JEE Questions for Physics Motion In A Straight Line Quiz 3 - MCQExams.com

A car moves from X to Y with a uniform speed vu and returns to Y with a uniform speed vd . The average speed for this round trip is

  • Physics-Motion in a Straight Line-81354.png
  • 2)
    Physics-Motion in a Straight Line-81355.png

  • Physics-Motion in a Straight Line-81356.png

  • Physics-Motion in a Straight Line-81357.png
A body of mass 10 kg is moving with a constant velocity of 10 ms-1 . When a constant force acts for 4 s on it, it moves with a velocity 2 ms-1 in the opposite direction. The acceleration produced in it is
  • 3 ms-1
  • -3 ms-1
  • 0.3 ms-1
  • -0.3 ms-1
A particle moves along a straight line OX. At a time t (in second) the distance x (in metre) of the particle from O is given by x = 40 + 12t – t3 . How long would the particle travel before coming to rest?
  • 24 m
  • 40 m
  • 56 m
  • 16 m
A bullet comes out of the barrel of gun of length 2 m with a speed ms-1. The average acceleration of the bullet is
  • 1.6 ms-2
  • 160 ms-2
  • 1600 ms-2
  • 16 ms-2
A body is moving with uniform acceleration covers 200 m in the first 2 s and 220 m in the next 4 s. Find the velocity in ms-1 after 7 s.
  • 10
  • 15
  • 20
  • 30
From the top of tower a body A is projected vertically up, another body B is horizontally thrown and a third body C is thrown vertically down with same velocity. Then,
  • B strikes the ground with more velocity
  • C strikes the ground with less velocity
  • A, B and C strike the ground with same velocity
  • A and C strike the ground with more velocity than B
A body is released from a great height, falls freely towards the earth. Another body is released from the same height exactly a second later. Then, the separation between two bodies, 2 s after the release of the second body is nearly
  • 15 m
  • 20 m
  • 25 m
  • 30 m
A particle moving with a uniform acceleration travels 24 m and 64 m in the first two consecutive interval of 4 s each. Its initial velocity will be
  • 5 ms-1
  • 3 ms-1
  • 4 ms-1
  • 1 ms-1
A source of constant voltage V is connected to a resistance R and two ideal inductors L1 and L2 through a switch S as shown. There is no mutual inductance between the two inductors. The switch S is initially open. At t = 0, the switch is closed and current begins to flow. Which of the following options is/are correct?
Physics-Motion in a Straight Line-81366.png

  • Physics-Motion in a Straight Line-81367.png
  • 2)
    Physics-Motion in a Straight Line-81368.png
  • The ratio of the currents through L1 and L2 is fixed at all times (t > 0)

  • Physics-Motion in a Straight Line-81369.png
An automobile travelling with a speed of 60 kmh-1, can brake to stop within a distance of 20 m. If the car is going twice as fast, i.e. 120 kmh-1, the stopping distance will be
  • 20 m
  • 40 m
  • 60 m
  • 80 m
A particle located at x = 0 at time t = 0, starts moving along the positive x–direction with a velocity v that varies as v = α√x. The displacement of the particle varies with time as

  • Physics-Motion in a Straight Line-81372.png
  • t

  • Physics-Motion in a Straight Line-81373.png

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A metro train starts from rest and in 5 s achieves 108 kmh-1. After that it moves with constant velocity and comes to rest after travelling 45 m with uniform retardation. If total distance travelled is 395 m, find total time of travelling.
  • 12.2 s
  • 15.3 s
  • 9 s
  • 17.2 s

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  • Physics-Motion in a Straight Line-81378.png
  • 2)
    Physics-Motion in a Straight Line-81379.png

  • Physics-Motion in a Straight Line-81380.png
  • Zero

Physics-Motion in a Straight Line-81382.png

  • Physics-Motion in a Straight Line-81383.png
  • 2)
    Physics-Motion in a Straight Line-81384.png

