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JAMB Physics Past Questions & Answers - Page 42

206.

The equilibrium position of objects in any field corresponds to situation of

equipotential energy

maximum potential energy

minimum potential energy

minimum kinetic energy

View answer & explanation

Correct answer is C

Potential energy = mgh = (mg)h = force × distance
⇒ 0 × d = 0

207.

The diagram shows a uniform meter rule AB which balances horizontally at the 90cm mark when a mass of 0.2kg is suspended from B. Calculate the mass of the meter rule.

0.05kg

0.20kg

0.80kg

1.00kg

View answer & explanation

Correct answer is A

M $_r$ (90 - 50) = 0.2(100 - 90)
40M $_r$ = 0.2 × 10

$_r$

0.05kg

208.

A body moves in SHM between two point 20m on the straight line Joining the points. If the angular speed of the body is 5 rad/s. Calculate its speed when it is 6m from the center of the motion

20 m/s

30 m/s

40 m/s

50 m/s

View answer & explanation

Correct answer is C

From two parts 20m apart
a = 10m, x = 6m, A = 5
V = ω $\sqrt{A^2 - X^2}$ = 5 $\sqrt{10^2 - 6^2}$ = 40m/s

209.

The volume of a stone having an irregular shape can be determined using?

meter rule

measuring cylinder

vernier calliper

micrometer screw gauge

View answer & explanation

Correct answer is B

The volume of object is the same as the volume of liquid displaced in a container such as measuring cylinder.

210.

Which of the following bodies, each with centre of gravity G, lying on a horizontal table, is/are in unstable equilibrium?

II only

III only

I & IV only

II & III only

View answer & explanation

Correct answer is B

- I & II are in neutral equilibrium. They will roll continuously on the table
- III is a body with high centre of gravity (unstable)
- IV is a body with high centre of gravity (stable)

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