Online Test — Rocks & Soil
10 Questions • 12 min • Chapter MCQ
12:00
Question 1 of 10
hard
Why is soil important on top of the hard rock?
It is shiny
Plants can grow in soft soil
It is heavy
It blocks the Sun
Explanation: Plants need soft soil to take root and grow.
Question 2 of 10
easy
The dark, rich top layer of soil is called…
Bedrock
Topsoil
The sky
Sand sea
Explanation: Topsoil is the rich upper layer.
Question 3 of 10
easy
Mountains are made mostly of…
Water
Cotton
Rock
Air
Explanation: Mountains are huge masses of rock.
Question 4 of 10
easy
Soil is made when big rocks slowly break into…
Bigger rocks
Tiny pieces
Water
Air
Explanation: Rocks break into tiny pieces that form soil.
Question 5 of 10
medium
Humus makes soil…
Hard like rock
Rich and good for plants
Useless
Dry forever
Explanation: Humus makes soil rich and fertile.
Question 6 of 10
medium
Throwing plastic into soil is bad because plastic…
Does not rot and harms the soil
Feeds plants
Makes humus
Helps worms
Explanation: Plastic does not break down and pollutes soil.
Question 7 of 10
easy
Which rock is hard, shiny and used in fine buildings?
Chalk
Marble
Mud
Sand
Explanation: Marble is a hard, shiny building rock.
Question 8 of 10
hard
Why do farmers add manure to their fields?
To dry the soil
To make the soil richer for crops
To turn it to rock
To remove worms
Explanation: Manure adds nutrients, enriching the soil.
Question 9 of 10
easy
A soft white rock used to write on a board is…
Marble
Granite
Chalk
Iron
Explanation: Chalk is a soft rock we write with.
Question 10 of 10
medium
As we dig deeper, the soil usually becomes…
More rocky and less rich
Softer and richer
Wetter forever
Lighter in colour only
Explanation: Lower layers have more rock and less humus.