Motion in a Straight Line Quiz - CBSE Class 11 Science

Free practice quiz: Motion in a Straight Line (CBSE Class 11 Science). 18 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. A car moves from rest to 20 m/s in 10 seconds. What is its acceleration?

   1. 0 m/s²
   2. 1 m/s²
   3. 2 m/s²
   4. 20 m/s²
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   Answer: C. 2 m/s²

   Acceleration is the change in velocity divided by the change in time. (20 m/s - 0 m/s) / 10 s = 2 m/s²

2. If the displacement of a body is zero, what can we conclude about its distance traveled?

   1. Distance traveled is also zero
   2. Distance traveled is non-zero
   3. Distance traveled can be zero or non-zero
   4. Cannot be determined
   Show answer

   Answer: C. Distance traveled can be zero or non-zero

   Displacement is a vector quantity (magnitude and direction). If the body returns to its starting point, the displacement is zero but it has still traveled a non-zero distance.

3. A body moving with a uniform velocity has:

   1. zero acceleration
   2. constant acceleration
   3. variable acceleration
   4. increasing acceleration
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   Answer: A. zero acceleration

   Uniform velocity implies no change in velocity, hence zero acceleration.

4. Explain the concept of relative velocity with an example.

   1. It's the velocity of an object relative to another object. Example: A car moving at 60 km/hr relative to the ground.
   2. It is always zero. Example: Two cars moving at 60km/hr relative to each other.
   3. It is always the velocity of the object relative to the ground. Example: A bird flying.
   4. It's the velocity of the object relative to the observer. Example: Two cars moving at 60km/hr relative to each other.
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   Answer: A. It's the velocity of an object relative to another object. Example: A car moving at 60 km/hr relative to the ground.

   Relative velocity considers the motion of one object as observed from another moving object.

5. A particle starts from rest and moves with uniform acceleration. After t seconds, it covers a distance s. What is the relation between s, a and t?

   1. s = 1/2at²
   2. s = at²
   3. s = 2at²
   4. s = at
   Show answer

   Answer: A. s = 1/2at²

   This is a standard equation of motion for uniform acceleration starting from rest.

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