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DEPARTMENT OF PHYSICS, , Physics, Time : 1.00 hr xl Marks : 20, , , , Description Of Motion In One Dimension |, , 1) A boy throws a ball in air in such a manner that when the ball is in its max. height, he throws, another ball. If the balls are thrown after the time difference of 1 s, then what will be the height, attained by them :, , A) 19.6 m B) 9.8m Cc) 4.9m D) 2.45 m., , 2) Abody is reteseed tora the top of tomer of height h metre. It takes time T seconds to reach, the ground. Where Is the body at time 3 seconds ?, , A) At m from the ground B) At m from the ground, Cc) At 3 m from the ground D) Depends upon mass and volume of the, body., , 3) The displacement y (in metres) of a body varies with time t (in sec.) as y = Ze +36t+2., How long does the body takes to come to the rest ?, , A)8s B)10s cj)12s D) 16s, , 4) A body experiences acceleration for 6 seconds after starting from rest. If it travels a distance, x, in first 2s, x2 in the next two s, and x; in the last two s. then:, , A) xy ixgixg=t:1:1 B)xyixgixg2=1:2:3, , C) xy ixgixg21:3:5 D) xy ixgixng2=1:4:8, , 5) The velocity of a particle is given by v = 3 + 6 (a; + agt) where a; and az are constants and tis, time. The acc. of particle is :, , A) a; +42 B) 6(a,; + ap) C)6a, D) 6 a,, , 6) Ona velocity time graph of a body, the ratio of average acceleration during time interval OA, and AB is :, , VELOCITY —->, , “Ar 60, o A, TIME (t}——»
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t 1, , A)1 8); ©),, , 7) A bullet fired into a target loses half of its velocity after penetrating 36 cm. Further distance, covered by it before coming to rest will be :, , D)3, , A) 18cm B) 24cm c)12em D) 30cm, , 8) A balloon is going vertically upward with a velocity of 15ms_'. When it is at a height of 50 m, above the ground a stone is gently dropped from it. The stone ill reach the ground in time, (take g = 10 ms~*):, , A)5s B)7s C)9s D)3s, , 9) Atrain is moving with a speed of 54 km/h. A monkey is running on the roof of a train against, its motion with a speed of 5 m/s. w.r.t. the train. The velocity of the monkey as observed by a, man on the ground is :, , A) 20ms7' B)15ms"' c)10ms"! D)5ms"'., , 10) A particle moving in a st. line covers half the distance with a speed of 3 m/s. The other half of, the distance is covered in two equal time intervals with speed of 4.5 m/s and 7.5 m/s, respectively. The average speed of the particle during this motion is :, , A) 4ms"' B) 5ms~" C)5.5ms~* D) 4.5ms~', , 11) A body moves along a circular track of radius R. It starts from one end of a diameter and, reaches the other end of diameter. What |s the ratio of the distance travelled by the body to its, displacement:, , A) 2 B) 2/n ©) 20 D) z, , 12) The displacement x of a particle moving in one dimension under the action of a constant, force is related to time t by the eqn. t = x + 3, where x is in metres and t in second. What is, the displacement of particle when its velocity is zero ?, , A) zero B) 1m C) 2m D) 3m, , 13) Tennis ball is dropped on the floor from a height of 100 m. It rebounds to a height of 100 m. If, the ball was in contact with the floor for 3.16 s. then the average acceleration during the, contact Is :, , A) 700 mi s* B) 140 m/s? C) 280 mi s? D) 28 ms”, , 14) A body is dropped from a height of 125 m. If g =10 m s~® , what is the ratio of the distances, travelled by it during the first and last second of its motion :, , A)2:9 B)1:9 c)133 D)4:9.
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15) The distance x covered by a body moving in a straight line in time t is given by the relation, 2x? + 3x = t. If vis the velocity of the body at a certain instant of time, its acceleration will be :, , A) B) -3v> Cc) -24 D) -4.3, , 16) A car covers ; part of total distance with a speed of 20 km h~' and second ; part with a speed, , of 30kmh " and the last | part with a speed of 60 km h ' The average speed of the car is :, A) 55kmh! B) 37.3kmh’ C)30km bh! D) 45 kmh!, , 17) The velocity time graph of a body moving along a straight line is shown in fig. The, acceleration of the body during OA will be :, , , , , , A) zero B) 20 m/ s? C) 10 my s? D) 5m s?, , 18) A boy completes one round of a circular track of radius “R" in 40 s. What will be his, displacement at the end of 2 minutes 20 second :, , A) zero B) 2R C)7 nk D) 2k, , 19) The velocity versus time curve of a moving point is as given ahead: The maximum, acceleration is :, , <, , &, , VELOCITY (rns~"), Bes, , , , Oo 1 2 # 40 50 6 70 &, TIME IN SECOND, , A) 1 m/s? B) 2m 5? C)3 ms? D) 4m s?, 20) A car is travelling along a straight road, for the first half time with a velocity v; and for the, second half time with a velocity v2 .Then the mean velocity v of the car is :, + ve, , ive ©) 2 1 , 1 Div vi+, , A) v= vive B)v= y vy vow vz 2