NCERT Solutions for Class 9 Science Chapter 12 Sound

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# NCERT Solutions for Class 9 Science Chapter 12 Sound

Edited By Vishal kumar | Updated on Sep 04, 2023 07:37 PM IST

## NCERT Solutions Class 9 Science Chapter 12 – Free PDF Download

NCERT Solutions for Class 9 Science Chapter 12 Sound: Solution of Class 9 Sound is an important chapter in the NCERT syllabus, which is a part of the NCERT Solutions for Class 9 Science. Every day we hear a different variety of sounds. Do you know how these sounds are produced? Along with the answer to this question, NCERT solutions for Class 9 Science Chapter 12 Sound will give you the answer to all the exercise questions mentioned in the chapter along with additional exercises. So, the answer to the question of how these sounds are produced is, that it is produced due to the vibration of the object and the vibration is transferred to nearby matters in the medium and it is transferred by successive compression rarefaction and compression and finally, it reaches our ear.

Solutions for NCERT Class 9 Science Chapter 12 Sound contains step-by-step answers to each question. The detailed class 9 science chapter 12 question answer to all the exercise questions provided here will help you to understand the fundamental concepts involved in chapter 12 Sound. Through this article, you will also get to know that the necessary condition for sound to travel is it requires a medium. Sound cannot travel in a vacuum. The speed of sound, wavelength, and frequency are related as V=λf, where v is the speed of sound, λ is the wavelength, and f is the frequency. The pitch of a sound is determined by its frequency and loudness is determined by the amplitude.

### NCERT Solutions for Class 9 Science: Important Formulas and Diagrams + eBook link

• The speed of sound in a medium is given by:
v = f λ
where v is the speed of sound, f is the frequency of the sound wave, and λ is the wavelength of the sound wave.

• The time period of a sound wave is given by:
T = 1/f
where T is the time period and f is the frequency.

• The loudness of a sound is measured in decibels (dB). The formula for calculating the loudness in decibels is given by:
L = 10 log(I/I₀) where L is the loudness in decibels, I is the intensity of the sound wave, and I₀ is the reference intensity (10^(-12) W/m²).

• The intensity of a sound wave is given by:
I = P/A
where I is the intensity of the sound wave, P is the power of the sound wave, and A is the area over which the sound wave is spread.

These are some of the important formulas related to class 9 science chapter 12 exercise question answer Sound that students should know to understand the concepts related to sound. Students can also download the chapterwise important formula in the form of a pdf by clicking on the below link to solve all the exercise questions of NCERT class 9 science.

### NCERT Solutions for Class 9 Science Chapter 12 Sound - Important Topics

important topic of sound class 9 questions and answers are given below:

Production of Sound:

• Vibrations and their types
• Production of sound by vibrating bodies
• Sound needs a medium to travel
• Propagation of sound

Sound Waves:

• Longitudinal waves
• Characteristics of sound waves (amplitude, wavelength, frequency, time period)
• The speed of sound in different media
• Reflection of Sound:

Reflection of sound waves

• Echoes and their formation
• Reverberation and its prevention
• Applications of reflection of sound (sonar, megaphone, stethoscope)

Range of Hearing:

• Audible and inaudible sounds
• Range of human hearing

Structure of the Human Ear:

• External ear, middle ear, and inner ear
• Working of the human ear
• Hearing impairment and its prevention
• Some Natural Phenomena Due to Sound:

Noise pollution and its effects

• Noise pollution and its control measures

These are the important topics covered in NCERT Solutions for Class 9 Science Chapter 12 Sound.

This chapter has been renumbered as Chapter 11 in accordance with the CBSE Syllabus 2023–24.

## NCERT solutions for class 9 science chapter 12 Sound: Solved In-text Questions-

Topic 12.1 Production of Sound

Objects when vibrating, produce vibration to the neighboring particles of the medium. These vibrating particle forces the adjacent particles to vibrate.

This way vibrations are produced by an object is transferred from one particle to the other till the vibration reaches our ear.

NCERT Free Solutions for Class 9 Science Chapter 12 Sound

Topic 12.2 Propagation of Sound

When the school bell vibrates, it pushes the adjacent particles of air to vibrate. This causes the disturbance in the wave when the bell moves forward it pushes the air particles in front of it and creates a region of high pressure known as compression and when the bell moves backward, it creates a region of low pressure known as rarefaction.

