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WAEC Physics

Page 15

Which of the following statements about parallel plate capacitors is/are correct?

I. Capacitance of the capacitor is inversely proportional to the distance between the plates.
II. Capacitors can filter signals a.c. from d.c.
III. Capacitors can store charges

a.

I only

b.

I and II only

c.

II and III only

d.

I, II and III

The primary of a transformer has 100 turns and its secondary has 200 turns. If the voltage at the primary is 100V100 V, determine the voltage at the secondary.

a.

50V50 V

b.

100V100 V

c.

200V200 V

d.

400V400 V

Which of the following cases cannot produce total internal reflection?

a.

glass to water

b.

kerosene to air

c.

air to water

d.

water to ice

Which of the following statements is the correct reason for using soft iron in making the armature of an electric bell?

a.

It is a diamagnetic material

b.

It losses its magnetism readily

c.

It is not easily demagnetized

d.

It retains its magnetism for a long time

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