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	An irreversible heat flow from a hot to cold substances of a system, causes the disorder to	A. decrease B. remains the same C. increase D. any one of them
2	A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:	A. Ideal gas B. Inert gas C. Real gas D. None of these
3	Pressure of a gas at constant volume is proportion to	A. Total energy of gas B. Average P.E to molecules C. Average K.E of molecules D. Total internal energy of gas
4	Two samples A and B of a gas initially of the same temperature and pressure are compressed from a volume V to a volume V/2 such that A is compressed isothermally and B adiabatically. The final pressure	A. A greater than than of B B. A is equal to that of B C. A is less than that of B D. A is twice the pressure of B
5	Absolute temperature can be calculated by	A. Means squares velocity B. Motion of the molecule C. Both A and B D. None of these
6	If the distance between two charges is doubled, the force between them will become:	A. Double B. Half C. Three times D. One fourth
7	Triple point of water is	A. 273.16°F B. 372.16K C. 273.16°F D. 273.16
8	The efficiency of diesel engine is	A. 25% B. 25 - 30% C. 35% D. 35 - 40%
9	The volume of given mass of a gas will be doubled at atmosphere pressure if the temperature of the gas is changed from 150°C to	A. 300°C B. 573°C C. 600°C D. 743°C
10	The efficiency of petrol engine is usually not more than 25% to 30% because of	A. friction B. heat losses C. both of them D. none of them

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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

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 volume temperature is increased. Then

The rate of change of momentum of a molecule is equal to:

A succession of events which bring the system back to its initial condition is called

The concept of entropy was introduced into the study of thermodynamics in

At absolute temperature, the kinetic energy of the molecules

At what temperature the adiabatic change is equivalent to the isothermal change?

Which of the following is not an assumption of kinetic energy

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

The volume of universal gas constant R is:

Triple point of water is

An amount of water of mass 20 g at 0°C is mixed with 40 g of water at 10°C. Final temperature of mixture is

Absolute temperature can be calculated by

The heat required to raise the temperature of one mole of the substance through 1 K is called

According to the second law, which is must to produce work

The curve representing an adiabatic process is called

While deriving the equation for pressure of a gas we consider the

According to kinetic theory of gases, molecules of a gas behave like

R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes

The disorder in the system increases due to the

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

The process which is carried out at constant temperature is known as

We cannot utilize the heat contents of oceans and atmosphere because

Good absorbers of heat are

If 42 J heat is transferred to the system and the work done by the system is 32 J then what will be the change in internal energy

Since the absolute scale is independent of the property of the working substance, hence, can be applied at

The coefficient of linear expansion of iron is 0.000011 per°K. An iron rod is 10 metre long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to

If N is the total number of molecules and V is the volume of the container, then the expression for the pressure of gas is

If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I3gives the:

If a system undergoes a natural process it will go in the direction that causes the entropy of the system plus the environment to increase, this is another statement of

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ECAT Physics Chapter 11 Important MCQ's

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If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I³gives the: