# Physics MCQs on Heat & Temperature

Physics MCQs on Heat & Temperature: Get free access to solved multiple choice questions on Heat & Temperature in Physics.

In this blog post, we have provided Physics MCQs on Heat & Temperature with answers. These Physics MCQs are useful for Senior Secondary classes and for various entrance exams.

## Physics MCQs on Heat & Temperature

1. Young’s modulus of a substance depends on

Its length

Its area

Acceleration due to gravity

None of the above

2. The effect of temperature on the value of modulus of elasticity for various substances in general

It increases with an increase in temperature

Remains Constant

Decrease with rising in temperature

Sometimes Increases and Sometimes Decreases

3. Two water droplets merge with each other to form a larger droplet. In this process

Energy is liberated

Energy is absorbed

Energy is neither liberated nor absorbed

Some mass is converted to energy

4. Two soap bubbles A and B are found at the two open ends of a tube. Bubble A is smaller than bubble B. If the valve on the tube connecting the two bubbles is opened and air can flow freely between the bubbles, then

There is no change in the size of the bubbles

The two bubbles will become of equal size

A will become smaller and B will become larger

B will become smaller and A will become larger

5. The rise in temperature is found to be ……….. in different solids in spite of having the same mass and being supplied the same quantity of heat.

same

different

can’t say

None of these

6. Which of the following is the fastest process of heat transfer?

conduction

convection

insulation

7. The specific heat of a material and other physical quantities related to heat transfer are measured with

Thermometer

Ceilometer

calorimeter

Cathetometer

8. When heat is given to a substance it expands in

length

area

volume

All of the above

9. Which is not an assumption of Kinetic Theory of Gases?

Between collisions, molecules move in straight lines with uniform velocities

The distribution of molecules is not uniform throughout the container

Gas molecules collide with each other and with the walls of the container. These collisions are perfectly elastic

The size of the molecules is negligible compared to the separation between them

10. Which statement is not true?

Solids have more ordered structure than gases

Liquids have more ordered structure than gases

Solids have more ordered structure than liquids

Gases have more ordered structure than liquids

11. The factors directly proportional to the amount of heat conducted through a metal rod are

Area of cross-section

Time of flow of Heat

All of these

12. The unit of heat is

calorie

kcal

joule

All of these

13. The fastest process of heat transfer is

conduction

convection

insulation

14. High temperatures are measured by the

Thermometer

Temperature meter

pyrometer

energy meter

15. Temperature can be measured in, and

°C (Celsius)

°K (Kelvin)

°F (Fahrenheit)

All of these

16. First law of thermodynamics tells nothing about

the direction of the process

the heat is given to it

the work done on it

None of These

17. Reversible process is defined as

The process can be retraced in the opposite direction from its final state to its initial state

The process which cannot be retraced along with the same equilibrium state from the final to the initial state

Any thermodynamic process that occurs at a constant heat

in which system returns back to its initial state

18. The unit of heat is

Calorie

Kcal

Joule

All Of These

19. Process of heat transfer is called

Conduction

Convection

All Of These

20. The fastest process of heat transfer is

conduction

convection

insulation

21. How is heat transferred through a vacuum?

By conduction

By convection

22. How is heat transferred through the walls of a steel radiator?

By conduction

By convection

23. Rate of heat transfer by _______ depends on the temperature difference between the surfaces and also on their areas?

conduction

convection

All of these

24. A very good conductor of heat contains

metals

nonmetals

gases

liquid

25. In radiation, heat is transferred

from one atom/ molecule to another atom/molecule which vibrates about their fixed positions

by the bodily motion of molecules

through electromagnetic waves

All of these

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