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JAMB Physics Past Questions & Answers - Page 314

1,566.

A galvanometer of internal resistance 50 $\Omega$ has a full scale deflection for a current of 5mA. What is the resistance required to covert it to a voltmeter with full scale deflection of 10V?

1750 $\Omega$

1950 $\Omega$

2000 $\Omega$

2500 $\Omega$

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,567.

Three electric cells each of e.m.f 1.5V and internal resistance of 1.0 $\Omega$ are connected in parallel across an external resistance of $\frac{2}{3}$ $\Omega$ . Calculate the value of the current in the resistor

0.5 A

0.9 A

1.5 A

4.5 A

View answer & explanation

Correct answer is C

E.m.f = 1.5

r = $\frac{1 \times\ 1 \times 1}{(1 \times\ 1) + (1 \times\ 1) + (1 \times\ 1)}$

r = $\frac{1}{3}$ $\Omega$

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

I = $\frac{1.5}{\frac{1}{3}\ + \frac{2}{3}}$

I = 1.5A

1,568.

The electromagnetic waves that are sensitive to temperature changes are

X-rays

Gamma-rays

Ultra-violet rays

Infra-red rays

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,569.

Light of velocity 3 x 10⁸ms^-1 is incident on a material of reflective of index n. If the velocity of light is reduced to 2.4 x 10⁸ms^-1 in the material, what is n?

2.33

2.25

1.33

1.25

View answer & explanation

Correct answer is D

n = $\frac{3 \times\ 10^8}{2.4 \times\ 10^8}$

n = 1.25

1,570.

A boy on looking into a mirror observed that his face appeared to have grown bigger. The boy must have been looking at a

convex mirror with his face at the focus

concave mirror with his face between the focus and the mirror

concave mirror with his face at the focus

convex mirror with his face between the focus and the mirror

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

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