Question # 1

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

The example of reversible process is

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an explosion

changes occur suddenly

slow compression of a gas

all of them

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 kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :

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1.7 x 10³J

10.2 x 10³J

3..4 x 10³J

6.8 x 10³J

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

Amount of heat required to raise the temperature of a body through 1 K is called its

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Specific heat

Water equivalent

Thermal capacity

Entropy

The efficiency of petrol engine is usually not more than 25% to 30% because of

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friction

heat losses

both of them

none of them

Pressure exerted by a gas is

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Independent of density of the gas

Inversely proportional to the density of the gas

Directly proportional to the square of the density of the gas

Directly proportional to the density of the gas

The curve representing an isothermal process is called

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adiabat

isotherm

fixed temperature

none of them

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

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negative

positive

zero

any one of them

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

Which of the following does not have the same units:

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Work

Heat

Kinetic energy

Power

The disorder in the system increases due to the

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removal of heat

addition of heat

removal or addition of heat

none of them

The volume of given mass of a gas will be doubled at atmosphere pressure if the temperature of the gas is changed from 150°C to

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300°C

573°C

600°C

743°C

The temperature of gas is produced by

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At potential energy of its molecules

The kinetic energy of its molecules

The attractive force between its molecules

The repulsive force between its molecules

The basis to define a temperature scale that is independent of material properties is provided by

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carbon cycle

nitrogen cycle

Carnot cycle

irreversible cycle

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

When two objects are rubbed together, their internal energy

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remains same

decreases

remains the same then decreases

increases

The motion of molecules in gases is:

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Orderly

Random

Circular

All of these

When heat is removed from the system

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negative

positive

zero

any one of them

While deriving equation of pressure by kinetic theory of gases, we take into account:

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Only linear motion of molecules

Only rotational motion

Only vibratory motion

All of these

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

Generally a temperature scale is established by using certain physical properties of a material which varies

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nonlinearly with temperature

linearly with temperature

either of them

none of them

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

Triple point of water is

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273.16°F

372.16K

273.16°F

273.16

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

We can express the work in term of

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directly measurable variables

indirectly measurable variables

either of them

both of them

At constant volume temperature is increased. Then

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Collision on walls will be less

Number of collisions per unit time will increase

Collision will be in straight lines

Collision will not change

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

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

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positive

negative

zero

any one of them

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