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WAEC Physics Past Questions & Answers - Page 164

816.

Which of the following phenomena is the practical evidence for the existence of the continual motion of molecules?

Translational motion

rotational motion

brownian motion

oscillatory motion

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

817.

In an experiment using a converging lens to produce real images on a screen, the linear magnification m, is plotted against the image distance v, as illustrated in the diagram below. The distance OP represents the

focal length of the lens

thickness of the lens

radius of curvature of the lens

diameter of the lens

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

818.

Which of the following representations is correct for an atom X with 28 electrons and 30 neutrons?

$^{30}_{28} X$

$^{28}_{30} X$

$^{58}_{30} X$

$^{58}_{28} X$

View answer & explanation

Correct answer is D

$X^{A = p + n = 28 + 30 = 58}_{Z = P = E = 28}$

819.

A radioactive substance has a half-life of 3 days. If a mass of 1.55g of this substance is left after decaying for 15 days, determine the original value of the mass

49.6g

37.2g

24.8g

12.4g

View answer & explanation

Correct answer is A

$1 \to \frac{1}{2} \to \frac{1}{4} \to \frac{1}{8} \to \frac{1}{16} \to \frac{1}{32}$

$\frac{1}{32} = 1.55g$

1 = 1.55 x $\frac{32}{1} = 49.6g$

820.

Which of the following statements about X-rays is not correct? They

are electromagnetic waves

can be used to study crystal lattice

can destroy living cells

are produced from the nucleus of an atom

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

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