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DEPARTMENT OF PHYSICS, , Physics, , , , Time : 1.00 hr Xi Marks : 20, , , , Description Of Motion In One Dimension |, , , , , , 1) A particle is dropped from a height of 3.46958 m. In what time the particle would travel the, first metre distance ? (Given : g = 10m s~*), , A) 172s B) \/1/3s C)1/2s D) \/1/5s, , , , 2) The acceleration of a particle increases linearly with time t as "6t" . If the initial velocity of the, particle is zero and the particle starts from the origin, then the distance travelled by the, particles in time t will be :, , Ajt B) +? c) +3 D) «*, , 3) The position vector of a particle in SI units is 7 = 4t7i + 3t*j + 2k . The acceleration of particle, Is:, Ayams? B)3ms"2 C)2ms@ D) 10ms~2, , 4) A body moving with uniform retardation covers 3 km before its speed is reduced to half, it, comes to rest after travelling a distance of :, , A) 1km B)2km c)3 km D) 4km., , 5) The relation between time t and distance x is given by | = ax? + bx . Where a, b are constants., Then retardation is :, , A) 2av3 B) 2afiv® C) 2p D) 2ap, , 6) A person moves 30 m north and then 20 m towards east and finally 30\/2 min south-west, direction. The displacement of the person from the origin will be, , A) 10 m along north B) 10 m long south C) 10 m along west D) Zero, , 7) An aeroplane flies 400 m north and 300 m south and then flies 1200 m upwards then net, displacement is, , A) 1200 m B) 1300 m C) 1400 m D) 1500 m, , 8) An athlete completes one round of a circular track of radius R in 40 sec. What will be his, displacement at the end of 2 min. 20 sec, , A) Zero B) 2R C) 2nk D) 7nR, , 9) The displacement-time graph for two particles A and B are straight lines inclined at angles of, 30” and 60” with the time axis. The ratio of velocities of V, : V; is, , A)1:2 B)1: v3 C) v3:1 D) 1:3
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10) Which of the following is a one dimensional motion, A) Landing of an aircraft B) Earth revolving a round the sun, , C) Motion of wheels of a moving trains D) Train running on a straight track, , 11) A150 m long train is moving with a uniform velocity of 45 km/h. The time taken by the train to, cross a bridge of length 850 meters is, , A) 56 sec B) 68 sec C) 80 sec D) 92 sec, , 12) A particle is constrained to move on a straight line path. It returns to the starting point after, 10 sec. The total distance covered by the particle during this time is 30 m. Which of the, following statements about the motion of the particle is false, , A) Displacement of the particle is zero B) Average speed of the particle is 3 m/s, , C) Displacement of the particle is 30 m D) Both (a) and (b), , 13) A particle moves along a semicircle of radius 10m in 5 seconds. The average velocity of the, particle is, , A) 20 ms"! B) 4x ms"? c)2ms* D) 4 ms"?, , 14) A man walks on a straight road from his home to a market 2.5 km away with a speed of 5, km'h. Finding the market closed, he instantly turns and walks back home with a speed of 7.5, kmh. The average speed of the man over the interval of time 0 to 40 min. is equal to, , A) 5S km/h B) = km/h c) = km/h D) : km/h, , 15) A person travels along a straight road for the first half time with a velocity v; and the next half, time with a velocity v2 . The mean velocity V of the man is, 2 1 1 Va to — (vy, ==—+4+— f= f= Ave =,/—, A) vw + ag B) Vv 2 C)V= ie DV Vv, 16) If a car covers 2/5'" of the total distance with v; speed and 3/5'" distance with v2 then average, speed is, , _—, A) avvive B), , , , Va te 2viv2 Svive, 2 o v1 +Ve2 D) Buy + 2vo, 17) Which of the following options is correct for the object having a straight line motion, represented by the following graph
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A) The object moves with constantly increasing velocity from O to A and then it moves with, constant velocity., , B) Velocity of the object increases uniformly, C) Average velocity is zero, , D) The graph shown is impossible, 18) The numerical ratio of displacement to the distance covered is always, , A) Less than one B) Equal to one, , C) Equal to or less than one D) Equal to or greater than one, , 19) A particle moves for 20 seconds with velocity 3 m/s and then velocity 4 m/s for another 20, seconds and finally moves with velocity 5 m/s for next 20 seconds. What is the average, velocity of the particle, , A) 3mis B) 4mis c)5mis D) Zero, , 20) A bullet fired into a fixed target loses half of its velocity after penetrating 3 cm. How much, further it will penetrate before coming to rest assuming that it faces constant resistance to, motion?, , A) 1.5 cm B) 1.0 cm C) 3.0 cm D) 2.0 cm