ECAT Pre General Science Chapter 11 online mcq test with answers for Physics chapter 11 (Heart & Thermodynamics)

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Sr.#	Question	Answer
1	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
2	An isochoric process is one which take place at	A. Constant internal energy B. Constant entropy C. Constant volume D. Constant pressure
3	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
4	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%
5	Generally a temperature scale is established by using certain physical properties of a material which varies	A. nonlinearly with temperature B. linearly with temperature C. either of them D. none of them
6	In the study of thermodynamics, which gas is considered as the working substance	A. real gas B. ideal gas C. any gas may be ideal or real D. none of them
7	When heat is added into the system then change in entropy is	A. negative B. positive C. zero D. any one of them
8	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
9	A real gas can be approximated to an ideal gas at	A. Low density B. High pressure C. High density D. Low temperature
10	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
11	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
12	The work done on the system by the environment is considered as	A. positive B. negative C. zero D. any one of them
13	Rice takes longest to cook	A. In a submarine 100 m below the surface of the sea B. At sea level C. At Murree D. At Mount Everest
14	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
15	A succession of events which bring the system back to its initial condition is called	A. reversible process B. irreversible process C. a cycle D. none of them
16	The basis to define a temperature scale that is independent of material properties is provided by	A. carbon cycle B. nitrogen cycle C. Carnot cycle D. irreversible cycle
17	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
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	In an adiabatic expansion, the temperature of the gas	A. increases B. becomes zero C. decreases D. decreases rapidly
20	The state in which ice, water and vapour coexists in equilibrium is called	A. zero degree celsius B. zero degree fahrenheit C. absolute zero D. 373 K
21	R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes	A. 2V B. 3V C. 0.5V D. V
22	The absolute temperature for an ideal gas is	A. directly proportional to the rotational K.E of gas molecules B. directly proportional to the vibrational K.E of gas molecules C. directly proportional to the average translational K.E.of gas molecules D. directly proportional to the P.E. of gas molecules
23	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
24	On a cold morning a metal surface will fell colder to touch than a wooden surface, because	A. Metal has high specific heat B. Metal has high thermal conductivity C. Metal has low specific heat D. Metal has low thermal conductivity
25	The rate of change of momentum of a molecule is equal to:	A. Pressure B. Work C. Density D. Force
26	In an adiabatic process the work is done at the expense of the	A. energy supplied to the system B. energy gained from the surroundings C. internal energy D. none of them
27	A reversible cycle is the one in which	A. some of the changes are reversible B. all of the changes are reversible C. all of the changes are irreversible D. none of them
28	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	A. Clausius statement of second law B. Kelvin'sstatement of second law C. Clausius statement of first law D. Kelvin's statement of first law
29	The ideal gas law is	A. P = nRT B. V = nRT C. PV =RT D. PV =nRT
30	When two objects come to common temperature, the body is said to be in:	A. Static equilibrium B. Dynamic equilibrium C. Thermal equilibrium 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

On colliding in a closed container, the gas molecules

Which of the following is not an assumption of kinetic energy

If R is gas constant for 1 gram mole, Cpand Cvare specific heat for a solid then

Pressure of a gas at constant volume is proportion to

The absolute temperature for an ideal gas is

Rate of diffusion is

On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed

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

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

Two metal rods A and B have their initial lengths in the ratio 2 : 3 and coefficients of linear expansion in the ratio 4 : 3. When they are heated through same temperature difference the ratio of their linear expansion is

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

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 efficiency of carnot engine cannot be 100% or one unless cold reservoir is at

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

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

Triple point of water is

In a heat engine, heat is supplied by the

In an ideal gas, the molecules have:

A carnot cycle consists of

At absolute temperature, the kinetic energy of the molecules

When two objects are rubbed together, their internal energy

The basis to define a temperature scale that is independent of material properties is provided by

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

Which quantity is important in stating the entropy of the system

The unit of thermodynamical scale is

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

The disorder in the system increases due to the

A typical four stroke petrol engine undergoes how many successive processes in each cycle

The pressure of gas everywhere inside the vessel will be the same provided the gas is of

First law of thermodynamics is consequence of conservation of

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If R is gas constant for 1 gram mole, C_pand C_vare specific heat for a solid then

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: