Question # 1

When a gas is compressed:

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Its internal energy decreases

Its temperature decreases

Its temperature increases

None of these

Which of the following does not have the same units:

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Work

Heat

Kinetic energy

Power

The efficiency of a practical heat engine:

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Can be 100%

Can not be 100%

Is always Zero

None of these

The nature of thermal radiation is similar to:

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Ultraviolet rays

Light rays

Both of them

None of them

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

While dealing with the processes i thermodynamics, the working substances is usually:

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Oxygen gas

Hydrogen gas

Ideal gas

None of these

One degree of thermodynamics scale of temperature is called:

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Celsius

Fahrenheit

Kelvin

Radian

Absolute zero is considered as that temperature at which:

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All liquids become gases

All gases become liquids

Water freezes

None of these

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

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Energy

Angular momentum

Change

Linear momentum

Carnot cycle is:

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Reversible

Irreversible

Sometimes A, Sometimes B

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

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

Steam engine is:

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An optical system

A thermal system

A thermodynamic system

None of these

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

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

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Positive

Negative

Zero

None of these

If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:

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-2 mv

Zero

2 mv

mv

The efficiency of a particle heat engine:

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can be 100%

Cannot be 100%

Is always zero

None of these

A certain engine coverts 20% of available heat energy into work. Then its efficiency will be:

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20%

80%

50%

None of these

Number of spark plugs needed in diesel engine is:

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Four

Five

Six

None of these

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

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Heat

Temperature

Chemicial

None of these

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MDCAT Physics Chapter 5 Thermodynamics Online Test MCQs With Answers

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