  • Physics-Motion in a Straight Line-81385.png

  • Physics-Motion in a Straight Line-81386.png
A bullet moving with a speed of 100 ms-1 can just penetrate two planks of equal thickness. Then, the number of such planks penetrated by the same bullet when the speed is doubled will be
  • 6
  • 10
  • 4
  • 8
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 s. The height of the balloon when the stone was dropped from it is ( take,g = 9.8 ms-2 )
  • 400 m
  • 150 m
  • 100 m
  • 200 m
From the top of a tower, two stones, whose masses are in the ratio 1 : 2 are thrown on straight up with an initial speed u and the second straight down with the same speed u. Then, neglecting air resistance
  • the heavier stone hits the ground with a higher speed
  • the lighter stone hits the ground with a higher speed
  • both the stones will have the same speed when they hit the ground
  • the speed cannot be determined with the given data
From a balloon rising vertically upwards 5 ms-1 at stone is thrown up at 10 ms-1 relative to the balloon. Its velocity w.r.t. ground after 2 s is (assume, g = 10 ms-2)
  • zero
  • -5 ms-1
  • 10 ms-1
  • 20 ms-1
A balloon going upward with a velocity of 12 ms-1 is at a height of 65 m from the earth's surface at any instant. Exactly at this instant a ball drops from it. How much time will the ball take in reaching the surface of the earth? (Take, g = 10 ms-2)
  • 5 s
  • 6 s
  • 10 s
  • None of these
A body dropped from top of a tower fall through 60 m during the last 2s of its fall. The height of tower is (take,g = 10 ms-2)
  • 95 m
  • 60 m
  • 80 m
  • 90 m

Physics-Motion in a Straight Line-81394.png

  • Physics-Motion in a Straight Line-81395.png
  • 2)
    Physics-Motion in a Straight Line-81396.png

  • Physics-Motion in a Straight Line-81397.png

  • Physics-Motion in a Straight Line-81398.png
A car starting from rest, accelerates at the rate a through a distance s, then continues at constant speed for time t and then decelerates at the rate a/2 to come to rest. If the total distance travelled is 15 s, then
  • s = at
  • 2)
    Physics-Motion in a Straight Line-81400.png

  • Physics-Motion in a Straight Line-81401.png
  • None of these
A parachutist after bailing out falls 50 m without friction. When parachute opens, it decelerates at 2 ms-2. He reaches the ground with a speed of 3 ms-1. At what height, did he bail out ?
  • 91 m
  • 182 m
  • 293 m
  • 111m
A car is travelling at 72 kmh-1 and is 20 m from a barrier when the driver puts on the brakes. The car hits the barrier 2 s later. What is the magnitude of the constant deceleration?
  • 7.2 ms-2
  • 10 ms-2
  • 36 ms-2
  • 15 ms-2
The area under acceleration-time graph gives
  • distance in travelled
  • change in acceleration
  • force acting
  • change in velocity
A man is 45 m behind the bus, when the bus starts accelerating from rest with acceleration 2.5 ms-2. With what minimum velocity should the man start running to catch the bus?
  • 12 ms-1
  • 14 ms-1
  • 15 ms-1
  • 16 ms-1
A particle moves along X–axis as x = 4(t –+ a (t – 2)2. Which of the following is true?
  • The initial velocity of particle is 4
  • The acceleration of particle is 2a
  • The particle is at origin at t = 0
  • None of these
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 of 4.5 m/s and 7.5 m/s, respectively. The average speed of particle during this motion is
  • 4 m/s
  • 5 m/s
  • 5.5 m/s
  • 4.8 m/s
A cyclist starts from the centre 0 of a circular park of radius 1km, reaches the edge P of the park, then cycle along the circumference and returns to the point 0 as shown in figure. If the round trip takes 10 min, the net displacement and average speed of the cyclist (in metre and kilometre per hour) are
Physics-Motion in a Straight Line-81409.png
  • 0 , 1
  • 2)
    Physics-Motion in a Straight Line-81410.png

  • Physics-Motion in a Straight Line-81411.png
  • 0 , 21.4
  • 0 , 24.14
A rocket is moving in a gravity free space with a constant acceleration of 2 ms-2 along + x-direction (see figure). The length of a chamber inside the rocket is 4 m. A ball is thrown from the left end of the chamber in + x-direction with a speed of 0.3 m/s relative to the rocket. At the same time, another ball is thrown in - x-direction with a speed of 0.2 m/s from its right end relative to the rocket. The time (in seconds) when the two balls will hit each other is
Physics-Motion in a Straight Line-81413.png
  • 2 or 8
  • 3
  • 6
  • 9
0:0:1


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