Question # 1

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

Choose an answer

positive

negative

zero

any one of them

The efficiency of diesel engine is

Choose an answer

25%

25 - 30%

35%

35 - 40%

While deriving equation of pressure by kinetic theory of gases, we take into account:

Choose an answer

Only linear motion of molecules

Only rotational motion

Only vibratory motion

All of these

A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be

Choose an answer

1/2

More than 1/2

Less than 1/2

Between 1 and 2

Internal energy is the sum of all the forms of

Choose an answer

K.E

P.E

both of them

none of them

The product of the pressure and volume of an ideal gas is

Choose an answer

A constant

Approximately equal to the universal gas constant

Directly proportional to its temperature

Inversely proportional to its temperature

The behaviour of gases is well accounted by the kinetic theory based on

Choose an answer

microscopic approach

macroscopic approach

both of them

none of them

Which of the following does not have the same units:

Choose an answer

Work

Heat

Kinetic energy

Power

When the temperature of source and sink of a heat engine become equal entropy change will be

Choose an answer

Zero

Max

Min

-ve

A diatomic gas molecule has

Choose an answer

translational energy

rotaional energy

vibrational energy

all of them

The Boltzman constant has the value

Choose an answer

1.38 x 10^-23JK^-1

1.28 x 10^-23JK^-1

1.38 x 10^-26JK^-1

1.28 x 10^-26JK^-1

If N is the total number of molecules and V is the volume of the container, then the expression for the pressure of gas is

Choose an answer

P=P/V<1/2mv²>

P=2N/V<1/2mv²>

P=2/3N/V<1/2mv²>

P=2/3N/V<mv²>

The curve representing an isothermal process is called

Choose an answer

adiabat

isotherm

fixed temperature

none of them

An amount of water of mass 20 g at 0°C is mixed with 40 g of water at 10°C. Final temperature of mixture is

Choose an answer

-20°C

6.67°C

5°C

0°C

When two objects are rubbed together, their internal energy

Choose an answer

remains same

decreases

remains the same then decreases

increases

Absolute temperature can be calculated by

Choose an answer

Means squares velocity

Motion of the molecule

Both A and B

None of these

More Classes

Other Links

ECAT Physics Chapter 11 Heat & 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