ECAT Pre General Science Chapter 11 online mcq test with answers for Physics chapter 11 (Heart & Thermodynamics)

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Mohsin rajput Rajput 21 - Sep - 2025 06 Min 38 Sec 9/30
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ECAT Physics Chapter 11 Important MCQ's

Sr.#	Question	Answer
1	Efficiency of carnot engine is independent of the	A. temperature of sink B. temperature of source C. nature of the working substances D. none of them
2	Specific heat at constant pressure is greater than the specific heat at constant volume because	A. Heat is used up to increase temperature at constant pressure B. Heat is used by gas for expansions purposes at constant pressure C. Heat is use dup to increase internal energy D. The above statement is invalid
3	Maximum density of H₂O is at the temperature	A. 32°F B. 39.2°F C. 42°F D. 4°F
4	At constant volume temperature is increased. Then	A. Collision on walls will be less B. Number of collisions per unit time will increase C. Collision will be in straight lines D. Collision will not change
5	The concept of entropy was introduced into the study of thermodynamics in	A. 1856 B. 1865 C. 1656 D. 1685
6	The number of translation degress of freedom for a diatomic gas is	A. 2 B. 3 C. 5 D. 6
7	At what temperature the adiabatic change is equivalent to the isothermal change?	A. Zero degree Celsius B. Zero Kelvin C. Critical temperature D. Above critical temperature
8	It is impossible to devise a processes which may convert heat, extracted from a single reservoir, entirely into work without leaving any change in the working system. This is the statement of	A. Clausius statement of second law B. Kelvin'sstatement of second law C. Clausius statement of first law D. Kelvin's statement of first law
9	On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves	A. outwards B. inwards C. in either way D. none of these
10	According to kinetic theory of gases, molecules of a gas behave like	A. Inelastic spheres B. Perfectly elastic rigid sphere C. Perfectly elastic non-rigid spheres D. Inelastic non-rigid spheres

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ECAT Pre General Science Physics Chapter 11 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 11 Heat & Thermodynamics

ECAT Pre General Science Physics Chapter 11 Heat & Thermodynamics

The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :

Efficiency of carnot engine is independent of the

The Boltzman constant has the value

In a heat engine, heat is supplied by the

When two objects are rubbed together, their internal energy

The efficiency of petrol engine is usually not more than 25% to 30% because of

If water in a closed bottle is taken up to the moon and opened, the water gets

Pressure of a gas at constant volume is proportion to

The percentage of available heat energy converted into work by a diesel engine is roughly

In case of an ideal gas, the P.E associated with its molecule is

Hydrogen and helium of same volume V at same temperature T and same pressure P are mixed to have same volume V. The resulting pressure of the mixtures will be

At constant temperature, if the density of the gas is increased, its pressure will:

Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:

In the study of thermodynamics, which gas is considered as the working substance

If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is

Carnot heat engine only used

On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves

At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes:

Absolute temperature can be calculated by

The pressure exerted by the gas is

The ideal gas law is

The only significant motion possessed by the mono-atomic gas represented is:

At O° K which of the following properties of a gas will be zero?

A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be

If an amount of heat enters the system it could

Amount of heat required to raise the temperature of a body through 1 K is called its

Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called

The internal energy of a system does not depend upon the

A heat engine is that which converts

Which of the following is not an example of adiabatic process

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ECAT Physics Chapter 11 Important MCQ's

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