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NCERT Exemplar Class 11 Physics Solutions Chapter 11 discusses heat, temperature, and their impacts on various materials. Why does metal seem colder than wood at the same temperature? Physics Chapter 11 explains the phenomena such as thermal expansion, heat transfer and specific heat capacity. It also helps us to relate everyday applications, such as why there are expansion gaps in bridges or how thermos flasks keep the liquids warm!
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NCERT Exemplar Class 11 Physics Solutions Chapter 11 helps the students to understand the difference between heat and temperature. It covers concepts such as thermal expansion heat capacity and laws such as Stefan's law and Newton's law of cooling. These solutions consist of elaborate descriptions and solution methods for improved exam preparation. It is crucial to grasp these topics in order to master thermal physics.
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Question:11.1
A bimetallic strip is made of aluminium and steel
a) remain straight
b) get twisted
c) will bend with aluminium on concave side
d) will bend with steel on concave side
Answer:
The answer is the option (d) Will bend with steel on concave side.Question:11.2
A uniform metallic rod rotates about its perpendicular bisector with constant angular speed. If it is heated uniformly to raise its temperature slightly
a) its speed of rotation increases
b) its speed of rotation decreases
c) its speed of rotation remains same
d) its speed increases because its moment of inertia increases
Answer:
When the rod is heated uniformly to raise its temperature slightly, the length of the rod will be increased due to heating. This leads to increase in its moment of inertia (I).Question:11.3
Answer:
The answer is the optionQuestion:11.4
An aluminium sphere is dipped into water. Which of the following is true?
a) buoyancy will be less in water at
b) buoyancy will be more in water at
c) buoyancy in water at
d) buoyancy may be more or less in water at
Answer:
We know that,Question:11.5
As the temperature is increased, the time period of a pendulum
a) increases as its effective length increases even though its centre of mass still remains at the centre of the bob
b) decreases as its effective length increases even though its centre of mass still remains at the centre of the bob
c) increases as its effective length increases due to shifting of centre of mass below the centre of the bob
d) decreases as its effective length remains same but the centre of mass shifts above the centre of the bob
Answer:
The answer is the option (a) increases as its effective length increases even though its centre of mass still remains at the centre of the bob.Question:11.6
Heat is associated with
a) kinetic energy of random motion of molecules
b) kinetic energy of orderly motion of molecules
c) total kinetic energy of random and orderly motion of molecules
d) kinetic energy of random motion in some cases and kinetic energy of orderly motion in other
Answer:
The answer is the option (a) kinetic energy of random motion of molecules.Question:11.7
Answer:
The answer is the optionQuestion:11.8
A sphere, a cube, and a thin circular plate, all of the same material and same mass are initially heated to same high temperature.
a) plate will cool fastest and cube the slowest
b) sphere will cool fastest and cube the slowest
c) plate will cool fastest and sphere the slowest
d) cube will cool fastest and plate the slowest
Answer:
The answer is the option (c) Plate will cool fastest and sphere the slowest.Question:11.9
Mark the correct options:
a) A system X is in thermal equilibrium with Y but not with Z. System Y and Z may be in thermal equilibrium with each other
b) A system X is in thermal equilibrium with Y but not with Z. Systems Y and Z are not in thermal equilibrium with each other
c) A system X is neither in thermal equilibrium with Y nor with Z. The systems Y and Z must be in thermal equilibrium with each other
d) A system X is neither in thermal equilibrium with Y nor with Z. The system Y and Z may be in thermal equilibrium with each other
Answer:
The answer is the option (b) A system X is in thermal equilibrium with Y but not with Z. System Y and Z are not in thermal equilibrium with each other and option (d) A system X is neither in thermal equilibrium with Y nor with Z. The system Y and Z may be in thermal equilibrium with each other.Question:11.10
Gulab Jamuns’ (assumed to be spherical) are to be heated in an oven. They are available in two sizes, one twice bigger than the other. Pizzas (assumed to be discs) are also to be heated in oven. They are also in two sizes, one twice big in radius than the other. All four are put together to be heated to oven temperature. Choose the correct option from the following:
a) both size gulab jamuns will get heated in the same time
b) smaller gulab jamuns are heated before bigger ones
c) smaller pizzas are heated before bigger ones
d) bigger pizzas are heated before smaller ones
Answer:
The answer is the option (b) Smaller gulab jamuns are heated before bigger ones and (c) Smaller pizzas are heated before bigger ones.Question:11.11
Refer to the plot of temperature versus time showing the changes in the state of ice on heating. Which of the following is correct?
a) the region AB represents ice and water in thermal equilibrium
b) at B water starts boiling
c) at C all the water gets converted into steam
d) C to D represents water and steam in equilibrium at boiling point
Answer:
The answer is the option (a) The region AB represents ice and water in thermal equilibrium and (d) C to D all represents water and steam in equilibrium at boiling point.Question:11.12
A glass full of hot milk is poured on the table. It begins to cool gradually. Which of the following is correct?
