Physics GK 10 - Floatation

1. Who was the first to state the principle of floatation?
[A] Isaac Newton
[B] Archimedes
[C] Aristotle
[D] Galileo Galilei

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2. What is the upward force experienced by a body, when it is immersed in a fluid, known as?
[A] Tangential force
[B] Buoyant force
[C] Centrifugal force
[D] Hydraulic force

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3. On which of these factors, the buoyancy depends?
[A] Density of the fluid
[B] Volume of the body
[C] Both a and b
[D] None of the above

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4. What happens to a body when its density is greater than the density of the fluid?
[A] it floats
[B] it sinks
[C] it stays at rest
[D] None of the above

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5. Which of the following is NOT an application of principle of floatation?
[A] Ships
[B] Balloons
[C] Submarines
[D] None of the above

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6. Which of the following represents the condition for floatation?
[A] Fb = mg
[B] Fb + mg =0
[C] Fb/ mg =1
[D] Fb = mgh

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7. What happens to a body when its density is equal to the density of the fluid?
[A] it floats
[B] it sinks
[C] it remains suspended
[D] None of the above

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8. What do we call the centre of gravity of the liquid displaced by a body?
[A] fluidic centre
[B] meta-centre
[C] centre of buoyancy
[D] None of the above

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9. Which of the following is equal to the upthrust of the body?
[A] mass of body
[B] weight of liquid
[C] weight of liquid displaced
[D] density of liquid

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10. What will be the buoyant force acting on the stone, on being immersed in water, if it displaces 100gms of water?
[A] 1000 gm-weight
[B] 100 gm-weight
[C] 10 gm-weight
[D] 1 gm-weight

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