Question # 1

If temperature of the sink is decreased, efficiency of a carnot engine.

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Remains constant

Decreases

Increases

None of these

The equation PVr = Constant applies to:

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Isothermal process

Adiabatic process

Isobaric process

None of these

One degree of thermodynamics scale of temperature is called:

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Celsius

Fahrenheit

Kelvin

Radian

In an ideal gas, the molecules have:

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Kinetic energy only

Potential energy only

Both KE and PE

None of these

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

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Ideal gas

Inert gas

Real gas

None of these

Electromagnetic waves emitted by hot bodies are called:

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Photoelectrons

Alpha rats

Thermal radiation

None of these

Real gases strictly obey gas laws at:

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High pressures and low temperatures

Low pressures and high temperatures

High pressures and & temperatures

None of these

Thermal radiations are a type of:

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Mechanical waves

Electromagnetic waves

Alpha rays

Electrons

When a gas is compressed:

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Its internal energy decreases

Its temperature decreases

Its temperature increases

None of these

Brownian motion confirms the truth of :

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Wave theory of light

Boyle's law

Kinetic theory of gases

Adiabatic process

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

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Energy

Angular momentum

Change

Linear momentum

The nature of thermal radiation is similar to:

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Ultraviolet rays

Light rays

Both of them

None of them

Avogadro number is known as number of molecules in:

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One kg of a substance

Unit volume of a substance

One mole of a substance

None of these

Truth of kinetic energy theory is confirmed by:

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Diffusion of gases

Brownian motion

Both A and B

None of these

The ideal gas obey gas law at:

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Low tempratures and high pressures

High temperatures and low pressures

All temperatures and pressures

None of these

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

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Internal energy

Pressure

Volume

All of these

The number of molecules in one mole of gas is equal to:

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Avogadro number N_A

Gas constant R

Boltzmann constant k

None of these

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

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Reversible

Irreversible

Sometimes A and B

None of these

Number of spark plugs needed in diesel engine is:

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Four

Five

Six

None of these

The nature of thermal radiation is smaller to:

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Ultraviolet rays

Light rays

Both of them

None of these

No entropy change is associated with:

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Isothermal

Adiabatic process

Isobaric process

None of them

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MDCAT Physics Chapter 5 Thermodynamics Online Test MCQs With Answers

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