A small ring of negligible thickness and radius 2 cm moves on a bigger rung of radius 10 cm. How many rotations will the small ring take on the bigger ring to make a complete round ?
A. 5
B. 6
C. 7
D. 10
Answer: Option A
Solution(By Examveda Team)
Required number of rotations :$$\eqalign{ & = \frac{{{\text{Circumference of bigger ring}}}}{{{\text{Circumference of smaller ring}}}} \cr & = \frac{{2 \times \pi \times 10}}{{2 \times \pi \times 2}} \cr & = 5 \cr} $$
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D. 307200 m2
E. None of these
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The percentage increase in the area of a rectangle, if each of its sides is increased by 20% is:
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B. 42%
C. 44%
D. 46%
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