Waec Physics 2019 Past Questions and Answers

Question 41:

• WAEC 2019

Which of the following characteristics of waves can a ripple tank be used to demonstrate?
I. Reflection
II. Refraction
III. Diffraction

A. I, II and Ill
B. Ll and ll only
C. L and lII only
D. I and II only

Question 42:

• WAEC 2019

Which of the following graphs gives the correct relationship between energy and mass when mass is converted to energy.

A. A
B. B
C. C
D. D

Question 43:

• WAEC 2019

An 800 kg car moving at 80 km hr\(^{-1}\) collides with a 1200 kg car moving at 40 km hr\(^{-1}\) in the same direction. If the cars stick together, calculate their common velocity.

A. 60 km hr\(^{-1}\)
B. 8 km hr\(^{-1}\)
C. 40 km hr\(^{-1}\)
D. 56 km hr\(^{-1}\)

Question 44:

• WAEC 2019

The mass of a load is doubled while the force acting on it is halved. The resulting acceleration of the load is

A. Quadrupled
B. Quartered
C. Halved
D. Doubled

Question 45:

• WAEC 2019

The maximum and minimum thermometer reads the

A. The maximum temperature during the day and the minimum temperature at night at all times.
B. The maximum temperature at night and minimum temperature during the day from the last reset
C. The maximum temperature at night and minimum temperature during the day at all times
D. The maximum temperature during the day and minimum temperature at night from the last reset