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JAMB Physics Past Questions & Answers - Page 344

1,716.

A piece of cork floats in a liquid. What fraction of its volume will be immersed in the liquid?

[Density of the cork = 0.25 x 10³kgm^-3, Density of the liquid = 1.25 x 10³kgm^-3]

0.8

0.5

0.2

0.1

View answer & explanation

Correct answer is C

$\frac{0.25 \times 10^3} {1.25 \times 10^3}$ = 0.2

1,717.

Calculate the apparent weight loss of a man weighing 70kg in an elevator moving downwards with an acceleration of 1.5ms^-2.

[g = 10ms^-2]

686N

595N

581N

105N

View answer & explanation

Correct answer is D

Wt loss = mg - m (g - a)

= 70 x 10 - 70 (10 - 1.5) = 105N

1,718.

A train with an initial velocity of 20ms^-1 is subjected to a uniform deceleration of 2m^-2. The time required to bring the train to a complete halt is?

10s

20s

40s

View answer & explanation

Correct answer is B

t = $\frac{v - u}{a}$ = $\frac{0 - 20}{-2}$ = 10s

1,719.

A simple pendulum of length 0.4m has a period of 2s. What is the period a similar pendulum of length 0.8m at the same place?

2 $\sqrt{2}s$

$\sqrt{2}s$

View answer & explanation

Correct answer is C

T₂ = $\sqrt{\frac{L^2 \times T_1^2}{L_1}}$

= $\sqrt{\frac{0.8 \times 2^2}{0.4}}$

= 2 $\sqrt{2}s$

1,720.

The pair of physical quantities that are scalar only are ?

volume and area

moment and momentum

length and displacement

Impulse and time

View answer & explanation

Correct answer is A

This is because volume and the area have only magnitude but no direction

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