Jamb Physics 1998 Past Questions and Answers

Question 36:

• JAMB 1998

Which of the following can be used to reduce local action in a Laclanche cell?

A. A carbon rod as the positive pole
B. Pure zinc as the negative pole
C. Potassium permanganate solution in contact with the positive pole
D. Common salt solution

Question 37:

• JAMB 1998

Find the work done in moving a 2 C charge between two points X and Y in an electric field if the potential difference is 100 volts

A. 50J
B. 100J
C. 200J
D. 400J

Question 38:

• JAMB 1998

A parallel plate capacitor has a common plate area of 5 x 10^-8m² and plate separation of 2 x 10³m, Assuming free space, What is the capacitance? [\(\varepsilon\)_o = 9.0 X 10^-12C²N^-1m^-2]

A. 2.25 x 10^-17F
B. 4.50 x 10^-17F
C. 2.25 x 10^-16F
D. 4.50 x 10^-16F

Question 39:

• JAMB 1998

The iron core of an induction coil is made from bundles of wire so as to

A. Minimize eddy-currents
B. Generate eddy-current
C. Prevent sparking at the contact breaker
D. Get the greatest posible secondary voltage

Question 40:

• JAMB 1998

Electricity is supplied to a school along a cable of total resistance 0.5\(\Omega\) with the maximum current drawn from the mains as 100A. The maximum energy dissipated as heat for 1 hr is

A. 3.6 x 10³J
B. 5.0 x 10³J
C. 3.0 x 10⁵J
D. 1.8 x 10⁷J