Physics Past Questions and Answers

A parallel plate capacitor of capacitance 600\(\mu F\) has a potential difference of 200V between its plates. Calculate the charge on either plate of the capacitor

A 1.2C
B 3.3C
C 3330.0C
D 12.0000.0C

Question 1052:

a chemical cell of internal resistance 1\(\Omega\) supplies electric current to an external resistor of resistance 3\(\Omega\). Calculate the efficiency of the cell

A 75%
B 50%
C 33%
D 25%

Question 1053:

An electric lamp is rated 240V, 40W. What is the cost of running the lamp for 72 hours if the electricity authority charges N2.50 per kWh?

A N7.20
B N18.00
C 180.00
D N720.00

Question 1054:

Which of the following statements explains lost volt in an electric circuit? The

A Total p.d from a source to maintain a flow of current through the circuit as well as the source
B P.d to drive current through the circuit component except the source
C P.d across all external components connected to the source of electricity
D P.d across the internal resistance of the cell

Question 1055:

A constantan wire has a cross sectional area of 4 x 10^-8m² and a resistivity of 1.1 x 10^-6\(\Omega\)m. If a resistor of resistance 11\(\Omega\) is to be made from this wire, calculate the length of the wire required

A 0.4m
B 0.8m
C 2.5m
D 5.0m