Page 1 :
Mi LS SU, , Preparing World Worthy Individuals, JUNIOR_NEET — 19.09.2021 (Weekly Test), Max.Marks: 720 Time: 3 Hrs, , PHYSICS, , Two balls of different masses m, and m, are dropped from two different heights, Two different heights,, viz., a and b, the ratio of times taken by the balls to drop through these distances is, , lacb 2b:a 3) va:vb 4a? sb, , The splash is heard after 2.05 s after the stone is dropped into a well of depth 19.6 m. The velocity of, sound is, , 1) 342 mst 2)372 ms? 3) 392 ms! 4)352 ms", , A ball is released trom the top of a tower of height / meters, It takes 7’ seconds to reach the ground, Whit is the position of the ball in 7/3 seconds?, , 1) A/9 meters from the ground 2) 7/9 meters from the ground, 3) 84/9 meter from the ground 4) 17h / 18 meters from the ground, A juggler maintains four balls in motion, making each of them to rise a height of 20 m from his hand, Whiat time interval should be maintain for the proper distance between them?, 3, IpiSs 2) 43 3) 1s 4) 2s, A body is released from the top of a tower of height H metre, After 2 seconds it is stopped and then, instantaneously released. What will be its height after next 2 seconds?, 1) (H-5) metre 2) (H-10) metre 3) (H-20) metre 4) (H-40) metre, , A stone is dropped from the top of a tower of height h. After | second another stone is dropped from, the balcony 20 m below the top. Both reach the bottom simultaneously, What is the value of h? (Take, g=10 ms), , 1)3125m 2) 312.5m 3)31.25m 4)25.31m, , A ball is thrown downwards with velocity v from the top of a tower and it reaches the ground with, speed 3v. What is the height of the tower?, , Ive 2v /g 3) 4v" fe 4) 8v" /g
Page 2 :
I., , 12, , 7, , A stone is dropped from a certain height which can reach the ground in 5 sec it is stopped afler three, seconds of its fall and then is again released. The total time taken by the stone to reach the ground will, be, , lj6s 2)6.58 3)7s 4)75s, , A ball is dropped from the top of a tower 100 m high. Simultaneously another ball is thrown upward, with a speed of 50 ms’! after what time do they cross each other?, , I) Is 2)3s 3) 4s 4) 6s, , A body dropped from the top of the tower covers a distance 7x in the last second of its journey, Where, x ts the distance covered in first second. How much time does it take to reach the ground?, , 1)3s 2)4s 3) Ss 4) 6s, , The distances travelled by a body falling from rest in the first, second and third seconds are in the ratio, 1) 1:2:3 2)1:3:5 3149 4) None of these, , One body is dropped while a second body is thrown downwards with an initial velocity of 2ms, simultaneously. The separation between them is 18 metres after a time, , 1) 9s 2)4.5s 3) 18s 4) 98s, , A body is thrown vertically upwards from the top of A of a tower. It reaches the ground in t) seconds., If it is thrown vertically downwards from A with the same speed it reaches the ground in {2 seconds., If it is allowed to fall freely from A, then the time it takes to reach the ground is given by, , 1A 2) t-te 3) t= ytt, aye fe, , A ball is dropped from a bridge at a height of 176 4 m over a river, After 2s, a second ball is thrown, straight downwards. What should be the initial velocity of the second ball so that both hit the water, simultaneously?, , 1) 2.45 m/s 2)49 mis 3) 14.5 m/s 4) 24.5 m’s, , A stone is dropped from the 25" storey of a multistoreyed building and it reaches the ground in 5 sec., In the first second, it passes through how many storeys of the building? (Take g = 10 m/s”), , yl 2)2 3)3 4) None of these, , A body is projected with a velocity u. It passes through a certain point above the ground afler t) sec., The time after which the body passes through the same point during the return journey is, , \ 2 2, 1) (z-#] 2) {2-1 | 3) {=-) 4) (5-4), g g 3 g g, A cain is dropped in a lift It takes time t; to reach the floor when lift is stationary, It takes time t, , when lift is moving up with constant acceleration, then, , ltt 2u>t 3)bh>t 4)t>>b
Page 3 :
19., , 21., , 23, , 24, , 27., , A rocket is fired vertically from the ground, It moves upwards with a constant acceleration 10 m/s? for, 30 sec after which the fuel is finished. After what time from the instant of firing the rocket will acts in, the maximum height? (Take g = 10 m/s*), , 1) 30s 2) 45s 3) 60s 4) 73s, , A stone is dropped from a rising balloon at a height of 76 m above the ground and reaches the ground, m 6 sec. What was the approximate velocity of the balloon when the stone was dropped?, , 1) 52.3 m/s upwards 2) 52.3 m/s downwards, 3)5 mis 4) 9.8 m/s, , A body is dropped from a height of 100 m. At what height the velocity of the body will be equal to, one half of velocity when it hits the ground?, , 1)45m 2)35m 3) 65m 4)75m, , A body is dropped from a height 32.9 m. After it crosses half distance, the acceleration due to gravity, ceases to act. The body will hit the ground with velocity, , 1) 19.6 m/s 2)20 m/s 3) 1.96 m/s 4) 196 m/s, , A stone dropped from the top of a tower is found to travel 5.9 of the tower during the last second of, its fall. The time of fall is, , 1) 2s 2)3s 3) 4s 4) 5s, , A stone is thrown vertically