Question # 1

The rate of change of momentum of a molecule is equal to:

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Pressure

Work

Density

Force

When two objects come to common temperature, the body is said to be in:

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Static equilibrium

Dynamic equilibrium

Thermal equilibrium

None of these

Real gases strictly obey gas law at:

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High pressure and low temperatures

Low pressures and high temperatures

High pressures and high temperatures

None of these

In which process the condition for the application of Boyle's law on the gas is fulfilled

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isochoric process

adiabatic process

isothermal process

none of them

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

A process is a reversible process, if the entropy of the system

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increases

decreases

remains constant

none 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

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

If the volume of the gas is to be increased by 4 times, then

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Temperature and pressure must be doubled

At constant P the temperature must be increased by 4 times

At constant T the pressure must be increased by four times

It cannot be increased

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

In all natural processes where heat flows from one system to another, there is always a net

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decrease in entropy

increase in entropy

decrease or increase in entropy

none of them

Which of the following does not have the same units:

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Work

Heat

Kinetic energy

Power

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:

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Force

Density

Work done

Pressure

If the distance between two charges is doubled, the force between them will become:

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Double

Half

Three times

One fourth

One third

The nature of thermal radiation is similar to:

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Ultraviolet rays

Light rays

Both of them

None of these

Heat travels through vacuum by

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Conduction

Convection

Radiation

Both A and B

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

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adiabatically

isothermally

isochorcally

isobarically

When two objects are rubbed together, their internal energy

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remains same

decreases

remains the same then decreases

increases

The example of irreversible process is

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slowly liquification

slowly evaporation

an explosion

all of them

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