PressureCopy
1. What is the formula used to calculate pressure on a surface?
A. p = m × a
B. p = F × A
C. p = F ÷ A
D. p = A ÷ F
2. The SI unit of pressure is:
A. Newton
B. Joule
C. Pascal
D. Watt
3. 1 Pascal is equal to:
A. 1 N/m²
B. 1 N/cm²
C. 1 kg/m³
D. 1 J/m³
4. A force of 50 N is applied on an area of 2 m². What is the pressure?
A. 25 Pa
B. 100 Pa
C. 10 Pa
D. 0.04 Pa
5. If area is doubled and force remains the same, pressure will:
A. Double
B. Stay the same
C. Become half
D. Become zero
6. A drawing pin presses into a surface more easily than a coin. Why?
A. It has more mass
B. It has a smaller area
C. It has greater friction
D. It has less density
7. Why do camels have broad feet?
A. To increase friction
B. To reduce area
C. To increase pressure
D. To reduce pressure
8. Pressure at a surface produces force in which direction?
A. Horizontal
B. Diagonal
C. At right angles
D. In all directions
9. In a liquid, pressure acts:
A. Only downward
B. Only upward
C. Only sideways
D. In all directions
10. A sharp knife cuts better than a blunt one because:
A. It has more weight
B. It is made of iron
C. It has a smaller surface area
D. It has a larger surface area
Written and Compiled By Sir Hunain Zia, World Record Holder With 154 Total A Grades, 7 Distinctions and 11 World Records For Educate A Change O Level And IGCSE Physics Full Scale Course
11. A block of mass 10 kg is placed on a surface of area 0.5 m². What is the pressure exerted by the block? (g = 10 m/s²)
A. 100 Pa
B. 200 Pa
C. 50 Pa
D. 250 Pa
12. Pressure in liquids increases with:
A. Temperature only
B. Volume only
C. Depth and density
D. Height and area
13. The formula to calculate pressure difference in a fluid is:
A. ∆p = m × a
B. ∆p = ρgh
C. ∆p = F/A
D. ∆p = mg/h
14. What is the pressure 5 m below the surface of water? (ρ = 1000 kg/m³, g = 10 m/s²)
A. 50,000 Pa
B. 500 Pa
C. 5,000 Pa
D. 500,000 Pa
15. In the formula ∆p = ρg∆h, ∆h represents:
A. Depth
B. Force
C. Volume
D. Area
16. Which of the following affects the pressure at a point in a liquid?
A. Shape of container
B. Volume of liquid
C. Density and depth
D. Surface area
17. Why does a dam have thicker walls at the bottom?
A. To resist high temperature
B. To store more water
C. Because pressure increases with depth
D. Because water is heavier at the bottom
18. In a liquid barometer, atmospheric pressure is measured by:
A. Width of tube
B. Height of mercury column
C. Density of liquid
D. Mass of container
19. Mercury is used in barometers because:
A. It evaporates easily
B. It is less dense
C. It is transparent
D. It has high density
20. What happens to liquid pressure if depth doubles?
A. Becomes half
B. Doubles
C. Triples
D. Stays same
Written and Compiled By Sir Hunain Zia, World Record Holder With 154 Total A Grades, 7 Distinctions and 11 World Records For Educate A Change O Level And IGCSE Physics Full Scale Course
