Question : What smallest value must be added to 508, so that the resultant is a perfect square?

Option 1: 4

Option 2: 9

Option 3: 18

Option 4: 21

Question : What the least value should be added to 2505 so that it becomes a perfect square?

Option 1: 5

Option 2: 20

Option 3: 70

Option 4: 96

Question : The term that should be added to ($4x^2+8x$) so that the resulting expression be a perfect square, is:

Option 1: $2$

Option 2: $4$

Option 3: $2x$

Option 4: $1$

Question : What is the smallest perfect square number that is completely divisible by 4, 6, 9, 12, and 15?

Option 1: 784

Option 2: 900

Option 3: 961

Option 4: 841

Question : What is the simplified value of $(2+1)(2^{2}+1)(2^{4}+1)(2^{8}+1)$?

Option 1: $2^{8}-1$

Option 2: $2^{16}-1$

Option 3: $2^{32}-1$

Option 4: $2^{64}-1$