MCQ On Class 11 Physics Chapter 3 Motion in a Straight Line

1 Which one of the following is the unit of velocity?

A kilogram

B metre

C m/s

D second

View Answer

Answer:m/s

2 The dimensional formula for acceleration is

A [LT2]

B [LT?2]

C [L2T]

D [L2T2]

View Answer

Answer:[LT?2]

3 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∏

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Answer:∏/2

4 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

View Answer

Answer:2 m/s²

5 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

View Answer

Answer:5 s

6 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

View Answer

Answer:zero

7 The dimensional formula for velocity is

A [LT]

B [LT^-1]

C [L2T]

D [L-1T]

View Answer

Answer:[LT^-1]

8 Which one of the following is the unit of velocity?

A kilogram

B metre

C m/s

D second

View Answer

Answer:m/s

9 A body starts from rest and travels with uniform acceleration on a straight line. If its velocity after making a displacement of 32 m is 8 m/s, its acceleration is

A 1 m/s²

B 2 m/s²

C 3 m/s²

D 4 m/s²

View Answer

Answer:1 m/s²

10 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

View Answer

Answer:5 s

11 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

View Answer

Answer:2 s

12 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

View Answer

Answer:2 s

13 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

View Answer

Answer:3 km/h

14 A 180 metre long train is moving due north at a speed of 25 m/s. A small bird is flying due south, a little above the train, with a speed of 5 m/s. The time taken by the bird to cross the train is

A 10 s

B 12 s

C 9 s

D 6 s

View Answer

Answer:6 s

15 A body starts from rest and travels for t second with uniform acceleration of 2 m/s². If the displacement made by it is 16 m, the time of travel t is

A 4 s

B 3 s

C 6 s

D 8 s

View Answer

Answer:4 s

16 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

View Answer

Answer:6 m/s

17 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

View Answer

Answer:9 m

18 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

View Answer