Thus, the work done can be zero for an accelerated body.

Question:19

A ball is dropped from a height of 10 m. If the energy of the ball reduces by 40\% after striking the ground, how much high can the ball bounce back?(g = 10 m s^{-2})

Answer:

Solution.
When the ball is dropped from 10 meters, the total energy will be in the form of potential energy.
Potential energy can be calculated as:
PE=mgh
After striking the ground, 40\% of energy is lost. Hence, it will have only 60\% of energy.
With the help of this 60\% energy, the object will attain maximum height.
Therefore, if height attained is H then we can say:

60\%(mg(10))=mgh

\Rightarrow \frac{60}{100}(mg(10))=mgh

\Rightarrow h=6m
The height attained is 6m.

Question:20

If an electric iron of 1200 W is used for 30 minutes every day, find electric energy consumed in the month of April.

Answer:

Answer: 64800000J
Solution.
The electrical energy consumed is calculated in units.
We know that one unit is equal to the energy of 1 kilowatt-hour.
Power of heater = 1200 watt =1.2 kilowatt
Per day usage = 30 minutes = 0.5 hour
Energy consumed per day = (1.2 kilowatt) (0.5 hour) = 0.6 units.
In April, total number of days = 30
Therefore, total consumption will be: Energy = (30) (0.6) = 18 units
It can be converted in joules:
1unit=1000\times 3600J
\Rightarrow 18unit=(18\times 1000\times 3600)J=64800000J

NCERT Exemplar Class 9 Science Solutions Chapter 11-Long Answer

Question:21

A light and a heavy object have the same momentum. Find out the ratio of their kinetic energies. Which one has a larger kinetic energy?

Answer:

Solution.
For any object of mass m, the kinetic energy and momentum are defined as:
KE=\frac{1}{2}mv^{2}
P=mv
Here v is the speed of the object.
We try to eliminate speed and to find out the relation between kinetic energy and momentum.
KE=\frac{1}{2}m\left ( \frac{p}{m} \right )^{2}
\Rightarrow KE=\frac{1}{2}\frac{p^{2}}{m}
If two bodies have the same momentum, then kinetic energy will be inversely proportional to the mass of the body.
Therefore, the lighter body will have more kinetic energy than the heavy body.

Question:22

An automobile engine propels a 1000 kg car (A) along a levelled road at a speed of 36 km h–1. Find the power if the opposing frictional force is 100 N. Now, suppose after travelling a distance of 200 m, this car collides with another stationary car (B) of same mass and comes to rest. Let its engine also stop at the same time. Now car (B) starts moving on the same level road without getting its engine started. Find the speed of the car (B) just afte the collision.

Answer:

Solution.
Mass of the car = 1000 kg
Speed of car A = 36 km/h = 10 m/s
Frictional force =100 N
We know that power is defined as:
Power = Fv
Hence, power of engine will be:
Power = (100N) (10m/s) =1000 watt.
In the collision, no external force is involved. Therefore, total momentum of both cars will be conserved.
m_{A}u_{A}+m_{B}u_{B}=m_{A}v_{A}+m_{B}v_{B}
Where m_{A}=1000kg;m_{B}=1000kg;u_{A}=10m/s;u_{B}=0m/s;v_{A}=0m/s;
By putting the values, we will get:
v_{B}=10m/s;

Question:23

A girl having mass of 35 kg sits on a trolley of mass 5 kg. The trolley is given an initial velocity of 4 ms^{-1} by applying a force.
The trolley comes to rest after traversing a distance of 16 m.

(a) How much work is done on the trolley?
(b) How much work is done by the girl?

Answer:

Solution
Mass of the girl = 35 kg
Mass of the trolley = 5 kg
Initial velocity of trolley = 4m/s
Total distance travelled by trolley = 16 m
We know that
\\\;v^2-u^2 = 2as \\\; a=\frac{v^2-u^2}{2s} \\\; = \frac{-16}{2\times 16}= -0.5

Force=ma=40\times (-0.5) = -20N
\\\;work\; done\; on\; the\; trolley\;=20N\times 16m=320 J.\\\; work \;done \;by \;the\; girl =0 J.