The continuous forward and backward movement of the bell produces a series of compression and rarefaction. This makes the sound of a bell to propagate through the air.

The sound waves are mechanical waves because they need a material medium to propagate.

No, we cannot hear any sound on the Moon because Moon does not have an atmosphere and sound needs a medium for propagation.

NCERT Textbook Solutions for Class 9 Science Chapter 12 Sound

Topic 12.2.2 Sound waves are Longitudinal Waves

(a) The loudness of a sound depends on its amplitude. Higher the amplitude, the sound produced will also be loud.

(b) The pitch of a sound is determined by its frequency. If the frequency of sound is high then, the sound produced will be high pitched.

The guitar has higher pitch since, the frequency of the wave determines pitch, i.e., higher the frequency of a wave, more, is its pitch.

The frequency of vibration of the particle is more in case of the guitar than the car horn.

Hence, the guitar will produce a higher pitch than the car horn.

NCERT Solutions for Class 9 Science Chapter 12 Sound

Topic 12.2.3 Characteristics of a sound

The wavelength of the sound wave is the distance between the two consecutive compressions or rarefactions. The SI unit is a meter (m).

Frequency is the number of complete oscillations per second and it is measured in Hertz (Hz).

Time period: is the time taken to complete one complete oscillation. It is measured in seconds.

Amplitude: is the maximum height reached by the crest or trough of a sound wave.

Velocity, frequency, and wavelength are related to each other as follows:

$Velocity(v) = Wavelength(\lambda)\times Frequency(\nu)$

$v = \lambda\times \nu$

Above equation is known as the wave equation and applicable to all types of wave.

Given a sound wave whose frequency is $220Hz$ and speed is $440\ m/s$ , then its wavelength will be:

As velocity is given by,

$v = \lambda\times \nu$

Then $\lambda = \frac{v}{\nu}$

Or, $\lambda = \frac{440\ m/s}{220\ Hz} = 2\ m$ .

Thus, the wavelength of the given sound wave is 2m.

Given,

The frequency of the sound wave, $f = 500Hz$ .

Hence, the time period,

$T = \frac{1}{f} = \frac{1}{500Hz} = 0.002\ s$

Therefore, the time interval between successive compressions from the source of sound is equal to the time period of sound waves.

CBSE NCERT Solutions for Class 9 Science Chapter 12 Sound

Topic 12.2.3 Characteristics of a sound

The Intensity of sound is defined as the sound power per unit area in a direction perpendicular to that area. The SI unit of intensity is the watt per square meter $(W/m^2)$ .

The loudness of sound refers to how loud or soft a sound seems to a listener and is determined by the intensity or the amount of energy. The unit of intensity is the decibel (dB).

Higher the decibel level sound waves have greater intensity and sounds are louder.

Free NCERT Solutions for Class 9 Science Chapter 12 Sound

Topic 12.2.4 Speed of sound in different media

The speed of the sound depends on the nature of the medium. The speed of sound is fastest in the case of solids and decreases further in liquids followed by gases.

Therefore, in iron, the speed of sound is the fastest at a given temperature.

Sound Class 9 Science Chapter 12 Topic 12.3 Reflection of Sound

Given the speed of sound is $342\: m\: s^{-1}$ .

The time taken by the sound to travel from the source to the reflecting surface will be half of this time:

$= \frac{3}{2} seconds$

Hence,

$Distance = Speed\times Time$

Substituting the values in the equation, we get the distance,

$Distance = 342\ m/s\times 1.5s = 513\ m$

NCERT Class 9 Science Chapter 12 Sound

Topic 12.3.3 Uses of multiple reflections of sound

The sound after reflection reaches every corner of the concert hall and the audience can hear properly and clearly.

NCERT Textbook Solutions for Class 9 Science Chapter 12 Sound

Topic 12.4 Range of Hearing

The audible range of an average human ear lies between frequency 20Hz to 20,000Hz.

Humans cannot hear sounds of frequency having above or below this range.

• Infrasound?

The infrasonic sounds lie below 20 Hertz frequency which is inaudible for human ears.

• Ultrasound?

The ultrasonic sounds have frequencies higher than 20,000 Hertz, which is also not audible for humans.

