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Quiz Set 3: Fluid Pressure Concepts

Quiz by Mr.MD Showket Hasan

Grade 8
Science
Thailand Core Curriculum

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20 questions
Show answers
  • Q1
    What is the SI unit of pressure?
    Joule (J)
    Newton (N)
    Pascal (Pa)
    Meter (m)
    30s
    SC8.FM.1
  • Q2
    A pin easily bursts a balloon because it concentrates force over a small area. What does this demonstrate?
    Low pressure due to large area
    High pressure due to small area
    Gravity
    Low force applied by the pin
    30s
    SC8.FM.1
  • Q3
    If a person applies a force of 50 N over an area of 0.5 m², what is the pressure exerted?
    50 Pa
    100 Pa
    25 Pa
    150 Pa
    30s
    SC8.FM.1
  • Q4
    How does fluid pressure change as you go deeper underwater?
    It decreases
    It remains constant
    It increases
    It disappears
    30s
    SC8.FM.1
  • Q5
    Which factor does NOT affect fluid pressure at a certain depth?
    Density of the fluid
    Depth of the fluid
    Gravity
    Shape of the container
    30s
    SC8.FM.1
  • Q6
    An underwater diver is at a depth where the pressure is 3000 Pa. If the density of seawater is 1000 kg/m³ and gravity is 9.8 m/s², what is the approximate depth?
    10 m
    20 m
    30 m
    25 m
    30s
    SC8.FM.1
  • Q7
    If you swim twice as deep in water, what happens to the pressure you experience?
    It stays the same
    It reduces slightly
    It halves
    It doubles
    30s
    SC8.FM.1
  • Q8
    Why do dam walls get thicker towards the base?
    To prevent animals from entering
    To hold the dam's weight
    To resist increased pressure at greater depths
    To support the water above
    30s
    SC8.FM.1
  • Q9
    A force of 200 N is applied over an area of 2 m². What is the pressure exerted?
    500 Pa
    400 Pa
    100 Pa
    200 Pa
    30s
    SC8.FM.1
  • Q10
    Why do deep-sea fish have strong bodies?
    To move easily at any depth
    To reduce weight underwater
    To swim faster
    To withstand the high water pressure
    30s
    SC8.FM.1
  • Q11
    What happens to atmospheric pressure as altitude increases?
    It decreases
    It increases
    It becomes zero
    It remains constant
    30s
    SC8.FM.1
  • Q12
    A diver is at a depth of 30 m underwater. If the density of water is 1000 kg/m³ and gravity is 9.8 m/s², what is the pressure at that depth?
    294 Pa
    9,800 Pa
    29,400 Pa
    3,000 Pa
    30s
    SC8.FM.1
  • Q13
    Why does a syringe's plunger push up when a hole is made at the bottom?
    Atmospheric pressure outside pushes the liquid up
    The syringe creates its own pressure
    Gravity pulls it up
    The liquid pressure inside pushes it up
    30s
    SC8.FM.1
  • Q14
    A swimmer at the surface of a lake experiences less pressure than a diver below. Why?
    Pressure increases with depth
    The swimmer displaces more water
    Pressure decreases as you go deeper
    The diver has more weight
    30s
    SC8.FM.1
  • Q15
    A 500 N force is exerted over an area of 0.5 m². What is the pressure?
    500 Pa
    1500 Pa
    1000 Pa
    250 Pa
    30s
    SC8.FM.1

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