RRB Junior Engineer Stage 1 Model Papers 6

Question : 2 of 99

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There are two cones. The curved surface area of one is twice that of the other. The slant height of the latter is twice that of the former. The ratio of their radii is

4 : 1
4 : 3
3 : 4
1 : 4

Validate

Solution:

C_1=2C_2

πr_1l_1=2πr_2l_2

also,

l_2=2l_1

πr_1l_1=2×2_6πr_2l_1

r_1/r_2=4/1

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