GkSeries.com

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

DOWNLOAD CURRENT AFFAIRS PDF FROM APP

(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

Please share this page

Chapters

Click Here to Read more questions

Teacher Eligibility Test