Question

Four students (A), (B), (C) and (D) independently observed the evaporation of water under different conditions, and recorded the temperature of water at regular intervals as shown below.

Student	Placing of experimental set up in/under	Temperature recording for 15 minutes
(A)	sun	increased gradually
(B)	open air	decreased gradually
(C)	a fan	initially increased, then became constant
(D)	a corner of the room	initially increased, then gradually decreased

The correct recording of observations is that of the student :
(1) (A)
(2) (B)
(3) (C)
​(4) (D)

Answer 1

In the open air, temperature and pressure of the environment will remain the same, so first evaporation increases but gradually it will decrease. So, after 15 minutes temperature observation will be gradually decreasing.

Hence, the correct answer is option 2.