Electrical Energy and Power - Jamb Physics Past Questions and Answers

Question 1:

• JAMB 2019

If the time of flight is 96seconds, calculate the horizontal range through the point of projection.

A. 84400m
B. 69000m
C. 61440m
D. 24000m

Question 2:

• JAMB 1978

The electric supply from Kainji Dam is transmitted at high voltages of the order hundreds of kilovolts but is converted to domestic use of about 220 volts by

A. Commutators
B. Transistors
C. Valves and diodes
D. Rectifiers
E. Transformers

Question 3:

• JAMB 1978

Every house supplied with electricity is provided with a box of fuses so that

A. The consumption of electricity can be recorded
B. People residing in the house will not have an electric shock if they touch a live wire
C. The total current drawn from the mains can be limited
D. The voltage supply can be stabilized
E. It serves as a standby supply when there is a power failure

Question 4:

• JAMB 1980

High Tension(H.T.) transmission means

A. To transmit a given amount of power, the tension in the conducting wire must be high
B. Heat is not lost when current is passed through a conductor
C. Heat is gained when a given power is transmitted
D. A big transformer is required to transmit power
E. Trasmission of power at low current and high voltage

Question 5:

• JAMB 1984

Which of the following can be described as high tension transmission?

A. High resistance and low voltage
B. Low current and high voltage
C. High current and low voltage
D. High voltage and zero current
E. High current and low resistance