Question # 1

Electromagnetic waves emitted by hot bodies are called:

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Photoelectrons

Alpha rays

Thermal radiation

None of these

The absolute temperature of the tripple point of water is

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100°C

4°C

373 K

273.16 K

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

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81 K

355 K

627 K

627°C

If the formula PV = nRT, n denotes:

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Number of molecules per unit volume

Number of moles

Number of molecules

None of these

Rate of diffusion is

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Faster in solids than in liquids and gases

Faster in liquids than in solids and gases

Equal to solids, liquids and gases

Faster in gases than in liquids and solids

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

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positive

negative

zero

any one of them

The relationship between Boltzmann constant k with R and N_Ais given as:

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k = RN_A

k =R/N_A

k = NR/N_A

None of these

Triple point of water is

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273.16°F

372.16K

273.16°F

273.16

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

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A greater than than of B

A is equal to that of B

A is less than that of B

A is twice the pressure of B

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

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Zero degree Celsius

Zero Kelvin

Critical temperature

Above critical temperature

When heat is removed from the system

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negative

positive

zero

any one of them

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

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isochoric process

isothermal process

adiabatic process

none of them

Which of the following is a state variable

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entropy

pressure

volume

all of them

If a liquid is heated in weightlessness, the heat is transmitted through

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Conduction

Convection

Radiation

Neither, because the liquid cannot be heated in weightlessness

Efficiency of carnot engine is independent of the

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temperature of sink

temperature of source

nature of the working substances

none of them

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

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