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Motion in a Straight Line — NEET Physics MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

30questions
10/14/6easy / medium / hard
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Sample questions from this chapter

When is it reasonable to model a moving train as a point object?
  1. When its length is negligible compared with the distance being studied ✓
  2. When the rotation of each wheel must be tracked
  3. When different parts of the train enter a platform at different times
  4. When its bending and vibration determine the observation
Answer: A. A point-object model is adequate when the object's dimensions are much smaller than the distance relevant to the motion. A train can therefore be a point between distant stations, but not while its length controls platform-crossing time.
Why not B: Tracking wheel rotation requires the size and orientation of an extended body, so the point approximation has been applied outside its useful scale.
Why not C: Platform-entry timing depends directly on train length, which a point model discards.
Why not D: Deformation describes relative motion of different parts and cannot be retained in a single point coordinate.
The position of a particle is x = 2 + 3t², with x in metres and t in seconds. What is its velocity at t = 2 s?
  1. 6 m s⁻¹
  2. 8 m s⁻¹
  3. 12 m s⁻¹ ✓
  4. 14 m s⁻¹
Answer: C. Velocity is dx/dt = 6t, so at 2 s it is 12 m s⁻¹. The 14 m s⁻¹ distractor comes from using the position value without differentiating.
Why not A: This keeps only the coefficient 2 × 3 after differentiating and forgets the remaining factor t.
Why not B: This substitutes t = 2 into 2 + 3t and treats an invented linear expression as velocity.
Why not D: This evaluates the position x(2) = 14 m and relabels it as a velocity.
A body starts from rest and falls freely with g = 10 m s⁻². How far does it travel during the fifth second?
  1. 45 m ✓
  2. 25 m
  3. 80 m
  4. 125 m
Answer: A. The fifth-second distance is s(5) − s(4) = 125 − 80 = 45 m, matching Galileo's 1:3:5:7:9 sequence. The 125 m option confuses 'during the fifth second' with 'in five seconds.'
Why not B: This uses ½gn = 25 m, forgetting to square the five seconds in the total-distance expression before attempting the interval calculation.
Why not C: This reports the total distance after 4 s, ½g(4²), rather than subtracting it from the five-second total.
Why not D: This reports the total distance after 5 s, ½g(5²), instead of the distance in the fifth second alone.

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Questions

How many NEET questions are there on Motion in a Straight Line?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.

Is this NEET Physics chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.