100 practice questions covering Materials Around Us, organised into 1 topics. 100 questions include a written explanation. Pick a topic below, or try the samples first.
Which of these is a lustrous material?
Correct answer: B - Freshly cut iron
A freshly cut piece of iron shines brightly, so it is lustrous. Chalk, wood and cardboard all have dull surfaces that do not reflect light in this way.
Why can a large amount of cooking gas be stored inside a small cylinder?
Correct answer: D - A gas can be squeezed into a much smaller space
Gases can be compressed, so a large volume of gas is pressed into a small steel cylinder. Gases do have mass, which is why a full cylinder is heavier than an empty one. The contents do not become a solid. The volume is reduced by squeezing, not lost.
Which of these is opaque?
Correct answer: B - A wooden door
A wooden door stops light completely, so nothing behind it can be seen. A clean glass window and clear water are transparent. Butter paper lets some light through with a blurred view, which makes it translucent.
Two coins are placed side by side. One shines and the other looks dull. Which property is being compared?
Correct answer: C - Appearance
Shine and dullness are noticed simply by looking, so appearance is the property being compared. Hardness would need a scratch test, solubility would need a glass of water, and floating would need a tub of water.
Which list names a solid, a liquid and a gas, in that order?
Correct answer: A - Chalk, kerosene, air
Chalk keeps its own shape, kerosene flows into the shape of its container, and air fills whatever space it is given, so this is a solid, a liquid and a gas in the right order. Each of the other choices puts at least one of the three in the wrong place.
A child puts a steel plate, a steel spoon and a steel glass into one group. Which basis has been used?
Correct answer: C - The material they are made of
All three are made of steel, so the shared material is the basis of the group. Their shapes are quite different, a flat plate against a deep glass. Being kept in one kitchen is true of many other things too. Their costs are not equal either.
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