Question:24

Four men lift a 250 kg box to a height of 1 m and hold it without raising or lowering it. (a) How much work is done by the men in lifting the box? (b) How much work do they do in just holding it? (c) Why do they get tired while holding it? (g = 10 ms^{-2})

Answer:

Solution.
Mass of the box = 250 kg
Height attained = 1 m
(a) Work done in lifting the block will be stored as potential energy
W=PE=mgh
After calculating, the work done will be 2500 joule.
(b) When they hold it in the air without any movement, the displacement of box will be zero.
We know work is defined as:
W=Fd\cos \theta
Hence, work done will be zero.
(c) When they hold it in air without any movement, their muscles are stretched.
These stretched muscles requires energy and causes fatigue and tiredness.

Question:25

What is power? How do you differentiate kilowatt from kilowatt hour? The Jog Falls in Karnataka state are nearly 20 m high. 2000 tons of water falls from it in a minute. Calculate the equivalent power if all this energy can be utilized? (g = 10 m s^{-2})

Answer:

Solution

Power of anything is defined as the rate of work done by that thing or energy supplied per unit time.
Mathematically, power is defined as the product of force and velocity.
Power = F v.
Power is defined as work done per unit time and its unit will be watt or kilowatt.
If we multiply power with time, we will get energy or work done.
Therefore, kilowatt -hour will be the unit of energy.
[Only kilowatt is the unit of power and that is not unit of energy.]
In one minute all the potential energy of water can be utilised.
Energy utilised = Potential energy = mgh
PE=(2000\times 10^{3}kg)\times 10ms^{-2}\times 20m
=4\times 10 ^{8}Joule
Now time t = 1 minute = 60 seconds
Hence power will be
power=\frac{energy}{time}=\frac{4\times 10^{8}Joule}{60seconds}=6.67\times 10^{6}watt

Question:26

How is the power related to the speed at which a body can be lifted? How many kilograms will a man working at the power of 100 W, be able to lift at constant speed of 1 m s^{-1} vertically? (g = 10 m s^{-2})

Answer:

Power of anything is defined as the rate of work done by that thing or energy supplied per unit time.
Mathematically, power is defined as the product of force and velocity.
Power = F v.
Power is defined as work done per unit time and its unit will be watt or kilowatt.
If we multiply power with time, we will get energy or work done.
If a man is lifting a body with constant speed, he has to apply force equal to his weight.
Force applied: F = mg = 10m N
Speed attained: V = 1 m s^{-1}
Power used: P = 100W
By using the formula of power:
100 = (10m) (1)
m = 10kg.

Question:27

Define watt. Express kilowatt in terms of joule per second. A 150 kg car engine develops 500 W for each kg. What force does it exert in moving the car at a speed of 20 m s^{-1} ?

Answer:

Solution.
Power of anything is defined as the rate of work done by that thing or energy supplied per unit time.
Mathematically, power is defined as the product of force and velocity.
Power = F v.
Power is defined as work done per unit time and its unit will be watt (in SI unit) or kilowatt.
If we multiply power with time, we will get energy or work done.
power=\frac{energy}{time}
unit of power=\frac{joule}{second}=watt
1 kilowatt = 1000 watt = 1000 joule/second.
For the car:
Mass of the car: m = 150 kg
Speed attained: V = 20 m s^{-1}
Power used: P = 500W per kg hence,
Total power will be:
Power=500\times 150=75000watt
By using the formula of power:
75000 = (Force) (20)
Force = 3750 N.

Question:28

Compare the power at which each of the following is moving upwards against the force of gravity? (given: g = 10 m s^{-2})
(i) a butterfly of mass 1.0 g that flies upward at a rate of 0.5 m s^{-1}.
(ii) a 250 g squirrel climbing up on a tree at a rate of 0.5 m s^{-1}

Answer:

Solution.
Power of anything is defined as the rate of work done by that thing or energy supplied per unit time.
Mathematically, power is defined as the product of force and velocity.
Power = F v.
In lifting a body with constant speed, it has to apply force equal to his weight.
(i)For the Butterfly:
Mass of the butterfly: m = 1 gram = 0.001 kg
Speed attained: V= 0.5 m s^{-1}
Force required: F = mg = 0.01 N
By using the formula of power:
Power=0.01\times 0.5=5\times 10^{-3}watt
(ii)For the Squirrel:
Mass of the squirrel: m =250 gram = 0.250 kg
Speed attained: V = 0.5 m s–1
Force required: F = mg = 2.5 N
By using the formula of power:
Power=2.5\times 0.5=1.25watt

