Engineering Physics I Practice Test 5

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

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

3. Assertion: Reversible systems are difficult to find in the real world.
Reason: Most process is dissipative in nature.

4. The mass of the moon is 1% of the mass of the earth. The ratio of gravitational pull on moon and that of moon in earth will be ___________

5. A point mass m is placed inside a spherical shell of radius R and mass M at a distance R/2 from the centre of the shell. The gravitational force exerted by the shell on the point mass is ___________

6. The temperature of sink of Carnot’s engine is 27°C. If the efficiency of the engine is 25%, then the temperature of source must be ___________

7. What is Black hole?

8. The mean kinetic energy of one mole of gas per degree of freedom (on the basis of a kinetic theory of gases) is ___________

9. The efficiency of Carnot’s engine operating between reservoirs, maintained at temperature 27°C and -123°C is ___________

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