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DEPARTMENT OF PHYSICS, , Physics, , , , Time : 1.00 hr xil Marks : 20, , , , Description Of Motion In One Dimension |, , , , , , 1), , 2), , 3), , 4), , 5), , 6), , The position of a particle moving along the x-axis at certain times is given below : Which of, the following describes the motion correctly, , , , , , , , , , , , , , , , , , , , tts) ° a 2 3, x(m) -2 9 6 6, A) Uniform, accelerated B) Uniform, decelerated, C) Non-uniform, accelerated D) There is not enough data for, , generalization, , Consider the acceleration, velocity and displacement of a tennis ball as it falls to the ground, and bounces back. Directions of which of these changes in the process, , A) Velocity only B) Displacement and velocity, , C) Acceleration, velocity and displacement D) Displacement and acceleration, , A body A starts from rest with an acceleration a, . After 2 seconds, another body B starts, from rest with an acceleration uz . If they travel equal distances in the Sth second, after the, start of A, then the ratlo a; : az is equal to, , A)5:9 B)5:7 C)9:5 D)9:7, , The velocity of a bullet is reduced from 200m/s to 100m/s while travelling through a wooden, block of thickness 10cm. The retardation, assuming It to be uniform, will be, , A) 10 = 104 mis? B) 12 x 10* mis? C) 13.5 x 10% mis? D) 15 = 104 mis?, , A particle starts from rest, accelerates at 2 m/s” for 10s and then goes for constant speed for, 30s and then decelerates at 4 m/s? till it stops. What is the distance travelled by it, , A) 750m B) 800 m Cc) 700m D) 850m, , The engine of a motorcycle can produce a maximum acceleration 5 m/s*. Its brakes can, produce a maximum retardation 10 m,‘s®. What is the minimum time in which it can cover a, distance of 1.5 km, , A) 30 sec B) 15sec C) 10 sec D) 5 sec, The path of a particle moving under the influence of a force fixed in magnitude and direction is, , A) Straight line B) Circle C) Parabola D) Ellipse

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8) Abody A moves with a uniform acceleration « and zero initial velocity. Another body B,, starts from the same point moves in the same direction with a constant velocity v. The two, bodies meet after a time t. The value of t is, , 2v v v wr, A) = B) a c) Sa D) \ 2a, , 9) A particle moves along X-axis in such a way that its coordinate X varies with time t according, to the equation x = (2— 51 + 6t®) m. The initial velocity of the particle is, , A) —5 m/s B) 6 m/s C) -3 m/s D) 3m/s, , 10) A car starts from rest and moves with uniform acceleration a on a straight road from time t = 0, to t = T. After that, a constant deceleration brings it to rest. In this process the average speed, of the car is, , 3aT, 2, , 11) An object accelerates from rest to a velocity 27.5 m/s in 10 sec then find distance covered by, object in next 10 sec, , at B) o> D) aT, , A) 550m B) 137.5m C)412.5m D) 275m, , 12) Starting from rest, acceleration of a particle is a = 2{t — 1). The velocity of the particle at t=5s, is, , A) 15 msec B) 25 m/sec C) 5 m/sec D) None of these, , 13) A body is moving with uniform acceleration describes 40 m in the first 5 sec and 65 m in next, 5 sec. Its initial velocity will be, , A) 4mis B) 2.5 mis C) 5.5 mis D) 11 ms, , 14) Speed of two identical cars are u and 4u at a specific instant. The ratio of the respective, distances in which the two cars are stopped from that instant is, , A)1:1 B)1:4 c)1:8 D) 1:16, , 15) The displacement x of a particle varies with time t,x = ae “ + be*, where a, b, nandp are, positive constants. The velocity of the particle will, , A) Go on decreasing with time B) Be Independent of « and (5, , C) Drop to zero when « = 6 D) Go on increasing with time, , 16) Two trains, each 50 m long are travelling in opposite direction with velocity 10 m/s and 15, m/s. The time of crossing is, , vi ~ V2, , A) 2s B) 4s C) 2V3s D)t=

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17) A 120 m long train is moving in a direction with speed 20 m/s. A train B moving with 30 m/s in, the opposite direction and 130 m long crosses the first train in a time, , A)6s B) 36s C)38s D) None of these, , 18) A police jeep is chasing with, velocity of 45 km/h a thief in another jeep moving with velocity, 153 km/h. Police fires a bullet with muzzle velocity of 180 m/s. The velocity it will strike the car, of the thief is, , A) 150 m’s B) 27 mis C) 450 mis D) 250 mis, , 19) A boat is sent across a river with a velocity of 8 km/hr. If the resultant velocity of boat is 10, km/hr, then velocity of the river is :, , A) 10 km/hr B) 8 km/hr C) 6 km/hr D) 4km/h, , 20) A boat moves with a speed of 5 km/h relative to water in a river flowing with a speed of 3 km/h, and having a width of 1 km. The minimum time taken around a round trip is, , A) 5 min B) 60 min C) 20 min D) 30 min