CBSE NCERT Solutions for Class 9 Science Chapter 12 Sound

Topic 12.5.1 Sonar

Given,

The time taken by the SONAR pulse to go from the submarine to cliff will be half of this time:

$= \frac{1.02}{2} = 0.51\ second.$

And we know that, $Distance = Speed \times Time$

Substituting the values in the above equation, we obtain

$Distance = 1531\ m/s \times 0.51s = 780.8\ m$

## Sound Class 9 NCERT Chapter 9: Solved Excercise Questions

A sound is a form of energy that is produced by the vibrations of objects.

It is produced by the to and fro motion of the object. The vibrations are created which causes a disturbance in the adjacent particles of the medium. The disturbance travels in the waveform and creates sound.

The compression and rarefactions produced in air near the source of sound (Here the prong) are shown in the diagram below:

Here C is for Compression and R is for Rarefaction.

Bell jar experiment showing sound cannot travel in a vacuum :

Take an electric bell and an airtight glass bell jar. The electric bell is suspended inside the airtight bell jar. The bell jar is connected to a vacuum pump. If you press the switch you will be able to hear the bell. Now start the vacuum pump. When the air in the jar is pumped out gradually, the sound becomes fainter, although the same current is passing through the bell. After some time when less air is left inside the bell jar, you will hear a very feeble sound. And finally, when there is no air present inside the jar, there is no sound detectable.

This proves sound needs a material medium to propagate and cannot propagate through the vacuum.

longitudinal waves are formed When oscillation is created parallel to the disturbance of the particles of the medium in the direction of propagation and since the sound waves also create oscillations in the particles of the medium parallel to the disturbance in the direction of propagation.

Therefore, sound waves are called a longitudinal wave .

The quality of timber of the sound is that characteristic which enables us to distinguish one sound from another having the same pitch and loudness.

Thus, because of the difference in timbre and pitch of the sound wave, we can identify the voices of friends.

This happens because of the difference in the velocities of light and sound waves. Light travels much faster than the sound. That is the reason why we hear the thunder a few seconds after the flash of thunder is seen instead of both are produced simultaneously.

$344 \: m \: s^{-1}$ .

Taking the speed of the sound in air as $344\ m/s.$

Then,

we know: $Speed = Wavelength\times Frequency$

Or, $v = \lambda \times \nu$

Hence,

For $\nu =20\ Hz$ ,

$\lambda_{1} = \frac{v}{\nu_{1}} = \frac{344}{20} = 17.2\ m$

and for $\nu =20,000\ Hz$

$\lambda_{2} = \frac{v}{\nu_{2}} = \frac{344}{20,000} = 0.0172\ m$

Hence, the hearing wavelength range for humans is $0.0172m\ to\ 17.2m$ .

(Given: Speed of sound in air is $346\ m/s$ ; Speed of sound in aluminium is $6240\ m/s$ )

Here, let us assume the length of the rod be $'l'$ .

Then,

Time taken by the sound wave in air:

$\left ( Given: v_{air} = 346\ m/s \right )$

$Time = \frac{Distance}{Speed}$

$t_{air} = \frac{l}{346} seconds$

Time taken by the sound wave in Aluminium to reach from one end to the other end,

$\left ( Given: v_{aluminium} = 6420\ m/s \right )$

$t_{aluminium} = \frac{l}{6420} seconds$

Therefore, the ratio of the time taken by the sound wave in air and in aluminium will be:

$\frac{t_{air}}{t_{aluminium}} = \frac{\frac{l}{346}}{\frac{l}{6420}} = \frac{6420}{346} = \frac{18.55}{1}$

Hence, the ratio is $18.55:1$ .

Given the frequency of the sound wave is 100Hz.

Frequency is the number of oscillations per second.

So, 100Hz means that 100 oscillations are done in 1 second.

Thus, in a minute, the number of oscillations would be,

$= 100\times60 = 6000$

Yes, the sound wave also follows the same laws of reflection as light does. Which are as follows:

(i) The angle of incidence of the sound wave and the angle of reflection of the sound wave to the normal is equal.

(ii) The incident sound wave, the reflected sound wave and the normal at the point of incidence, all lie in the same plane.

Listening to the sound of echo depends upon the time interval between the source of a sound and the reflecting sound which should be at least 0.1 seconds.

The speed of the sound increases with an increase in the temperature of the medium. Hence, on a hotter day, the time interval between the source sound and the reflected sound will decrease.

Therefore, we cannot listen to the echo unless the interval is greater than 0.1 seconds.

Two practical applications of sound waves are :

(i) In stethoscope, the sound of the patient's heartbeat reaches the doctor's ears by multiple reflections throughout the pipe of the stethoscope of sound.

