Physics Past Questions

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641

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

View Answer & Discuss (1) WAEC 1988

642

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

View Answer & Discuss (6) WAEC 1988

643

Which of the following is not an electromagnetic radiation?

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

View Answer & Discuss WAEC 1988

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644

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