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RRB Technician Grade I 19 Dec 2024 Shift 1 Paper

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Question : 33 of 100

Marks: +1, -0

The value of

\sqrt{144}+\sqrt{0.04}-\sqrt{9}=

6.96
11.42
9.2
8.82

Solution:

Concept:

Use of square roots of perfect squares and decimals.

Explanation:

Given expression:

\sqrt{144}+\sqrt{0.04}-\sqrt{9}

We know

\sqrt{a^2}=a

for non-negative

a

.

So,

\sqrt{144}=12

because

12^2=144

.

Next,

\sqrt{0.04}=\sqrt{\frac{4}{100}}=\frac{2}{10}=0.2

Also,

\sqrt{9}=3

because

3^2=9

.

Substituting these values:

12+0.2-3

=12.2-3

=9.2

Answer:

9.2

, which is option C.

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