Physics

Physics past questions and answers from WAEC and JAMB

Page 33

Which of the following factors has no effect on the e.m.f of a primary cell?

Nature of the plates

Size of the cell

Temperature

Nature of the electrolyte

A lead bullet of mass $0.05 kg$ is fired with the velocity of $200m/s$ into a lead block of mass $0.95 kg$ . given that the lead block can move freely, the final kinetic energy after impact is

150 J

100 J

50 J

200 J

Heat transfer by convection is due to the

Increased vibration of the molecules of the liquid about their mean position

Variation of density of the liquid

Expansion of the liquid as it is heated

Latent heat of vaporization of the liquid

The pitch of an acoustic device can be decreased by

Decreasing the loudness

Increasing the amplitude

Increasing the frequency

Decreasing the intensity

First