NEET 2026 — Physics solution

NEET2026Physics

Each side of a metallic cube of mass 5.580 kg is measured to be 9.0 cm. Keeping the significant figures in view, the density of the material of the cube can be best expressed as $X \times 1 0^{3}$ kg m $^{- 3}$ , where the value of X is :

A
7.654
B
7.7
C
7.65
D
7.6

Solution

Density $= \frac{mass}{volume} = \frac{5.580}{( 9.0 \times 1 0 ^{- 2} ) ^{3}} \approx 7.654 \times 1 0^{3}$ kg/m $^{3}$ .

The side length 9.0 cm is given to 2 significant figures, which is the limiting precision. Rounding the result to 2 significant figures gives $7.7 \times 1 0^{3}$ kg/m $^{3}$ . Hence X = 7.7.

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