100 practice questions covering Materials Around Us, organised into 1 topics.
100 questions include a written explanation.
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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.
Q2
medium
Why can a large amount of cooking gas be stored inside a small cylinder?
AA gas loses its volume completely when it is stored
BA gas can be squeezed into a much smaller space
CA gas has no mass, so any amount of it fits anywhere
DA gas turns into a solid once it is inside the cylinder
Show answer and explanation
Correct answer: B - 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.
Q3
easy
Which of these is opaque?
AClear water in a glass
BA clean glass window
CA sheet of butter paper
DA wooden door
Show answer and explanation
Correct answer: D - 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.
Q4
medium
Two coins are placed side by side. One shines and the other looks dull. Which property is being compared?
AAppearance
BSolubility in water
CThe ability to float
DHardness
Show answer and explanation
Correct answer: A - 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.
Q5
medium
Which list names a solid, a liquid and a gas, in that order?
AAir, chalk, kerosene
BChalk, kerosene, air
CKerosene, chalk, air
DChalk, air, kerosene
Show answer and explanation
Correct answer: B - 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.
Q6
easy
A child puts a steel plate, a steel spoon and a steel glass into one group. Which basis has been used?
AThe shape they have
BThe place where they are kept
CThe cost of each item
DThe material they are made of
Show answer and explanation
Correct answer: D - 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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