NEET Physics Motion Under Gravity MCQs Set 01

Question.  A body is thrown upwards and reaches half of its maximumheight. At that position
(a) its acceleration is constant
(b) its velocity is zero
(c) its velocity is maximum
(d) its acceleration is minimum

Answer: A

Question. Velocity-time curve for a body projected vertically upwards is
(a) straight line
(b) ellipse
(c) parabola
(d) hyperbola

Answer: A

Question. An object accelerated downward under the influence of force of gravity. The motion of object is said to be
(a) free fall
(b) uniform motion
(c) non uniformly accelerated motion
(d) None of these

Answer: A

Question. Free fall of an object (in vacuum) is a case of motion with
(a) uniform acceleration
(b) uniform velocity
(c) variable acceleration
(d) constant momentum

Answer: A

Question. A ball thrown vertically upwards after reaching a maximum height h, returns to the starting point after a time of l0 s. Its displacement is
(a) zero
(b) 10 h
(c) 2 h
(d) h

Answer: A

Question. The ball is projected up from ground with speed 30 m/sec. What is the average velocity for time 0 to 4 sec?
(a) 10 m/sec
(b) 15 m/sec
(c) 20 m/sec
(d) zero

Answer: A

Question. A body is thrown vertically upwards with a velocity u. Select the incorrect statements from the following.
I. Both velocity and acceleration are zero at its highest point.
II. Velocity is maximum and acceleration is zero at the highest point.
III. Velocity is maximum and acceleration is g downwards at its highest point.
(a) I, II and III
(b) II and III
(c) I and II
(d) I and III

Answer: A

Question. Two balls A and B of same mass are thrown from the top of the building. A thrown upward with velocity v and B, thrown down with velocity v, then
(a) both A &B strike the ground with same velocity
(b) velocity of B is more than A at the ground
(c) velocity A is more than B at the ground
(d) None of these

Answer: A

Question. A rocket is fired upward from the earth’s surface such that it creates an acceleration of 19.6 ms^-2 . If after 5 s, its engine is switched off, the maximum height of the rocket from earth’s surface would be
(a) 735 m
(b) 490 m
(c) 245 m
(d) 980 m

Answer: A

Question. A man throws balls with same speed vertically upwards one after the other at an interval of 2 sec. What should be the speed of throw so that more than two balls are in air at any time ?
(a) More than 19.6 m/s
(b) Only with speed 19.6 m/s
(c) At least 9.8 m/s
(d) Any speed less then 19.6 m/s.

Answer: A

Question.  A ball is dropped from a high rise platform at t = 0 starting from rest. After 6 seconds another ball is thrown downwards from the same platform with a speed v. The two balls meet at t = 18s. What is the value of v?
(take g = 10 m/s²)
(a) 75 m/s
(b) 55 m/s
(c) 40 m/s
(d) 60 m/s

Answer: A

Question.  From a building two balls A and B are thrown such that A is thrown upwards and B downwards (both vertically). If T_A and T_B are their respective time of flights then
(a) T_A > T_B
(b) T_A = T_B
(c) their time of flights depend on their masses
(d) None of these

Answer: B

Question.  If two balls of masses m₁ and m₂(m₁= 2m₂) are dropped from the same height, then the ratio of the time taken by them to reach the ground will be
(a) 1 : 1
(b) 1 : 2
(c) m₁ : m₂
(d) None of these

Answer: A

Question. A boy standing at the top of a tower of 20m height drops a stone. Assuming g = 10 ms^–2, the velocity with which it hits the ground is
(a) 20.0 m/s
(b) 40.0 m/s
(c) 5.0 m/s
(d) 10.0 m/s

Answer: A

Question. What will be the ratio of the distances moved by a freely falling body from rest on 4th and 5th seconds of journey ?
(a) 7 : 9
(b) 16 : 25
(c) 1 : 1
(d) 4 : 5

Answer: A

Question.  A ball released from a height falls 5 m in one second. In 4 seconds it falls through
(a) 80 m
(b) 40 m
(c) 1.25 m
(d) 20 m

Answer: A

Question. From a balloon moving upwards with a velocity of 12 ms ^-1, a packet is released when it is at a height of 65 m from the ground. The time taken by it to reach the ground is (g = 10 ms^–2)
(a) 5 s
(b) 8 s
(c) 4 s
(d) 7 s

Answer: A

Question.  A ball is dropped from the top of a tower of height 100 m and at the same time another ball is projected vertically upwards from ground with a velocity 25 ms^–1. Then the distance from the top of the tower, at which the two balls meet is
(a) 78.4 m
(b) 18.4 m
(c) 48.4 m
(d) 68.4 m

Answer: A

Question. A body released from the top of a tower falls through half the height of the tower in 2 s. In what time shall the body fall through the height of the tower ?
(a) 2.828 s
(b) 3.48 s
(c) 3.26 s
(d) 4 s

Answer: A

Question.  A stone falls from a balloon that is descending at a uniform rate of 12 m/s. The displacement of the stone from the point of release after 10 sec is
(a) 610 m
(b) 725 m
(c) 510 m
(d) 490 m

Answer: A

Question.  The ratio of distances traversed in successive intervals of time when a body falls freely under gravity from certain height is
(a) 1 : 3 : 5
(b) 1 : 2 : 3
(c) 1 : 5 : 9
(d) None of these

Answer: A

Question. A body dropped from top of a tower fall through 40 m during the last two seconds of its fall. The height of tower is (g = 10 m/s2)
(a) 45 m
(b) 80 m
(c) 50 m
(d) 60 m

Answer: A

Question.  A stone thrown upward with a speed u from the top of the tower reaches the ground with a velocity 3u. The height of the tower is
(a) 4u²/g
(b) 6u²/g
(c) 9u²/g
(d) 3u²/g

Answer: A

Question.  From a pole of height 10 m, a stone is thrown vertically upwards with a speed 5 m/s. The time taken by the stone, to hit the ground, is n times that taken by it to reach the highest point of its path. The value of n is [take g = 10 m/s²]
(a) 4
(b) 5
(c) 3
(d) 2

Answer: A