Electric Cells - Jamb Physics Past Questions and Answers

Question 16:

• JAMB 2006

The electrolyte in the Nickei-iron (Nife) accumulator is

A. Potassium hydroxide solution
B. Dilute tetraoxosulphate(VI)acid
C. Copper tetraoxosulphate(VI)solution
D. Ammonium chloride solution

Question 17:

• JAMB 2012

A radio is operated by eight cells each of e.m.f. 2.0V connected in series. If two of the cells are wrongly connected, the net e.m.f. of the radio is

A. 8V
B. 10V
C. 12V
D. 16V

Question 18:

• JAMB 2012

A cell of internal resistance 1Ω supplies current to an external resistor of 3Ω. The efficiency of the cell is

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

Question 19:

• JAMB 2012

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 20:

• JAMB 2015

A good electric cell should have the following except

A. A minimum of polarization effect
B. A long life
C. A cheap and safe electrolytes
D. Cost and dangerous of the cell