Question # 1

First law of thermodynamic is special case of

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Law of conservation of energy

Charle's law

Law of conservation of mass

Boyle's law

While deriving the equation for pressure of a gas we consider the

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rotational motion of molecules

vibrational motion of molecules

linear motion of molecules

all of them

No spark plug is needed in

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petrol engine

diesel engine

both of them

none of them

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 product of the pressure and volume of an ideal gas is

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A constant

Approximately equal to the universal gas constant

Directly proportional to its temperature

Inversely proportional to its temperature

In thermodynamics, internal energy is the function of

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temperature

pressure

state

none of them

First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about

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how heat is absorbed

how heat extracted

how this conversion takes place

none of them

In case of an ideal gas, the P.E associated with its molecule is

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maximum

zero

minimum

not fixed

Which of the following is not thermo dynamical function?

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Enthalpy

Work done

Gibb's energy

Internal energy

A carnot cycle consists of

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One step

two step

three steps

four steps

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

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

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

A reversible cycle is the one in which

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some of the changes are reversible

all of the changes are reversible

all of the changes are irreversible

none of them

If a liquid is heated in weightlessness, the heat is transmitted through

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Conduction

Convection

Radiation

Neither, because the liquid cannot be heated in weightlessness

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

One kilogram of different substances contain

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same number of molecules

different number of molecules

may be same or different

none of them

Maximum density of H₂O is at the temperature

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32°F

39.2°F

42°F

4°F

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

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

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

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

In the formula P = N₀KT, N₀denotes:

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Number of molecules per unit per volume

Number of moles

Number of molecules

None of these

If the formula PV = nRT, n denotes:

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Number of molecules per unit volume

Number of moles

Number of molecules

None of these

In an ideal gas, the molecules have:

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Kinetic energy only

Potential energy only

Both KE and PE

None of these

The pressure of gas everywhere inside the vessel will be the same provided the gas is of

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Non-uniform density

uniform density

high density

low density

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

Melting point of ice

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Increases with increasing pressure

Decreases with increasing pressure

Is independent of pressure

Is proportional to pressure

Triple point of water is

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273.16°F

372.16K

273.16°F

273.16

An irreversible heat flow from a hot to cold substances of a system, causes the disorder to

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decrease

remains the same

increase

any one of them

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