Question # 1

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

Which of the following is not an assumption of kinetic energy

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a finite volume of gas consists of very large number of molecules

the gas molecules are in random motion

collision between the gas molecules are inelastic

the size of the gas molecules is much smaller than the separation between molecules

Which of the following does not have the same units:

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Work

Heat

Kinetic energy

Power

Electromagnetic waves emitted by hot bodies are called:

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Photoelectrons

Alpha rays

Thermal radiation

None of these

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

Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:

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Newton's second law

Pascal's law

Carnot theorem

Second law of thermodynamics

A carnot cycle consists of

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One step

two step

three steps

four steps

The relationship between Boltzmann constant k with R and N_Ais given as:

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k = RN_A

k =R/N_A

k = NR/N_A

None of these

The motion of molecules in gases is:

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Orderly

Random

Circular

All of these

The earliest heat engine was

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petrol engine

diesel engine

electric engine

steam engine

What temperature is the same on Celsius scale as well as on Fahrenheit scale?

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32°C

-32°C

-40°C

-212°C

Maximum density of H₂O is at the temperature

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32°F

39.2°F

42°F

4°F

Truth of kinetic energy is confirmed by:

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Diffusion of gases

Brownian motion

Both A and B

None of these

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

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negative

positive

zero

any one 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

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