Saturday, August 16, 2014


  1.  A spring with spring constant K when stretched through 2cm the potential energy is U. If it is stretched by 6cm. The potential energy will be......
  2. If linear momentum of body is increased by 1.5%, its kinetic energy increases by.......%?
  3. With what velocity should a student of mass 40 kg run so that his kinetic energy becomes 160 J ?
  4. A body of mass 1 kg is thrown upwards with a velocity 20 m/s. It momentarily comes to rest after a height 18m. How much energy is lost due to air friction? (g = 10 m/s2)
  5. Two bodies of masses m1 and m2 have equal kinetic energies. If P1 and P2 are their respective momentum, what is ratio of P2 : P1 ?
  6. A body having a mass of 0.5 kg slips along the wall of a semi spherical smooth surface of radius 20 cm shown in figure. What is the velocity of body at the bottom of the surface?
  7. Two bodies of masses m and 3m have same momentum. their respective kinetic energies E1 and E2 are in the ratio.....
  8. What is the velocity of the bob of a simple pendulum at its mean position, if it is able to rise to vertical height of 18 cm (Take g = 10 m/s2)
  9. If the K.E. of a body is increased by 44%, its momentum will increase by.......                                (A) 20 % (B) 22 % (C) 2 % (D) 120 %
  10. A spherical ball of mass 15 kg stationary at the top of a hill of height 82m. It slides down a smooth surface to the ground, then climbs up another hill of height 32m and finally slides down to horizontal base at a height of 10 m above the ground. The velocity attained by the ball is
  11. A bomb of mass 10 kg explodes into 2 pieces of mass 4 kg and 6 kg. The velocity of mass 4 kg is 1.5 m/s, the K.E. of mass 6 kg is.......(A) 3.84 J (B) 9.6 J (C) 3.00 J (D) 2.5 J
  12. If the water falls from a dam into a turbine wheel 19.6m below, then the velocity of water at the turbine is ...... ( g = 9.8 m/s2)                                                                                                         (A) 9.8 m/s (B) 19.6 m/s (C) 39.2 m/s (D) 98.0 m/s
  13. A bomb of 12 kg divides in two parts whose ratio of masses is 1:4. If kinetic energy of smaller part is 288 J, then momentum of bigger part in kgm/sec will be(A) 48 (B) 72 (C) 108 (D) Data is incomplete
  14. A bomb of mass 3.0 g explodes in air into two pieces of masses 2.0 kg and 1.0 kg. The smaller mass goes at a speed of 80m/s. The total energy imparted to the two fragments is                                    (A) 1.07 KJ (B) 2.14 KJ (C) 2.4 KJ (D) 4.8 KJ
  15. A gun fires a bullet of mass 40 g with a velocity of 50 m/s. Because of this the gun is pushed back with a velocity of 1 m/s. The mass of the gun is (A) 1.5 kg (B) 3 kg (C) 2 kg (D) 2.5 kg
  16. The decreases in the potential energy of a ball of mass 25 kg which falls from a height of 40 cm is    (A) 968 J (B) 100 J (C) 1980 J (D) 200 J
  17. If a man increase his speed by 2 m/s, his K.E. is doubled, the original speed of the man is?
  18. If the force F is applied on a body and it moves with a velocity v, the power will be?
  19. A ball is allowed to fall from a height 20m. If there is 30% loss of energy due to impact, then after one impact ball will go up to                                                                                                                  (A) 18 m (B) 16 m (C) 12 m (D) 14 m
  20. If a skater of weight 4 kg has initial speed 40 m/s and 2nd one of weight 6 kg has 6 m/s. After collision, they have speed (couple) 6 m/s. Then the loss in K.E. is.....                                              (A) 48 J (B) zero (C) 96 J (D) None of these
  21. A metal ball of mass 2 kg moving with a velocity of 36 km/h has a head on collision with a stationary ball of mass 3 kg. If after the collision, the two balls move together, the loss in kinetic energy due to collision is                                                                                                                                     (A) 40 J (B) 60 J (C) 100 J (D) 140 J

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