# MCQ Questions for Class 11 Physics Chapter 3 Motion in a Straight Line with Answers

Solving the Motion in a Straight Line Multiple Choice Questions of Class 11 Physics Chapter 3 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Motion in a Straight Line Class 11 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 3 Physics Class 11 and cross-check your answers during preparation.

Question 1.

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

Answer: (a) 3 km/h

Question 2.

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

Answer: (c) 3 m/s²

Question 3.

Which one of the following is the unit of acceleration?

(a) m/s

(b) m/s²

(c) km/hr

(d) cm/s

## Answer

Answer: (b) m/s²

Question 4.

The dimensional formula for speed is

(a) T^{-1}

(b) LT^{-1}

(c) L^{-1}T^{-1}

(d) L^{-1}T

## Answer

Answer: (b) LT^{-1}

Question 5.

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

## Answer

Answer: (b) 3 s

Question 6.

The dimensional formula for acceleration is

(a) [LT2]

(b) [LT?2]

(c) [L2T]

(d) [L2T2]

## Answer

Answer: (b) [LT?2]

Question 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

Answer: (c) 2 m/s²

Question 8.

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

## Answer

Answer: (d) 6 s

Question 9.

The dimensional formula for velocity is

(a) [LT]

(b) [LT^{-1}]

(c) [L2T]

(d) [L^{-1}T]

## Answer

Answer: (b) [LT^{-1}]

Question 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

## Answer

Answer: (b) 5 s

Question 11.

The dimensional formula for velocity is

(a) [LT]

(b) [LT^{-1}]

(c) [L2T]

(d) [L^{-1T}]

## Answer

Answer: (b) [LT^{-1}]

Question 12.

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

Answer: (b) 6 m/s

Question 13.

Which one of the following is the unit of velocity?

(a) kilogram

(b) metre

(c) m/s

(d) second

## Answer

Answer: (c) m/s

Question 14.

Which one of the following is the unit of acceleration?

(a) m/s

(b) m/s²

(c) km/hr

(d) cm/s

## Answer

Answer: (b) m/s²

Question 15.

The dimensional formula for acceleration is

(a) [LT2]

(b) [LT?2]

(c) [L2T]

(d) [L2T2]

## Answer

Answer: (b) [LT?2]

Question 16.

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

Answer: (a) ∏/2

Question 17.

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

Answer: (a) 3 km/h

Question 18.

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

Answer: (a) 3 km/h

Question 19.

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

## Answer

Answer: (a) 4 s

Question 20.

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

## Answer

Answer: (a) 1 m/s²

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