Waec Physics 2000 Past Questions and Answers

Question 41:

• WAEC 2000

If a bar magnet is accidentally broken into three pieces as shown in the diagram above, the polarities of P and Q respectively are

A. S and S
B. N and S
C. N and N
D. S and N

Question 42:

• WAEC 2000

An inductor of inductance 10H carries a current of 0.2A. Calculate the energy stored in the inductor

A. 0.1J
B. 0.2J
C. 1.0J
D. 2.0J

Question 43:

• WAEC 2000

calculate the inductance of an inductor whose reactance is one ohm at 50 Hz.

A. 2.00 x 10^-2H
B. 6.36 x 10^-2H
C. 3.18 x 10^-2H
D. 4.55 x 10^-2H

Question 44:

• WAEC 2000

Borh's theory provides evidence for the

A. Structure of the atom
B. Positive charge of an electron
C. Existence of energy level in the atom
D. Positive charge on a proton

Question 45:

• WAEC 2000

A nuclide \(^{202}_{84} Y\) emits in succession an \(\alpha-particle\) and a \(\beta-particle\). The atomic number of the resulting nuclide is

A. 198
B. 83
C. 82
D. 80