Here, you will get Class 11 Physics MCQ of Chapter 3 Motion in a Straight Line for cracking JEE and NEET/AIIMS. By solving these MCQs of Class 11 Physics Chapter 3 Motion in a Straight Line, you will get the confidence to crack JEE or NEET. Practice **MCQ Questions for Class 11 Physics** with Answers on a daily basis and score well in exams.

## Motion In A Straight Line Class 11 MCQs Questions with Answers

**The dimensional formula for speed is**

(a) T^{-1}

(b) LT^{-1}

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

(d) L^{-1}T

Answer: (b) LT-1

**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: (c) 3 m/s²

**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: (b) 2 s

**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 i**s

(a) 10 s

(b) 12 s

(c) 9 s

(d) 6 s

Answer: (d) 6 s

**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: (b) zero

**For the motion with uniform velocity, the slope of the velocity-time graph is equal to**

(a)1 m/s

(b)Zero

(c)Initial velocity

(d)Final velocity

Answer: (b) Zero

**A particle is moving with a constant speed along a straight-line path. A force is not required to**

(a)change its direction

(b)decrease its speed

(c)keep it moving with uniform velocity

(d)Increase its momentum

Answer: (c) keep it moving with uniform velocity

**The ratio of the average velocity and average speed of a body is**

(a)1

(b)More than 1

(c)1 or Less than 1

(d)None of the option

Answer: (c) 1 or Less than 1

**Which is the formula for motion in a straight line**

(a)v = u + at

(b)v = u – at

(c)u = 2at+v

(d)v = 2at+u

Answer: (a) v = u + at

**The location of a particle has changed. What can we say about the displacement and the distance covered by the particle?**

(a) Neither can be zero

(b) One may be zero

(c) Both may be zero

(d) One is +ve, other is –ve

Answer: (a) Neither can be zero

**The numerical ratio of displacement to distance for a moving object is**

(a) always less than 1

(b) always equal to 1

(c) always more than 1

(d) equal to or less than 1

Answer: (d) equal to or less than 1

**The incorrect statement(s) from the following is/are**I. A body having zero velocity will not necessarily have zero acceleration

II. A body having zero velocity will necessarily have zero acceleration

III. A body having uniform speed can have only uniform acceleration

IV. A body having non-uniform velocity will have zero acceleration

(a) II, III and IV

(b) I and II

(c) II and III

(d) IV only

Answer: (a) II, III and IV

**Area under velocity-time curve over a given interval of time represents**

(a) acceleration

(b) momentum

(c) velocity

(d) displacement

Answer: (d) displacement

**Free fall of an object (in vacuum) is a case of motion with**

(a) uniform velocity

(b) uniform acceleration

(c) variable acceleration

(d) constant momentum

Answer: (b) uniform acceleration

**The total distance travelled by the body in the given time is equal to**

(a) the area which v– t graph encloses with displacement axis

(b) the area which x – t graph encloses with time axis

(c) the area which v – t graph encloses with time axis

(d) the area which a – t graph encloses with axis

Answer: (c) the area which v – t graph encloses with time axis

**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: (b) 5 s

**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: (a) 1 m/s²

**If distance covered by a particle is zero, what can you say about its displacement?**

(a) It must be zero

(b) It cannot be zero

(c) It may or may not be zero

(d) It is negative

Answer: (a) It must be zero

**The distance travelled by a body is directly proportional to the time taken. Its speed**

(a) remains constant

(b) decreases

(c) increases

(d) becomes zero

Answer: (a) remains constant

**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: (a) ∏/2

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