NCERT Exemplar Solutions Class 9 Science Chapter 11 Important Topics:

The chapter on Work and Energy covers the below-mentioned topics via NCERT exemplar Class 9 Science solutions chapter 11 :

  • Work, power, and energy discussed quantitatively.
  • The mathematical definition of work is given and it is proved that the work done by any force will be equal to change in kinetic energy of the system.
  • NCERT exemplar Class 9 Science solutions chapter 11 discusses the concept of mechanical energy is discussed which constitutes kinetic energy and potential energy.
  • In this chapter power of any machine or force is also mathematically defined which is the rate of work done by that particular force or machine.
  • The importance of the angle between force and displacement in the calculation of work is clearly explained in this chapter of work and energy.

NCERT Class 9 Exemplar Solutions for Other Subjects:

NCERT Class 9 Science Exemplar Solutions for Other Chapters:

Features of NCERT Exemplar Class 9 Science Solutions Chapter 11:

These Class 9 Science NCERT exemplar chapter 11 solutions provide the basic understanding of work, energy, and power. These NCERT exemplar Class 9 Science solutions chapter 11 can be utilized by the students of Class 9 as reference material to get a better understanding of the work and energy-based practice questions.

NCERT exemplar Class 9 Science solutions chapter 11 pdf download enables the students to study and practice NCERT exemplar Class 9 Science chapter 11 in an offline environment. This feature is provided to the students for an uninterrupted learning experience and for preparing for the JEE Main and NEET entrance exams in a better way.

Also, read - NCERT Solutions for Class 9

Check the Solutions of Questions Given in the Book

Also, Read NCERT Solution Subject Wise

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Also Check NCERT Books and NCERT Syllabus here

Frequently Asked Question (FAQs)

1. When an apple falls from the tree what will happen to its potential energy?

We know the potential energy is due to gravitational force and it is also known as gravitational potential energy. This gravitational potential energy depends on the height from the surface of earth; more height means more energy. Therefore, if an apple falls, its potential energy will decrease.

2. A boy raises 50 blocks of one KG up to height 5 m in 50 turns and another man raises one block of 50 KG to the same height; who has done more work and who has more power?

Both of them have raised the same amount of mass up to the same height; therefore, both of them have done equal amounts of work. The power of the man is apparently more than the power of the boy because the same work is done by man in less time.

3. How important is the chapter Work and Energy for competitive exams like JEE Advanced and NEET?

 This is one of the most important chapters for JEE Main, JEE Advanced and NEET. This chapter will be dealt in Class 11 NCERT Physics in detail.

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A block of mass 0.50 kg is moving with a speed of 2.00 ms-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is

Option 1)

0.34\; J

Option 2)

0.16\; J

Option 3)

1.00\; J

Option 4)

0.67\; J

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Option 1)

2.45×10−3 kg

Option 2)

 6.45×10−3 kg

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 9.89×10−3 kg

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12.89×10−3 kg

 

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2,000 \; J - 5,000\; J

Option 2)

200 \, \, J - 500 \, \, J

Option 3)

2\times 10^{5}J-3\times 10^{5}J

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20,000 \, \, J - 50,000 \, \, J

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Option 1)

K/2\,

Option 2)

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Option 3)

zero\;

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K/4

In the reaction,

2Al_{(s)}+6HCL_{(aq)}\rightarrow 2Al^{3+}\, _{(aq)}+6Cl^{-}\, _{(aq)}+3H_{2(g)}

Option 1)

11.2\, L\, H_{2(g)}  at STP  is produced for every mole HCL_{(aq)}  consumed

Option 2)

6L\, HCl_{(aq)}  is consumed for ever 3L\, H_{2(g)}      produced

Option 3)

33.6 L\, H_{2(g)} is produced regardless of temperature and pressure for every mole Al that reacts

Option 4)

67.2\, L\, H_{2(g)} at STP is produced for every mole Al that reacts .

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Option 1)

0.02

Option 2)

3.125 × 10-2

Option 3)

1.25 × 10-2

Option 4)

2.5 × 10-2

If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

Option 1)

decrease twice

Option 2)

increase two fold

Option 3)

remain unchanged

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be a function of the molecular mass of the substance.

