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Units and Measurements is the first chapter of the syllabus and the one students revise least. It asks short questions that take seconds if you know them and cost you a mark if you do not. Ten questions below, with the answer key and a hint for each.
What this chapter carries in NEET(UG)
- Usually 1 to 2 questions every year, which is 4 to 8 marks.
- Most of them come from dimensional formulas, significant figures and error analysis.
- This chapter takes one evening to secure, and the marks stay secured for two years.
What the syllabus says
In the syllabus (Unit 1, Physics and Measurement): Units of measurement, system of units, SI units, fundamental and derived units, least count, significant figures, errors in measurement, dimensions of physical quantities, dimensional analysis and its applications.
Taken out in 2024: physics, technology and society; accuracy and precision of measuring instruments.
Taken from the NMC syllabus for NEET (UG) 2026, the latest one published. See the full syllabus, unit by unit.
Formulas you must know by heart
| Dimensions of force | [MLT−2] |
| Dimensions of work and energy | [ML2T−2] |
| Dimensions of power | [ML2T−3] |
| Dimensions of pressure | [ML−1T−2] |
| Dimensions of momentum | [MLT−1] |
| Error in a sum or difference | absolute errors add |
| Error in a product or quotient | relative errors add |
| Error in a power, xn | relative error is multiplied by n |
Learn the error rules in the last three rows. They are the part students most often guess.
Ten questions. Give yourself ten minutes.
Write your answers down before you scroll. A question you looked up is a question you have not answered.
Q1. The dimensional formula of force is
- (a) [MLT−1]
- (b) [MLT−2]
- (c) [ML2T−2]
- (d) [ML−1T−2]
Q2. Which of these pairs has the same dimensions?
- (a) work and power
- (b) work and energy
- (c) force and pressure
- (d) speed and acceleration
Q3. The number of significant figures in 0.00340 is
- (a) two
- (b) three
- (c) five
- (d) six
Q4. The dimensional formula of pressure is
- (a) [MLT−2]
- (b) [ML−1T−2]
- (c) [ML2T−2]
- (d) [ML−2T−1]
Q5. When two quantities are multiplied, the errors that add are the
- (a) absolute errors
- (b) relative errors
- (c) squares of the errors
- (d) errors do not add at all
Q6. The SI unit of the amount of a substance is the
- (a) kilogram
- (b) candela
- (c) mole
- (d) kelvin
Q7. If the relative error in measuring the radius of a sphere is 1 %, the relative error in its volume is about
- (a) 1 %
- (b) 2 %
- (c) 3 %
- (d) 9 %
Q8. Which of these is a dimensionless quantity?
- (a) force
- (b) strain
- (c) pressure
- (d) momentum
Q9. The dimensional formula of power is
- (a) [ML2T−2]
- (b) [ML2T−3]
- (c) [MLT−3]
- (d) [ML−1T−3]
Q10. A physical quantity having magnitude but no direction and no unit is
- (a) velocity
- (b) strain
- (c) force
- (d) work
Answer key, with a hint for each
| Q1 | (b) | Force = mass × acceleration, which gives [MLT−2]. |
| Q2 | (b) | Work and energy are the same thing dimensionally, [ML2T−2]. |
| Q3 | (b) | Leading zeros do not count. The 3, the 4 and the final 0 do, so three. |
| Q4 | (b) | Pressure = force/area = [MLT−2]/[L2] = [ML−1T−2]. |
| Q5 | (b) | In a product or quotient the relative errors add. Absolute errors add only in a sum or difference. |
| Q6 | (c) | The mole. The kelvin is temperature and the candela is luminous intensity. |
| Q7 | (c) | V ∝ r3, so the relative error is 3 × 1 % = 3 %. |
| Q8 | (b) | Strain is a length divided by a length, so it has no dimensions and no unit. |
| Q9 | (b) | Power = work/time = [ML2T−3]. |
| Q10 | (b) | Strain again. It is a pure number with no direction and no unit. |
Now mark yourself honestly
NEET(UG) marks the way it marks. Use the same rule here:
- +4 for a right answer
- −1 for a wrong one
- 0 for a blank
So ten questions here are out of 40. In the real paper, 45 Physics questions are out of 180.
If you scored 32 or more, the basics of this chapter are secure. Move to harder questions, not more of these.
If you scored below 24, do not feel bad about it. You have just found out something useful before the exam did. Go back to the formula table above, learn it properly, and sit these ten again tomorrow.
And if you guessed a few and they landed, count those as wrong. A guess that works once will not work in May.
The full chapter, on a clock
Ten questions tell you a little. Forty-five tell you the truth.
The Beginner paper for Units and Measurements is waiting for you on the portal: 45 questions, 45 minutes, marked out of 180, with the answer key and a hint for every question. Sit it tonight and you will know exactly where this chapter stands.
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