Question # 1

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

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microscopic approach

macroscopic approach

both of them

none of them

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

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adiabatically

isothermally

isochorically

isobarically

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

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a source contains a large amount of heat energy

two sources at the same temperature

two sources at the different temperatures

a source contains a small amount of energy

Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:

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N = nN_Am = MN_A

n = N N_A, M = mN_A

M = N_A/N , N_A= m/n

N = nN_A, M = mN_A

Boyle's law is applicable in

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Isochoric process

Isothermal process

Isobaric process

Isotonic process

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

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70%

100%

35%

38%

A reversible cycle is the one in which

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some of the changes are reversible

all of the changes are reversible

all of the changes are irreversible

none of them

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

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C_p- C_v= R

C_p- C_{v < R}

C_p- C_{v = 0}

C_p- C_{v > R}

Absolute temperature can be calculated by

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Means squares velocity

Motion of the molecule

Both A and B

None of these

Internal energy is the sum of all the forms of

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K.E

P.E

both of them

none of them

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

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adiabatic process

isothermal process

isochoric process

none of them

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

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heat capacity

specific heat capacity

specific heat at constant volume

specific heat at constant pressure

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

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2.0 x 10^-5/°C

4.0x10^-5/°C

6.0x10^-5/°C

2.33x10^-5/°C

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

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one

two

three

four

When heat is removed from the system

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negative

positive

zero

any one of them

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ECAT Physics Chapter 11 Heat & Thermodynamics Online Test MCQs With Answers

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