Waec Physics Past Questions and Answers

Question 66:

• WAEC 1988

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

A. I only
B. II only
C. III only
D. I & III only
E. I, II & III

Question 67:

• WAEC 1988

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.

A. 4 x 10 ²⁵J
B. 4 x 10²¹ J
C. 6.4 x 10²⁰ J
D. 6.4 x 10^-15 J
E. 2.5 x 10²⁰ J

Question 68:

• WAEC 1988

Which of the following is not an electromagnetic radiation?

A. X-ray
B. Radio waves
C. Sunlight
D. Sound waves
E. Infra-red radiation

Question 69:

• WAEC 1988

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?

A. 4 : 1
B. 2 : 1
C. 1 : 1
D. 1 : 2
E. 1 : 4

Question 70:

• WAEC 1988

During the same interval, it is observed that a train travels the same distance as does a lorry. The two vehicles therefore have the same

A. Uniform accelation
B. Instateneous velocity
C. Initial velocity
D. Average speed
E. Average velocity