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	If the formula PV = nRT, n denotes:	A. Number of molecules per unit volume B. Number of moles C. Number of molecules D. None of these
2	The work done on the system by the environment is considered as	A. positive B. negative C. zero D. any one of them
3	On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed	A. adiabatically B. isothermally C. isochorcally D. isobarically
4	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
5	If R is gas constant for 1 gram mole, C_pand C_vare specific heat for a solid then	A. C_p- C_v= R B. C_p- C_{v < R} C. C_p- C_{v = 0} D. C_p- C_{v > R}
6	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
7	Good absorbers of heat are	A. Poor emitters B. Non emitters C. Good emitters D. Highly polarized
8	If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:	A. -2 mv B. Zero C. 2 mv D. mv
9	The concept of entropy was introduced into the study of thermodynamics in	A. 1856 B. 1865 C. 1656 D. 1685
10	Real gases strictly obey gas law at:	A. High pressure and low temperatures B. Low pressures and high temperatures C. High pressures and high temperatures D. None of these

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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

A heat engine is that which converts

An irreversible heat flow from a hot to cold substances of a system, causes the disorder to

Melting point of ice

Efficiency of carnot engine is independent of the

Adiabatic change occurs when the gas

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

If an amount of heat enters the system it could

In all natural processes where heat flows from one system to another, there is always a net

When heat is added into the system then change in entropy is

In which process the condition for the application of Boyle's law on the gas is fulfilled

Which of the following is not an example of adiabatic process

Hotness and coldness of an object is represented in terms:

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

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

Rice takes longest to cook

The behaviour of gases is well accounted by the kinetic theory based on

Boyle's law is applicable in

At constant volume temperature is increased. Then

10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?

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

Good absorbers of heat are

In an ideal gas, the molecules have:

The second law of thermodynamics is concerned with the circumstances in which

The work done by the system on its environment is considered as

Truth of kinetic energy is confirmed by:

The motion of molecules in gases is:

Generally a temperature scale is established by

Pressure of a gas at constant volume is proportion to

The example of irreversible process is

Absolute temperature can be calculated by

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