Waec Physics 2020 Past Questions and Answers

Question 41:

• WAEC 2020

Which of the following statements about the process of melting of a solid are true? The temperature of the solid will
I. remain steady until melting starts.
ll. keep rising until melting starts,
Ill remain steady as melting proceeds.
V, keep rising as melting proceeds.

A. II and llI only
B. IlI and IV only
C. I, Il and Ill only
D. Ll and IV only

Question 42:

• WAEC 2020

A diver steps off a diving platform that is 10m above the water. If there is no air resistance during the fall, there will be a decrease in the diver's

A. Gravitational potential energy
B. Total mechanical energy
C. Kinetic energy
D. Momentum

Question 43:

• WAEC 2020

Which of the following actions would increase the electric force between two positively charged particles?

A. Decreasing the mass of the particles
B. Decreasing the distance between the particles
C. Increasing the assistance between the particles
D. Increasing the mass of the particles

Question 44:

• WAEC 2020

A luminous object is one that

A. Gives off dim blue-green light only in the dark.
B. Gives out light of its own
C. Shines by reflected light only
D. Glows only in the presence of light

Question 45:

• WAEC 2020

Which of the following units is not fundamental?

A. Metre
B. Kilogram
C. Joule
D. Candela