Physics 2021 Waec Past Questions and Answers

Question 11 :

• WAEC 2021

A current of 2A passes through a wire of resistance 4Ω for 3 minutes. Calculate the energy lost.

A. 960J
B. 1440J
C. 2880J
D. 48J

Question 12 :

• WAEC 2021

Which of the following statements about the universal gravitational constant, G, is true?

A. It is fundamental quantity.
B. It has dimension M-¹L³T-².
C. Its S.I. unit is N m\(^2\)kg
D. It is a vector quantity

Question 13 :

• WAEC 2021

The sketched graph represents a progressive wave moving from the left to the right. The period the wave is 0.125s.
Determine the values of the amplitude and wavelength, respectively, of the wave.

A. 8 cm; 27 cm
B. 8 cm; 9 cm
C. 4 cm; 9 cm
D. 16 cm; 27 cm

Question 14 :

• WAEC 2021

Determine the speed of the wave.

A. 64 cm/s
B. 32 cm/s
C. 24 cm/s
D. 72 cm/s

Question 15 :

• WAEC 2021

Which of the following curved surfaces will produce a real image? I. Concave mirror II. Convex mirror III. Diverging lens IV. Converging lens

A. I and III only
B. I, II and IV only
C. II, III and V only
D. II and IV only