Question # 1

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

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0 J

2 J

5 J

10 J

When heat is removed from the system

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negative

positive

zero

any one of them

Pressure of a gas at constant volume is proportion to

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Total energy of gas

Average P.E to molecules

Average K.E of molecules

Total internal energy of gas

An isochoric process is one which take place at

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Constant internal energy

Constant entropy

Constant volume

Constant pressure

Truth of kinetic energy is confirmed by:

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Diffusion of gases

Brownian motion

Both A and B

None of these

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

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100 K

273 K

0 K

-273 K

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

A carnot cycle consists of

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One step

two step

three steps

four steps

In thermodynamics, internal energy is the function of

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temperature

pressure

state

none of them

The heat required to raise the temperature of one mole of the substance through 1 K is called

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heat capacity

specific heat capacity

molar specific heat

all of them

The internal energy of an ideal gas system is generally the

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translational K.E of molecules

vibrational K.E of molecules

rotational K.E of molecules

all of them

When the temperature of source and sink of a heat engine become equal entropy change will be

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Zero

Max

Min

-ve

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

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negative

positive

zero

any one of them

The example of irreversible process is

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slowly liquification

slowly evaporation

an explosion

all of them

Hotness and coldness of an object is represented in terms:

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Heat

Temperature

Chemical energy

None of these

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

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35 %

40 %

35 to 40 %

25 %

At absolute temperature, the kinetic energy of the molecules

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Becomes zero

Becomes maximum

Becomes minimum

Remain constant

The absolute temperature for an ideal gas is

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directly proportional to the rotational K.E of gas molecules

directly proportional to the vibrational K.E of gas molecules

directly proportional to the average translational K.E.of gas molecules

directly proportional to the P.E. of gas molecules

The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

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546 K

273 K

546°C

273°C

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