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JAMB Physics Past Questions & Answers - Page 212

1,056.

Which of the following machines does NOT apply the lever principle?

claw hammer

wheel barrow

single moving pulley

sugartongs

nutcrackers

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,057.

A mango fruit drops from a branch 10m above the ground, just before hitting the ground its velocity is (g = 10ms^-2)

10√2ms^-1

10ms^-1

100ms^-1

5√2ms^-1

200ms^-1

View answer & explanation

Correct answer is A

Using, V² = U² + 2gs

V² = 0² + (2 x 10 x 10)

V = 10√2ms^-1

1,058.

The force responsible for holding the moon in its orbit around the earth against the gravitational pull of the earth is

centrifugal

rotational

reaction

centripetal

tractional

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,059.

An electric iron is rated at 1000watts, 250v. The corresponding maximum resistance and accompanying current is

62.5A, 4.0 $\Omega$

16.0A, 62.5 $\Omega$

62.5A, 16.0 $\Omega$

4.0A, 62.5 $\Omega$

4.0A, 250 $\Omega$

View answer & explanation

Correct answer is D

R = $\frac{V^2}{R}$ = IV ; R = $\frac{V^2}{P}$ and I = $\frac{P}{V}$

R = $\frac{(250)^2}{100}$ and I = R = $\frac{1000}{250}$

R = 62.5 $\Omega$ and I = 4A

1,060.

The echo of a sounder from the bottom of an ocean is heard 2.5 seconds later. If the speed of sound in water is 1,400ms^-1, the depth of the ocean is

1,750m

3,500m

1,400m

2,800m

2,100m

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

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