RRB Group-D Model Paper 19 with answers for online practice

Since √5 is irrational
√5 + √5 = 2√5 which is irrational
√5 - √5 = 0 which is rational
√5 × √5 = 5 which is rational
√5 ÷ √5 = 1 which is rational
∴ three are rational.