Physics for competitive exams – 05

51. A ball is thrown from height h and another from ‘2h’ the ratio of time taken by the two balls to reach ground is 

1: square root of 2

52. The leaning tower of Pisa does not fall because the vertical line through the center of gravity of the tower falls within its base

53. A man caring load on his back bends forwards because --- to adjust the center of gravity of the system such that the vertical line to the center of gravity passes in the base

54. A bomb initially at rest explodes into a large no. of tiny fragments the total momentum of the all the fragments is 0

55. The flying of birds is a prove of --- Newton’s third law

56. A moving ball at hits the a solid target resting on a friction less surface and gets embedded in it is the conserve in this process --- momentum alone

57. Two bullets A and B are fired from the gun in the same speed but at angles 30⁰ and 60⁰ to the horizontal, respectively --- both bullets have the same horizontal range

58. If a bomb is released from a plane moving with uniform velocity then by the time the bomb reaches the ground the plane will be-----vertically above the bomb

59. The horse pull the cart because of – the force that the ground exert on the horse

60. A thin film of liquid is enclosed between two glass plates it is difficult to separate the plates on account of -surface tension