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JAMB Physics Past Questions & Answers - Page 244

1,216.

A current of 0.5A flows through a resistor when connected to a 40-V battery. How much energy is dissipated in 2 minutes?

1200J

1500J

2400J

96000J

View answer & explanation

Correct answer is C

Electrical energy = IVT

= 0.5 x 40 x 2 x 60

= 2400J

1,217.

When a transformer has more secondary windings than primary windings, it?

has a smaller secondary current

has a greater power output

is a step-down transformer

increases the total energy output

View answer & explanation

Correct answer is A

A transformer that increases the voltage from primary to secondary (more secondary winding turns than primary winding turns) is called a step-up transformer.

1,218.

Two capacitance of 6 $\mu$ F and 8 $\mu$ F are connected in series. What additional capacitance must be connected in series with this combination to give a total of 3 $\mu$ F

3 $\mu$ F

16 $\mu$ F

24 $\mu$ F

30 $\mu$ F

View answer & explanation

Correct answer is C

3 = $\frac{6 \times 8 \times c}{(6 \times 8) + (6 \times c) + (8 \times c}$

therefore, C = 24 $\mu$ F

1,219.

If the angle of declination in a place is 10°E, calculate the true geographic bearing if the compass reads N40°E

N50^oE

N40^oE

N30^oE

N25^oE

View answer & explanation

Correct answer is A

The true declination is calculated by adding the reading of compass bearing to the declination at that place.

= N40°E + 10° = N50°E

1,220.

Four lenses are being considered for use as a microscope objective. Which of the following focal lengths is most suitable?

-5mm

+5mm

-5cm

+5cm

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

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