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JAMB Physics Past Questions & Answers - Page 229

1,141.

Which of the following methods CANNOT be used to produce a steel magnet? The

passing of an electric current through a solenoid

repeated stroking of the specimen with a magnet

repeated stroking of the specimen in opposite directions with magnets

heating of the specimen

hammering of the specimen in the earth's magnetic field

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,142.

If the distance between two stationary charged particle is doubled, the magnitude of the electro-static force between them will be

doubled

halved

a quarter of its former value

unchanged

four times the original value

View answer & explanation

Correct answer is C

F $\alpha$ $\frac{1}{d^2}$

F x d² = constant

F₁ x (d₁)² = F₂ x (d₂)²

d₂ = 2d₁

F₁ x (d₁)² = F₂ x (2d₁)²

F₂ = $\frac{1}{4}$ F₁

1,143.

A charge of one coulomb liberates 0.0033g of copper in an electrolytic process. How long will it take a current of 2A to librate 1.98g of copper in such a process?

5 mins

30 mins

50 mins

60 mins

120 mins

View answer & explanation

Correct answer is A

0.0033g = 1 coulomb

1.98gs = 1.98 x 1

= 600 cou.

Q = It

600 = 2 x t

t = 300sec = 5 mins

1,144.

A narrow beam of white light can be split up into different colours by a glass prism. The correct explanation is that

white light is an electromagnetic wave

the prism has all the colours of the white light

white light has undergone total internal reflection in the prism

different colours of white light travel with different speeds in glass

white ligth consist of yellow, green and red colours

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,145.

Two rays of light from a point below the surface of water are equally inclined to each other at 60^o in water. What is the angle between the rays when they emerge into air? (Take the refractive index of water to be $\frac{4}{3}$ )

41.8^o

44.1^o

60.0^o

83.6^o

120.0^o

View answer & explanation

Correct answer is D

$\frac{4}{3}$ = $\frac{sin r_1}{sin 30}$ and $\frac{4}{3}$ = $\frac{sin r_2}{sin 30}$

r₁ = 41.8^o and r₂ = 41.8^o

angle between them = r₁ + r₂

= 83.6^o

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