JEE Physics Motion In A Straight Line MCQs Set A

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MCQ for Full Syllabus Physics Motion In A Straight Line

Full Syllabus Physics students should refer to the following multiple-choice questions with answers for Motion In A Straight Line in Full Syllabus.

Motion In A Straight Line MCQ Questions Full Syllabus Physics with Answers

 

 

Question: A body in one dimensional motion has zero speed at an instant. At that instant, it must have

  • a) Zero velocity
  • b) Non-zero velocity
  • c) Zero acceleration
  • d) Non-zero acceleration

Answer: Zero velocity

 

Question:

m3

  • a)

    d

  • b)

    c

  • c) 0
  • d) None of this

Answer:

c

 

Question: Consider the motion of the tip of the second hand of a clock. In one minute (R be the length of second hand), its

  • a) Displacement is zero
  • b) Distance covered is zero
  • c) Distance covered is 2R
  • d) None of this

Answer: Displacement is zero

 

Question: The position of a body moving along x-axis at time t is given by x = (t2 – 4t + 6) m. The distance travelled by body in time interval t = 0 to t = 3 s is

  • a) 5 m
  • b) 7 m
  • c) 4 m
  • d) 3 m

Answer: 5 m

 

Question: If a particle is moving along straight line with increasing speed, then

  • a) Its acceleration may be decreasing
  • b) Its acceleration is negative
  • c) Its acceleration is positive
  • d) All of these

Answer: Its acceleration may be decreasing

 

Question: At any instant, the velocity and acceleration of a particle moving along a straight line are v and a. The speed of the particle is increasing if

  • a) v > 0, a > 0
  • b) v < 0, a > 0
  • c) v > 0, a < 0
  • d) v > 0, a = 0

Answer: v > 0, a > 0

 

Question: A particle moves along x-axis with speed 6 m/s for the first half distance of a journey and the second half distance with a speed 3 m/s. The average speed in the total journey is

  • a) 4 m/s
  • b) 2 m/s
  • c) 4.5 m/s
  • d) 5 m/s

Answer: 4 m/s

 

Question: If magnitude of average speed and average velocity over a time interval are same, then

  • a) The particle must move in a straight line without turning back
  • b) The particle must be at rest
  • c) The particle must move with non-zero acceleration
  • d) The particle must move with zero acceleration

Answer: The particle must move in a straight line without turning back

 

Question: If v is the velocity of a body moving along x-axis, then acceleration of body is

  • a)

    9

  • b)

    c

  • c)

    a

  • d) None of this

Answer:

9

 

Question: If a body is moving with constant speed, then its acceleration

  • a) May be variable
  • b) Must be zero
  • c) May be uniform
  • d) All of these

Answer: May be variable

 

Question: When the velocity of body is variable, then

  • a) All of these
  • b) Its acceleration may be constant
  • c) Its speed may be constant
  • d) Its average acceleration may be constant

Answer: All of these

 

Question: An object is moving with variable speed, then

  • a) Its velocity must be variable
  • b) Its velocity may be constant
  • c) Its velocity may be zero
  • d) Its acceleration may be zero

Answer: Its velocity must be variable

 

Question: The position of a particle moving along x-axis is given by x = 10t – 2t2. Then the time (t) at which it will momently come to rest is

  • a) 2.5 s
  • b) 5 s
  • c) 10 s
  • d) 0

Answer: 2.5 s

 

Question: A car moves with speed 60 km/h for 1 hour in east direction and with same speed for 30 min in south direction. The displacement of car from initial position is

  • a)

    14c

  • b)

    2

  • c) Both
  • d) None of this

Answer:

14c

 

Question:

m15

  • a)

    1

  • b)

    2

  • c)

    3

  • d) None of this

Answer:

1

 

Question:

1

  • a) The particle moves with constant acceleration
  • b)

    16

  • c) Both
  • d) None of this

Answer: The particle moves with constant acceleration

 

Question:

m17

  • a)

    3

  • b)

    2

  • c)

    3

  • d) None of this 

Answer:

3

 

Question: The two ends of a train moving with constant acceleration pass a certain point with velocities u and 3u. The velocity with which the middle point of the train passes the same point is

  • a)

    1

  • b)

    2

  • c)

    3

  • d) None of this

Answer:

1

 

Question:

1

  • a)

    c

  • b)

    b

  • c)

    d

  • d) None of this

Answer:

c

 

Question: A particle starts moving with acceleration 2 m/s2. Distance travelled by it in 5th half second is

  • a) 2.25 m
  • b) 1.25 m
  • c) 6.25 m
  • d) 30.25 m

Answer: 2.25 m

 

More Questions..................................

