WAEC Physics Past Questions & Answers - Page 236

1,176.

A lamp marked 100W, 250V is lit for 10 hours. If it operates normally and 1KWh of electrical energy costs 2k, what is the cost of lighting the lamp?

A.

1k

B.

2k

C.

5k

D.

10k

E.

20k

View answer & explanation

Correct answer is B

100W X 10h = 1000Wh = 1KWh thus cost is 2k

1,177.

A car fuse is marked 15A and operates normally on a 12V battery. Calculate the resistance of the fuse wire

A.

180Ω

B.

27Ω

C.

3Ω

D.

1.3Ω

E.

0.8Ω

View answer & explanation

Correct answer is E

R = \(\frac{V}{I} = \frac{12}{15}\) = 0.8Ω

1,178.

A rectangular coil can rotate in a magnetic field. The two ends of the coil are soldered respectively to the two halves of a commutator. Two carbon brushes are made to press lightly against the commutator and when these are connected in a circuit with a battery and a rheostat, the coil rotates. This is a description of

A.

a moving coil ammeter

B.

a D.C generator

C.

a D.C electric motor

D.

An induction coil

E.

An A.C generator

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,179.

A battery of e.m.f 10V and internal resistance 2Ω is connected to a resistance of 6Ω. Calculate the p.d

A.

8.75V

B.

7.50V

C.

5V

D.

2.50V

E.

1.25V

View answer & explanation

Correct answer is B

V = E - Ir = 10V - \(\frac{10 \times 2}{8}\) = 7.5V

1,180.

Which of the following scientists postulated that moving particles exhibit wave properties?

A.

Niels Bohr

B.

Ernest Rutherford

C.

Werner Heisenberg

D.

Louis de Broglie

E.

Erwin Schroedinger

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

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