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JAMB Physics Past Questions & Answers - Page 99

491.

The crackling noise produced by aluminum roofing sheets on a house during a hot sunny day is a result of

thermal equilibrium of the sheets

conduction of heat by the sheets

contraction of the sheets

expansion of the sheets

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

492.

A body of mass 1000kg is released from a height of 10m above the ground. Determine its kinetic energy just before it strikes the ground .[g = 10ms^-2]

10J

10³J

10⁴J

10⁵J

View answer & explanation

Correct answer is D

Ke = mgh

Ke = Pe

$\frac{1}{2}$ MV² = mgh

Ke = 1000 x 10 x 10

Ke = 100000J

Ke = 10⁵J

493.

A uniform bar AB is balanced on a knife-edge which is 60cm from B by a mass of 22g which hangs at C 10cm from A. Calculate the mass of the bar.

133.2g

66.0g

60.0g

22.0g

View answer & explanation

Correct answer is B

clockwise movement = anticlockwise movement

w x 10 = 22 x 30

w = $\frac{22 \times 30}{10}$

w = 66.0g

494.

A bullet fired vertically upwards reaches a height of 500m. Neglecting air resistance, calculate the magnitude of the initial velocity of the bullet. [g = 10ms^-2]

500.0ms^-1

100.0ms^-1

70.0ms^-1

50.0ms^-1

View answer & explanation

Correct answer is B

V² = U² + 2gs

V² = 0

V² = 2gs

h = 500m

g = 10ms^-2

V² 2 x 10 x 500

V² = 10,000

V = $\sqrt{10000}$

V = 100ms^-1

495.

Two strings each inclined at an angle 30o to the horizontal are used to hold a bucket of water weighing 20N. Calculate the tension i n each string

20 (\sqrt{3}\)N

20N

10 (\sqrt{3}\)N

10N

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

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