Square Root by Prime Factorisation

Q.

$\text{Find the value of}(\sqrt{49}+\sqrt{0.49}+\sqrt{0.0049})\times \sqrt{10000}.$

1. 77

2. 7

3. 7777

4. 777

Q.

What is the smallest number by which 2592 must be multiplied so that the product is a perfect square?

1. 2

2. 3

3. 5

4. 7

Q. Square root of 256 is

1. 18
2. 16
3. 14
4. 24

Q.

$\sqrt{1764}$ is

1. 43

2. 56

3. 42

4. 48

Q.

Square root of 256 is __.