WAEC Physics Past Questions & Answers - Page 250

1,246.

Which of the following is not part of the electromagnetic spectrum?

A.

Radio wave

B.

Gamma ray

C.

Infra-red ray

D.

Alpha particle

E.

X-ray

Correct answer is D

No explanation has been provided for this answer.

1,247.

Which of the following substances is most viscous at room temperature?

A.

Water

B.

Alcohol

C.

Petrol

D.

Palm oil

E.

Kerosine

Correct answer is D

No explanation has been provided for this answer.

1,248.

What is the decay constant of a radioactive element whose half-life is 3 seconds

A.

0.132s-1

B.

0.23s-1

C.

0.347s-1

D.

0.693s-1

E.

0.924s-1

Correct answer is B

No explanation has been provided for this answer.

1,249.

The resistance in a series R-C circuit is 5 Ω. If the impedance of the circuit is 13 Ω, calculate the reactance of the capacitor

A.

65 Ω

B.

18 Ω

C.

16 Ω

D.

14 Ω

E.

12 Ω

Correct answer is E

No explanation has been provided for this answer.