Q. If the length of a rectangle $l = 10.5\ cm,$ breadth $b = 2.1\ cm$ and minimum possible measurement by scale = 0.1 cm, then the area is
A) $22.0\ {cm}^{2}$
B) $22.1\ {cm}^{2}$
C) $22.05\ {cm}^{2}$
D) $22\ {cm}^{2}$
Explanation
Area of rectangle $A = lb$ $= 10.5 \times 2.1$ $= 22.05\ cm^{2}$ Minimum possible measurement of scale =0.1 cm So, area measured by scale = $22.0cm^{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.