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	The example of reversible process is	A. an explosion B. changes occur suddenly C. slow compression of a gas D. all of them
2	A heat engine is that which converts	A. mechanical energy into thermal energy B. thermal energy into mechanical energy C. K.E into potential energy D. heat energy into light energy
3	Which of the following is a state variable	A. entropy B. pressure C. volume D. all of them
4	The example of irreversible process is	A. slowly liquification B. slowly evaporation C. an explosion D. all of them
5	While deriving the equation for pressure of a gas we consider the	A. rotational motion of molecules B. vibrational motion of molecules C. linear motion of molecules D. all of them
6	The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is	A. 70% B. 100% C. 35% D. 38%
7	In all natural processes where heat flows from one system to another, there is always a net	A. decrease in entropy B. increase in entropy C. decrease or increase in entropy D. none of them
8	When two objects are rubbed together, their internal energy	A. remains same B. decreases C. remains the same then decreases D. increases
9	The number of translation degress of freedom for a diatomic gas is	A. 2 B. 3 C. 5 D. 6
10	The nature of thermal radiation is similar to:	A. Ultraviolet rays B. Light rays C. Both of them 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

Adiabatic change occurs when the gas

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

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

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

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

The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

While deriving equation of pressure by kinetic theory of gases, we take into account:

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

A diatomic gas molecule has

At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be

Pressure may be define as _______ per second per unit area:

Specific heat at constant pressure is greater than the specific heat at constant volume because

Which of the following is not an example of adiabatic process

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

If the volume of the gas is to be increased by 4 times, then

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

What temperature is the same on Celsius scale as well as on Fahrenheit scale?

On a cold morning a metal surface will fell colder to touch than a wooden surface, because

The Boltzman constant has the value

Absolute temperature can be calculated by

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 efficiency of diesel engine is

A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:

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

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

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:

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

The absolute temperature of the tripple point of water is

If the distance between two charges is doubled, the force between them will become:

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

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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: