Units and Measurements Previous Year Questions — NEET Physics

3 past-year Units and Measurements questions from NEET (Physics).

Q4 (2024)

The speed of light in vacuum is taken as unity. If light takes 6 min 40 s to reach the Earth from the Sun, the distance between the Sun and the Earth in new unit is:
  1. $3 \times 10^{8}$
  2. $3 \times 10^{10}$
  3. $400$
  4. $500$
### Related Formula $d = v \times t$ ### Core Logic Time $t = 6 \text{ min } 40 \text{ s} = (6 \times 60) + 40 = 400 \text{ s}$. In new unit, speed $v = 1$. Distance $d = v \times t = 1 \times 400 = 400$ units. ### Pattern Recognition Unit system conversion where baseline speed is set to 1. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Physics: Units and Measurements

Q6 (2024)

In a vernier calipers, 20 VSD coincide with 16 MSD (each division of length $1\mathrm{mm}$ ). The least count of the vernier calipers is-
  1. $0.01\mathrm{cm}$
  2. $0.1\mathrm{cm}$
  3. $0.02\mathrm{cm}$
  4. $0.2\mathrm{cm}$
### Related Formula $$\text{Least Count (L.C.)} = 1\text{ MSD} - 1\text{ VSD}$$ ### Core Logic Given: $20\text{ VSD} = 16\text{ MSD} \Rightarrow 1\text{ VSD} = \frac{16}{20}\text{ MSD}$. $$\text{L.C.} = 1\text{ MSD} - \frac{16}{20}\text{ MSD} = \frac{4}{20}\text{ MSD} = \frac{1}{5}\mathrm{mm} = 0.2\mathrm{mm} = 0.02\mathrm{cm}$$ ### Pattern Recognition Least count derivation from division coincidence. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Physics: Units and Measurements

Q21 (2024)

Each side of a metallic cube of mass 5.580 kg is measured to the 9.0 cm. Keeping the significant figures in view, the density of the material of the cube can be best expressed as $X \times 10^{3}$ kg m $^{-3}$ where the value of X is:
  1. 7.654
  2. 7.7
  3. 7.65
  4. 7.6
### Related Formula $$\rho = \frac{\text{Mass}}{\text{Volume}}$$ ### Core Logic $$\text{Density} = \frac{5.580 \text{ kg}}{(9.0 \times 10^{-2} \text{ m})^3} = \frac{5.580}{729 \times 10^{-6}} = 7.6543 \times 10^3 \text{ kg/m}^3$$ Side length 9.0 cm has 2 significant figures. Result must be rounded off to 2 significant figures. $$\rho = 7.7 \times 10^3 \text{ kg/m}^3 \Rightarrow X = 7.7$$ ### Pattern Recognition Significant figures rule in division: output matches minimum input sig-figs. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Physics: Units and Measurements
Rankbit System
JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%) | JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%)

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