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RRB Assistant Loco Pilot and Technician Model Paper 2 with solutions
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© examsnet.com
Question : 15
Total: 75
If the radius of any circle is increased by two times then what will increase in its surface area?
400%
300%
200%
100%
Validate
Solution:
Area of circle = π
r
2
Now, area of circle = π
(
2
r
)
2
= 4π
r
2
Area increased = 4π
r
2
– π
r
2
= π
r
2
Percentage increased area
=
3
π
r
2
π
r
2
x 100 = 300%
© examsnet.com
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