JAMB Physics Past Questions & Answers - Page 49

241.

The point at which the molecules of a loaded wire begin to slide across each other resulting in a rapid increase in extension is

A.

yield point

B.

proportionality point

C.

deformation point

D.

elastic point

Correct answer is A

-yield point is where a small increase in load produces a large extention.

242.

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

A.

A

B.

B

C.

C

D.

E

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.

243.

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

A.

wavelength

B.

wave coast

C.

wave trough

D.

wave front

Correct answer is D

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

244.

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?

A.

1.22KHz

B.

2.40KHz

C.

8.12KHz

D.

1.22Hz

Correct answer is A

f\(_1\) = f(v - v\(_o\))
v - v\(_s\)
= 1200(340 - 15)
340 - 20
= 1.22KHz

245.

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

A.

angle of variation is zero

B.

magnetic declination is 90

C.

angle of dip is zero

D.

horizontal component at the Earth's field is zero

Correct answer is C

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