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WAEC Physics Past Questions & Answers - Page 18

86.

The linear expansivity, $\alpha$ , and cubic expansivity, $\gamma$ , of a material are related by the equation?

$\gamma$ =a

$\gamma$ =3 $\alpha$

$\gamma$ =2a

$\gamma$ = $\frac{1}{3} \alpha$

View answer & explanation

Correct answer is B

cubic and linear expansivity are related by this equation. γ=3α.

87.

The length of a simple pendulum is increased by a factor of four. By what factor is its period increase?

0.5 $\pi$

2 $\pi$

View answer & explanation

Correct answer is B

The period of a simple pendulum is doubled, when its length is made four times.

88.

From the principle of flotation, a body sinks in a fluid until it displace a quantity equal to its own?

density

mass

weight

volume

View answer & explanation

Correct answer is C

Archimede's Principle states that a body immersed in a fluid experiences an upthrust equal to the weight of the fluid displaced, and this is fundamental to the equilibrium of a body floating in still water.

89.

The area under a force-time graph represents--------

change in kinetic energy

change in momentum

change in work done

change in internal energy

View answer & explanation

Correct answer is B

It is a graph that represents the force that acts on a body in a certain amount of time.
Force on the object is represented by the y-axis and time taken by the object is represented by the y axis.
The area under the curve indicates the impulse, the change in momentum that the object undergoes.

90.

Which of the following scientist suggested that moving particles exhibit wave properties?

Isaac Newton

Ernest Rutherford

Louis de Broglie

J.J. Thompson

View answer & explanation

Correct answer is C

In 1924 Louis de Broglie introduced the idea that particles, such as electrons, could be described not only as particles but also as waves