Q1. A ship floats on water according to:
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Answer: B. Archimedes' principle
By Archimedes' principle, the buoyant force equals the weight of water displaced, which balances the ship's weight.
Physics - Pressure Questions for SSC CGL (with Answers)
8 Physics - Pressure MCQs from the General Awareness section, with answers and short explanations.
Score: 0 / 0
Q2. The walls of a dam are made thicker at the bottom because:
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Answer: D. Water pressure increases with depth
Liquid pressure increases with depth, so the base must withstand greater pressure.
Q3. An object sinks in water if its density is:
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Answer: B. Greater than the density of water
If an object's density exceeds that of water, its weight exceeds the maximum buoyant force and it sinks.
Q4. Sharp knives cut easily because they:
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Answer: C. Exert more pressure due to a smaller area
A sharp edge has a tiny area, so the same force produces much greater pressure.
Q5. It is easier to swim in sea water than in river water because sea water:
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Answer: B. Has higher density and gives more buoyant force
Salty sea water is denser, so it provides greater upthrust.
Q6. A force of 100 N acts on an area of 0.5 m². The pressure is:
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Answer: B. 200 Pa
P = 100/0.5 = 200 Pa.
Q7. The hydraulic lift works on:
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Answer: A. Pascal's law
Hydraulic lifts use Pascal's law: pressure in an enclosed fluid is transmitted undiminished in all directions.
Q8. Standard atmospheric pressure at sea level is about:
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Answer: C. 1.01 × 10^5 Pa
1 atm ≈ 1.013 × 10^5 Pa, about 76 cm of mercury.
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