 

Question: A train starts from rest from a station with acceleration 0.2 m/s2 on a straight track and then comes to rest after attaining maximum speed on another station due to retardation 0.4 m/s2. If total time spent is half an hour, then distance between two stations is [Neglect length of train]

  • a) 216 km
  • b) 512 km
  • c) 728 km
  • d) 1296 km

Answer: 216 km

 

Question:

m22

  • a)

    m22

  • b)

    c

  • c)

    d

  • d) a = Ax

Answer:

m22

 

Question: A particle moves in a straight line and its position x at time t is given by x2 = 2+ t. Its acceleration is given by

  • a)

    b

  • b)

    c

  • c)

    e

  • d)

    e

Answer:

b

 

Question: A body is projected vertically upward direction from the surface of earth. If upward direction is taken as positive, then acceleration of body during its upward and downward journey are respectively

  • a) Negative, negative
  • b) Positive, positive
  • c) Negative, positive
  • d) Positive, negative

Answer: Negative, negative

 

Question:  A particle start moving from rest state along a straight line under the action of a constant force and travel distance x in first 5 seconds. The distance travelled by it in next five seconds will be

  • a) 3 x
  • b) 4 x
  • c) 2 x
  • d) x

Answer:  3 x

 

Question: A body is projected vertically upward with speed 40 m/s. The distance travelled by body in the last second of upward journey is [take g = 9.8 m/s2 and neglect effect of air resistance

  • a) 4.9 m
  • b) 9.8 m
  • c) 12.4 m
  • d) 19.6 m

Answer: 4.9 m

 

Question:

27

  • a)

    d

  • b)

    c

  • c) Both
  • d) None of this

Answer:

d

 

Question: A body is projected vertically upward with speed 10 m/s and other at same time with same speed in downward direction from the top of a tower. The magnitude of acceleration of first body w.r.t. second is {take g = 10 m/ s2}

  • a) Zero
  • b) 10 m/s2
  • c) 5 m/s2
  • d) 20 m/s2

Answer: Zero

 

Question: The position of a particle moving along x-axis given by x = (–2t3 + 3t2 +5)m. The acceleration of particle at the instant its velocity becomes zero is

  • a) –6 m/s2
  • b) Zero
  • c) –12 m/s2
  • d) 12 m/s2

Answer: –6 m/s2

 

Question: A car travelling at a speed of 30 km/h is brought to rest in a distance of 8 m by applying brakes. If the same car is moving at a speed of 60 km/h then it can be brought to rest with same brakes in

  • a) 32 m
  • b) 64 m
  • c) 16 m
  • d) 4 m

Answer: 32 m

 

Question: A particle is thrown with any velocity vertically upward, the distance travelled by the particle in first second of its decent is

  • a)

    b

  • b)

    c

  • c) g
  • d) Cannot be calculated

Answer:

b

 

Question: A body is thrown vertically upwards and takes 5 seconds to reach maximum height. The distance travelled by the body will be same in

  • a) 1st and 10th second
  • b) 2nd and 8th second
  • c) 4th and 6th second
  • d) All of these

Answer: 1st and 10th second

 

Question: A ball is dropped from a bridge of 122.5 metre above a river. After the ball has been falling for two seconds, a second ball is thrown straight down after it. Initial velocity of second ball so that both hit the water at the same time is

  • a) 26.1 m/s
  • b) 9.8 m/s
  • c) 55.5 m/s
  • d) 49 m/s

Answer: 26.1 m/s

 

Question: A balloon starts rising from ground from rest with an upward acceleration 2 m/s2. Just after 1 s, a stone is dropped from it. The time taken by stone to strike the ground is nearly

  • a) 0.7 s
  • b) 1 s
  • c) 1.4 s
  • d) 0.3 s

Answer: 0.7 s

 

Question: A boy throws a ball into air after 2 second. The next ball is thrown when the velocity of first ball is zero. How high do the ball rise above his hand? [Take g = 9.8 m/s2]

  • a) 19.6 m
  • b) 29.4 m
  • c) 9.8 m
  • d) 4.9 m

Answer: 19.6 m

 

Question: A ball projected from ground vertically upward is at same height at time tand t2. The speed of projection of ball is [Neglect the effect of air resistance]

  • a)

    b

  • b)

    c

  • c) Both
  • d) None of this

Answer:

b

 

Question: For a body moving with uniform acceleration along straight line, the variation of its velocity (v) with position (x) is best represented by

  • a)

    b

  • b)

    c

  • c) Both
  • d) None of this

Answer:

b

 

Question: The position-time graph for a particle moving along a straight line is shown in figure. The total distance travelled by it in time t = 0 to t = 10 s is

38

  • a) 20 m
  • b) All of these
  • c) 80 m
  • d) 10 m

Answer: 20 m

 

Question: The position-time graph for a body moving along a straight line between O and A is shown in figure. During its motion between O and A, how many times body comes to rest?

39

  • a) 2 times
  • b) 3 times
  • c) 1 time
  • d) Zero

Answer: 2 times

 

Question: Which one of the following graph for a body moving along a straight line is possible?

  • a)

    d

  • b)

    c

  • c) Both
  • d) None of this

Answer:

d

 

Question: A car moving with speed v on a straight road can be stopped with in distance d on applying brakes. If same car is moving with speed 3v and brakes provide half retardation, then car will stop after travelling distance

  • a) 9 d
  • b) 18 d
  • c) 3 d
  • d) 6 d

Answer: 9 d

 

Question: The initial velocity of a particle moving along x-axis is u (at t = 0 and x = 0) and its acceleration a is given by a = kx. Which of the following equation is correct between its velocity (v) and position (x)?

  • a)

  • b)

  • c)

  • d)

Answer:

 

Question:

  • a)

  • b)

  • c)

  • d) None of this

Answer:

 

Question: If average velocity of particle moving on a straight line is zero in a time interval, then

  • a) Velocity of particle must be zero at an instant
  • b) Acceleration of particle may be zero
  • c) Velocity of particle may be never zero in the interval
  • d) Average speed of particle may be zero in the interval

Answer: Velocity of particle must be zero at an instant

 

Question:

  • a)

  • b)

  • c)

  • d) None of this

Answer:

 

Question:

  • a)

  • b)

  • c)

  • d) All of these

Answer:

 

Question: The velocity (v) of a particle moving along x-axis varies with its position x as shown in figure. The acceleration (a) of particle varies with position (x) as

  • a) a = 4x – 8
  • b) 2a = 3x + 5
  • c) a = 2x2 + 4
  • d) a2 = x + 3

Answer: a = 4x – 8

 

Question: A ball is dropped from an elevator moving upward with acceleration ‘a’ by a boy standing in it. The acceleration of ball with respect to [Take upward direction positive]

  • a) Both
  • b) Ground is – g
  • c) Boy is – (g + a)
  • d) None of these

Answer: Both

 

Question: The velocity (v)-time (t) graph for a particle moving along x-axis is shown in the figure. The corresponding position (x)- time (t) is best represented by

  • a)

  • b)

  • c)

  • d) None of this

Answer:

 

Question: The speed-time graph for a body moving along a straight line is shown in figure. The average acceleration of body may be

  • a) All of these
  • b) – 4 m/s2
  • c) 4 m/s2
  • d) Zero

Answer: All of these

 

Question: The acceleration (a)-time (t) graph for a particle moving along a straight starting from rest is shown in figure. Which of the following graph is the best representation of variation of its velocity (v) with time (t)?

  • a)

  • b)

  • c)

  • d)

Answer:

 

Question: An object thrown vertically up from the ground passes the height 5 m twice in an interval of 10 s. What is its time of flight?

  • a)

  • b)

  • c)

  • d) All of these

Answer:

 

Question: A ball dropped from the top of tower falls first half height of tower in 10 s. The total time spend by ball in air is [Take g = 10 m/s2]

  • a) 14.14 s
  • b) 15.25 s
  • c) 12.36 s
  • d) 17.36 s

Answer: 14.14 s

 

Question: A ball is projected vertically upwards. Its speed at half of maximum height is 20 m/s. The maximum height attained by it is [Take g = 10 ms2]

  • a) 40 m
  • b) 25 m
  • c) 15 m
  • d) 35 m

Answer: 40 m

 

Question: A particle starts with initial speed u and retardation a to come to rest in time T. The time taken to cover first half of the total path travelled is

  • a)

  • b)

  • c)

  • d) All of these

Answer:

 

Question: Which of the following speed-time (v-t) graphs is physically not possible?

  • a) All of these
  • b)

  • c)

  • d)

Answer: All of these

 

Question: A particle travels half of the distance of a straight journey with a speed 6 m/s. The remaining part of the distance is covered with speed 2 m/s for half of the time of remaining journey and with speed 4 m/s for the other half of time. The average speed of the particle is

  • a) 4 m/s
  • b) 3/4 m/s
  • c) 5 m/s
  • d) 3 m/s

Answer: 4 m/s

 

Question: A body thrown vertically up with initial velocity 52 m/s from the ground passes twice a point at h height above at an interval of 10 s. The height h is (g = 10 m/s2)

  • a) 10.2 m
  • b) 11.2 m
  • c) 15 m
  • d) 12 m

Answer: 10.2 m

 

Question: The acceleration-time graph for a particle moving along x-axis is shown in figure. If the initial velocity of particle is –5 m/s, the velocity at t = 8 s is

  • a) +15 m/s
  • b) +20 m/s
  • c) –15 m/s
  • d) –20 m/s

Answer: +15 m/s

 

Question: Two balls are projected upward simultaneously with speeds 40 m/s and 60 m/s. Relative position (x) of second ball w.r.t. first ball at time t = 5 s is [Neglect air resistance].

  • a) 100 m
  • b) 120 m
  • c) 80 m
  • d) All of these

Answer: 100 m

 

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