NEET 2026 Physics Significant Figures MCQ Question

Topic: Units & Measurements → Significant Figures Difficulty: 🟢 Easy

✅ Ans: B → 7.6

Volume of cube:

$$V=(9.0)^3=729\text{ cm}^3$$ $$\rho=\frac{5.580\times10^3}{729} =7.654\times10^3\text{ kg m}^{-3}$$

So,

$$\boxed{X=7.654}$$

If the question asks the numerical value without rounding, it is closest to 7.6 (B).

🧠 NEET Trick

For multiplication/division, the answer should have the same number of significant figures as the quantity with the least significant figures.

⚠️ Important: Since $9.0$ has only 2 significant figures, strict significant-figure rounding gives 7.7 (D), not 7.6. So the displayed official key B appears inconsistent with the stated significant-figure instruction.