With increase of temperature, which of these changes?

Option 1)

Molality

Option 2)

Weight fraction of solute

Option 3)

Fraction of solute present in water

Option 4)

Mole fraction.

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Option 1)

twice that in 60 g carbon

Option 2)

6.023 × 1022

Option 3)

half that in 8 g He

Option 4)

558.5 × 6.023 × 1023

A pulley of radius 2 m is rotated about its axis by a force F = (20t - 5t2) newton (where t is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is 10 kg m2 , the number of rotations made by the pulley before its direction of motion if reversed, is

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less than 3

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more than 3 but less than 6

Option 3)

more than 6 but less than 9

Option 4)

more than 9

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Bio Medical Engineer

The field of biomedical engineering opens up a universe of expert chances. An Individual in the biomedical engineering career path work in the field of engineering as well as medicine, in order to find out solutions to common problems of the two fields. The biomedical engineering job opportunities are to collaborate with doctors and researchers to develop medical systems, equipment, or devices that can solve clinical problems. Here we will be discussing jobs after biomedical engineering, how to get a job in biomedical engineering, biomedical engineering scope, and salary. 

4 Jobs Available
Ethical Hacker

A career as ethical hacker involves various challenges and provides lucrative opportunities in the digital era where every giant business and startup owns its cyberspace on the world wide web. Individuals in the ethical hacker career path try to find the vulnerabilities in the cyber system to get its authority. If he or she succeeds in it then he or she gets its illegal authority. Individuals in the ethical hacker career path then steal information or delete the file that could affect the business, functioning, or services of the organization.

3 Jobs Available
GIS Expert

GIS officer work on various GIS software to conduct a study and gather spatial and non-spatial information. GIS experts update the GIS data and maintain it. The databases include aerial or satellite imagery, latitudinal and longitudinal coordinates, and manually digitized images of maps. In a career as GIS expert, one is responsible for creating online and mobile maps.

3 Jobs Available
Data Analyst

The invention of the database has given fresh breath to the people involved in the data analytics career path. Analysis refers to splitting up a whole into its individual components for individual analysis. Data analysis is a method through which raw data are processed and transformed into information that would be beneficial for user strategic thinking.

Data are collected and examined to respond to questions, evaluate hypotheses or contradict theories. It is a tool for analyzing, transforming, modeling, and arranging data with useful knowledge, to assist in decision-making and methods, encompassing various strategies, and is used in different fields of business, research, and social science.

3 Jobs Available
Geothermal Engineer

Individuals who opt for a career as geothermal engineers are the professionals involved in the processing of geothermal energy. The responsibilities of geothermal engineers may vary depending on the workplace location. Those who work in fields design facilities to process and distribute geothermal energy. They oversee the functioning of machinery used in the field.

3 Jobs Available
Database Architect

If you are intrigued by the programming world and are interested in developing communications networks then a career as database architect may be a good option for you. Data architect roles and responsibilities include building design models for data communication networks. Wide Area Networks (WANs), local area networks (LANs), and intranets are included in the database networks. It is expected that database architects will have in-depth knowledge of a company's business to develop a network to fulfil the requirements of the organisation. Stay tuned as we look at the larger picture and give you more information on what is db architecture, why you should pursue database architecture, what to expect from such a degree and what your job opportunities will be after graduation. Here, we will be discussing how to become a data architect. Students can visit NIT Trichy, IIT Kharagpur, JMI New Delhi

3 Jobs Available
Remote Sensing Technician

Individuals who opt for a career as a remote sensing technician possess unique personalities. Remote sensing analysts seem to be rational human beings, they are strong, independent, persistent, sincere, realistic and resourceful. Some of them are analytical as well, which means they are intelligent, introspective and inquisitive. 

Remote sensing scientists use remote sensing technology to support scientists in fields such as community planning, flight planning or the management of natural resources. Analysing data collected from aircraft, satellites or ground-based platforms using statistical analysis software, image analysis software or Geographic Information Systems (GIS) is a significant part of their work. Do you want to learn how to become remote sensing technician? There's no need to be concerned; we've devised a simple remote sensing technician career path for you. Scroll through the pages and read.