a) the rate of cooling is constant till milk attains the temperature of the surrounding
b) the temperature of milk falls off exponentially with time
c) while cooling, there is a flow of heat from milk to the surrounding as well as from surrounding to the milk but the net flow of heat is from milk to the surrounding and that is why it cools
d) all three phenomenon, conduction, convection, and radiation are responsible for the loss of heat from milk to the surroundings
Answer:
The answer is the option (b) The temperature of milk falls off exponentially with time, (c) While cooling, there is a flow of heat from milk to the surrounding as well as from surrounding to the milk but the net flow of heat is from milk to the surrounding and that is why it cools and (d) All three phenomenon, conduction, convection and radiation are responsible for the loss of heat from milk to the surroundings.
Explanation:
Question:11.13
If the first observation is correct, what can you say about observations 2, 3, and 4.Answer:
Here, it is given that there is a rod and a material that has linear expansion ‘Question:11.14
If the first observation is correct, what can you say about observations 2, 3, and 4.Answer:
Question:11.15
Answer:
The rate of transferring heat in metal is larger than that in wood, as the conductivity of the metal bar is extremely high as compared to the wood.Question:11.16
Calculate the temperature which has same numerical value on Celsius and Fahrenheit scale.
Answer:
Let us consider that the required temperature is,Question:11.17
Answer:
Copper base transfers heat quickly to food from the bottom and also needs a low quantity of heat as compared to steel because, as compared to steel, copper has higher conductivity and low specific heat. Thus, heat is supplied from burner to food in utensil quickly and in a large amount when the base is copper.Question:11.18
Answer:
Now, we know that moment of inertia (I) of a rod when its axis is along perpendicular bisector it is =Question:11.19
Answer:
From the P-T graph, we know that at decreasing pressure in the liquid state atQuestion:11.20
Answer:
Given: Mass of water = 100g
Ice mixes with water at
Now, the heat required by -
Thus, Q = 1000cal
Thus,
= 12.5 gm
Thus, there is 12.5 gm of water and ice in the mixture and hence its temperature remains
Question:11.21
Answer:
According to Newton’s law of cooling,Question:11.22
Answer:
We can use iron and brass to make the required scale. Here, one end will be connected with brass and the other end will be only of iron at a distance of 10 cm at any temperature. Let us consider the initial length of iron and brass to be-Question:11.23
Answer:
For, the above situation, we need to make a double container whose volume difference will be 100cc.Question:11.24
Calculate the stress developed inside a tooth cavity filled with copper when hot tea at temperature of
Answer:
LetQuestion:11.25
Answer:
Given data:Question:11.26
Answer:
From one end to another end the temperature of rod varies fromQuestion:11.27
Answer:
Given: E =
We here provide our students with the best NCERT Exemplar Class 11 Physics solutions chapter 11 PDF download that they can get for the NCERT questions. NCERT is the major part of entrance exam preparation. Therefore, being well acquainted with the NCERT questions and their solutions can give a major boost to the chapter's prep. We have here detailed NCERT Exemplar Class 11 Physics chapter 11 solutions, which can be studied both online and offline by downloading the same in PDF format.
1. Temperature and Heat:
2. Measurement of Heat:
3. Ideal Gas Equation and Absolute Temperature:
4. Thermal Expansion:
5. Specific Heat Capacity:
6. Calorimetry:
7. Change of State:
8. Heat Transfer:
9. Newton's Law of Cooling:
Chapter 1 | Units and Measurement |
Chapter 2 | Motion in a straight line |
Chapter 3 | Motion in a Plane |
Chapter 4 | Laws of Motion |
Chapter 5 | Work, Energy and Power |
Chapter 6 | System of Particles and Rotational motion |
Chapter 7 | Gravitation |
Chapter 8 | Mechanical Properties of Solids |
Chapter 9 | Mechanical Properties of Fluids |
Chapter 10 | Thermal Properties of Matter |
Chapter 11 | Thermodynamics |
Chapter 12 | Kinetic Theory |
Chapter 13 | Oscillations |
Chapter 14 | Waves |
Yes, this chapter is one of the most crucial physics chapters as, every year, questions are asked from these topics.
The questions are solved in the most detailed way for the students. We have made sure to add both theory and numerical in a way that is both CBSE accepted and is easy to retain.
Yes, these solutions are highly helpful to clear both theoretical understandings of the chapter, and also get an idea of how to solve numerical questions in an exam.
It is used in railway tracks, bridges, hot water pipes, and thermostats to stop the damage due to expansion.
Heat capacity is total heat needed to change temperature, while specific heat is heat required to raise 1 kg of a substance by 1°C.
Water expands below 4°C, making ice float, which helps aquatic life survive in winter.
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