Some things float and others sink due to differences in density between the object and the fluid it is placed in. If an object is less dense than the fluid, it will float; if it is more dense, it will sink.
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MCQs
1. Why does a heavy ship made of steel float on water?
A) Because it is painted
B) Because of its shape
C) Because it is very big
D) Because steel is lighter than water
Answer: B) Because of its shape
Explanation: The shape of the ship distributes its weight over a large area, allowing it to displace enough water to float, despite being made of heavy steel.
2. What is buoyancy?
A) The ability to sink
B) The force that makes things float
C) The color of water
D) A type of boat
Answer: B) The force that makes things float
Explanation: Buoyancy is the upward force exerted by a fluid (like water) that opposes the weight of an object immersed in it, making the object float.
3. Which of these will sink in water?
A) A balloon filled with air
B) A rubber duck
C) A rock
D) A piece of wood
Answer: C) A rock
Explanation: A rock will sink because it is denser than water, meaning it has more mass for its size compared to water.
4. What does it mean if something is denser than water?
A) It is softer than water
B) It will float on water
C) It will sink into the water
D) It can dissolve in water
Answer: C) It will sink into the water
Explanation: If something is denser than water, it means it has more mass for its size compared to water, causing it to sink.
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