Question

Assertion : When a bottle of cold carbonated drink is opened, a slight fog forms around the opening.

Reason : Adiabatic expansion of the gas causes lowering of temperature and condensation of water vapours.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

Answer 1

Correct option (a) Both A and R are true and R is the correct explanation of A

Explanation :

Assertion is true. The change is sudden and fast. The reason is also true. It explains the assertion. Adiabatic expansion causes cooling.