Current Electricity - Jamb Physics Past Questions and Answers

Question 61:

• JAMB 1991

A moving coil galvanometer of 300\(\Omega\) resistance gives full scale deflection for 1.0mA. The resistance R, of the shunt that is required to convert the galvanometer into a 3.0A ammeter is

A. 899.70\(\Omega\)
B. 10.00\(\Omega\)
C. 0.10\(\Omega\)
D. 0.01\(\Omega\)

Question 62:

• JAMB 1991

Which of the following obeys Ohm's Law?

A. Glass
B. Diode
C. All electrolytes
D. All metals

Question 63:

• JAMB 1991

Th internal resistance of each of the cells E1 and E2 Shown in the figure above is 2 Ohm. Calculate the total current in the circuit

A. 0.80A
B. 0.50A
C. 0.40A
D. 0.004A

Question 64:

• JAMB 1992

A wire of length 15m made of a material of resistivity 1.8 x 10^-6\(\Omega\)m has a resistance of 0.27\(\Omega\). Determine the area of the wire

A. 1.5 x 10^-4m²
B. 1.0 x 10^-4m²
C. 2.7 x 10^-5m²
D. 7.3 x 10^-6m²

Question 65:

• JAMB 1992

The heat produced in a conductor carrying an electric current is

A. Inversely proportional to the current and the resistance
B. Directly proportional to the current, resistance and the time
C. Inversely proportional to of the resistance, current and the time
D. Directly proportional to the square of the current, the resistance and the time