Change of State - Jamb Physics Past Questions and Answers

Question 36:

• JAMB 2009

A heating coil rated 1000 W is used to boil off completely 2 kg of boiling water. the time required to boil of the water is_______
[Special latent heat of Vaporization of water = 2.3 x 10⁶ Jkg^-1]

A. 1.15 x 10⁴s
B. 1.15 x 10³s
C. 4.6 x 10⁴s
D. 4.6 x 10³s

Question 37:

• JAMB 2010

If a container is filled with ice to the brim, what happens to the level of water when the ice completely melts?

A. The level of water goes up
B. The water in the glass outflows
C. The level of water remains unchanged
D. The level of water drops

Question 38:

• JAMB 2010

If a container is filled with ice to the brim, what happens to the level of water when the ice completely melts?

A. The level of water goes up
B. The water in the glass outflows
C. The level of water remains unchanged
D. The level of water drops

Question 39:

• JAMB 2011

The phenomenon that shows that increase in pressure lowers the melting point can be observed in

A. Sublimation
B. Condensation
C. Coagulation
D. Regelation

Question 40:

• JAMB 2011

Steam burn is more severe than that of boiling water because

A. Steam burn is independent of relative humidity
B. Stem possesses greater heat energy per unit mass
C. Water boils at a higher temperature
D. Steam burn is dependent on relative humidity