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JAMB Physics Past Questions & Answers - Page 266

1,326.

Which of the following is most suitable for protecting the circuit of 2000W electric iron connected to a 250V mains?

13A

View answer & explanation

Correct answer is B

P = IV $\Rightarrow$ I = $\frac{2000}{250}$

= 8A

1,327.

Which of the following is an essential physical property of the wires used for making fuses?

low density

high thermal conductivity

low electrical resistivity

low melting point

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,328.

The total energy required to send a unit positive charge round a complete electrical circuit is the

kinetic energy

potential difference

electromotive force

electrical energy

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,329.

When a known standard resistor of 2 $\Omega$ is connected to the 0.0cm end of a meter bridge, the balance point is found to be at 55.0cm. What is the value of the unknown resistor?

1.10 $\Omega$

1.64 $\Omega$

2.44 $\Omega$

27.50 $\Omega$

View answer & explanation

Correct answer is B

$\frac{R_1}{R_2}$ = $\frac{L_1}{R_2}$

$\frac{2}{R_2}$ = $\frac{55}{45}$

R = 1.64 $\Omega$

1,330.

Three cells each of e.m.f. 1.5v and an internal resistance of 1.0 $\Omega$ are connected in parallel across a load resistance of 2.67 $\Omega$ . Calculate the current in the load?

0.26A

0.41A

0.50A

0.79A

View answer & explanation

Correct answer is C

E = 1.5v

r_T = $\frac{1 \times 1\times 1}{(1\times1)+ (1\times1) +(1\times1)}$

E.m. f = I(R + r) = 0.33 $\Omega$

1.5 = I(2.67 + 0.33)

I = 0.5A

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