Work, Energy and Power Triumph Quiz

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1. Which of the following energy change involves frictional force? i. Potential energy to sound energy ii. Chemical energy to heat energy iii. Kinetic energy to heat energy iv. Chemical energy to heat energy Choose the correct option among the following: (a) Both (i) and (ii) (b) Only (iv) (c)Both (ii) and (iii) (d) Only (iii)

2. When a body falls freely towards the earth, then its total energy (a) Decreases (b) Increases (c) First increases and then decreases (d) Remains constant

3. When a body like earth is moving in a circular path the work done in that case is zero because: (a) Centripetal force acts in the direction of motion of the body (b) Centripetal force acts along the radius of circular path (c) Gravitational force acts along the radius of circular path (d) Centrifugal force acts perpendicular to the radius of circular path

4. A car is accelerated on a leveled road and attains a velocity 4 times of its initial velocity. In this process, the kinetic energy of the car (a) Becomes twice to that of the initial (b) Becomes four times to that of the initial (c) Remains the same (d) Becomes 16 times to that of the initial

5. The momentum of a bullet of mass 20 g fired from a gun is 10 kg m/s. The kinetic energy of this bullet in kJ will be: (a) 25 (b) 2.5 (c) 0.25 (d) 5

6. Which one of the following is not the unit of energy? (a) Kilowatt (b) Kilo Joule (c) Joule (d) Newton meter

7. The form of energy possessed by a flying bird is: (a) Kinetic energy (b) Potential energy (c) Both kinetic and potential energy (d) Can’t say

8. In the dams water is stored in the high reservoirs and then made to fall down. This falling water then rotates the turbines to generate electricity. In this energy conversion process can you tell the initial and final energies respectively? (a) Kinetic energy and electrical energy (b) Potential energy and kinetic energy (c) Potential energy and electrical energy (d) Kinetic energy and potential energy

9. A man of mass 50 kg jumps to a height of 1 m. His potential energy at the highest point is(g = 10 m/s2): (a) 50 J (b) 500 J (c) 5 J (d) 5000 J

10. The type of energy possessed by a simple pendulum, when it is at the mean position is: (a) Kinetic energy (b) Gravitational Potential energy (c) Kinetic + Potential energy (d) Sound energy

11. A body is falling from a height h. After it has fallen to a height of h/2, it will possess: (a) Only kinetic energy (b) Half kinetic and half potential energy (c) Only potential energy (d) More kinetic and less potential energy

12. Two objects of masses 1 × 10-3kg and 4 × 10-3 kg have equal momentum. What is the ratio of their kinetic energies? (a) 2:1 (b) 4:1 (c) 1:4 (d) 1:2

13. The work done on an object does not depend upon the: (a) Angle between force and displacement (b) Force applied (c) Initial velocity of the object (d) Displacement

14. An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same: (a) Potential energy (b) Momenta (c) Acceleration (d) Kinetic energy

15. A microphone converts: (a) Sound energy into mechanical energy in stereo system (b) Sound energy into electrical energy in public address system (c) Electrical energy into sound energy in ordinary telephone (d) Microwave energy into sound energy in a mobile phone