Question # 1

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

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2 : 1

4 : 1

1 : 4

3 : 4

Generally a temperature scale is established by

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one fixed point

two fixed point

three fixed point

four fixed point

Hotness and coldness of an object is represented in terms:

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Heat

Temperature

Chemical energy

None of these

The efficiency of diesel engine is

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25%

25 - 30%

35%

35 - 40%

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

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Low specific heat and high conductivity

Low specific heat and low conductivity

High specific heat and high conductivity

High specific heat and low conductivity

If water in a closed bottle is taken up to the moon and opened, the water gets

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Freeze

Boiled

Dissociated into O₂and H₂

Evaporated

The temperature scale approved in SI units is:

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Celsius scale

Kelvin scale

Fehrenheit scale

None of these

For the working of a heat engine, there must be

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a source of heat at high temperature

a sink at low temperature

both of them

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}

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

In an adiabatic expansion, the temperature of the gas

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increases

becomes zero

decreases

decreases rapidly

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

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positive

negative

zero

any one of them

Which of the following is not an example of adiabatic process

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the rapid escape of air from a burst type

the rapid expansion and compression of air through which a sound wave is passing

cloud formation in the atmosphere

none of them

Internal energy is the sum of all the forms of

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K.E

P.E

both of them

none of them

A diatomic gas molecule has

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translational energy

rotaional energy

vibrational energy

all of them

The second law of thermodynamics is concerned with the circumstances in which

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heat can be converted into work

direction of flow of heat

none of them

both of them

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