Online Test

Question # 1

The cars usually have cylinders on the crankshaft are

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2

3

4

6

Thermocouple changes

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W.D into heat energy

Electric energy into heat

Heat into W.D

Heat energy into electric energy

In petrol engine, the first stroke is the

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Power stroke

In take stroke

Exhaust stroke

None of these

Temperature of a system is defined as

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Initial K.E. of its molecules

Instantaneous K.E. of its molecules

Average K.E. of its molecules

All of these

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

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positive

negative

zero

any one of them

The approximate efficiency of steam turbine is

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35 - 46 %

40 - 43 %

29 - 36 %

30 - 47 %

Change in momentum per second is:

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Product force and time

Product of pressure and area

Ratio of pressure and area

None of these

The thermodynamic scale of temperature starts from

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273 K

Zero

273.16 K

None of these

If an ideal gas is isothermally expanded its interval energy will

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Increase

Decrease

Remain same

Increase or decrease depending upon initial temperature

The first law of thermodynamics defined as

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Conversion of heat energy into mechanical energy

Conversion of heat energy into vibrational energy

Conversion of heat energy into translational energy

All of these

For making cooking utensils,which of the following pairs of properties is most suited?

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Low specific heat and high conductivity

Low specific heat and low conductivity

High specific heat and high conductivity

High specific heat and low conductivity

In free expansion of a gas the internal energy of the system

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Increase

Decreases

Is unchanged

First increases then decreases

In which process the change in internal energy of the system is zero:

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Isochoric process

Isobaric process

Adiabatic process

Isothermal process

Diesel engine coverts ____________ of available heat energy into work.

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20% to 25%

25% to 30%

30% to 35%

35% to 40%

At what temperature does the mean kinetic energy of hydrogen atoms increase to such extent that they will escape out of the gravitational field of earth forever

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10075°K

18000°K

14075°K

22000°K

A device which convert heat energy into mechanical energy is called

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Heat engine

Pettier engine

Carnot engine

All of above

The relation between Cp and Cv is given by

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Cp = Cv

Cp < Cv

Cp > Cv

None of these

The temperature at which the reading of Fahrenheit thermometer will be double that of a centigrade thermometer is

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160°C

180°C

140°C

100°C

A piece of ice at 0°C dropped into water at 0°C then ice will

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Melt

Be converted to water

Not melt

Partially melt

The number of translation degrees of freedom for a diatomic gas is

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2

3

5

6

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