WAEC Physics Past Questions & Answers

1,551.

Which of the following is not a consequence of a force field?

wieght

surface tension

gravitational pull

magnetic force

electric force

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,552.

Two radioactive elements A and B have half-lives of 100 and 50 years respectively. Samples of A and B initially contain equal amounts/number of atoms. What is the ratio of the number of the remaining atoms of A to that of B after 200 years?

4 : 1

2 : 1

1 : 1

1 : 2

1 : 4

View answer & explanation

Correct answer is A

Given that a mass N of elements A and B exists, then:

For element A, after 100 years, we have A of mass N/2 remaining

After 200 years, we have A of mass $\frac{1}{2}\times\frac{N}{2}$ = $\frac{N}{4}$

For element B, after 50 years, we have B of mass N/2 remaining

After 100 years, we have B of mass $\frac{1}{2}\times\frac{N}{2}$ = $\frac{N}{4}$

After 150 years, we have B of mass $\frac{1}{2}\times\frac{N}{4}$ = $\frac{N}{8}$

After 200 years,we have B of mass $\frac{1}{2}\times\frac{N}{8}$ = $\frac{N}{16}$

Ratio: $(\frac{N}{4} : \frac{N}{16})$

= $4 : 16$ = $1 : 4$

1,553.

Which of the following is not an electromagnetic radiation?

X-ray

Radio waves

Sunlight

Sound waves

Infra-red radiation

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,554.

An electron of charge 1.6 x 10¹⁹C is accelerated in vacuum from rest at zero volt towards a plate of 40KV. Calculate the kinetic energy of the electron.

4 x 10 ²⁵J

4 x 10²¹ J

6.4 x 10²⁰ J

6.4 x 10^-15 J

2.5 x 10²⁰ J

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,555.

Which of the following is/are not affected by a magnetic field?
I. Neutrons
II. Cathode rays
III. Alpha particles

I only

II only

III only

I & III only

I, II & III

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

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