JAMB Physics Past Questions & Answers - Page 112

556.

Which of the following is NOT part of an a.c generator?

A.

Commutator

B.

Armature

C.

Field magnet

D.

Carbon brushes

E.

Slip rings

View answer & explanation

Correct answer is A

The general A.C. generator has all the listed components except the commutator.

557.

A radioactive substance has a half-life of 3 minutes. After 9 minutes, the count rate was observed to be 200. What was the count rate at zero time?

A.

200

B.

1200

C.

1600

D.

2400

E.

4800

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

558.

Two forces forming a couple are separated by a distance of 25cm. If one of the forces equals 40N, what is the moment of the couple?

A.

1000 Nm

B.

500 Nm

C.

10 Nm

D.

5 Nm

E.

1.6 Nm

View answer & explanation

Correct answer is C

The moment (or torque) of a couple is calculated by multiplying the size of one of the force by the perpendicular distance between the two forces.

Given: F = 40N; d = 25cm = 0.25m

Moment = 40 x 0.25 = 10Nm.

559.

A solid weights 5.0 N in air, 4.2 N in water and 4.4 N in liquid Y. Calculate the relative density of liquid Y.

A.

0.75

B.

0.88

C.

0.95

D.

1.13

E.

1.33

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

560.

The heat from a fire in a closed room reaches someone far away in the room, mainly by

A.

reflection

B.

diffusion

C.

conduction

D.

radiation

E.

convection

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.


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