NEET 2026 Physics Significant Figures MCQ Question
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 × 10³ kg m⁻³ where the value of X is:
7.654
7.6
7.65
7.7
Correct Answer
Detailed Explanation
The density is calculated using the formula Density = Mass/Volume. The volume of the cube is (9.0 cm)³ = 729 cm³ = 729 × 10⁻⁶ m³. Thus, the density is 5.580 kg / 729 × 10⁻⁶ m³ = 7.654 × 10³ kg m⁻³. Rounding to significant figures gives X = 7.7.
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