Melting, evaporation and boiling - Jamb Physics Past Questions and Answers

Question 6:

• JAMB 1995

Which of the following statements give the TRUE difference between evaporation and boiling? i. Evaporation occurs at all temperatures while boiling occurs at a fixed temperature for a given pressure. ii. Evaporation is a surface phenomenon while boiling is an interior phenomenon. iii. Evaporation is affected by surface area while boiling is not.

A. I and ii only
B. I and iii only
C. Ii and iii only
D. I, ii, iii.

Question 7:

• JAMB 2013

What will happen to the boiling point of pure water when it is heated in a place 30m below sea level?

A. It will be more than 100 ^oC
B. It will be last than 100 ^oC
C. It will still be at 100 ^oC
D. It will be fluctuating

Question 8:

• JAMB 2015

Which of the following will increases the boiling point of water?
I. Taking it to a high altitude
II. Dissolving a salt into it
III. Heating it in a sealed flask
IV. Increasing the rate of heat supply
.

A. I only
B. III & IV only
C. II & III only
D. II only