Jamb Physics 1978 Past Questions and Answers

Question 26:

• JAMB 1978

In order to convert a galvanometer into an ammeter

A. A low resistance shunt is connected in parallel
B. A low resistance shunt is connected in series
C. A medium resistance shunt is connected in series
D. A high resistance shunt is connected in parallel
E. A high resistance shunt is connected in series

Question 27:

• JAMB 1978

In a D.C. circuit, a 10 microfarad (mf) capacitor is placed in series with a 10 0hm resistor. The total resistance of the combination is

A. 10 ohms
B. 1 ohms
C. Zero
D. 20 ohms
E. Infinite

Question 28:

• JAMB 1978

On an a.c generator, which of the following does not apply?

A. Field magnet
B. Commutator
C. Armature
D. Slip rings
E. Carbon brushes

Question 29:

• JAMB 1978

Why is it impossible for the lines of force of an electric field to cross one another?

A. Like charges repel each other
B. A charged particle is deflected by an eletric field
C. Like charges are arranged on the same line of force
D. A positively charged particle can travel in only one direction at any time
E. None of these is correct

Question 30:

• JAMB 1978

A potential difference of 6v is used to produce a current of 5A for 200s through a heating coil. The heat produced is

A. 4800 cal
B. 6000 cal
C. 2400J
D. 240k cal
E. 6000J