WAEC Physics Past Questions & Answers - Page 275

1,371.

In the diagram above, three identical lamps each of 100 W are connected in parallel across a potential difference of 250 V. Calculate the reading of the ammeter.

A.

7.5A

B.

2.5A

C.

1.2A

D.

0.8A

E.

O.4A

View answer & explanation

Correct answer is C

P = VI ; I = P/V = 100/250 = 0.4A each
Total current 3 x 0.4 = 1.2A

1,372.

The function of the magnanese (IV) oxide in a leclanche cell is to

A.

decrease the e.m.f. of the cell

B.

prevent local action in the cell

C.

prevent polarization in the cell

D.

increase the density of the electrolyte

E.

increase the resistance of the cell.

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,373.

A particle of charge 5C moves perpendicularly to a magnetic Held of magnitude C.01 T. If the velocity of the charge is 1.5ms'2, calculate the magnitude of the force exerted on the particle

A.

0.050 N

B.

0.075N

C.

0.0300N

D.

3.300N

E.

0.000N

View answer & explanation

Correct answer is B

F = eV = 0.01 x 5 x 1.5 = 0.075N

1,374.

Which of the following have the greatest penetrating power?

A.

Beta rays

B.

Alpha rays

C.

Gamma rays

D.

Electrons

E.

Neutrons

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,375.

The potential difference between two points A and B situated at a distance d apart is V. Which of the following expresses the magnitude of the electric field intensity between the two points assuming the field is uniform?

A.

Vd

B.

dV^-1

C.

Vd^-1

D.

V²d

E.

d²V

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

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