This sèction contain 4 multiple correct answer(s) type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or-MORE are correct is/are correct.
9. water coming out of a horizontal tube at a speed strikes normally a vertically wall close to the mouth of the tube and falls down vertically after impact. When he speed of water is increased to .
(a) The thrust exerted by water on the wall
will be doubled
(b) The thrust exteerted by the water on the wall will be four times ‘ -‘
(c) The energy lost per second by water strike tip the wall will also be our times
(d) The energy lost per second by water striking the wall will be increased eight times.
1O. A block is thrown with. a velocity of 2 m s-1 (relative to ground)on a belt which is moving with velocity 4 m s-1 in opposite direction of the initial velocity of block. If the block stops slipping on the belt after 4 sec of the throwing then choose the correct statement (s)
(a) Displacement with respect to ground is zero after 2.66 sec and magnitude of displacement with respect to ground is 12h after 4sec
(b) Magnitude of displacement with respect to ground in 4sec is 4m
(c) Magnitude of displacement with respect to belt in 4sec 12 m
(d) Displacement with respect to ground is zero in 8/3 sec
11.Heat is supplied to a certain homogeneous sample of matter at a uniform rate. Its temperature is plotted against time as shown in figure which of the following conclusion can be drawn.?
(a) Its specific heat capacity is grater in the solid than in the liquid state
(b). Its specific heat capacity is greater in the liquid state than in the solid state
(c) Its latent heat of vaporization is greater than its latent heat of ‘fusion
(d) Its latent of vaporization is smaller than its latent heat of fusion.
12. A machine, in an amusement park, consists of a cage at the end of one arm, hinged at O. The cage revolves along a-vertical circle of radius r(ABCDEFGH) about its hinge , at constant linear speed . The case is so attached that the man of weight ‘w’ standing on a weighing machine, inside the cage, is always vertical. Then which of the following is correct
(a) the weight reading at A is greater than the weight reading at E by 2w
(b) the weight reading at G = w
(c) the ratio of the weight reading at E to that at A =0
(d) the ratio of the weight reading at A to that at C = 2.