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JAMB Physics Past Questions & Answers - Page 305

1,521.

Which of the following is required to convert a milliammeter to an ammeter?

A high resistance in parallel

A high resistance in series

A low resistance in parallel

A low resistance in series

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,522.

If the maximum voltage across a 100ohms resistor is 20V, then the maximum power it can dissipate is

5.00W

4.00W

2.00W

25W

View answer & explanation

Correct answer is B

P = $\frac{V^2}{R}$

= $\frac{20 \times 20}{100}$

= 4W

1,523.

An electric current of 2 amperes flows in a heating coil of resistance 50 ohms for 3 minutes 20 seconds. Determine the heat produced

0.5kJ

8.0kJ

20.0kJ

40.0kJ

View answer & explanation

Correct answer is D

Heat energy = Elect. energy

heat energy= I²RT

= 2 X 2 X 50 X 200

= 40000J

to convert to kJ, divide J by 1000

hence, $\frac{40000}{1000}$ = 40kJ

1,524.

The purpose of a dielectric material in a parallel plate capacitor is to

increase its capacitance

decrease its capacitance

insulate the plate from each other

increase the magnetic field between the plates

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,525.

A 12V battery has an internal resistance of 0.5W.If a cable of 1.0W resistance is connected across the two terminals of the battery, the current drawn from the battery is

16.0A

8.0A

0.8A

0.4A

View answer & explanation

Correct answer is B

I = $\frac{E.m.f}{R + r}$

= $\frac{12}{1 + 0.5}$

I = 8A

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