3 Jobs Available
Budget Analyst

Budget analysis, in a nutshell, entails thoroughly analyzing the details of a financial budget. The budget analysis aims to better understand and manage revenue. Budget analysts assist in the achievement of financial targets, the preservation of profitability, and the pursuit of long-term growth for a business. Budget analysts generally have a bachelor's degree in accounting, finance, economics, or a closely related field. Knowledge of Financial Management is of prime importance in this career.

4 Jobs Available
Data Analyst

The invention of the database has given fresh breath to the people involved in the data analytics career path. Analysis refers to splitting up a whole into its individual components for individual analysis. Data analysis is a method through which raw data are processed and transformed into information that would be beneficial for user strategic thinking.

Data are collected and examined to respond to questions, evaluate hypotheses or contradict theories. It is a tool for analyzing, transforming, modeling, and arranging data with useful knowledge, to assist in decision-making and methods, encompassing various strategies, and is used in different fields of business, research, and social science.

3 Jobs Available
Underwriter

An underwriter is a person who assesses and evaluates the risk of insurance in his or her field like mortgage, loan, health policy, investment, and so on and so forth. The underwriter career path does involve risks as analysing the risks means finding out if there is a way for the insurance underwriter jobs to recover the money from its clients. If the risk turns out to be too much for the company then in the future it is an underwriter who will be held accountable for it. Therefore, one must carry out his or her job with a lot of attention and diligence.

3 Jobs Available
Finance Executive
3 Jobs Available
Product Manager

A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.  

3 Jobs Available
Operations Manager

Individuals in the operations manager jobs are responsible for ensuring the efficiency of each department to acquire its optimal goal. They plan the use of resources and distribution of materials. The operations manager's job description includes managing budgets, negotiating contracts, and performing administrative tasks.

3 Jobs Available
Stock Analyst

Individuals who opt for a career as a stock analyst examine the company's investments makes decisions and keep track of financial securities. The nature of such investments will differ from one business to the next. Individuals in the stock analyst career use data mining to forecast a company's profits and revenues, advise clients on whether to buy or sell, participate in seminars, and discussing financial matters with executives and evaluate annual reports.

2 Jobs Available
Researcher

A Researcher is a professional who is responsible for collecting data and information by reviewing the literature and conducting experiments and surveys. He or she uses various methodological processes to provide accurate data and information that is utilised by academicians and other industry professionals. Here, we will discuss what is a researcher, the researcher's salary, types of researchers.

2 Jobs Available
Welding Engineer

Welding Engineer Job Description: A Welding Engineer work involves managing welding projects and supervising welding teams. He or she is responsible for reviewing welding procedures, processes and documentation. A career as Welding Engineer involves conducting failure analyses and causes on welding issues. 

5 Jobs Available
Transportation Planner

A career as Transportation Planner requires technical application of science and technology in engineering, particularly the concepts, equipment and technologies involved in the production of products and services. In fields like land use, infrastructure review, ecological standards and street design, he or she considers issues of health, environment and performance. A Transportation Planner assigns resources for implementing and designing programmes. He or she is responsible for assessing needs, preparing plans and forecasts and compliance with regulations.

3 Jobs Available
Environmental Engineer

Individuals who opt for a career as an environmental engineer are construction professionals who utilise the skills and knowledge of biology, soil science, chemistry and the concept of engineering to design and develop projects that serve as solutions to various environmental problems. 

2 Jobs Available
Safety Manager

A Safety Manager is a professional responsible for employee’s safety at work. He or she plans, implements and oversees the company’s employee safety. A Safety Manager ensures compliance and adherence to Occupational Health and Safety (OHS) guidelines.

2 Jobs Available
Conservation Architect

A Conservation Architect is a professional responsible for conserving and restoring buildings or monuments having a historic value. He or she applies techniques to document and stabilise the object’s state without any further damage. A Conservation Architect restores the monuments and heritage buildings to bring them back to their original state.

2 Jobs Available
Structural Engineer

A Structural Engineer designs buildings, bridges, and other related structures. He or she analyzes the structures and makes sure the structures are strong enough to be used by the people. A career as a Structural Engineer requires working in the construction process. It comes under the civil engineering discipline. A Structure Engineer creates structural models with the help of computer-aided design software. 

2 Jobs Available
Highway Engineer

Highway Engineer Job Description: A Highway Engineer is a civil engineer who specialises in planning and building thousands of miles of roads that support connectivity and allow transportation across the country. He or she ensures that traffic management schemes are effectively planned concerning economic sustainability and successful implementation.

