1. Creation of something from nothing is against the law of
2. In the force equation F is equal to-
3. The SI unit of mechanical energy is
4. The force of gravity acting on an object is known as . . . . . . . .
5. An object of 5.0 kg is raised to a height of 2 m, in this process, how much work was done- (g = 9.8m/s2)
6. 900 × 106 J of energy is consumed in a month in a house. How much this energy is in the unit?
7. The kinetic energy of a moving object depends on-
8. The weight of an object is 980 N. If the gravitational acceleration is 9.8 ms-2, find the mass of the object-
9. Match the columns.
Column I
Column II
a. In an electric heater
1. Chemical energy is converted into heat energy
b. In an electric bulb
2. heat energy is converted into mechanical energy
c. In burning of coal
3. Electrical energy is converted into light energy
d. In steam engine
4. Electrical energy is converted into heat energy
| Column I | Column II |
| a. In an electric heater | 1. Chemical energy is converted into heat energy |
| b. In an electric bulb | 2. heat energy is converted into mechanical energy |
| c. In burning of coal | 3. Electrical energy is converted into light energy |
| d. In steam engine | 4. Electrical energy is converted into heat energy |
10. A cricket ball of mass 100g moving with a velocity of 30 m/s is stopped by a player in 0.05 seconds. The average force exerted by the player is-
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