(ii) Horns, megaphones or loudhailers are designed to send sound in a particular direction without spreading it in all directions. There is a conical opening which reflects the sound waves and guides most of the sound waves from the source.

$g=10\: m\: s^{-2}$ and speed of sound = $340\: m\: s^{-1}$ .

Given the height of the tower, $s =500\ m$ ,

and the velocity of the sound, $v = 340\ m/s$ ,

Acceleration due to gravity, $g = 10\ ms^{-2}$

Let the initial velocity of the stone, $u = 0$ , as the stone is initially at rest.

Let the time taken by the stone to fall to the base of the tower be $t_{1}$

Now, according to the IInd Equation of Motion:

$s = ut_{1}+\frac{1}{2}gt_{1}^2$

$500 = 0\times t_{1}+\frac{1}{2}\times10\times t_{1}^2$

$t_{1}^2 = 100$

$t_{1} = 10 sec$ .

Now, the time taken by the sound to reach the top from the base of the tower,

$t_{2} = \frac{500}{340}sec =1.47sec$

Therefore, the splash is heard at the top after time, $t$

Calculating $t = t_{1}+t_{2} = 10+1.47 = 11.47sec.$

Given,

The speed with which sound travels is $339\: m\: s^{-1}$ .

and the wavelength is 1.5 cm.

Then we know the relation,

$v= \lambda \times \nu$

Where, $v$ is velocity, $\lambda$ is the wavelength, and $\nu$ is the frequency of the wave.

Hence,

$\nu = \frac{v}{\lambda} = \frac{339\ m/s}{0.015m} = 22600Hz.$

Calculated frequency is out of audible range of human ears which is $20Hz\ to \ 20,000Hz.$

Therefore, it is inaudible.

Reverberation is the repeated reflection after the source stops producing a sound which is also known as persistence of sound. When the wave reaches the wall of a room, it is partly reflected back from the wall. This reflected sound then reaches the other wall and again gets reflected partly. Due to this, sound can be heard even after the source has ceased to produce sound.

To reduce the reverberation, sound must have to be absorbed as it reaches the walls and the ceilings of a room. Materials like wood, fibreboard, rough plastic, heavy curtains, and some seats can be used to reduce the reverberations.

Loudness is a physiological response of the ear to the intensity of sound which enables us to distinguish between a soft sound and a loud sound.

The loudness or softness of a sound is determined basically by its amplitude and loudness is proportional to the square of the amplitude of the vibrations.

Where greater the amplitude of vibrations, the louder the sound is produced.

Bats emits very high frequencies sounds from their mouth which when touches the prey, and gets reflected back to the bat. Then the bat detects these waves and estimates the distance and the direction of the prey.

The object to be cleaned is first put in the cleaning solution and then the ultrasonic waves are passed through that solution. The high-frequency ultrasonic waves are capable to remove the dirt from the objects very easily.

Working of SONOR:

Sonar consists of a transmitter and a detector and is installed in a boat or a ship, as shown in Figure below:

The transmitter produces and transmits ultrasonic waves. These waves travel through water and after striking the object on the seabed, get reflected back and are sensed by the detector. The detector converts the ultrasonic waves into electrical signals which are appropriately interpreted. The distance of the object that reflected the sound wave can be calculated by knowing the speed of sound in water and the time interval between the transmission and reception of the ultrasound.

Applications of SONOR:

The sonar technique is used to determine the depth of the sea and to locate underwater hills, valleys, submarine, icebergs, sunken ship etc.

Given the distance of the object is 3625 m from the submarine and the time taken is 5 seconds.

But the time gave includes of both journey downward and upward,

hence the time taken will be half of this time.

$t = \frac{5}{2}sec$

And as $Speed = \frac{Distance}{Time}$

Putting the values in the equation, we get

$Speed = \frac{3625}{\frac{5}{2} } = 1450\ m/s$

Therefore, the speed of sound is 1450 m/s.

