JEE Questions for Physics Motion In A Straight Line Quiz 14 - MCQExams.com

A rocket is fired upward from the earth\'s surface such that it creates an acceleration of 19.6 m/sec2. If after 5 sec its engine is switched off, the maximum height of the rocket from earth\'s surface would be
  • 245 m
  • 490 m
  • 980 m
  • 735 m
A bullet is fired with a speed of 1000 m/sec in order to hit a target 100 m away. If g = 10 m/sec2, the gun should be aimed
  • Directly towards the target
  • 5 cm above the target
  • 10 cm above the target
  • 15 cm above the target
A body starts to fall freely under gravity. The distances covered by it in first, second and third second are in ratio
  • 1 : 3 : 5
  • 1 : 2 : 3
  • 1 : 4 : 9
  • 1 : 5 : 6
P, Q and R are three balloons ascending with velocities U , 4U and 8U respectively. If stones of the same mass be dropped from each, when hey are at the same height then
  • They reach the ground at the same time
  • Stone from P reaches the ground first
  • Stone from R reaches the ground first
  • Stone from Q reaches the ground first
A body is projected up with a speed \'u\' and the time taken by it is T to reach the maximum height H. Pick out the correct statement
  • It reaches H/2 in T/2 sec
  • It acquires velocity u/2 in T/2 sec
  • Its velocity is u/2 at H/2
  • Same velocity at 2T
A body falling for 2 sec covers a distance S equal to that covered in next second. Taking g = 10 m/s2, S is equal to
  • 30m
  • 10m
  • 60m
  • 20m
A ball of mass m1 and another ball of mass m2 are dropped from equal height. If time taken by the balls are t1 and t2 respectively, then

  • Physics-Motion in a Straight Line-82021.png
  • 2)
    Physics-Motion in a Straight Line-82022.png

  • Physics-Motion in a Straight Line-82023.png

  • Physics-Motion in a Straight Line-82024.png
A body sliding on a smooth inclined plane requires 4 sec to reach the bottom starting from rest at the top. How much time does it take to cover one-fourth distance from rest at the top?
  • 1 s
  • 2 s
  • 4 s
  • 16 s
A ball is dropped downwards. After 1 sec another ball is dropped downwards from the same point. What is the distance between them after 3 sec?
  • 25 m
  • 20 m
  • 508 m
  • 9.87 m
A stone is shot straight upward with a speed of 20 m/sec from a tower 200 m high. The speed with which it strikes the ground is approximately
  • 60 m/sec
  • 65 m/sec
  • 70 m/sec
  • 75 m/sec
A body freely falling from the rest has a velocity \'v\' after it falls through a height \'h\'. The distance it has to fall down for its velocity to become double, is
  • 2 h
  • 4 h
  • 6 h
  • 8 h
A body thrown vertically upwards with an initial velocity u reaches maximum height in 6 sec. he ratio of the distances travelled by the body in the first second and the seventh second is
  • 1 : 1
  • 11 : 1
  • 1 : 2
  • 1 : 11
A body thrown upwards with some velocity, reaches the maximum height of 20 m. Another body with double the mass thrown up, with double initial velocity will reach a maximum height of
  • 200 m
  • 16 m
  • 80 m
  • 40 m
A balloon starts rising from the ground with an acceleration of 1.25 ms2 after 8s, a stone is released from the balloon. The stone will (g = 10 ms2)
  • Reach the ground in 4 sec
  • Begin to move down after being released
  • Have a displacement of 50 m
  • Cover a distance of 40 m in reaching the ground
A body is thrown vertically upwards with a velocity u. Fins the true statement from the following
  • Both velocity and acceleration are zero at its highest point
  • Velocity is maximum and acceleration is zero at the highest point
  • Velocity is maximum and acceleration is g downwards at its highest point
  • Velocity is zero at the highest point and maximum height reached is u2/2g
A man throws a ball vertically upward and it rises through 20 m and returns to his hands. What was the initial velocity (u) of the ball and for how much time (T) it remained in the air (g = 10 m/s2)
  • u = 10 m/s, T = 2s
  • u = 10 m/s, T = 4s
  • u = 20 m/s, T = 2s
  • u = 20 m/s, T = 4s
A particle when thrown, moves such that it passes from same height at 2 and 10 s, the height is
  • g
  • 2g
  • 5g
  • 10g
Two balls A and B of same masses are thrown from the top of the building. A, thrown upwards with velocity V and B, thrown downward with velocity V, then
  • Velocity of A is more than B at the ground
  • Velocity of B is more than A at the ground
  • Both A and B strike the ground with same velocity
  • None of the above
A ball is dropped from top of a tower of 100 m height. Simultaneously another ball was thrown upward from bottom od the tower with a speed of 50 m/s (g = 10 m/s2) . They will cross each other
  • 1 s
  • 2 s
  • 3 s
  • 4 s
A very large number of balls are thrown vertically upwards in quick succession in such a way that the next ball is thrown when the previous one is at the maximum height. If the maximum height is 5m, the number of ball thrown per minute is (take g = 10 m/s2)
  • 120
  • 80
  • 60
  • 40
A body falls from rest in the gravitational field of the earth. The distance travelled in the fifth second of its motion is (g = 10 m/s2)
  • 25 m
  • 45 m
  • 90 m
  • 125 m
A balloon is rising vertically up with a velocity of 29 ms–1. A stone is dropped from it and it reaches the ground in 10 sec. The height of the balloon when the stone was dropped from it is (g = 9.8 m/s2)
  • 100 m
  • 200 m
  • 400 m
  • 150 m
A ball is released from the top of a tower of height h meters. It takes T sec to reach the ground. What is the position of the ball in T/3 sec?
  • h/9 m from he ground
  • 7h/9 m from the ground
  • 8h/9 from the ground
  • 17h/18 m from the ground
Two balls of same size but the density of one is greater than that of other are dropped from the same height, then which ball will reach the earth first (air resistance is negligible)
  • Heavy ball
  • Light ball
  • Both simultaneously
  • Will depend upon the density of the balls
A body is thrown vertically upwards with velocity u. The distance travelled by it in the fifth and the sixth sec are equal. The velocity u is given by (g = 9.8 m/s2)
  • 24.5 m/s
  • 49.0 m/s
  • 73.5 m/s
  • 98.0 m/s
A body, thrown upwards with some velocity reaches the maximum height of 50 m. Another body with double the ass thrown up with double the initial velocity will reach a maximum height of
  • 100 m
  • 200 m
  • 300 m
  • 400 m
A stone falls freely from rest and the total distance covered by it in the last second of its motion equals the distance covered by it in the first three sec of its motion. The stone remains in the air for
  • 6 s
  • 5 s
  • 7 s
  • 4 s
Two identical metal spheres are released from the top of a tower after t sec of each other such that they fall along the same vertical line. If air resistance is neglected, then at any instant of time during their fall
  • The difference in their displacements remain the same
  • The difference between their speed remains the same
  • The difference between their heights above ground is proportional to t2
  • The difference between their displacements is proportional to t
Free fall of an object (in vacuum) is a case of motion with
  • Uniform velocity
  • Uniform acceleration
  • Variable acceleration
  • Constant momentum
A particle moving in a straight line covers half the distance with speed of 3 m/s. The other half of the distance is covered in two equal time intervals with speed f 4.5 m/s and 7.5 m/s respectively. The average speed of the particle during this motion is
  • 4.0 m/s
  • 5.0 m/s
  • 5.5 m/s
  • 4.8 m/s
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Physics Quiz Questions and Answers