Question # 1

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

Choose an answer

Newton's second law

Pascal's law

Carnot theorem

Second law of thermodynamics

Which of the following does not have the same units:

Choose an answer

Work

Heat

Kinetic energy

Power

An isochoric process is one which take place at

Choose an answer

Constant internal energy

Constant entropy

Constant volume

Constant pressure

Triple point of water is

Choose an answer

273.16°F

372.16K

273.16°F

273.16

The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

Choose an answer

546 K

273 K

546°C

273°C

The efficiency of petrol engine is usually not more than 25% to 30% because of

Choose an answer

friction

heat losses

both of them

none of them

A succession of events which bring the system back to its initial condition is called

Choose an answer

reversible process

irreversible process

a cycle

none of them

The value of E₀in coulomb's law is:

Choose an answer

9 x 10⁹Nm²C^-2

8.85 x 10^-12C²N^-1m^-2

8.85 x 10^-12Nm²C^-2

9 x 10⁹C²N^-1m^-2

The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

Choose an answer

70%

100%

35%

38%

The ideal gas law is

Choose an answer

P = nRT

V = nRT

PV =RT

PV =nRT

The pressure exerted by the gas is

Choose an answer

directly proportional to the P.E

inversely proportional to the P.E

inversely proportional to the K.E

directly proportional to the K.E

Pressure may be define as _______ per second per unit area:

Choose an answer

Change in force

Change in momentum

Change in energy

Work done

A carnot cycle consists of

Choose an answer

One step

two step

three steps

four steps

The volume of universal gas constant R is:

Choose an answer

8.314 J/K mole K

8314 J/K mole K

8.314 J/mole K

None of these

The efficiency of diesel engine is

Choose an answer

25%

25 - 30%

35%

35 - 40%

The absolute temperature for an ideal gas is

Choose an answer

directly proportional to the rotational K.E of gas molecules

directly proportional to the vibrational K.E of gas molecules

directly proportional to the average translational K.E.of gas molecules

directly proportional to the P.E. of gas molecules

Melting point of ice

Choose an answer

Increases with increasing pressure

Decreases with increasing pressure

Is independent of pressure

Is proportional to pressure

The coefficient of linear expansion of iron is 0.000011 per°K. An iron rod is 10 metre long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to

Choose an answer

0°C

10°C

17°C

20°C

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

Choose an answer

negative

positive

zero

any one of them

In the study of thermodynamics, which gas is considered as the working substance

Choose an answer

real gas

ideal gas

any gas may be ideal or real

none of them

One mole of any substance contain

Choose an answer

same number of molecules

different number of molecules

may be same or different

none of them

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 carnot engine cannot be 100% or one unless cold reservoir is at

Choose an answer

100 K

273 K

0 K

-273 K

An irreversible heat flow from a hot to cold substances of a system, causes the disorder to

Choose an answer

decrease

remains the same

increase

any one of them

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

Choose an answer

Ideal gas

Inert gas

Real gas

None of these

In all natural processes where heat flows from one system to another, there is always a net

Choose an answer

decrease in entropy

increase in entropy

decrease or increase in entropy

none of them

Efficiency of carnot engine is independent of the

Choose an answer

temperature of sink

temperature of source

nature of the working substances

none of them

If the volume of the gas is to be increased by 4 times, then

Choose an answer

Temperature and pressure must be doubled

At constant P the temperature must be increased by 4 times

At constant T the pressure must be increased by four times

It cannot be increased

A heat engine is that which converts

Choose an answer

mechanical energy into thermal energy

thermal energy into mechanical energy

K.E into potential energy

heat energy into light energy

While deriving the equation for pressure of a gas we consider the

Choose an answer

rotational motion of molecules

vibrational motion of molecules

linear motion of molecules

all of them

More Classes

Other Links

Physics ECAT Pre Engineering 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

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