# Physics Quiz Questions for Competitive Exams – Physics Online GK

# Physics **Quiz Questions** for Competitive Exams – **Physics** Online GK

1. Name an object which has no potential, energy but has only kinetic energy:

Answer: A running vehicle.

2. What do you mean by a potential energy?

Answer: Potential energy is the stored energy.

3. What is the escape velocity from the moon?

Answer: 2.37 km/s.

4. Which is the direction of rotation of a synchronous satellite of earth?

Answer: West to east.

5. Which force is needed to change the direction of a moving body?

Answer: External unbalanced.

6. The momentum of a body depends on what?

Answer: Its mass and velocity.

7. What is the formula for potential energy?

Answer: mgh.

8. What is the co-efficient of restitution *e* for a perfectly, elastic collision?

Answer: 1.

9. What is the co-efficient of restitution *e* for a perfectly inelastic collision?

Answer: 0.

10. How many times is the energy increased if the unit of force and length be each increased by four times?

Answer: 16 times.

11. What is the mechanical advantage in a machine where a resistance W is overcome by applying an effort p?

Answer: w/p

12. How much work a man does when he pushes a wall and fails to displace it?

Answer: No work at all.

13. Why does an athlete run some distance before taking a long jump?

Answer: By running the athlete gives himself larger inertia of motion.

14. Which force done by the system will increase the potential energy of the system?

Answer: A conservative force.

15. Two particles of masses 1 g and 4 g are moving with equal linear momenta. What is the ratio of their kinetic energies?

Answer: 4.

16. An engine develops 10 kw of power. How much time will it take to lift a mass of 200 kg to height of 40 meter (g = 10 ms^{2})

Answer: 8 sec.

17. What is called the energy, which an electron acquires when accelerated through a potential difference of 1 voit?

Answer: 1 e v.

18. What is called the perpendicular distance from effort to fulcrum?

Answer: Effort arm.

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