RRB Group-D Model Paper 11 with answers for online practice

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Question : 9 of 100

Marks: +1, -0

On simplification

√{(0.65)^{2}−(0.16)^{2}}

reduces to

0.63
0.65
0.54
None of these

Solution:

√{(0.65)^{2}−(0.16)^{2}}

since,

a^2 - b^2

= (a - b) ( a + b)

⇒√{(0.65+0.16)(0.65−0.16)}

⇒√{(0.81)(0.49)}

⇒√{(0.9)(0.9)×(0.7)(0.7)}

⇒ 0.9 × 0.7 = 0.63

∴ Answer is 0.63

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