Engineering Physics I Practice Test 5

1. If the temperature of a rod is increased by 10°C, its length increases by 1%. What is the percentage change in volume of the body of the same material for 10°C increase in temperature?

2. Calculate the work done if temperature is changes from 0°C to 200°C at one atmosphere.

200 cal

800 cal

400 cal

100 cal

3. Assertion: Air pressure in a car tyre increases during driving.
Reason: Absolute zero temperature is not zero energy temperature.

Both assertion and reason are true and the reason is the correct explanation of the assertion

Both assertion and reason are false

Assertion it true but the reason is false

Both assertion and reason are true but the reason is not a correct explanation of the assertion

4. In order that the heat flows from one part of a solid to another part, what is required?

Temperature gradient

Uniform density

Uniform temperature

Density gradient

5. The degree of freedom in case of a monoatomic gas is ___________

6. The temperature of gas is held constant, while its volume is decreased. The pressure exerted by the gas on the wall of the container increases, because of its molecules ___________

Strike the walls with large farce

Strike the walls more frequently

Are in contact with the walls for a shorter time

Strike the walls with higher velocities

7. Statement: The root mean square and most probable speeds of the molecules in a gas is symmetrical.
Reason: The Maxwell distribution for the speed to molecules in a gas is symmetrical.

Both statement and reason are true but the reason is not a correct explanation of the statement

Statement it true but the reason is false

Both statement and reason are false

Both statement and reason are true and the reason is the correct explanation of the statement

8. The mechanical energy can be completely converted into heat energy but the whole of the heat energy cannot be converted into mechanical energy.

False

True

9. We have a jar filled with gas characterised by parameters P, V and T and another jar B filled with a gas with parameters 2P, V/4,2T; where the symbols have their usual meanings. The ratio of the number of molecules of jar A to those of jar B is?

2:1

1:1

1:2

4:1

10. If the amount of heat given to a system is 35 J and the amount of work done by the system is -15J and the amount of work done by the system is -15J, then the change in the internal energy of the system is?

50J

20J

-50J