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Q: When an object sinks, the up thrust of the fluid on the object is :
  • A. Greater than the weight of the object
  • B. Less than the weight of the object
  • C. Same as the weight of the object
  • D. Zero
Correct Answer: Option B - If the up thrust (buoyant force) is less than the weight of the object, then the object will sink. The density of the object is greater than the density of the fluid, the object will sink.
B. If the up thrust (buoyant force) is less than the weight of the object, then the object will sink. The density of the object is greater than the density of the fluid, the object will sink.

Explanations:

If the up thrust (buoyant force) is less than the weight of the object, then the object will sink. The density of the object is greater than the density of the fluid, the object will sink.