JAMB Physics Past Questions & Answers

676.

Two taxis leave benin and agbor some 80km apart at 1200hr as shown above. from the distance time graph shown the distance of their meeting point P, from Benin and the time of their meeting are

27km, 1218hr

29km, 1315hr

40km, 1418hr

53km, 1436hr

60km, 1500hr

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

677.

in a light experiment with a convex lens a student plotted a graph as shown above of the reciprocal of object distance (1)/u against the reciprocal of image distance (1)/v . the focal length of the lens is given as

slope of line PQ

Reciprocal of either OP or OQ

Length OP or OQ

area under the graph E ratio OP/OQ

View answer & explanation

Correct answer is B

The intercept on either of the axes of the graph of $\frac{1}{u}$ against $\frac{1}{v}$ gives the value of $\frac{1}{f}$ . Hence, the reciprocal of this intercecpt gives the value of the focal length.

678.

The wave motion above has a frequency

0.1Hz

0.2Hz

5Hz

10Hz

100Hz

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

679.

The effect of closing the key K in the circuit shown above would be to

increase the current by 0.6A

reduce the current by 0.6A

increase the current by 0.4A

keep the current unchanged

View answer & explanation

Correct answer is C

When K is open, the total resistance

R = 8 $\Omega$ + 2 $\Omega$ = 10 $\Omega$

I = $\frac{V}{R}$ = $\frac{6}{10}$

= 0.6A

When K is closed, we have

$\frac{1}{R}$ = $\frac{1}{8}$ + $\frac{1}{8}$

⇒ $\frac{1}{R}$ = $\frac{1}{4}$

⇒ R = 4 $\Omega$

The total resistance R = 4 $\Omega$ + 2 $\Omega$

= 6 $\Omega$

I = $\frac{6}{6}$

= 1A

Hence, I = 1A - 0.6A = 0.4A increase

680.

A body of mass 6kg rests on an inclined plane. The normal reaction is R and the limiting frictional force is F as shown in the image above. if F = 30N, and g = 10ms2 then the angle of inclination $\theta$ is

$15^{\circ}$

$30^{\circ}$

$45^{\circ}$

$60^{\circ}$

$75^{\circ}$

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

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