Question # 1

The efficiency of a particle heat engine:

Choose an answer

can be 100%

Cannot be 100%

Is always zero

None of these

What will be efficiency of carnot engine when it is operated between the temperatures 47^oC and 127 ^oC:

Choose an answer

Reversible

Irreversible

Sometimes A and B

None of these

Hotness and coldness of an object is represented in terms of:

Choose an answer

Heat

Temperature

Chemicial

None of these

Avogadro number is known as number of molecules in:

Choose an answer

One kg of a substance

Unit volume of a substance

One mole of a substance

None of these

Carnot cycle is:

Choose an answer

Reversible

Irreversible

Sometimes A, Sometimes B

None of these

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

Choose an answer

Adiabatic process

Isothermal process

Isochoric process

None of these

When heat is added to the system, the entropy change is:

Choose an answer

Positive

Negative

Zero

None of these

The law of thermodynamics which discusses the condition under which heat energy is converted into and equivalent amount of work is:

Choose an answer

1st

2nd

3rd

None of these

Most motorbikes have ____________ cylinder/s engine but cars usually have _________ cylinders on the same crankshaft.

Choose an answer

Four , Six

One , four

two , five

None of these

Electromagnetic waves emitted by hot bodies are called:

Choose an answer

Photoelectrons

Alpha rats

Thermal radiation

None of these

Carnot engine is ____________ heat engine.

Choose an answer

A reversible

An irreversible

An ideal

Both A and C

As the working substance of a heat engine completes a cycle, there is no change in:

Choose an answer

Internal energy

Pressure

Volume

All of these

Number of spark plugs needed in diesel engine is:

Choose an answer

Four

Five

Six

None of these

If the temperature difference between hot and cold body is greater the heat engine is:

Choose an answer

Not efficient

Less efficient

More efficient

NOne of above

According to boyle's law, volume of a given mass of a gas is

Choose an answer

Inversely proportional mass at constant pressure

Directly proportional to pressure at constant temprerature

Inversely proportional pressure at constant temprature

None of these

If C_vdonotes molar specific heat at constant volume and𝜟 T is the change in temperature, then C_v𝜟T gives:

Choose an answer

Volume

Pressure

Energy

Entropy

The temperature scale approved in SI units is:

Choose an answer

Calslus scale

Kelvin scale

Fehrenhelt scale

None of these

First law of thermodynamics is merely a statement of law of conversation of:

Choose an answer

Energy

Angular momentum

Change

Linear momentum

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

Choose an answer

Ideal gas

Inert gas

Real gas

None of these

Truth of kinetic energy theory is confirmed by:

Choose an answer

Diffusion of gases

Brownian motion

Both A and B

None of these

More Classes

Other Links

MDCAT Physics Chapter 5 Thermodynamics Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer