Question 4201:

• 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 4202:

• 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 4203:

• 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 4204:

• 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

Question 4205:

• WAEC 2019

An a.c. the generator can be converted to a d.c. generator by replacing the

A. Commutator with an armature
B. Armature with a commutator
C. Commutator with slip rings
D. Slip rings with a commutator