21. A hydraulic press has an input force of 200 N on a 0.01 m² area. What is the pressure transmitted?
A. 20,000 Pa
B. 2,000 Pa
C. 200 Pa
D. 2 Pa
22. If pressure in a fluid is 60,000 Pa, density is 1200 kg/m³, and g = 10 m/s², what is the depth?
A. 5 m
B. 50 m
C. 500 m
D. 0.5 m
23. What happens to pressure if both depth and density are doubled?
A. Remains the same
B. Doubles
C. Quadruples
D. Becomes half
24. Which instrument is used to measure atmospheric pressure?
A. Thermometer
B. Barometer
C. Hydrometer
D. Voltmeter
25. A syringe works on the principle of:
A. Gravity
B. Magnetism
C. Air resistance
D. Pressure transmission in liquids
26. A flat shoe exerts less pressure than a high heel shoe because:
A. Its force is less
B. It weighs more
C. It has more area
D. It has less density
27. The pressure beneath the surface of a liquid is directly proportional to:
A. Surface tension
B. Liquid colour
C. Depth
D. Container size
28. In the equation p = F/A, if A = 0.2 m² and p = 500 Pa, what is F?
A. 100 N
B. 250 N
C. 1000 N
D. 150 N
29. Which of the following does not affect pressure in a fluid at rest?
A. Shape of container
B. Depth
C. Density
D. Gravity
30. A vertical column of oil is 4 m high. If density = 800 kg/m³ and g = 10 m/s², what is the pressure at the bottom?
A. 320,000 Pa
B. 32,000 Pa
C. 3,200 Pa
D. 320 Pa
Written and Compiled By Sir Hunain Zia, World Record Holder With 154 Total A Grades, 7 Distinctions and 11 World Records For Educate A Change O Level And IGCSE Physics Full Scale Course
Answer key and explanations
1. Correct Answer: C
Explanation: Pressure is defined as force per unit area → p = F ÷ A
2. Correct Answer: C
Explanation: SI unit of pressure is Pascal (Pa)
3. Correct Answer: A
Explanation: 1 Pa = 1 N/m² by definition
4. Correct Answer: A
Explanation: p = F/A = 50 ÷ 2 = 25 Pa
5. Correct Answer: C
Explanation: Pressure ∝ 1/Area → If area doubles, pressure halves
6. Correct Answer: B
Explanation: Smaller area = higher pressure
7. Correct Answer: D
Explanation: Broader feet = less pressure → don’t sink in sand
8. Correct Answer: C
Explanation: Pressure acts perpendicular (at right angles) to the surface
9. Correct Answer: D
Explanation: Liquid pressure acts in all directions
10. Correct Answer: C
Explanation: Smaller surface area = more pressure = easier cutting
11. Correct Answer: B
Explanation: F = mg = 10×10 = 100 N, p = 100 ÷ 0.5 = 200 Pa
12. Correct Answer: C
Explanation: p = ρgh → depends on depth and density
13. Correct Answer: B
Explanation: ∆p = ρg∆h
14. Correct Answer: A
Explanation: p = ρgh = 1000 × 10 × 5 = 50,000 Pa
15. Correct Answer: A
Explanation: ∆h is the depth in the liquid
16. Correct Answer: C
Explanation: Only depth and density affect pressure, not shape or volume
17. Correct Answer: C
Explanation: Pressure increases with depth → need stronger structure
18. Correct Answer: B
Explanation: Atmospheric pressure = height of mercury column
19. Correct Answer: D
Explanation: Mercury has high density → shorter columns
20. Correct Answer: B
Explanation: Pressure ∝ depth → doubling depth doubles pressure
21. Correct Answer: A
Explanation: p = F/A = 200 ÷ 0.01 = 20,000 Pa
22. Correct Answer: B
Explanation: ∆p = ρgh → h = ∆p / (ρg) = 60000 / (1200×10) = 5 m
23. Correct Answer: C
Explanation: p = ρgh → doubling both ρ and h = 4 times pressure
24. Correct Answer: B
Explanation: Barometers measure atmospheric pressure
25. Correct Answer: D
Explanation: Based on pressure transmission in liquids (Pascal’s principle)
26. Correct Answer: C
Explanation: Flat shoe = more area = less pressure
27. Correct Answer: C
Explanation: Pressure beneath liquid = ρgh → directly proportional to depth
28. Correct Answer: B
Explanation: F = p × A = 500 × 0.2 = 100 N
29. Correct Answer: A
Explanation: Pressure doesn’t depend on shape of container
30. Correct Answer: B
Explanation: p = ρgh = 800 × 10 × 4 = 32,000 Pa