Everyday Science MCQs: Water Pressure and Buoyancy

What is specific gravity?

1. How heavy something is compared to the same amount of water.
2. How big something is.
3. How fast something sinks in water.
4. How much water an object can hold.

Right Answer: (A) How heavy something is compared to the same amount of water.

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What is the specific gravity of water?

1. 7.8
2. 10
3. 1
4. 0.5

Right Answer: (C) 1

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What is the specific gravity of iron?

1. 1
2. 2.5
3. 7.8
4. 11.36

Right Answer: (C) 7.8

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If you drop a piece of wood and a rock into the water, what will happen?

1. Both will sink.
2. Both will float.
3. The wood will float, and the rock will sink.
4. The rock will float, and the wood will sink.

Right Answer: (C) The wood will float, and the rock will sink.

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If an object is exactly as heavy as the water it moves, what will happen?

1. It will float on top of the water.
2. It will sink to the bottom.
3. It will stay in the middle of the water.
4. It will jump out of the water.

Right Answer: (C) It will stay in the middle of the water.

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Why do battleships carry less cargo than large passenger ships?

1. Battleships are smaller.
2. Battleships need more space for weapons.
3. Battleships are made of heavy steel, so they sink lower in the water.
4. Battleships use more fuel.

Right Answer: (C) Battleships are made of heavy steel, so they sink lower in the water.

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How does a submarine control whether it sinks or rises?

1. By using sails.
2. By controlling water in special tanks.
3. By adding extra weight.
4. By adjusting its size.

Right Answer: (B) By controlling water in special tanks.

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Why is it easier to float in seawater than in freshwater?

1. Sea water has more salt, making it denser.
2. Sea water has fewer minerals.
3. Sea water is lighter than fresh water.
4. Fresh water is more dense.

Right Answer: (A) Sea water has more salt, making it denser.

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What happens when oil is poured into water?

1. It mixes with the water.
2. It makes the water rougher.
3. It floats on the water.
4. It freezes the water.

Right Answer: (C) It floats on the water.

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What is the function of a hydrometer?

1. To measure temperature
2. To measure the weight of objects
3. To measure the specific gravity of liquids
4. To measure the color of liquids

Right Answer is: (C) To measure the specific gravity of liquids

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