RRB Group-D Model Paper 18 with answers for online practice

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Question : 20 of 100

Marks: +1, -0

If

√{0.03×0.3a}=0.3×0.3×√b

value of a/b is

0.09
0.3
0.9
0.8

Solution:

√{0.03×0.3a}=0.3×0.3×√b

On squaring both sides, we get
⇒.009a = $ (0.3)^4 × b
$ ⇒.009a = .0081 × b
⇒

a/b=.0081/.009

⇒

a/b=81/90

⇒

a/b=9/10

=.9

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