MCQ Questions

Question No. 1

Copy and complete Table 5.4, comparing the properties of solids, liquids and gases.

Answer :

Question No. 2

When potassium permanganate crystals are dropped into a beaker of water, the water slowly becomes coloured a reddish purple.

Answer :

a) What is the name given to the process by which the potassium permanganate molecules are distributed throughout the water?

b) What property of liquids does this process display?

c) Explain why solid potassium permanganate has a crystalline structure.

Question No. 3

Figure 5.21 shows the crystal structure of graphite. Identify, with reasons, the crystal structure type.

Answer :

Question No. 4

Crystalline sulphur exists as two allotropes.

Answer :

a) What are the crystalline structures of the two allotropes?

b) Explain how crystalline sulphur can be made into plastic sulphur.

c) Give one property of plastic sulphur which classifies it as an amorphous solid.

Question No. 5

In an oil drop experiment, the diameter of an oil drop molecule was found to be 2 × 10⁻⁶ mm. If the diameter of the oil drop used was 0.5 mm, calculate the diameter of the oil film formed when the oil drop was dropped on the surface of the water. (Hint: V = 4/3 πr³.)

Answer :

Question No. 6

What is a photon of light? What property of light can be explained using photons?

Answer :

Question No. 7

According to the particulate model of matter, diffusion can be explained in terms of:

Answer :

the existence of very strong forces between the particles

the existence of large spaces between the particles

the continuous motion of the particles

the orderly arrangement of the particles

Question No. 8

Which one of the following pieces of experimental evidence can be used to support the theory that there are empty spaces between liquid and gas particles?

Answer :

Brownian motion

Food colouring dissolving in water

A gas takes the shape and volume of its container

When two liquids are added to each other, the total volume is less than the volume of each liquid

Question No. 9

The motion of the particles in a solid is mainly:

Answer :

random motion at high speeds

vibratory motion in fixed positions

gliding motion

both random motion and vibratory motion

Question No. 10

The random motion of the bright spots in a smoke cell is that of:

Answer :

air particles pushed around by smoke particles

air particles pushed around by light rays

smoke particles pushed around by light rays

smoke particles pushed around by air particles

Question No. 11

When water boils, the water molecules:

Answer :

move more slowly

have smaller spaces between them

move further apart

attract each other with greater force

Question No. 12

The nucleus of an atom consists of:

Answer :

electrons, protons and neutrons

neutrons only

protons only

protons and neutrons

Question No. 13

Which one of the following is not a property of a crystalline solid? The solid:

Answer :

has a recognizable geometrical shape

has particles which are highly ordered in three-dimensional units forming lattices

has well-defined melting and boiling points

has large spaces between the particles

Question No. 14

Which one of the following solid substances is an amorphous solid?

Answer :

Epsom salts

plastic

potassium permanganate

gold

Question No. 15

A source of ultraviolet light is incident on a zinc plate placed on a neutral electroscope. The leaves of the electroscope:

Answer :

will not deflect because the light has no charge

diverge because the zinc became positively charged

diverge because the zinc became negatively charged

diverge because the ultraviolet light is negatively charged

Question No. 16

A photon is a bundle of:

Answer :

light energy which demonstrates the particle property of light

light energy which demonstrates the wave property of light

negative charge which demonstrates the particle property of light

light energy which demonstrates the particle property of matter

Chapter

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