Question 741:

• JAMB 1993

A simple cell with mercury-amalgamated zinc electrode prevents

A. Local actions
B. Polarization
C. Buckling
D. Degradation

Question 742:

• JAMB 1993

The terminal voltage of a battery is 4.0V when supplying a current of 2.0A, and 2.0V when supplying a current of 3.0A. The internal resistance of the battery is

A. 0.5 \(\Omega\)
B. 1.0\(\Omega\)
C. 2.0\(\Omega\)
D. 4.0\(\Omega\)

Question 743:

• JAMB 1993

A current of 100mA passes through a conductor for 2 minutes. The quantity of electricity transported is

A. 200C
B. 50C
C. 12C
D. 0.002C

Question 744:

• JAMB 1993

A parallel plate capacitor of area 10cm² in vacuum has a capacitance of 10^-2\(\mu\)F. What is the distance between the plates?(e[sub][/sub] = 9 x 10^-12fm)

A. 9 x 10^-13m
B. 9 x 10^-7m
C. 9 x 10^-3m
D. 9 x 10⁷m

Question 745:

• JAMB 1993

A 40-W instrument has a resistance of 90\(\Omega\). On what voltage should it be operated normally?

A. 60V
B. 150V
C. 225V
D. 3600V