Q.

Length, breadth and thickness of a strip having a uniform cross section are measured to be 10.5 cm, 0.05 mm, and 6.0 μm, respectively. Which of the following option(s) give(s) the volume of the strip in cm3 with correct significant figures:                [2025]

1 3.2×10-5  
2 32.0×10-6  
3 3.0×10-5  
4 3×10-5  

Ans.

(4)

Given length L=10.5 cm3 significant digits

Breadth, b=0.05 mm=5×10-3 cm1 significant digit

Thickness t=6.0 μm2 significant digits

Therefore volume V=Lbt must have only 1 significant digit

  V=10.5×0.05×10-1×6.0×10-4 cm3=3×10-5 cc