Question # 1

A process in which no heat enters or leaves the system is called

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isochoric process

isothermal process

adiabatic process

none of them

For the working of a heat engine, there must be

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a source of heat at high temperature

a sink at low temperature

both of them

none of them

Sadi carnot described an ideal heat engine in

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1820

1840

1860

1880

The example of irreversible process is

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slowly liquification

slowly evaporation

an explosion

all of them

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

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

The ideal gas law is

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P = nRT

V = nRT

PV =RT

PV =nRT

A heat engine is that which converts

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mechanical energy into thermal energy

thermal energy into mechanical energy

K.E into potential energy

heat energy into light energy

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 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

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

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Pressure

Work

Density

Force

At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes:

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Double

Remains constant

Half

None of these

R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes

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2V

3V

0.5V

V

In an ideal gas, the molecules have:

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Kinetic energy only

Potential energy only

Both KE and PE

None of these

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 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

Generally a temperature scale is established by

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one fixed point

two fixed point

three fixed point

four fixed point

Which of the following is not thermo dynamical function?

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Enthalpy

Work done

Gibb's energy

Internal energy

No spark plug is needed in

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petrol engine

diesel engine

both of them

none of them

Internal energy is the sum of all the forms of

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K.E

P.E

both of them

none of them

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

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positive

negative

zero

any one of them

Gas constant per molecule is called:

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Universal gas constant

Stefen's constant

Boltzmann constant

Gravitation constant

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

Melting point of ice

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Increases with increasing pressure

Decreases with increasing pressure

Is independent of pressure

Is proportional to pressure

The earliest heat engine was

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petrol engine

diesel engine

electric engine

steam engine

The efficiency of diesel engine is

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25%

25 - 30%

35%

35 - 40%

The pressure exerted by the gas is

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directly proportional to the P.E

inversely proportional to the P.E

inversely proportional to the K.E

directly proportional to the K.E

Triple point of water is

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273.16°F

372.16K

273.16°F

273.16

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

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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