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JAMB Physics Past Questions & Answers - Page 48

236.

In which of the points labelled A, B, C, D and E on the conductor shown would electric charge tend to concentrate most

Correct answer is D

- Charge are mostly concentrated at the outermost part of a hollow conductor
- Charge are also mostly concentrated at the pointed ends or places with high density point.

237.

Any line or section taken through an advancing wave in which all the particles are in the same phase is called the

wavelength

wave coast

wave trough

wave front

View answer & explanation

Correct answer is D

Wave front is a line or section taken through an advancing wave in which the particles are in phase.

238.

A car moving at 20m/s with its horn blowing (f = 1200Hz) is chasing another car going at 15m/s. What is the apparent frequency of the horn as heard by the driver being chased?

1.22KHz

2.40KHz

8.12KHz

1.22Hz

View answer & explanation

Correct answer is A

$_1$

f(v - v

$_o$ )

v - v

$_s$

1200(340 - 15)

340 - 20

1.22KHz

239.

The Earth's magnetic equator passes through Jos in Nigeria. At Jos, the

angle of variation is zero

magnetic declination is 90

angle of dip is zero

horizontal component at the Earth's field is zero

View answer & explanation

Correct answer is C

- angle of dip is zero at the magnetic equator
- angle of variation is the same as angle of declination.

240.

Calculate the velocity ratio of a screw jack of pitch 0.2cm if the length of the tommy bar is 23cm

230 $\pi$

23 $\pi$

70 $\pi$

140 $\pi$

View answer & explanation

Correct answer is A

P = 0.2cm, L = r = 23cm

2πr

2πL

2π×23

0.2

230π

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