Question # 1

Internal energy is the sum of all the forms of

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K.E

P.E

both of them

none of them

Boyle's law is applicable in

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Isochoric process

Isothermal process

Isobaric process

Isotonic process

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

On a cold morning a metal surface will fell colder to touch than a wooden surface, because

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Metal has high specific heat

Metal has high thermal conductivity

Metal has low specific heat

Metal has low thermal conductivity

Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called

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heat capacity

specific heat capacity

specific heat at constant volume

specific heat at constant pressure

If N is the total number of molecules and V is the volume of the container, then the expression for the pressure of gas is

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P=P/V<1/2mv²>

P=2N/V<1/2mv²>

P=2/3N/V<1/2mv²>

P=2/3N/V<mv²>

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

At O° K which of the following properties of a gas will be zero?

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Kinetic energy

Potential energy

Vibrational energy

Density

At constant temperature, if the density of the gas is increased, its pressure will:

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One kg of a substance

Unit volume of a substance

One mole of a substance

None of these

In the theory of dimensional analysis, heat may be properly represented by:

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ML²T^-2

MT^-2

ML^-1T^-1

None of these

A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:

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Ideal gas

Inert gas

Real gas

None of these

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

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

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

Since the absolute scale is independent of the property of the working substance, hence, can be applied at

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very high temperature

very low temperature

any one of them

none of them

We cannot utilize the heat contents of oceans and atmosphere because

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there is no reservoir at the same temperature

there is no reservoir at the temperature lower than any one of two

there is no reservoir at the temperature higher than any one of two

none of them

In an adiabatic expansion, the temperature of the gas

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increases

becomes zero

decreases

decreases rapidly

During the whole carnot cycle

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Thermal equilibrium is maintained

mechanical equilibrium is maintained

both the thermal and mechanical equilibriumis maintained

both the thermal and mechanical equilibrium is not maintained

Which quantity is important in stating the entropy of the system

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initial entropy

final entropy

change in entropy

none 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

On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves

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outwards

inwards

in either way

none of these

In thermodynamics, internal energy is the function of

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temperature

pressure

state

none of them

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 %

The only significant motion possessed by the mono-atomic gas represented is:

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Translatory

Rotatory

Vibratory

None of these

Electromagnetic waves emitted by hot bodies are called:

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Photoelectrons

Alpha rays

Thermal radiation

None of these

The coefficient of linear expansion of iron is 0.000011 per°K. An iron rod is 10 metre long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to

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0°C

10°C

17°C

20°C

The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called

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heat capacity

specific heat capacity

molar specific heat

molar specific heat at constant volume

If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:

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-2 mv

Zero

2 mv

mv

The Boltzman constant has the value

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1.38 x 10^-23JK^-1

1.28 x 10^-23JK^-1

1.38 x 10^-26JK^-1

1.28 x 10^-26JK^-1

The curve representing an adiabatic process is called

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isotherm

adiabat

adiable

none of them

10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?

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Each have same number of molecules

Don't have same number of molecules

Can't be predicted

None

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