Change in temperature of a closed kettle containing water is recorded for 14 minutes. It is represented in the graph shown here. Which of the given statements are true regarding the given situation?

I. The water was heated for 6 minutes.
II. There was less water in the kettle at point T than at point P.
III. The water took 3 minutes to reach its boiling point after it was heated.
IV. The water in the kettle started boiling at R.

Options

A. I and II only
B. III and IV only
C. I, II and III only
D. l, ll, Ill and IV

Answer

B

Explanation

From the given graph, it can concluded that water is being heated for 11 minutes (ii)water starts heating at 3 minutes and start boiling at point R i.e. at T = 6 min.
As the kettle is closed throughout the process, so the amount of water remain constant.