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JAMB Physics Past Questions & Answers - Page 267

1,331.

Which of the following is a vector?

Electric charge

Electric field

Electrical potential difference

Electrical capacitance

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,332.

Which of the following statements are true of an insulated charged body carrying positive charge?

i. it contains excess positive charges.
ii. it creates an electric field.
iii. it possesses potential energy.
iv. it carries electric current.

i and iv only

i and ii only

i, ii, iii only

i, ii, iii and iv

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,333.

One of the properties of the earth's magnetic field is that the

north pole lies in the northern hemisphere

geographic and magnetic meridians coincide

earth's magnetic flux is entirely horizontal at a place where the magnetic dip is zero

earth's magnetic flux is entirely vertical at a place where the magnetic dip is zero

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,334.

A sonometer wire of length 100cm under a tension of 10N, has a frequency of 250Hz. Keeping the length of the wire constant, the tension is adjusted to produce a new frequency of 350Hz. The new tension is

5.1N

7.1N

14.0N

19.6N

View answer & explanation

Correct answer is D

$\frac{F_1}{F_2}$ = $\sqrt\frac{T_1}{T_2}$

$\frac{250}{350}$ = $\sqrt\frac{10}{T_2}$

T₂ = 19.6N

1,335.

An organic pipe closed at one end is 80cm long. Determine the frequency of the fundamental note assuming that the speed of sound in air is 340ms-1

106Hz

213Hz

318Hz

425Hz

View answer & explanation

Correct answer is A

$\lambda$ = 4L

= 4 x 80 = 320cm

Converting 320cm to m, we have 3.2m

F = $\frac{V}{\lambda}$

= $\frac{340}{3.2}$

= 106.25Hz

$\approxeq$ 106Hz

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