2 Jobs Available
Field Surveyor

Are you searching for a Field Surveyor Job Description? A Field Surveyor is a professional responsible for conducting field surveys for various places or geographical conditions. He or she collects the required data and information as per the instructions given by senior officials. 

2 Jobs Available
Orthotist and Prosthetist

Orthotists and Prosthetists are professionals who provide aid to patients with disabilities. They fix them to artificial limbs (prosthetics) and help them to regain stability. There are times when people lose their limbs in an accident. In some other occasions, they are born without a limb or orthopaedic impairment. Orthotists and prosthetists play a crucial role in their lives with fixing them to assistive devices and provide mobility.

6 Jobs Available
Pathologist

A career in pathology in India is filled with several responsibilities as it is a medical branch and affects human lives. The demand for pathologists has been increasing over the past few years as people are getting more aware of different diseases. Not only that, but an increase in population and lifestyle changes have also contributed to the increase in a pathologist’s demand. The pathology careers provide an extremely huge number of opportunities and if you want to be a part of the medical field you can consider being a pathologist. If you want to know more about a career in pathology in India then continue reading this article.

5 Jobs Available
Veterinary Doctor
5 Jobs Available
Speech Therapist
4 Jobs Available
Gynaecologist

Gynaecology can be defined as the study of the female body. The job outlook for gynaecology is excellent since there is evergreen demand for one because of their responsibility of dealing with not only women’s health but also fertility and pregnancy issues. Although most women prefer to have a women obstetrician gynaecologist as their doctor, men also explore a career as a gynaecologist and there are ample amounts of male doctors in the field who are gynaecologists and aid women during delivery and childbirth. 

4 Jobs Available
Audiologist

The audiologist career involves audiology professionals who are responsible to treat hearing loss and proactively preventing the relevant damage. Individuals who opt for a career as an audiologist use various testing strategies with the aim to determine if someone has a normal sensitivity to sounds or not. After the identification of hearing loss, a hearing doctor is required to determine which sections of the hearing are affected, to what extent they are affected, and where the wound causing the hearing loss is found. As soon as the hearing loss is identified, the patients are provided with recommendations for interventions and rehabilitation such as hearing aids, cochlear implants, and appropriate medical referrals. While audiology is a branch of science that studies and researches hearing, balance, and related disorders.

3 Jobs Available
Oncologist

An oncologist is a specialised doctor responsible for providing medical care to patients diagnosed with cancer. He or she uses several therapies to control the cancer and its effect on the human body such as chemotherapy, immunotherapy, radiation therapy and biopsy. An oncologist designs a treatment plan based on a pathology report after diagnosing the type of cancer and where it is spreading inside the body.

3 Jobs Available
Anatomist

Are you searching for an ‘Anatomist job description’? An Anatomist is a research professional who applies the laws of biological science to determine the ability of bodies of various living organisms including animals and humans to regenerate the damaged or destroyed organs. If you want to know what does an anatomist do, then read the entire article, where we will answer all your questions.

2 Jobs Available
Actor

For an individual who opts for a career as an actor, the primary responsibility is to completely speak to the character he or she is playing and to persuade the crowd that the character is genuine by connecting with them and bringing them into the story. This applies to significant roles and littler parts, as all roles join to make an effective creation. Here in this article, we will discuss how to become an actor in India, actor exams, actor salary in India, and actor jobs. 

4 Jobs Available
Acrobat

Individuals who opt for a career as acrobats create and direct original routines for themselves, in addition to developing interpretations of existing routines. The work of circus acrobats can be seen in a variety of performance settings, including circus, reality shows, sports events like the Olympics, movies and commercials. Individuals who opt for a career as acrobats must be prepared to face rejections and intermittent periods of work. The creativity of acrobats may extend to other aspects of the performance. For example, acrobats in the circus may work with gym trainers, celebrities or collaborate with other professionals to enhance such performance elements as costume and or maybe at the teaching end of the career.

3 Jobs Available
Video Game Designer

Career as a video game designer is filled with excitement as well as responsibilities. A video game designer is someone who is involved in the process of creating a game from day one. He or she is responsible for fulfilling duties like designing the character of the game, the several levels involved, plot, art and similar other elements. Individuals who opt for a career as a video game designer may also write the codes for the game using different programming languages.

