Class 9 Physics · Chapter 6 · Test 2
Atmospheric and Hydraulic Pressure
37 MCQs
37 questions · 30 min · 37 marks
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Sample questions
The first 5 of 37. Try each one, then tap to see the answer.
Question 1
Atmospheric pressure is mainly caused by:
- AThe weight and motion of air molecules
- BThe rotation of Earth alone
- CThe magnetic field of Earth
- DThe colour of the atmosphere
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Answer: A
Air exerts pressure because of its weight and the collisions of its molecules.
Question 2
At sea level, the approximate atmospheric pressure is:
- A1.013 × 10³ Pa
- B1.013 × 10⁴ Pa
- C1.013 × 10⁵ Pa
- D1.013 × 10⁶ Pa
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Answer: C
The textbook gives standard sea-level atmospheric pressure as approximately 1.013 × 10⁵ Pa.
Question 3
Atmospheric pressure acts:
- AOnly downward
- BOnly upward
- COnly horizontally
- DIn all directions
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Answer: D
Atmospheric pressure acts in all directions.
Question 4
What generally happens to atmospheric pressure as altitude increases?
- AIt increases continuously
- BIt decreases
- CIt remains constant
- DIt becomes independent of air density
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Answer: B
Atmospheric pressure decreases with altitude as the air becomes less dense.
Question 5
According to the textbook, atmospheric pressure at an altitude of about 5 km is approximately:
- A101 kPa
- B55 kPa
- C10 kPa
- D1 kPa
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Answer: B
The textbook gives an approximate pressure of 55 kPa at 5 km altitude.
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