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Laws of Motion — NEET & JEE 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

Which event illustrates inertia?
  1. A passenger lurches forward when a moving bus stops ✓
  2. A stone accelerates while falling
  3. A spring regains shape after release
  4. A magnet attracts an iron pin
Answer: A. The passenger's body tends to retain forward motion when the bus is stopped by an external force.
Why not B: Increasing fall speed is acceleration produced by gravity, not persistence of state.
Why not C: Elastic restoration is a force response rather than inertia alone.
Why not D: Magnetic attraction explicitly changes motion through an external force.
A net force of 20 N acts on a 5 kg body. What acceleration results?
  1. 100 m s⁻²
  2. 0.25 m s⁻²
  3. 4 m s⁻² ✓
  4. 15 m s⁻²
Answer: C. From a = F/m, acceleration is 20/5 = 4 m s⁻².
Why not A: This multiplies force by mass instead of dividing by mass.
Why not B: This divides mass by force and takes the reciprocal relation.
Why not D: This subtracts mass from force despite unlike physical quantities.
A 50 N retarding force acts on a 20 kg body initially at 15 m s⁻¹. How long until it stops?
  1. 6.0 s ✓
  2. 0.3 s
  3. 37.5 s
  4. 2.5 s
Answer: A. a = F/m = 50/20 = 2.5 m s⁻², so t = u/a = 15/2.5 = 6.0 s. The 2.5 s option is the acceleration itself, quoted as a time.
Why not B: This uses the 50 N force as the acceleration (t = u/F), never dividing by the 20 kg mass.
Why not C: This inverts the mass-force ratio, taking a = m/F = 0.4 m s⁻², so 15/0.4 gives 37.5 s.
Why not D: This reports the acceleration, 2.5 m s⁻², as though it were the time; it is the rate, not the duration.

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Read the chapter first

Every NCERT question in this chapter is solved, free: NCERT solutions — Laws of Motion →

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Questions

How many NEET and JEE questions are there on Laws of Motion?

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

Is this NEET and JEE 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.