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

Question 1:

• JAMB 2019

If the time of flight is 96seconds, calculate the horizontal range through the point of projection.

A. 84400m
B. 69000m
C. 61440m
D. 24000m

Question 2:

• JAMB 1978

An ice cube floats in a glass of water filled to the brim. What happens when the ice melts?

A. The water level remains the same
B. There is a drop in the level of water in the glass due to condensation on its outside
C. The water in the glass overflows
D. The level of water drops because melted ice occupies less volume
E. None of the above is correct

Question 3:

• JAMB 1978

The statements below were made by some students describing what happened during the determination of the melting point of solids.
i. the temperature of the solid was solid until melting started
ii. the temperature of the solid rose until melting started
iii. during melting, the temperature was rising
iv. during melting, the temperature was constant
v. the temperature continued to rise after all the solid had melted
vi. the temperature stopped rising after all the solid had melted. Which of the following gives correct statements in the right order?

A. Ii, iv, and v
B. Ii, iii and vi
C. I, iii and vi
D. I, iii and v
E. I, iv and v

Question 4:

• JAMB 1981

Heat was supplied to a block of ice at 0^oC until half of it melted. Which of the following statements is true?

A. The temperature rises and the ice expand
B. The temperature remains constant and the volume of the ice decreases
C. The ice gives out heat as it melts and the temperature decreases
D. The mass remains constant and the temperature increases
E. The temperature decreases because some heat is lost

Question 5:

• JAMB 1992

A block of ice floats on water inside a container. If the block of ice gets completely melted, the level of water in the container will

A. Increase
B. Remain the same
C. Decrease
D. First decrease and then increase