Physics Past Questions and Answers

Which of the following have the greatest penetrating power?

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

Question 342:

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 343:

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 344:

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 345:

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.