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JAMB Physics Past Questions & Answers - Page 268

1,336.

In a resonance tube experiment, the effective length of the air column for the first resonance is 20cm when set into vibration by a tuning fork of frequency 480Hz. Neglecting and effect, the velocity of sound in air is

A.

96ms-1

B.

255ms-1

C.

340ms-1

D.

384ms-1

View answer & explanation

Correct answer is D

λ = 4(L + C) ; where C = o

λ = 4 x 20 = 80cm

V = λF

= 80 x 10-2 x 480 = 384ms-1

1,337.

When light is incident on an object which is magenta in colour, which of the following colour would be absorbed?

A.

Red and blue

B.

Green only

C.

Red and green

D.

Red only

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,338.

For a short sighted person, light rays from a point on a very distant object is focused

A.

in front of the retina

B.

on the retina by a converging lens

C.

behind the retina by a diverging lens

D.

in front of the retina, a distance 2F from the lens

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,339.

What must be the distance between an object and a converging lens of focal length 20cm to produce an erect image two times the object height?

A.

20cm

B.

15cm

C.

10cm

D.

5cm

View answer & explanation

Correct answer is C

F = uvu+v; v = 2u

20 = ux−2uu+(−2u); u = 10cm

1,340.

A boy looks at the image of an object in a plane mirror. He observes two images, a main bright one and the other faint. The observed images result from?

A.

reflection only

B.

refraction only

C.

diffraction and interference

D.

reflection and refraction

E.

reflection and diffraction

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.


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