Question 696:

• JAMB 1992

When an ebolite rod is rubbed with fur, it has

A. No charge at all
B. A negative charge
C. A positive charge
D. Negative and positive charges

Question 697:

• JAMB 1992

Which of the following factors has no effect on the e.m.f. of a primary cell?

A. Temperature
B. Size of the cell
C. Nature of the plate
D. Nature of the electrolyte

Question 698:

• 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 699:

• JAMB 1992

A 5-v battery is connected across the plates of a 2.0\(\mu\)F uncharged parallel plate capacitor. The charge on the capacitor after a long time is

A. 2.5\(\mu\)C
B. 10.0\(\mu\)C
C. 20.0\(\mu\)C
D. 50.0\(\mu\)C

Question 700:

• JAMB 1992

Which of the following apparatus will require the smallest fuse rating for its protection?

A. 60W, 240V
B. 60W, 40V
C. 40W, 12V
D. 40W, 5V