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Free Online Mock Physics Multiple Choice Test on Laws motion
Sub Category : Laws motion Test : 19 Time Left :
1) A man of mass 100 kg enters a lift and selects the desired floor. The lift now accelerates upward at 0.2 m spower-2 for 2 second and then moves with constant velocity. As the lift approaches his floor, it decelerates at the same rate as it previously accelerated. The lift cables can safely withstand a tension of 2 x 10power4 N and the lift itself has mass of 500kg. How many men each of mass 100 kg, could it safely carry at one time?(1) 22 (2) 15 (3) 18 (4) 12
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2) A body slides down the length PQ of a smooth incline at angle θ from the horizontal (see Fig.181). P may be varied along the vertical line RS, so that length PQ and angle θ vary, but base length QR is kept fixed. As θ is varied from near 00 to near 900, the time of passage from P to Q (1) decreases continuously (2) increase continuously (3) first decreases, later increases (4) first increases, later decreases
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3) An iron nail is dropped from a height y1 from the level of a sand bed. It penetrated through a distance y2 in the sand before coming to rest. If m is the mass of the nail, then the average force exerted by the sand on the nail is (1) mg(y1/y2+1) (2) mg y1 (3) mg y1/y2 (4) mg (y2/y1-1)
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4) A uniform rope is moving with constant acceleration on a smooth horizontal surface. The ratio of the tension in the rope at its mid-point to the applied force is(1) 1: 2 (2) 2:1 (3) 1:1 (4) 1:infinity
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5) Fig. 182 shows a block of mass M resting on a horizontal surface. The acceleration with which a boy of mass m should climb the rope (neglect mass) so as to lift the block should be greater than (1) M/mxg (2) (M/m-1)g (3)(M/m+1)g (4) mg/M
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