NCERT Solutions for class 11 Physics | Chapter 3 - Motion in a Straight Line

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Questions
1 Which one of the following is the unit of velocity?
A kilogram
B metre
C m/s
D second

Answer:m/s
2 The dimensional formula for acceleration is
A [LT2]
B [LT?2]
C [L2T]
D [L2T2]

Answer:[LT?2]
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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∏

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

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

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

Answer:zero
7 The dimensional formula for velocity is
A [LT]
B [LT-1]
C [L2T]
D [L-1T]

Answer:[LT-1]
8 Which one of the following is the unit of velocity?
A kilogram
B metre
C m/s
D second

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

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

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

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

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

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

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

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

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

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

Answer:3 m/s²
19 The dimensional formula for speed is
A T-1
B LT-1
C L-1T-1
D L-1T

Answer:LT-1
20 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

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