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WAEC Physics Past Questions & Answers - Page 44

216.

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

Correct answer is D

No explanation has been provided for this answer.

217.

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

Correct answer is D

No explanation has been provided for this answer.

218.

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

Correct answer is A

No explanation has been provided for this answer.

219.

An 800 kg car moving at 80 km hr1 collides with a 1200 kg car moving at 40 km hr1 in the same direction. If the cars stick together, calculate their common velocity.

A.

60 km hr1

B.

8 km hr1

C.

40 km hr1

D.

56 km hr1

Correct answer is B

From momentum conservation 

(800 x 80) - (1200 x 40) 

= (800 + 1200) V

= 64000 - 48000 = 2000V

16000 = 2000V

V = 160002000

= 8kmh1 

The common velocity = 8kmhr1

220.