Electric Cells - Jamb Physics Past Questions and Answers

Question 11:

• JAMB 1998

The electrochemical equivalent of a metal is 1.3 x 10^-7kgC^-1. The mass of the metal which 2.0 x 10⁴C of electricity will deposit from a suitable electrolyte is

A. 6.5 x 10^-2kg
B. 2.6 x 10^-2kg
C. 6.5 x 10^-3kg
D. 2.6 x 10^-3kg

Question 12:

• JAMB 2001

In a Daniel cell, the depolarizer, positive and negative electrodes are respectively

A. Copper sulphate, copper and zinc
B. Manganese dioxide, carbon and zinc
C. Sulphuric acid, lead oxide and lead
D. Potassium hydroxide, nickel and iron.

Question 13:

• JAMB 2002

At what frequency would a capacitor of 2.5μF
used in radio circuit have a resistance of 250Ω

A. π/800 Hz
B. 800/π Hz
C. 200Ï€ Hz
D. 2000Ï€ Hz

Question 14:

• JAMB 2003

The most suitable cell used for short interval switches in electric bells is a

A. Lead- acid accumulator
B. Daniel cell
C. Leclanche cell
D. Nickel iron accumulator

Question 15:

• JAMB 2004

Which of the following is an electrolyte?

A. Paraffin
B. Sugar solution
C. Grape fruit
D. Alcohol