Depending on the video game designer job description and experience they may also have to lead a team and do the early testing of the game in order to suggest changes and find loopholes.

3 Jobs Available
Radio Jockey

Radio Jockey is an exciting, promising career and a great challenge for music lovers. If you are really interested in a career as radio jockey, then it is very important for an RJ to have an automatic, fun, and friendly personality. If you want to get a job done in this field, a strong command of the language and a good voice are always good things. Apart from this, in order to be a good radio jockey, you will also listen to good radio jockeys so that you can understand their style and later make your own by practicing.

A career as radio jockey has a lot to offer to deserving candidates. If you want to know more about a career as radio jockey, and how to become a radio jockey then continue reading the article.

3 Jobs Available
Choreographer

The word “choreography" actually comes from Greek words that mean “dance writing." Individuals who opt for a career as a choreographer create and direct original dances, in addition to developing interpretations of existing dances. A Choreographer dances and utilises his or her creativity in other aspects of dance performance. For example, he or she may work with the music director to select music or collaborate with other famous choreographers to enhance such performance elements as lighting, costume and set design.

2 Jobs Available
Social Media Manager

A career as social media manager involves implementing the company’s or brand’s marketing plan across all social media channels. Social media managers help in building or improving a brand’s or a company’s website traffic, build brand awareness, create and implement marketing and brand strategy. Social media managers are key to important social communication as well.

2 Jobs Available
Photographer

Photography is considered both a science and an art, an artistic means of expression in which the camera replaces the pen. In a career as a photographer, an individual is hired to capture the moments of public and private events, such as press conferences or weddings, or may also work inside a studio, where people go to get their picture clicked. Photography is divided into many streams each generating numerous career opportunities in photography. With the boom in advertising, media, and the fashion industry, photography has emerged as a lucrative and thrilling career option for many Indian youths.

2 Jobs Available
Producer

An individual who is pursuing a career as a producer is responsible for managing the business aspects of production. They are involved in each aspect of production from its inception to deception. Famous movie producers review the script, recommend changes and visualise the story. 

They are responsible for overseeing the finance involved in the project and distributing the film for broadcasting on various platforms. A career as a producer is quite fulfilling as well as exhaustive in terms of playing different roles in order for a production to be successful. Famous movie producers are responsible for hiring creative and technical personnel on contract basis.

2 Jobs Available
Copy Writer

In a career as a copywriter, one has to consult with the client and understand the brief well. A career as a copywriter has a lot to offer to deserving candidates. Several new mediums of advertising are opening therefore making it a lucrative career choice. Students can pursue various copywriter courses such as Journalism, Advertising, Marketing Management. Here, we have discussed how to become a freelance copywriter, copywriter career path, how to become a copywriter in India, and copywriting career outlook. 

5 Jobs Available
Vlogger

In a career as a vlogger, one generally works for himself or herself. However, once an individual has gained viewership there are several brands and companies that approach them for paid collaboration. It is one of those fields where an individual can earn well while following his or her passion. 

Ever since internet costs got reduced the viewership for these types of content has increased on a large scale. Therefore, a career as a vlogger has a lot to offer. If you want to know more about the Vlogger eligibility, roles and responsibilities then continue reading the article. 

3 Jobs Available
Publisher

For publishing books, newspapers, magazines and digital material, editorial and commercial strategies are set by publishers. Individuals in publishing career paths make choices about the markets their businesses will reach and the type of content that their audience will be served. Individuals in book publisher careers collaborate with editorial staff, designers, authors, and freelance contributors who develop and manage the creation of content.

3 Jobs Available
Journalist

Careers in journalism are filled with excitement as well as responsibilities. One cannot afford to miss out on the details. As it is the small details that provide insights into a story. Depending on those insights a journalist goes about writing a news article. A journalism career can be stressful at times but if you are someone who is passionate about it then it is the right choice for you. If you want to know more about the media field and journalist career then continue reading this article.

3 Jobs Available
Editor

Individuals in the editor career path is an unsung hero of the news industry who polishes the language of the news stories provided by stringers, reporters, copywriters and content writers and also news agencies. Individuals who opt for a career as an editor make it more persuasive, concise and clear for readers. In this article, we will discuss the details of the editor's career path such as how to become an editor in India, editor salary in India and editor skills and qualities.

