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JAMB Physics Past Questions & Answers - Page 249

1,241.

A load of 5N gives an extension of 0.56cm in a wire which obeys Hooke's law. What is the extension caused by a load of 20N?

1.12cm

2.14cm

2.24cm

2.52cm

View answer & explanation

Correct answer is C

$\frac{F_1}{e_1}$ = $\frac{F_2}{e_2}$

$\frac{5}{0.56}$ = $\frac{20}{e_2}$

e₂ = 2.24cm

1,242.

The mechanical advantage(MA) of an inclined plane depends on

its length

its height

the product of its length and height

the ratio of its length to its height

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,243.

If a beaker is filled with water it is observed that the surface of the water is not horizontal at the glass-water interface. This behavior is due to

friction

viscosity

surface tension

evaporation

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,244.

The coefficient of static friction between a 40kg crate and concrete surface is 0.25. Find the magnitude of the minimum force needed to keep the crate stationary on the concrete base inclined at 45° to the horizontal. [G = 10ms^-1]

400N

300N

283N

212N

View answer & explanation

Correct answer is D

momentum force = Rsin $\theta$ - $\mu$ Rcos $\theta$

Fm = (40 x 10 x sin 45) - (40 x 10 x 0.25 x cos 45)

= 212N

1,245.

A body rolls down a slope from a height of 100m. its velocity at the foot of the slope is 20ms^-1. What percentage of its initial potential energy is converted into kinetic energy? [g = 10ms^-1]

40%

35%

20%

15%

View answer & explanation

Correct answer is C

P.E = mgh = 1000m joules

K.E = $\frac{1}{2}$ mv² = 200m joules

%converted = $\frac{200m}{1000m}$ x 100

= 20%

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