Ultrasounds can be used to detect cracks and flaws in metal blocks. Metallic components are generally used in the construction of big structures like buildings, bridges, machines and also scientific equipment. The cracks or holes inside the metal blocks, which are invisible from outside reduces the strength of the structure. Ultrasonic waves are allowed to pass through the metal block and detectors are used to detect the transmitted waves. If there is even a small defect, the ultrasound gets reflected back indicating the presence of the flaw or defect, as shown

The outer ear is called ‘pinna’. It collects the sound from the surroundings. The collected sound passes through the auditory canal. At the end of the auditory canal, there is a thin membrane called the eardrum or tympanic membrane. When compression of the medium reaches the eardrum the pressure on the outside of the membrane increases and forces the eardrum inward. Similarly, the eardrum moves outward when a rarefaction reaches it. In this way, the eardrum vibrates. The vibrations are amplified several times by three bones (the hammer, anvil, and stirrup) in the middle ear. The middle ear transmits the amplified pressure variations received from the sound wave to the inner ear. In the inner ear, the pressure variations are turned into electrical signals by the cochlea. These electrical signals are sent to the brain via the auditory nerve, and the brain interprets them as sound.

The solutions for the sound chapter class 9 have been prepared by highly qualified subject matter experts of Careers360 in a systematic manner. The solutions are presented topic-wise, covering topics such as Production of Sound, Propagation of Sound, and the fact that sound waves are Longitudinal Waves, among others. In addition to the topic-wise coverage, the solutions of chapter 12 science class 9 also include solved exercise questions. Students can download the solutions in the form of a PDF and use them according to their convenience.

## Class 9th science chapter 12 question answer

This chapter carries a weightage of 27 marks in the examination. Questions may be posed on various topics, so it's essential for students to be thoroughly prepared. Detailed questions, particularly concerning the structure of the ear and sound reflection, are often included. Make sure to practice numerical problems extensively as well to excel in this class 9 chapter 12 science question answer.

## Important Topics of NCERT Class 9 Science Chapter 12 Sound:

Subtopics for chapter 12 science class 9th are given below:

12.1 Production of Sound

12.2 Propagation of Sound

12.2.1 Sound Needs a Medium to Travel

12.2.2 Sound Waves are Longitudinal Waves

12.2.3 Characteristics of a Sound Wave

12.3 Reflection of Sound

12.3.1 Echo

12.3.2 Reverberation

12.3.3 Uses of Multiple Reflections of Sound

12.4 Range of Hearing

12.5 Applications of Ultrasound

12.5.1 Sonar

12.6 Structure of Human Ear

## Key feathers of CBSE NCERT solutions for class 9 science chapter 12 Sound:

Comprehensive Preparation: The sound class 9 questions and answers provide comprehensive coverage of the chapter, ensuring that you have a thorough understanding of the topics covered. This helps you prepare effectively for your exams.

Clarification of Doubts: If you have any doubts while solving the class 9 science chapter 12 sound question answer, subject matter experts are available via chat support. They can provide clarifications and explanations to ensure that you understand the topics completely.

Improved Exam Performance: By using the NCERT for Class 9 Science Chapter 12 Sound you can enhance your exam performance. The solutions are designed to help you grasp the concepts effectively, which can lead to better scores in your exams.

Accuracy and Clarity: The class 9 science chapter 12 exercise question answer provided are accurate and reliable, as they are based on the NCERT textbook. They are written in a clear and concise manner, making it easier for you to understand the concepts and apply them in your exams.

Disclaimer:

We would like to inform you that certain topics have been dropped from class 9th science chapter 12 question answer. These excluded topics are as follows:

1. Box item titled 'Can sound make a light spot dance?'
2. Box item titled 'Sonic Boom'
3. Section 12.2.1 - 'Sound Needs a Medium - Travel'
4. Section 12.5.1 - 'Sonar'
5. Section 12.6 - 'Structure of the Human Ear'

Also Check NCERT Books and NCERT Syllabus here:

NCERT Solutions for Class 9 Science- Chapter Wise

 Chapter No. Chapter Name Chapter 1 Chapter 2 Chapter 3 Chapter 4 Chapter 5 Chapter 6 Chapter 7 Chapter 8 Chapter 9 Chapter 10 Chapter 11 Chapter 12 Sound Chapter 13 Chapter 14 Chapter 15

## NCERT Science Exemplar Solutions Class 9 - Chapter Wise

 Chapter No. Chapter Name Chapter 1 Chapter 1 Matter in our Surroundings Chapter 2 Chapter 2 Is Matter Around Us Pure? Chapter 3 Chapter 3 Atoms and Molecules Chapter 4 Chapter 4 Structure of the Atom Chapter 5 Chapter 5 The Fundamental Unit of Life Chapter 6 Chapter 6 Tissues Chapter 7 Chapter 7 Diversity in Living Organisms Chapter 8 Chapter 8 Motion Chapter 9 Chapter 9 Forces and Laws of Motion Chapter 10 Chapter 10 Gravitation Chapter 11 Chapter 11 Work and Energy Chapter 12 Chapter 12 Sound Chapter 13 Chapter 13 Why do We Fall ill? Chapter 14 Chapter 14 Natural Resources Chapter 15 Chapter 15 Improvement in Food Resources

After going through the class 9 science chapter 12 sound question answer, students will be able to solve questions related to this chapter in the exam. If you still have any confusion, please comment below, and our experts will assist you.