3 Jobs Available
Reporter

Individuals who opt for a career as a reporter may often be at work on national holidays and festivities. He or she pitches various story ideas and covers news stories in risky situations. Students can pursue a BMC (Bachelor of Mass Communication), B.M.M. (Bachelor of Mass Media), or MAJMC (MA in Journalism and Mass Communication) to become a reporter. While we sit at home reporters travel to locations to collect information that carries a news value.  

2 Jobs Available
Corporate Executive

Are you searching for a Corporate Executive job description? A Corporate Executive role comes with administrative duties. He or she provides support to the leadership of the organisation. A Corporate Executive fulfils the business purpose and ensures its financial stability. In this article, we are going to discuss how to become corporate executive.

2 Jobs Available
Multimedia Specialist

A multimedia specialist is a media professional who creates, audio, videos, graphic image files, computer animations for multimedia applications. He or she is responsible for planning, producing, and maintaining websites and applications. 

2 Jobs Available
Welding Engineer

Welding Engineer Job Description: A Welding Engineer work involves managing welding projects and supervising welding teams. He or she is responsible for reviewing welding procedures, processes and documentation. A career as Welding Engineer involves conducting failure analyses and causes on welding issues. 

5 Jobs Available
QA Manager
4 Jobs Available
Quality Controller

A quality controller plays a crucial role in an organisation. He or she is responsible for performing quality checks on manufactured products. He or she identifies the defects in a product and rejects the product. 

A quality controller records detailed information about products with defects and sends it to the supervisor or plant manager to take necessary actions to improve the production process.

3 Jobs Available
Production Manager
3 Jobs Available
Product Manager

A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.  

3 Jobs Available
QA Lead

A QA Lead is in charge of the QA Team. The role of QA Lead comes with the responsibility of assessing services and products in order to determine that he or she meets the quality standards. He or she develops, implements and manages test plans. 

2 Jobs Available
Structural Engineer

A Structural Engineer designs buildings, bridges, and other related structures. He or she analyzes the structures and makes sure the structures are strong enough to be used by the people. A career as a Structural Engineer requires working in the construction process. It comes under the civil engineering discipline. A Structure Engineer creates structural models with the help of computer-aided design software. 

2 Jobs Available
Process Development Engineer

The Process Development Engineers design, implement, manufacture, mine, and other production systems using technical knowledge and expertise in the industry. They use computer modeling software to test technologies and machinery. An individual who is opting career as Process Development Engineer is responsible for developing cost-effective and efficient processes. They also monitor the production process and ensure it functions smoothly and efficiently.

2 Jobs Available
QA Manager
4 Jobs Available
AWS Solution Architect

An AWS Solution Architect is someone who specializes in developing and implementing cloud computing systems. He or she has a good understanding of the various aspects of cloud computing and can confidently deploy and manage their systems. He or she troubleshoots the issues and evaluates the risk from the third party. 

4 Jobs Available
Azure Administrator

An Azure Administrator is a professional responsible for implementing, monitoring, and maintaining Azure Solutions. He or she manages cloud infrastructure service instances and various cloud servers as well as sets up public and private cloud systems. 

4 Jobs Available
Computer Programmer

Careers in computer programming primarily refer to the systematic act of writing code and moreover include wider computer science areas. The word 'programmer' or 'coder' has entered into practice with the growing number of newly self-taught tech enthusiasts. Computer programming careers involve the use of designs created by software developers and engineers and transforming them into commands that can be implemented by computers. These commands result in regular usage of social media sites, word-processing applications and browsers.

3 Jobs Available
Product Manager

A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.  

3 Jobs Available
Information Security Manager

Individuals in the information security manager career path involves in overseeing and controlling all aspects of computer security. The IT security manager job description includes planning and carrying out security measures to protect the business data and information from corruption, theft, unauthorised access, and deliberate attack 

3 Jobs Available
ITSM Manager
3 Jobs Available
Automation Test Engineer

An Automation Test Engineer job involves executing automated test scripts. He or she identifies the project’s problems and troubleshoots them. The role involves documenting the defect using management tools. He or she works with the application team in order to resolve any issues arising during the testing process. 

2 Jobs Available
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