MCQ'S FOR CLASS 11 WITH ANSWER CHAPTER 3 MOTION IN STRAIGHT LINE

1. The displacement in metres of a body varies with time t in second as y = t2 – t – 2. The displacement is zero for a positive of t equal to

(a) 1 s
(b) 2 s
(c) 3 s
(d) 4 s

 Answer: 2s

 

2. A boy starts from a point A, travels to a point B at a distance of 3 km from A and returns to A. If he takes two hours to do so, his speed is

(a) 3 km/h
(b) zero
(c) 2 km/h
(d) 1.5 km/h

Answer : 3 km/h

3. Which one of the following is the unit of velocity?

(a) kilogram
(b) metre
(c) m/s
(d) second

Answer: m/s

4.A body starts from rest and travels with uniform acceleration a to make a displacement of 6 m. If its velocity after making the displacement is 6 m/s, then its uniform acceleration a is

(a) 6 m/s²
(b) 2 m/s²
(c) 3 m/s²
(d) 4 m/s²

Answer: 3 m/s²

5. The dimensional formula for acceleration is

(a) [LT²]
(b) [L/T²]
(c) [L²T]

(d) [L²T²] 

Answer :  [L/T²]

6. A boy moves on a circular distance of radius R. Starting from a point A he moves to a point B which is on the other end of the diameter AB. The ratio of the distance travelled to the displacement made by him is

(a) ∏/2
(b) ∏
(c) 2∏
(d) 4∏

Answer :  ∏/2

7. A body starts from rest and travels for five seconds to make a displacement of 25 m if it has travelled the distance with uniform acceleration a then a is

(a) 3 m/s²
(b) 4 m/s²
(c) 2 m/s²
(d) 1 m/s²

Answer : 2 m/s²

8. A body starts from rest and travels with uniform acceleration of 2 m/s². If its velocity is v after making a displacement of 9 m, then v is

(a) 8 m/s
(b) 6 m/s
(c) 10 m/s
(d) 4 m/s

Answer :  6 m/s

9. A body starts from rest. If it travels with an acceleration of 2 m/s², its displacement at the end of 3 seconds is

(a) 9 m
(b) 12 m
(c) 16 m
(d) 10 m

Answer : 9 m

10. A boy starts from a point A, travels to a point B at a distance of 1.5 km and returns to A. If he takes one hour to do so, his average velocity is

(a) 3 km/h
(b) zero
(c) 1.5 km/h
(d) 2 km/h

Answer  : zero

 

11. A body starts from rest and travels with an acceleration of 2 m/s². After t seconds its velocity is 10 m/s . Then t is

(a) 10 s
(b) 5 s
(c) 20 s
(d) 6 s

Answer : 5 s

12. The dimensional formula for velocity is

(a) [LT]
(b) [LT-1]
(c) [L2T]
(d) [L-1T]

Answer : [LT-1]

13. The dimensional formula for speed is

(a)  [LT-1]
(b) [LT]
(c) [L-1T-1]

(d) [L-1T]

Answer :   [LT-1]

14.  Which of the following is not possible for a body in uniform motion?

         

1. 
2. 
3.  Both (a) & (b)
4.  None of the above

Answer : both a and b

15. A man leaves home for a cycle ride and comes back home after an half-an-hour ride covering a distance of one km. What is the average velocity of the ride?

1. 10 kms-1
2. ½ kms-1
3. 2 kms-1
4. Zero

Answer:  Zero

16. Which of the following remains constant if a body travels with constant acceleration?

1. Time
2. Velocity
3. Displacement
4. None of the above

Answer: None of the above

17. What does the displacement of the particle shown in the graph indicate?

                                

1. It indicates a constant velocity
2. It indicates a constant acceleration
3. It indicates that the particle starts with a constant velocity and is accelerated
4. It indicates that the motion is retarded and the particle stops

Answer: It indicates that the motion is retarded and the particle stop

18. If distance covered by a particle is zero, what can be its displacement?

  a. it may or may not be zero

  b. it cannot be zero

  c. it is negative

  d. it must be zero

Answer :  it must be zero