1. What are the features of NCERT Solutions for Class 9 Science Chapter 12 Sound?

Class 9 NCERT science chapter has 22 exercise questions, solutions of these questions are explained in the NCERT solutions of Sound Class 9 chapter. All the questions are according to the CBSE NCERT syllabus of Class 9.

2. Where can I find more questions on Class 9 NCERT chapter Sound?

More questions on NCERT Class 9 chapter Sound can be solved from NCERT Exemplar questions for Class 9

3. What is the speed of sound in air and water?

The speed of sound in air is approximately 343 m/s at a temperature of 20°C. The speed of sound in water is much higher, around 1,500 m/s. The speed of sound in a medium depends on the density and elasticity of the medium.

4. What is the difference between noise and music?

Noise is a random sound that has no specific pitch or rhythm, while music is a structured arrangement of sounds that have a specific pitch, rhythm, and melody.

5. Why should I use the NCERT Solutions for Class 9 Science Chapter 9 PDF from Careers360?

The NCERT Solutions for Class 9 Science Chapter 9 PDF from Careers360 are authored by subject matter experts, are easy to understand, comprehensive, and can improve exam preparation. They are accessible online and can be downloaded for convenience.

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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) Option 2) Option 3) Option 4)

A person trying to lose weight by burning fat lifts a mass of 10 kg upto a height of 1 m 1000 times.  Assume that the potential energy lost each time he lowers the mass is dissipated.  How much fat will he use up considering the work done only when the weight is lifted up ?  Fat supplies 3.8×107 J of energy per kg which is converted to mechanical energy with a 20% efficiency rate.  Take g = 9.8 ms−2 :

 Option 1) 2.45×10−3 kg Option 2)  6.45×10−3 kg Option 3)  9.89×10−3 kg Option 4) 12.89×10−3 kg

An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range

 Option 1) Option 2) Option 3) Option 4)

A particle is projected at 600   to the horizontal with a kinetic energy . The kinetic energy at the highest point

 Option 1) Option 2) Option 3) Option 4)

In the reaction,

 Option 1)   at STP  is produced for every mole   consumed Option 2)   is consumed for ever      produced Option 3) is produced regardless of temperature and pressure for every mole Al that reacts Option 4) at STP is produced for every mole Al that reacts .

How many moles of magnesium phosphate, will contain 0.25 mole of oxygen atoms?

 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 Option 4) 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.

Number of atoms in 558.5 gram Fe (at. wt.of Fe = 55.85 g mol-1) is

 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

 Option 1) less than 3 Option 2) 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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##### 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
##### 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
##### Bank Probationary Officer (PO)

A career as Bank Probationary Officer (PO) is seen as a promising career opportunity and a white-collar career. Each year aspirants take the Bank PO exam. This career provides plenty of career development and opportunities for a successful banking future. If you have more questions about a career as  Bank Probationary Officer (PO), what is probationary officer or how to become a Bank Probationary Officer (PO) then you can read the article and clear all your doubts.

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
##### 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
##### Finance Executive

A career as a Finance Executive requires one to be responsible for monitoring an organisation's income, investments and expenses to create and evaluate financial reports. His or her role involves performing audits, invoices, and budget preparations. He or she manages accounting activities, bank reconciliations, and payable and receivable accounts.

3 Jobs Available
##### Investment Banker

An Investment Banking career involves the invention and generation of capital for other organizations, governments, and other entities. Individuals who opt for a career as Investment Bankers are the head of a team dedicated to raising capital by issuing bonds. Investment bankers are termed as the experts who have their fingers on the pulse of the current financial and investing climate. Students can pursue various Investment Banker courses, such as Banking and Insurance, and Economics to opt for an Investment Banking career path.

