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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Frankie 09 - Sep - 2022 01 Min 29 Sec 0/120

ECAT Physics Chapter 11 Important MCQ's

Sr.#	Question	Answer
1	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
2	According to the second law, which is must to produce work	A. a source contains a large amount of heat energy B. two sources at the same temperature C. two sources at the different temperatures D. a source contains a small amount of energy
3	If a liquid is heated in weightlessness, the heat is transmitted through	A. Conduction B. Convection C. Radiation D. Neither, because the liquid cannot be heated in weightlessness
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	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
6	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	A. -20°C B. 6.67°C C. 5°C D. 0°C
7	The relationship between Boltzmann constant k with R and N_Ais given as:	A. k = RN_A B. k =R/N_A C. k = NR/N_A D. None of these
8	A real gas can be approximated to an ideal gas at	A. Low density B. High pressure C. High density D. Low temperature
9	At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be	A. 81 K B. 355 K C. 627 K D. 627°C
10	At constant temperature, if the density of the gas is increased, its pressure will:	A. One kg of a substance B. Unit volume of a substance C. One mole of a substance 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

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

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

The pressure exerted by the gas is

Absolute temperature can be calculated by

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

A real gas can be approximated to an ideal gas at

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

In an adiabatic expansion, the temperature of the gas

Carnot heat engine only used

The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be

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

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

The temperature scale approved in SI units is:

The curve representing an adiabatic process is called

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

In the reverse process, the working substance passes through the same stages as in the direct process and

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

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:

The bicycle pump provides a good example of

If an amount of heat enters the system it could

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

Heat travels through vacuum by

When two objects come to common temperature, the body is said to be in:

When the temperature of source and sink of a heat engine become equal entropy change will be

The ideal gas law is

When heat is removed from the system

A process in which no heat enters or leaves the system is called

A process is a reversible process, if the entropy of the system

The Boltzman constant has the value

The unit of thermodynamical scale is

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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: