JEE Physics Motion In A Straight Line MCQs Set B

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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 is projected vertically upward from ground. If we neglect the effect of air, then which one of the following is the best representation of variation of speed (v) with time (t)?

  • a)

    b

  • b)

    a

  • c)

    d

  • d) All of these

Answer:

b

 

Question: Which one of the following time-displacement graph represents two moving objects P and Q with zero relative velocity?

  • a)

    b

  • b)

    a

  • c) Both
  • d) None of this

Answer:

b

 

Question:

m43

  • a) 1 : 3
  • b) None of these
  • c) 1 : 2
  • d) 1 : 4

Answer: 1 : 3

 

Question:

44

  • a) 4 m/s
  • b) 12 m/s
  • c) 8 m/s
  • d) 10 m/s

Answer: 4 m/s

 

Question: Figure shows the graph of x-coordinate of a particle moving along x-axis as a function of time. Average velocity during t = 0 to 6 s and instantaneous velocity at t = 3 s respectively, will be

45

  • a) 0, 0
  • b) 10 m/s, 0
  • c) 60 m/s, 0
  • d) 0, 10 m/s

Answer: 0, 0

 

Question:

m46

  • a) 6 s
  • b) 7 s
  • c) 3 s
  • d) 1 s

Answer: 6 s

 

Question:  The velocity versus time graph of a body moving in a straight line is as shown in the figure below

47

  • a) The distance moved by the body during 0 to 3 s is 6 m
  • b) The acceleration of the body in 2 to 3s is 4 ms–2
  • c) The acceleration of the body in 0 to 2s is 4 ms–2
  • d) The distance covered by the body in 0 to 2s is 8m

Answer: The distance moved by the body during 0 to 3 s is 6 m

 

Question:  Acceleration-time graph for a particle is given in figure. If it starts motion at t = 0, distance travelled in 3 s will be

48

  • a) 4 m
  • b) 2 m
  • c) 5 m
  • d) 6 m

Answer: 4 m

 

Question:  Figure shows the position of a particle moving on the x-axis as a function of time

  • a) The particle has come to rest 4 times
  • b) The velocity at t = 8 s is negative
  • c) The velocity remains positive for t = 2 s to t = 6 s
  • d) The particle moves with a constant velocity

Answer: The particle has come to rest 4 times

 

Question: A particle moves along x-axis in such a way that its x-co-ordinate varies with time according to the equation x = 4 – 2t + t2. The speed of the particle will vary with time as

  • a)

  • b)

  • c)

  • d) All of these

Answer:

 

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) 20 m

Answer: 100 m

 

Question:  The position (x) of a particle moving along x-axis varies with time (t) as shown in figure. The average acceleration of particle in time interval t = 0 to t = 8 s is

  • a) –5 m/s2
  • b) 2.5 m/s2
  • c) –4 m/s2
  • d) 3 m/s2

Answer: –5 m/s2

 

Question:  The position (x)-time (t) graph for a particle moving along a straight line is shown in figure. The average speed of particle in time interval t = 0 to t = 8 s is

  • a) 5 m/s
  • b) 7.5 m/s
  • c) 9.7 m/s
  • d) 0

Answer: 5 m/s

 

Question:  A ball is dropped from a height h above ground. Neglect the air resistance, its velocity (v) varies with its height above the ground as

  • a)

  • b)

  • c)

  • d) None of this

Answer:

 

Question: A train of 150 m length is going towards North at a speed of 10 m/s. A bird is flying at 5 m/s parallel to the track towards South. The time taken by the bird to cross the train is

  • a) 10 s
  • b) 15 s
  • c) 30 s
  • d) 12 s

Answer: 10 s

 

Question: Two cars are moving in the same direction with a speed of 30 km/h. They are separated from each other by 5 km. Third car moving in the opposite direction meets the two cars after an interval of 4 minutes. The speed of the third car is

  • a) 45 km/h
  • b) 40 km/h
  • c) 25 km/h
  • d) 30 km/h

Answer: 45 km/h

 

Question:  Two cars A and B are moving in same direction with velocities 30 m/s and 20 m/s. When car A is at a distance d behind the car B, the driver of the car A applies brakes producing uniform retardation of 2 m/s2. There will be no collision when

  • a) d > 25 m
  • b) d < 125 m
  • c) d > 125 m
  • d) d < 2.5 m

Answer: d > 25 m

  

Question: Two trains each of length 100 m moving parallel towards each other at speed 72 km/h and 36 km/h respectively. In how much time will they cross each other?

  • a) 6.67 s
  • b) 3.5 s
  • c) 7.25 s
  • d) 4.5 s

Answer: 6.67 s

 

Question: A ball is dropped from the top of a building of height 80 m. At same instant another ball is thrown upwards with speed 50 m/s from the bottom of the building. The time at which balls will meet is

  • a) 1.6 s
  • b) 5 s
  • c) 8 s
  • d) 10 s

Answer: 1.6 s

  

Question: A ball is thrown upward with speed 10 m/s from the top of the tower reaches the ground with a speed 20 m/s. The height of the tower is [Take g = 10 m/s2]

  • a) 15 m
  • b) 20 m
  • c) 10 m
  • d) 25 m

Answer: 15 m

 

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

 

Question: A body falling from a vertical height of 10 m pierces through a distance of 1 m in sand. It faces an average retardation in sand equal to (g = acceleration due to gravity)

  • a) 9 g
  • b) 100 g
  • c) 1000 g
  • d) g

Answer: 9 g

 

Question:

  • a) 15 m
  • b) 12.8 m
  • c) 30 m
  • d) None of this

Answer: 15 m

 

Question: A body is dropped from a height H. The time taken to cover second half of the journey is

  • a)

  • b)

  • c)

  • d)

Answer:

 

Question:

  • a) 3 s
  • b) 4 s
  • c) 5 s
  • d) 2 s

Answer:  3 s

 

Question:

  • a) Non-uniform acceleration
  • b) Uniform acceleration
  • c) Uniform retardation
  • d) Zero acceleration

Answer: Non-uniform acceleration

 

Question: The displacement (x) - time (t) graph of a particle is shown in figure. Which of the following is correct?

  • a) Particle starts with zero velocity and variable acceleration
  • b) Particle starts with non-zero velocity and variable acceleration
  • c) Particle starts with zero velocity and uniform acceleration
  • d) Particle starts with non-zero velocity and uniform acceleration

Answer: Particle starts with zero velocity and variable acceleration

 

Question: A stone thrown upward with a speed u from the top of a tower reaches the ground with a velocity 4u. The height of the tower is

  • a)

  • b)

  • c)

  • d) None of these

Answer:

 

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

  • a) Particle must move in a straight line without turning back
  • b) Particle must be at rest
  • c) Particle must move with uniform acceleration
  • d) Particle must move with zero acceleration

Answer: Particle must move in a straight line without turning back

 

Question: A body is dropped from a certain height h (h is very large) and second body is thrown downward with velocity of 5 m/s simultaneouly. What will be difference in heights of the two bodies after 3s?

  • a) 15 m
  • b) 20 m
  • c) 10 m
  • d) 5 m

Answer: 15 m

 

Question: Ball A is thrown up vertically with speed 10 m/s. At the same instant another ball B is released from rest at height h. At time t, the speed of A relative to B is

  • a) 10 m/s
  • b) 10 – 2 gt
  • c) 10 – gt
  • d) None of this

Answer: 10 m/s

 

Question: A man moves in an open field such that after moving 10 m on a straight line, he makes a sharp turn of 60º to his left. The total displacement after 8 such turn is equal to

  • a) 17.32 m
  • b) 14.14 m
  • c) 15 m
  • d) 12 m

Answer: 17.32 m

 

Question: A body starts from origin and moves along x-axis so that its position at any instant is x = 4t2 – 12t where t is in second and v in m/s. What is the acceleration of particle?

  • a) 8 m/s2
  • b) 4 m/s2
  • c) 24 m/s2
  • d) 0 m/s2

Answer: 8 m/s2

 

Question: Position time graph of a particle moving along straight line is shown which is in the form of semi-circle starting from t = 2 to t = 8 s. Select correct statement

  • a) Velocity of particle is opposite to acceleration between t = 2 to t = 5 s
  • b) Velocity of particle is opposite to acceleration between t = 5 to t = 8 s
  • c) Velocity of particle between t = 0 to t = 2 s is positive
  • d) None of this

Answer: Velocity of particle is opposite to acceleration between t = 2 to t = 5 s

 

Question:

  • a) 10 s
  • b) 12 s
  • c) 8 s
  • d) 6 s

Answer: 10 s

 

Question:

  • a) 0 m
  • b) 6 m
  • c) 4 m
  • d) 2 m

Answer: 0 m

 

Question: The motion of a particle along a straight line is described by equation  x = 8 + 12t – twhere x is in metre and t in second. The retardation of the particle when its velocity becomes zero, is

  • a) 12 ms–2
  • b) 24 ms–2
  • c) 6 ms–2
  • d) 8 ms–2

Answer: 12 ms–2

 

Question: A boy standing at the top of a tower of 20 m 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) 10.0 m/s
  • d) 5.0 m/s

Answer:  20.0 m/s

 

Question:

  • a)

  • b)

  • c)

  • d) None of this

Answer:

 

Question: The speed-time graph of a particle moving along a solid curve is shown below. The distance traversed by the particle from t = 0 to t = 3 is

  • a)

  • b)

  • c)

  • d) All of these

Answer:

 

Question:

  • a)

  • b)

  • c) 6 m
  • d) 4 m

Answer:

 

Question:

  • a) 9
  • b) 10
  • c) 1.8
  • d) 12

Answer: 9

 

Question:  A particle shows distance-time curve as given in this figure. The maximum instantaneous velocity of the particle is around the point

  • a) C
  • b) D
  • c) B
  • d) A

Answer: C

 

Question: The displacement-time graph of a moving particle is shown below. The instantaneous velocity of the particle is negative at the point

  • a) E
  • b) F
  • c) C
  • d) D

Answer: E

 

Question:

  • a) Go on increasing with time
  • b) Go on decreasing with time
  • c) Both
  • d) None of this

Answer: Go on increasing with time

 

Question:

  • a) 16 m
  • b) 24 m
  • c) 40 m
  • d) 56 m

Answer: 16 m

 

Question: Two bodies A (of mass 1 kg) and B (of mass 3 kg) are dropped from heights of 16 m and 25 m, respectively. The ratio of the time taken by them to reach the ground is

  • a)

  • b)

  • c)

  • d) None of this

Answer:

 

Question:

  • a) 54 m
  • b) 81 m
  • c) 24 m
  • d) 32 m

Answer: 54 m

 

Question:

  • a)

  • b)

  • c)

  • d) None of this

Answer:

 

Question:

  • a)

  • b)

  • c)

  • d)

Answer:

 

Question:

  • a)

  • b)

  • c)

  • d) None of this

Answer:

 

Question:

  • a) 20 ms–1
  • b) 10 ms–1
  • c) 30 ms–1
  • d) 50 ms–1

Answer: 20 ms–1 

 

Question: A particle moves a distance x in time t according to equation x = (t + 5)–1. The acceleration of particle is proportional to

  • a) (Velocity)3/2
  • b) (Distance)2
  • c) (Distance)–2
  • d) (Velocity)2/3

Answer: (Velocity)3/2

 

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 = 18 s. What is the value of v? (Take g = 10 m/s2)

  • a) 75 m/s
  • b) 60 m/s
  • c) 55 m/s
  • d) 40 m/s

Answer: 75 m/s

 

Question: The velocity of train increases uniformly from 20 km/h to 60 km/h in 4 hour. The distance travelled by the train during this period is

  • a) 160 km
  • b) 180 km
  • c) 100 km
  • d) 120 km

Answer: 160 km

 

Question: A particle moves along a straight line suchthat its displacement at any time t is given bys = (t3 – 6t2 – 3t + 4) metres. The velocity when the acceleration is zero is

  • a) –15 m/s
  • b) –9 m/s
  • c) 42 m/s
  • d) 3 m/s

Answer: –15 m/s

 

Question:  

  • a)

  • b)

  • c)

  • d) None of this

Answer:

 

Question:

  • a)

  • b)

  • c)

  • d) None of this

Answer:

 

Question: The water drops fall at regular intervals from a tap 5 m above the ground. The third drop is leaving the tap at instant the first drop touches the ground. How far above the ground is the second drop at that instant? (Take g = 10 ms–2)

  • a) 3.75 m
  • b) 4. 00 m
  • c) 1.25 m
  • d) 2.50 m

Answer: 3.75 m

 

Question:

  • a)

  • b)

  • c)

  • d)

Answer:

 

Question: If a car at rest accelerates uniformly to a speed of144 km/h in 20 s, it covers a distance of

  • a) 400 m
  • b) 20 m
  • c) 2980 cm
  • d) 1440 cm

Answer: 400 m

 

Question: A man throws balls with the same speed vertically upwards one after the other at an interval of 2 second. 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/s2)

  • a) More than 19.6 m/s
  • b) Any speed less than 19.6 m/s
  • c) At least 9.8 m/s
  • d) Only with speed 19.6 m/s

Answer: More than 19.6 m/s

 

Question:  If a ball is thrown vertically upwards with speed u, the distance covered during the last t seconds of its ascent is

  • a)

  • b)

  • c) (u + gt)t
  • d) ut

Answer:

 

Question:  A particle A is dropped from a height and another particle B is projected in horizontal direction with speed of 5 m/s from the same height then correct statement is

  • a) Both particles will reach at ground simultaneously
  • b) Both particles will reach at ground with same speed
  • c) Particle B will reach at ground first with respect to particle A
  • d) Particle A will reach at ground first with respect to particle B

Answer: Both particles will reach at ground simultaneously

 

Question: A particle is thrown vertically upward. Its velocity at half of the height is 10 m/s, then the maximum height attained by it is (g = 10 m/s2)

  • a) 10 m
  • b) 16 m
  • c) 20 m
  • d) 8 m

Answer: 10 m

 

Question:  Motion of a particle is given by equation s = (3t3 + 7t2 + 14t + 8) m The value of acceleration of the particle at t = 1 s is

  • a) 32 m/s2
  • b) 23 m/s2
  • c) 16 m/s2
  • d) 10 m/s2

Answer: 32 m/s2

 

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