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Units of measurement, systems of units, SI fundamental and derived units: NEET MCQs with answers

60 questions on this topic of Physics and Measurement (NEET 2027 syllabus). Here are 12; tap one to see its answer and explanation.

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easy

1. Express a speed of 126 km/h in m/s.

  1. 454 m/s
  2. 2100 m/s
  3. 3.5 m/s
  4. 35 m/s
Show answer and explanation

Answer: (D) 35 m/s

1 km/h = 1000 m / 3600 s = 5/18 m/s. So 126 × 5/18 = 35 m/s.

Quick tip: km/h → m/s: multiply by 5/18.

NCERT Class 11

medium

2. Which of the following combinations of base units represents the SI unit of electric capacitance (Farad)?

  1. kg·m²·s⁻³·A⁻²
  2. kg⁻¹·m⁻²·s⁴·A²
  3. kg⁻¹·m⁻²·s³·A²
  4. kg·m⁻¹·s⁻²·A
Show answer and explanation

Answer: (B) kg⁻¹·m⁻²·s⁴·A²

Electric capacitance is defined as C = q/V. Potential difference V = Work/charge = (kg·m²·s⁻²)/(A·s) = kg·m²·s⁻³·A⁻¹. Therefore, C = (A·s) / (kg·m²·s⁻³·A⁻¹) = kg⁻¹·m⁻²·s⁴·A².

hard

3. The magnetic permeability of free space (μ₀) appears in the Biot-Savart law. The SI unit of μ₀ expressed purely in fundamental base units is:

  1. kg·m²·s⁻²·A⁻²
  2. kg·m·s⁻²·A⁻²
  3. kg·m·s⁻¹·A⁻²
  4. kg·m·s⁻³·A⁻¹
Show answer and explanation

Answer: (B) kg·m·s⁻²·A⁻²

The force per unit length between two parallel conductors is F/L = (μ₀/2π)·(I₁I₂/d). Thus, [μ₀] = [F]·[d] / ([L]·[I]²) = [F] / [I]² = (kg·m·s⁻²) / A² = kg·m·s⁻²·A⁻².

medium

4. Given below are two statements: Statement I: The unit of electric potential, the volt, can be written as J·C⁻¹ or W·A⁻¹. Statement II: The base unit representation of capacitance (Farad) is kg⁻¹·m⁻²·s⁴·A². In light of the above statements, choose the most appropriate answer:

  1. Both Statement I and Statement II are correct
  2. Statement I is correct but Statement II is incorrect
  3. Statement I is incorrect but Statement II is correct
  4. Both Statement I and Statement II are incorrect
Show answer and explanation

Answer: (A) Both Statement I and Statement II are correct

Since V = W/q = Power/Current, Volt = J/C = W/A, so Statement I is correct. Capacitance C = q/V = (A·s) / (kg·m²·s⁻³·A⁻¹) = kg⁻¹·m⁻²·s⁴·A², so Statement II is also correct.

easy

5. A car moves at 144 km/h. Its speed in SI units is:

  1. 40 m/s
  2. 4 m/s
  3. 2400 m/s
  4. 518 m/s
Show answer and explanation

Answer: (A) 40 m/s

1 km/h = 1000 m / 3600 s = 5/18 m/s. So 144 × 5/18 = 40 m/s.

Quick tip: km/h → m/s: multiply by 5/18.

NCERT Class 11

hard

6. In a system where momentum (p), area (A), and time (t) are chosen as the fundamental quantities, what is the unit of energy expressed in terms of these fundamental quantities?

  1. p A^(1/2) t^(-1)
  2. p A t^(-1)
  3. p A^(-1/2) t
  4. p^(2) A^(1/2) t^(-1)
Show answer and explanation

Answer: (A) p A^(1/2) t^(-1)

Energy E = Force × distance = (momentum / time) × (Area)^(1/2) = p·t⁻¹·(A^(1/2)) = p·A^(1/2)·t⁻¹.

easy

7. Express a speed of 18 km/h in m/s.

  1. 300 m/s
  2. 64.8 m/s
  3. 0.5 m/s
  4. 5 m/s
Show answer and explanation

Answer: (D) 5 m/s

1 km/h = 1000 m / 3600 s = 5/18 m/s. So 18 × 5/18 = 5 m/s.

Quick tip: km/h → m/s: multiply by 5/18.

NCERT Class 11

easy

8. A car moves at 72 km/h. Its speed in SI units is:

  1. 259 m/s
  2. 2 m/s
  3. 20 m/s
  4. 1200 m/s
Show answer and explanation

Answer: (C) 20 m/s

1 km/h = 1000 m / 3600 s = 5/18 m/s. So 72 × 5/18 = 20 m/s.

Quick tip: km/h → m/s: multiply by 5/18.

NCERT Class 11

easy

9. A student measures the density of a liquid to be 2.5 g/cm³. What is the value of this density in the SI unit system?

  1. 2.5 × 10² kg/m³
  2. 2.5 × 10⁻³ kg/m³
  3. 2.5 × 10⁶ kg/m³
  4. 2.5 × 10³ kg/m³
Show answer and explanation

Answer: (D) 2.5 × 10³ kg/m³

1 g/cm³ = (10⁻³ kg) / (10⁻⁶ m³) = 10³ kg/m³. Therefore, 2.5 g/cm³ corresponds to 2.5 × 10³ kg/m³ in SI units.

easy

10. Express a speed of 72 km/h in m/s.

  1. 2 m/s
  2. 1200 m/s
  3. 20 m/s
  4. 259 m/s
Show answer and explanation

Answer: (C) 20 m/s

1 km/h = 1000 m / 3600 s = 5/18 m/s. So 72 × 5/18 = 20 m/s.

Quick tip: km/h → m/s: multiply by 5/18.

NCERT Class 11

easy

11. Which of the following is the correct SI prefix representation for a multiplier of 10⁻¹⁵?

  1. pico (p)
  2. femto (f)
  3. atto (a)
  4. nano (n)
Show answer and explanation

Answer: (B) femto (f)

In the International System of Units (SI), the prefix 'femto' denotes a factor of 10⁻¹⁵ and its symbol is 'f'. Pico is 10⁻¹², atto is 10⁻¹⁸, and nano is 10⁻⁹.

easy

12. Which of the following units is an SI base unit?

  1. Joule
  2. Newton
  3. Candela
  4. Coulomb
Show answer and explanation

Answer: (C) Candela

The SI system comprises seven base units: meter (m), kilogram (kg), second (s), ampere (A), kelvin (K), mole (mol), and candela (cd). Joule, newton, and coulomb are derived units.

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