NUST NET Physics chapter 1: Physics · Measurement, vectors and equilibrium MCQs with answers

By Team Megalecture · Updated 4 Nov 2026

28 exam-style questions on Physics · Measurement, vectors and equilibrium, each with the answer and a short explanation. Ten of them are below to try. The chapter test draws ten fresh questions each time and is marked the moment you finish, with your score by topic.

28 questions · 2 topics · 10 per test

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What chapter 1 covers

Ten Physics · Measurement, vectors and equilibrium questions with answers

Try each one, then open the answer. These ten stay the same; the test draws new ones every time.

1. The mass and speed of a body are measured with uncertainties of 2% and 3%. The percentage uncertainty in its kinetic energy ½mv2 is

  1. A
    5%
  2. B
    6%
  3. C
    8%
  4. D
    11%
Show answer

Answer: C. Percentage uncertainties add, each multiplied by its power: 2% + 2 × 3% = 8%. The ½ is exact and adds nothing. Forgetting the square on v gives 5%.

2. A force F = (i + 3j) N acts at the point r = (2i + j) m. The torque τ = r × F about the origin is

  1. A
    5k N m
  2. B
    7k N m
  3. C
    −5k N m
  4. D
    6k N m
Show answer

Answer: A. τ = (2i + j) × (i + 3j) = 6(i × j) + 1(j × i) = 6k − k = 5k N m. Adding the two products gives 7k; working out F × r instead of r × F gives −5k.

3. Using F = Gm1m2/r2, the dimensions of the gravitational constant G are

  1. A
    [M−1L3T−2]
  2. B
    [ML3T−2]
  3. C
    [M−2L3T−2]
  4. D
    [M−1L2T−2]
Show answer

Answer: A. G = Fr2/(m1m2) = [MLT−2][L2] ÷ [M2] = [M−1L3T−2]. Taking Fr2 alone, without dividing by the two masses, gives [ML3T−2].

4. How many significant figures are there in the measurement 0.03020 m?

  1. A
    3
  2. B
    4
  3. C
    5
  4. D
    6
Show answer

Answer: B. Leading zeros only place the decimal point, so the significant figures are 3, 0, 2 and the final 0, which was measured. Answering 3 drops that trailing zero.

5. An acceleration of 1 cm ms−2 (one centimetre per millisecond squared) expressed in m s−2 is

  1. A
    10 m s−2
  2. B
    10−8 m s−2
  3. C
    106 m s−2
  4. D
    104 m s−2
Show answer

Answer: D. 1 cm = 10−2 m and 1 ms2 = (10−3 s)2 = 10−6 s2, so 1 cm ms−2 = 10−2 ÷ 10−6 = 104 m s−2. Forgetting to square the millisecond gives 10 m s−2.

6. A uniform metre rule of weight 0.80 N balances horizontally on a pivot at the 30 cm mark when a load hangs from the 5 cm mark. The load weighs

  1. A
    0.64 N
  2. B
    0.80 N
  3. C
    1.0 N
  4. D
    1.6 N
Show answer

Answer: A. The rule's weight acts at the 50 cm mark, 20 cm from the pivot, and the load is 25 cm from it. Moments: W × 25 = 0.80 × 20, so W = 0.64 N. 1.0 N turns the ratio upside down, and 1.6 N measures the rule's lever arm from the zero end.

7. The vector product (2i) × (3j) is

  1. A
    6k
  2. B
    −6k
  3. C
    6
  4. D
    zero
Show answer

Answer: A. i × j = k, so (2i) × (3j) = 6k, a vector. Zero is the scalar product of these perpendicular vectors; −6k comes from reversing the order (j × i = −k).

8. A density of 1 g cm−3 expressed in kg m−3 is

  1. A
    10−3 kg m−3
  2. B
    1 kg m−3
  3. C
    103 kg m−3
  4. D
    106 kg m−3
Show answer

Answer: C. 1 g cm−3 = 10−3 kg ÷ 10−6 m3 = 103 kg m−3. Converting the volume but forgetting grams to kilograms gives 106.

9. A uniform plank 6.0 m long and weighing 300 N rests on supports at its two ends. A man weighing 200 N stands 1.5 m from the left end. The upward force from the left support is

  1. A
    200 N
  2. B
    250 N
  3. C
    300 N
  4. D
    500 N
Show answer

Answer: C. Moments about the right end: RL × 6.0 = 300 × 3.0 + 200 × 4.5 = 1800, so RL = 300 N and the right support gives 200 N. 250 N assumes the load is shared equally.

10. Which equation must be wrong because it is not dimensionally consistent? (u and v are velocities, a acceleration, s distance, t time)

  1. A
    v2 = u2 + 2as
  2. B
    s = ut + ½at2
  3. C
    v = u + at2
  4. D
    s = ½(u + v)t
Show answer

Answer: C. at2 has the dimensions of length [L], but v and u are velocities [LT−1], so the terms cannot be added. The other three are consistent.

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Ways to practise this chapter

Physics · Measurement, vectors and equilibrium: questions students ask

How many Physics · Measurement, vectors and equilibrium MCQs are there?

28, each with the answer and a short explanation, across 2 topics: Measurement, Vectors and equilibrium. Every chapter test draws ten of them, so you can take it many times.

Is the NUST NET Physics chapter 1 test free?

Yes. The test, the answers and the explanations are free and need no sign-up. Sign in only if you want your scores kept across devices.

How is the chapter test marked?

The moment you press Finish: your score, the right answer and an explanation for every question, and the ones you got wrong saved in My mistakes to retry.

Can I read the explanations in Urdu?

Yes. In practice mode and on your results you can switch the explanations to Urdu.

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