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JAMB Physics Past Questions & Answers - Page 298

1,486.

Two capacitors R₁ = 4 $\Omega$ and R₂ = 5 $\Omega$ are connected in parallel across a potential difference. If P₁ and P₂ represent power dissipated in R ₁ and R₂ respectively, then the ratio P₁ : P₂ is

4 : 5

5 : 4

16 : 25

25 : 16

View answer & explanation

Correct answer is B

P₁ = $\frac{V^2_1}{R_1}$ and P₂ = $\frac{V^2_2}{R_2}$

P₁R₁ = P₂R₂

4P₁ = 5P₂

$\frac{p_1}{p_2}$ = $\frac{5}{4}$

= 5 : 4

1,487.

A capacitor 8 $\mu$ F is charged to a potential difference of 100V. The energy stored by the capacitor is

1.0 x 10⁴J

8.0 x 10J

1.25 x 10J

4.0 x 10^-2J

View answer & explanation

Correct answer is D

Energy = $\frac{1}{2}$ CV²

= $\frac{1}{2}$ x 8 x 10^-6 x (100)²

1,488.

When a biro pen rubbed on a dry silk cloth is moved very close to a piece of paper on a dry table, the pen is found to pick up the paper. This is because

both the pen and the cloth are magnetized

the pen is magnetized but the cloth is not

the pen is charged while the cloth is magnetized

both the pen and the cloth are charged

View answer & explanation

Correct answer is D

They are all charged either positively or negatively

1,489.

Which of the following has the lowest internal resistance when new?

leclanche cell

Daniel cell

Accumulator

Torch battery

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,490.

If the Nigeria flag (green, white, green) is viewed in pure yellow light, which of the following set of colours would be observed on the flag?

Green, yellow, green

Red, yellow, red

black, yellow, black

Green, white, green

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

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