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Question 12 Marks
The diameter of a cycle wheel is $4 \frac{5}{11} cm$. How many revolution will it make in moving $6.3\ km$ ?
Answer
$\text { Diameter }=4 \frac{5}{11} cm =\frac{49}{11} cm$
$\text { circumference }=2 \pi r =\pi d $
$=\frac{22}{7} \times \frac{49}{11} $
$=14\ cm$
Circumference $=14 cm =0.14 m$
Distance travelled $=6.3 km =6300 m$
No. of revolutions $=\frac{6300}{0.14}=45000$
Wheel takes $45000$ revolutions in moving $6.3 km$
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Question 22 Marks
The circumference of a garden roller is 280 cm. How many revolutions does it make in moving 490 meters?
Answer
/ircumference $=280 cm =2.8 m$
Dstance travelled $=490 m$
No.of. revolution $=\frac{490}{2.8}=175$
Roller takes 175 revolutions in moving 490 m
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[2 Mark Question Answer] - Mathematics STD 10 Questions - Vidyadip