Waec Physics 1993 Past Questions and Answers

Question 41:

• WAEC 1993

Which of the following have the greatest penetrating power?

A. Beta rays
B. Alpha rays
C. Gamma rays
D. Electrons
E. Neutrons

Question 42:

• WAEC 1993

A particle of charge 5C moves perpendicularly to a magnetic Held of magnitude C.01 T. If the velocity of the charge is 1.5ms'2, calculate the magnitude of the force exerted on the particle

A. 0.050 N
B. 0.075N
C. 0.0300N
D. 3.300N
E. 0.000N

Question 43:

• WAEC 1993

The function of the magnanese (IV) oxide in a leclanche cell is to

A. Decrease the e.m.f. of the cell
B. Prevent local action in the cell
C. Prevent polarization in the cell
D. Increase the density of the electrolyte
E. Increase the resistance of the cell.

Question 44:

• WAEC 1993

In the diagram above, three identical lamps each of 100 W are connected in parallel across a potential difference of 250 V. Calculate the reading of the ammeter.

A. 7.5A
B. 2.5A
C. 1.2A
D. 0.8A
E. O.4A

Question 45:

• WAEC 1993

Electrical resistance is the property of an electrical conductor that causes electrical energy to be converted into

A. Mechanical energy
B. Solar energy
C. Heat energy
D. Magnetic energy
E. Chemical energy.