3 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
##### Architect

Individuals in the architecture career are the building designers who plan the whole construction keeping the safety and requirements of the people. Individuals in architect career in India provides professional services for new constructions, alterations, renovations and several other activities. Individuals in architectural careers in India visit site locations to visualize their projects and prepare scaled drawings to submit to a client or employer as a design. Individuals in architecture careers also estimate build costs, materials needed, and the projected time frame to complete a build.

2 Jobs Available
##### Landscape Architect

Having a landscape architecture career, you are involved in site analysis, site inventory, land planning, planting design, grading, stormwater management, suitable design, and construction specification. Frederick Law Olmsted, the designer of Central Park in New York introduced the title “landscape architect”. The Australian Institute of Landscape Architects (AILA) proclaims that "Landscape Architects research, plan, design and advise on the stewardship, conservation and sustainability of development of the environment and spaces, both within and beyond the built environment". Therefore, individuals who opt for a career as a landscape architect are those who are educated and experienced in landscape architecture. Students need to pursue various landscape architecture degrees, such as M.Des, M.Plan to become landscape architects. If you have more questions regarding a career as a landscape architect or how to become a landscape architect then you can read the article to get your doubts cleared.

2 Jobs Available
##### Plumber

An expert in plumbing is aware of building regulations and safety standards and works to make sure these standards are upheld. Testing pipes for leakage using air pressure and other gauges, and also the ability to construct new pipe systems by cutting, fitting, measuring and threading pipes are some of the other more involved aspects of plumbing. Individuals in the plumber career path are self-employed or work for a small business employing less than ten people, though some might find working for larger entities or the government more desirable.

2 Jobs Available
##### Construction Manager

Individuals who opt for a career as construction managers have a senior-level management role offered in construction firms. Responsibilities in the construction management career path are assigning tasks to workers, inspecting their work, and coordinating with other professionals including architects, subcontractors, and building services engineers.

2 Jobs Available
##### Carpenter

Carpenters are typically construction workers. They stay involved in performing many types of construction activities. It includes cutting, fitting and assembling wood.  Carpenters may help in building constructions, bridges, big ships and boats. Here, in the article, we will discuss carpenter career path, carpenter salary, how to become a carpenter, carpenter job outlook.

2 Jobs Available
##### Welder

An individual who opts for a career as a welder is a professional tradesman who is skilled in creating a fusion between two metal pieces to join it together with the use of a manual or fully automatic welding machine in their welder career path. It is joined by intense heat and gas released between the metal pieces through the welding machine to permanently fix it.

2 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
##### 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
##### Veterinary Doctor

A veterinary doctor is a medical professional with a degree in veterinary science. The veterinary science qualification is the minimum requirement to become a veterinary doctor. There are numerous veterinary science courses offered by various institutes. He or she is employed at zoos to ensure they are provided with good health facilities and medical care to improve their life expectancy.

5 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
##### 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
##### 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
##### Surgical Technologist

When it comes to an operation theatre, there are several tasks that are to be carried out before as well as after the operation or surgery has taken place. Such tasks are not possible without surgical tech and surgical tech tools. A single surgeon cannot do it all alone. It’s like for a footballer he needs his team’s support to score a goal the same goes for a surgeon. It is here, when a surgical technologist comes into the picture. It is the job of a surgical technologist to prepare the operation theatre with all the required equipment before the surgery. Not only that, once an operation is done it is the job of the surgical technologist to clean all the equipment. One has to fulfil the minimum requirements of surgical tech qualifications.

3 Jobs Available
##### Maxillofacial Surgeon

A Maxillofacial Surgeon is a medical professional who performs facial surgeries that include tooth implant, neck, head or other surgeries such as removal of tumours, cosmetic surgeries and treatment of injuries on the face.

2 Jobs Available
##### Surgical Assistant

Surgical assistants are professionals in the service of saving others’ lives. They perform various medical procedures. In a career as a surgical assistant, one works in a team and contributes to the success of operations. Surgical assistants learn new procedures and update their knowledge of new medical technology and equipment. Surgical assistants clean and sterilize the tools used in surgery. In a career as a surgical assistant, individuals perform all the basic duties that allow surgeons to keep their focus on essential technical functions.

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
##### Talent Agent

The career as a Talent Agent is filled with responsibilities. A Talent Agent is someone who is involved in the pre-production process of the film. It is a very busy job for a Talent Agent but as and when an individual gains experience and progresses in the career he or she can have people assisting him or her in work. Depending on one’s responsibilities, number of clients and experience he or she may also have to lead a team and work with juniors under him or her in a talent agency. In order to know more about the job of a talent agent continue reading the article.

