MCQ practice · SSC Physics Board questions · Chapter 5: State of Matter and Pressure
If a force of 2N is applied perpendicularly on an area of 5 cm², how much pressure will be created?
Think it through first, then pick an option.
- a 0.4 Pa
- b 2.5 Pa
- c 10 Pa
- d 4000 Pa
Answer and explanation
Correct answer: d 4000 Pa
5 cm² = 5 × 10⁻⁴ m²; P = F/A = 2 ÷ (5 × 10⁻⁴) = 4000 Pa.
Why the other options are wrong
- a 0.4 Pa: The value 2 ÷ 5 = 0.4 comes from leaving the area in cm²; 1 cm² = 10⁻⁴ m², so the area is 5 × 10⁻⁴ m².
- b 2.5 Pa: The value 2.5 comes from dividing 5 by 2, the division turned upside down; pressure = force ÷ area.
- c 10 Pa: The value 10 comes from multiplying 2 × 5; pressure is force divided by area, not multiplied by it.
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