Class 6 practice
Class 6 science questions.
Science questions for Class 6, at the level of students aged 9–11, each with its answer and a short explanation. Try each one before opening the answer.
Kabir wants to recover pure salt from a clear saltwater solution. Which method should he use to separate the salt from the water?
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Answer: Evaporation
Salt completely dissolves in water to form a solution, so it cannot be filtered. Heating the solution evaporates the water, leaving salt crystals behind.
Deepa shakes a handful of garden soil in a tall jar of water and lets it settle. Which layer settles at the very bottom?
Level 4 of 5Show the answer
Answer: Gravel and coarse sand
Denser and heavier particles sink first. Coarse sand and gravel are the heaviest, so they form the bottom layer, while humus floats at the top.
On cool winter mornings in Delhi, grass blades are covered with tiny drops of water. Where did this water come from?
Level 4 of 5Show the answer
Answer: Water vapour in the air condensed on cool surfaces
At night, the ground and grass cool down rapidly. Warm air holding water vapour touches the cool grass, causing the vapour to condense into liquid dew drops.
Which essential vitamin is produced in human skin when it receives direct sunlight?
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Answer: Vitamin D
Human skin synthesises Vitamin D using energy from sunlight. Vitamin D helps the body absorb calcium to build strong bones and teeth.
Deepa leaves a bowl of wet salt out in the sun. After two days, only dry salt crystals remain. Which process caused the liquid water to disappear?
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Answer: Evaporation
Evaporation is the process where liquid water turns into water vapour due to heat. The sun heated the water, leaving dry salt behind.
During an experiment, Meera blew exhaled air through freshly prepared limewater using a straw. What caused the limewater to turn milky?
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Answer: Carbon dioxide
Carbon dioxide in exhaled breath reacts with limewater (calcium hydroxide) to form insoluble calcium carbonate, making the liquid turn milky white.
Farhan needs to separate fine iron powder thoroughly mixed with powdered sulfur. Which simple method should he use?
Level 4 of 5Show the answer
Answer: Using a bar magnet
Iron is a magnetic metal, while sulfur is non-magnetic. Moving a magnet over the mixture attracts and removes all the iron particles cleanly.
Priya stirs salt into a glass of water until no more salt can dissolve. What kind of solution has Priya made?
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Answer: A saturated solution
A solution is saturated when it contains the maximum amount of solute that can dissolve at that temperature. Any extra salt added will settle at the bottom.
Desert plants like the cactus have sharp spines instead of broad green leaves. What main purpose do these spines serve?
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Answer: They reduce water loss
Spines have a very small surface area compared to flat leaves. This prevents water loss through transpiration in hot, dry environments.
- True or false?
Rusting of iron is an example of a reversible physical change.
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Answer: False
Rusting produces a new chemical substance called iron oxide. It is an irreversible chemical change because the original iron cannot be easily recovered.
- True or false?
Plants release carbon dioxide during respiration, just like animals do.
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Answer: True
Plants carry out respiration all day and night to produce energy. During respiration, they consume oxygen and release carbon dioxide.
- Fill in the blank.
The spinning movement of the Earth on its own tilted axis is called ___ (starts with 'r').
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Answer: rotation
Rotation is the continuous spinning of the Earth on its imaginary axis, which causes the cycle of day and night.
- Fill in the blank.
The thick blood vessels that carry oxygen-rich blood away from the heart are called ___ (starts with 'a').
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Answer: arteries
Arteries carry oxygenated blood away from the heart to various body tissues, whereas veins return deoxygenated blood to the heart.
Which of these minerals or rocks is the odd one out?
Level 4 of 5Show the answer
Answer: Limestone
Limestone is a sedimentary rock formed from compressed shells and skeleton fragments. Basalt, granite, and pumice are all igneous rocks formed from cooling lava or magma.
Which of these joints in the human body is the odd one out?
Level 4 of 5Show the answer
Answer: Skull suture
Skull sutures are fixed or immovable joints. The shoulder, hip, and elbow are all movable synovial joints.
At night, a cool breeze blows from the land towards the sea. What heat transfer process mainly drives this movement?
Level 5 of 5Show the answer
Answer: Convection
At night, land cools faster than the sea. The warmer air over the water rises and cooler air from the land flows in, creating a convection current.
Mangrove trees grow in salty, waterlogged coastal soil. Which special feature helps their roots take in air?
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Answer: Pneumatophores growing upward
Waterlogged soil lacks oxygen. Mangroves have specialised breathing roots called pneumatophores that grow upward out of the mud and water to absorb oxygen from the air.
Rohan stirs sugar into water until no more dissolves at room temperature. What happens when he gently warms this mixture?
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Answer: More sugar can now dissolve.
Heating increases the solubility of sugar in water. When a saturated solution is warmed, it can dissolve additional solute.
- True or false?
Most plant seeds require direct sunlight to begin the process of germination.
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Answer: False
Seeds germinate underground where there is no light. They only need water, air, and proper warmth to sprout.
- Fill in the blank.
In salt water, salt acts as the ___ (substance that dissolves in a liquid).
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Answer: solute
A solute dissolves in a solvent to form a solution. Here, salt is the solute and water is the solvent.
These questions come from Ado’s question bank and are written with AI help. They are never used in ranked play, so practising them here can’t change anyone’s rank.
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