upward with an initial velocity u from the top of a tower, reaches the, ground with a velocity 3u. The height of the tower is, , 1) 3ut 2) au" 3) ou" 4) Sut, & £ g £, A window is 50 cm long, A stone ts falling from a height of 40 cm above the window, It crosses the, window in, 3 2 1 4, I) =s 2) =s 3) =s 4) —s, 58 ) 73 ) 7 ) 7, A body is projected vertically upwards with a velocity of 10 ms". It reaches the maximum vertical, height h in time t. In t/2, the height covered is, h 2h 3h Sh, I= 2)— — 4) —, ) 3 ) 3 3) 4 ) 3, A food packet is dropped from a helicopter rising up with a velocity of 4 ms’! The velocity of the, packet after three seconds will be, 1)204 ms! 2)25.4 ms"!, 3) 28.4 ms" 4) 30.4 ms!, , A body is thrown upwards with velocity 100 m/s and it travels $ m in the last second of its upward, journey. If the same body is thrown upward with velocity 200 m/s, what distance will it travel in the, last second of upward journey?, , l)5m 2) 10m 3) 20m 4)25m
Page 4 :
28, , 29, , W., , 31., , 32., , 33, , 35,, , 37., , A body dropped from the top of the tower covers a distance in the last second of its journey, where h, is the distance covered in the first second. How much time does it take to reach the ground?, , 1) 3s 2)4s 3) Ss 4) 6s, , A particle ts released from rest from a tower of height 3h, The ratio of times to fall equal heights h ie, tists tis, , 1) V3-V21 23:21 34-1 4) 1(v2-1)(¥3-V2), , ‘The water drops fall at regular intervals from a tap 5 m above the ground. The third drop ts leaving, the tap at the instant of first drop touches the ground. How far above the ground is the second drop at, that instant?, , 1) 125m 2)2.50m 3)3.75m 4)4.00m, , A body dropped from a height h with initial velocity zero, strikes the ground with a velocity of 3 m/s., Another body of same mass is dropped from the same height h with an initial velocity of 4 m/s. Find, the final velocity of second mass with which tt strikes the ground, , 1) 3 m/s 2)4 ms 3) Smis 4) 12 m/s, , A boy throws a ball in air in such a manner that when the ball is at its maximum height, he throws, another ball. If the balls are thrown after the time difference of 1 sec, then what will be the height, attained by them?, , 1) 196m 2)98m 3)4.9m 4)245m, , A ball ts thrown vertically upwards from the ground G with a speed u. It reaches a point H at a height, h (lower than the maximum height) after time t). It returns to the ground after time tz from the instant, it was at H during the upward journey. Then tyt2 is equal to, , 1) 2hig 2) hig 3) 2g 4) hi4g, , A body falling freely from a given height H hits on an inclined plane in its path at a height h. As a, result of this impact, the direction of velocity becomes horizontal. For what value of h/H, the body, will take maximum time to reach the ground?, , 3, , 1 2, lIp= 2, ) ), , 3) — 4) 2, 4 5, , ml, , A ball is thrown upwards from the ground. It is at a height of 100 m in upward and downward journeys, at times ty and tz respectively. If z= 10 m/s?, then titz is equal to, , 1) 10 2)20 3) 40 4) 50, , Two bodies are thrown vertically upwards with their initial speeds in the ratio 2 : 3. The ratio of the, maximum heights reached by them and the ratio of their time taken by them to return back to the, ground respectively are, , 1)4:9and2:3 — 2)2:3and ¥2:¥3 3) ¥2:v3 and4:9 4)4:9and ¥2:V3, , A body is fired vertically upward. At half the maximum height, the velocity of the body is 10 m/s. The, maximum height raised by the body is, , 10m 2)10m 3) 15m 4)20m
Page 5 :
38, , 39, , 41., , 42, , 43., , 45., , From the top of the tower of height 400 m, a ball is dropped by a man, simultaneously from the base, of the tower, another ball is thrown up with velocity 50 m/s ; at what distance will they meet from the, base of the tower?, , 1) 100 m 2)320m, 3)80m 4) 240m, , A stone is released from the top of a tower. If its velocity at half of the height is 10 m/s, then height of, the tower is (g= 10 ms?), , 18m 2)10m 3)12m 4) 16m, , A particle is thrown vertically upward. Find its velocity so that it covers same distance in $™ and 6", seconds, , 1) 48 m/s 2) 14 m/s 3)49 mis 4)7 mis, , From the top of a tower a particle is thrown vertically downwards with a velocity of 10 m/s. The ratio, of the distances covered by it in the 3" and 2" seconds of the motion is (Take g = 10 m/s’), , 15:7 27:5 3)3:6 4)6:3, , Three different objects of masses m), m2 and m; 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)m): m2: m3 2)m:; : 2m): 3m;, 3y0:1s1 jt., m, m, m,, , A man throws some balls with the same velocity vertically upwards, one after the other at an interval, of 2 seconds. What should be the speed of the throw, so that more than two balls are in the sky at any, time (Given g = 9.8 m/s*), , 1) Equal to 9.8 m/s 2) Equal to 19.6 m/s, 3) Less than 19.6 m/s 4) More than 19.6 m/s, , If a ball ts thrown vertically upwards with speed u, the distance covered during the last ¢ seconds of, its ascent is, , lop, Ip ut 2) 38, , 3) (utgt)e 4) wie, , A ball is thrown from height h and another from 2h. The ratio of time taken by the two balls to reach, ground is, , 1) 1:2, , 2) V2:1, , 3)2:1 41-2