If you want to know more about talent agent meaning, how to become a Talent Agent, or Talent Agent job description then continue reading this article.

3 Jobs Available

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
##### Talent Director

Individuals who opt for a career as a talent director are professionals who work in the entertainment industry. He or she is responsible for finding out the right talent through auditions for films, theatre productions, or shows. A talented director possesses strong knowledge of computer software used in filmmaking, CGI and animation. A talent acquisition director keeps himself or herself updated on various technical aspects such as lighting, camera angles and shots.

2 Jobs Available
##### Videographer

Careers in videography are art that can be defined as a creative and interpretive process that culminates in the authorship of an original work of art rather than a simple recording of a simple event. It would be wrong to portrait it as a subcategory of photography, rather photography is one of the crafts used in videographer jobs in addition to technical skills like organization, management, interpretation, and image-manipulation techniques. Students pursue Visual Media, Film, Television, Digital Video Production to opt for a videographer career path. The visual impacts of a film are driven by the creative decisions taken in videography jobs. Individuals who opt for a career as a videographer are involved in the entire lifecycle of a film and production.

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
##### 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
##### 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
##### 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
##### 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 cost got reduced the viewership for these types of content has increased on a large scale. Therefore, the career as vlogger has a lot to offer. If you want to know more about the career as vlogger, how to become a vlogger, so on and so forth then continue reading the article. Students can visit Jamia Millia Islamia, Asian College of Journalism, Indian Institute of Mass Communication to pursue journalism degrees.

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
##### Fashion Journalist

Fashion journalism involves performing research and writing about the most recent fashion trends. Journalists obtain this knowledge by collaborating with stylists, conducting interviews with fashion designers, and attending fashion shows, photoshoots, and conferences. A fashion Journalist  job is to write copy for trade and advertisement journals, fashion magazines, newspapers, and online fashion forums about style and fashion.

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
##### 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
##### 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
##### 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

Production Manager Job Description: A Production Manager is responsible for ensuring smooth running of manufacturing processes in an efficient manner. He or she plans and organises production schedules. The role of Production Manager involves estimation, negotiation on budget and timescales with the clients and managers.

3 Jobs Available
##### QA Manager

Quality Assurance Manager Job Description: A QA Manager is an administrative professional responsible for overseeing the activity of the QA department and staff. It involves developing, implementing and maintaining a system that is qualified and reliable for testing to meet specifications of products of organisations as well as development processes.

2 Jobs Available

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
##### Reliability Engineer

Are you searching for a Reliability Engineer job description? A Reliability Engineer is responsible for ensuring long lasting and high quality products. He or she ensures that materials, manufacturing equipment, components and processes are error free. A Reliability Engineer role comes with the responsibility of minimising risks and effectiveness of processes and equipment.

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
##### 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
##### 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
##### ITSM Manager

ITSM Manager is a professional responsible for heading the ITSM (Information Technology Service Management) or (Information Technology Infrastructure Library) processes. He or she ensures that operation management provides appropriate resource levels for problem resolutions. The ITSM Manager oversees the level of prioritisation for the problems, critical incidents, planned as well as proactive tasks.

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
##### Big Data Analytics Engineer

Big Data Analytics Engineer Job Description: A Big Data Analytics Engineer is responsible for collecting data from various sources. He or she has to sort the organised and chaotic data to find out patterns. The role of Big Data Engineer involves converting messy information into useful data that is clean, accurate and actionable.

2 Jobs Available
##### Cloud Solution Developer

A Cloud Solutions Developer is basically a Software Engineer with specialisation in cloud computing. He or she possesses a solid understanding of cloud systems including their operations, deployment with security and efficiency with no little downtime.

2 Jobs Available
##### CRM Technology Consultant

A Customer Relationship Management Technology Consultant or CRM Technology Consultant is responsible for monitoring and providing strategy for performance improvement with logged calls, performance metrics and revenue metrics. His or her role involves accessing data for team meetings, goal setting analytics as well as reporting to executives.

2 Jobs Available
##### IT Manager

Career as IT Manager  requires managing the various aspects of an organization's information technology systems. He or she is responsible for increasing productivity and solving problems related to software and hardware. While this role is typically one of the lower-level positions within an organisation, it comes with responsibilities related to people and ownership of systems.

2 Jobs Available