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DEPARTMENT OF PHYSICS, , Physics, Time : 1.00 hr xil Marks : 20, Description Of Motion In One Dimension, , 1) Aman throws a ball vertically upward and it rises through 20 m and returns to his hands., What was the initial velocity (u) of the ball and for how much time (T) it remained in the air, , , , g = 10m/s?|, A) u=10 m/s, T= 2s B)u=10mis,T=4s, C) u=20 mis, T= 2s D) u=20m/s,T=4s, , 2) A particle when thrown, moves such that it passes from same height at 2 and 10s, the height, Is, A)g B) 2g C) 5g D) 10g, , 3) Three different objects of masses im, m: and my are allowed to fall from rest and from the, same point "O” along three different frictionless paths. The speeds of the three objects, on, reaching the ground, will be in the ratio of, , 1 1 1, A) m, : mg: mg B) m, : 2m, : 3m, Cpt:i:1 Oo) —:—:—, my m2 ms, , 4) Two balls A and B of same masses are thrown from the top of the building. A, thrown upward, with velocity V and B, thrown downward with velocity V, then, , A) Velocity of A is more than B at the ground, B) Velocity of B is more than A at the ground, C) Both A & B strike the ground with same velocity, , D) None of these, , 5) A ball is dropped from top of a tower of 100m height. Simultaneously another ball was thrown, upward from bottom of the tower with a speed of 50 m/s(g = 10m/s*). They will cross each, other after, , A) is B) 2s C) 3s D) 4s, 6) Accricket ball is thrown up with a speed of 19.6 ms~'. The maximum height it can reach is, A)9.8m B) 19.6 m C) 29.4m D) 39.2m, , 7) A packet is dropped from a balloon which is going upwards with the velocity 12 m’s, the, velocity of the packet after 2 seconds will be, , A) -12 m/s B) 12 mis C) -7.6 mis D) 7.6 mis

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8) The effective acceleration of a body, when thrown upwards with acceleration a will be :, , A) /a-g? B) a? + 9? C) (a-g) D) (a +g), , 9) A body is thrown vertically upwards with velocity u. The distance travelled by it in the fifth, and the sixth seconds are equal. The velocity u is given by (g = 9.8 m/s”), , A) 24.5 m’s B) 49.0 mis C) 73.5 mis D) 98.0 mis, , 10) From the top of a tower two stones, whose masses are in the ratio 1 : 2 are thrown one, , straight up with an initial speed u and the second straight down with the same speed u. Then,, neglecting air resistance, , A) The heavier stone hits the ground with a higher speed, B) The lighter stone hits the ground with a higher speed, C) Both the stones will have the same speed when they hit the ground., , D) The speed can"t be determined with the given data., , 11) When a ball is thrown up vertically with velocity V, , it reaches a maximum height of “h". If, one wishes to triple the maximum height then the ball should be thrown with velocity, , A) v3V. B) 3V,, C) 9vV, D) 3/2v,,, , 12) A particle starts from rest. Its acceleration (a) versus time (t) is as shown in the figure. The, maximum speed of the particle will be, , A) 110 ms B) 55 m's C) 550 mis D) 660 mis, , 13) A car accelerates from rest at a constant rate « for some time, after which it decelerates at a, constant rate Sand comes to rest. If the total time elapsed is f, then the maximum velocity, acquired by the car Is, , a (SE), 5 (=—"): c) ast D) oe, , 14) If a ball is thrown vertically upwards with speed u, the distance covered during the last t, seconds of its ascent is, , , , , , , , , , 1, 2, 15) A small block slides without friction down an inclined plane starting from rest. Let S,, be the, , distance travelled from time t = n—1 tot = n. Then —"- is, , met, , A) 5 B) ut — Sgt? C) (u—gt)t D) utd

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2n—1 2n+1 2n—1 2n, a Bont Oenat Dati, 16) For the velocity-time graph shown in figure below the distance covered by the body in last, two seconds of its motion is what fraction of the total distance covered by It in all the seven, seconds, ts} —, , ‘, , 1 1 1 2, A) 2 B) a Cc) 3 Dd) 3, 17) Velocity-time curve for a body projected vertically upwards is, A) Parabola 8) Ellipse C) Hyperbola D) Straight line, , 18) An object is moving with a uniform acceleration which is parallel to its instantaneous, direction of motion. The displacement velocity (v) graph of this object is, > ee, , 19) A particle moves along the sides AB, BC, CD of a square of side 25 m with a velocity of 15, ms‘. Its average velocity is, , A) 15ms * B) 10ms! C)7.5ms* D) Sms!, , 20) A body has speed V, 2V and 3V in first 1/3 of distance S, seconds 1/3 of S and third 1/3 of S, respectively. Its average speed will be, AV B) 2v c) 38, , 11, Ti’ D) ia”