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

Sr.#	Question	Answer
1	The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at	A. 100 K B. 273 K C. 0 K D. -273 K
2	In an adiabatic expansion, the temperature of the gas	A. increases B. becomes zero C. decreases D. decreases rapidly
3	Which quantity is important in stating the entropy of the system	A. initial entropy B. final entropy C. change in entropy D. none of them
4	At O° K which of the following properties of a gas will be zero?	A. Kinetic energy B. Potential energy C. Vibrational energy D. Density
5	The bicycle pump provides a good example of	A. first law of thermodynamics B. second law of thermodynamics C. third law of thermodynamics D. none of them
6	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
7	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
8	Pressure exerted by a gas is	A. Independent of density of the gas B. Inversely proportional to the density of the gas C. Directly proportional to the square of the density of the gas D. Directly proportional to the density of the gas
9	When two objects are rubbed together, their internal energy	A. remains same B. decreases C. remains the same then decreases D. increases
10	The curve representing an isothermal process is called	A. adiabat B. isotherm C. fixed temperature D. none of them
11	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
12	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
13	On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands	A. adiabatically B. isothermally C. isochorically D. isobarically
14	Carnot heat engine only used	A. isothermal processes B. adiabatic processes C. both of them D. none of them
15	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
16	If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is	A. 2 : 1 B. 4 : 1 C. 1 : 4 D. 3 : 4
17	First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about	A. how heat is absorbed B. how heat extracted C. how this conversion takes place D. none of them
18	The internal energy of a system does not depend upon the	A. initial state of the system B. final state of the system C. path D. none of them
19	Truth of kinetic energy is confirmed by:	A. Diffusion of gases B. Brownian motion C. Both A and B D. None of these
20	The example of irreversible process is	A. slowly liquification B. slowly evaporation C. an explosion D. all of them
21	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
22	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}
23	A real gas can be approximated to an ideal gas at	A. Low density B. High pressure C. High density D. Low temperature
24	First law of thermodynamics is consequence of conservation of	A. Work B. Energy C. Heat D. All of these
25	If the distance between two charges is doubled, the force between them will become:	A. Double B. Half C. Three times D. One fourth
26	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
27	During the whole carnot cycle	A. Thermal equilibrium is maintained B. mechanical equilibrium is maintained C. both the thermal and mechanical equilibriumis maintained D. both the thermal and mechanical equilibrium is not maintained
28	The concept of entropy was introduced into the study of thermodynamics in	A. 1856 B. 1865 C. 1656 D. 1685
29	Pressure may be define as _______ per second per unit area:	A. Change in force B. Change in momentum C. Change in energy D. Work done
30	Absolute temperature can be calculated by	A. Means squares velocity B. Motion of the molecule C. Both A and B 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

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:

Triple point of water is

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

Heat travels through vacuum by

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

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

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

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

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

The ideal gas law is

Pressure exerted by a gas is

For making cooking utensils, which of the following pairs of properties is most suited?

If the formula PV = nRT, n denotes:

No spark plug is needed in

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

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

Carnot heat engine only used

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

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

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

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

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

Which of the following is not an assumption of kinetic energy

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

The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called

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

A real gas can be approximated to an ideal gas at

On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands

Melting point of ice

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

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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: