Upthrust

Q.

A wooden block is floating in a beaker having water. During the free fall of the beaker, the upthrust on the block will be ___.

1. equal to the weight of the block

2. more than the weight of the block

3. zero

4. less than the weight of the block

Q.

Can upthrust be greater than the weight of the body?

Q.

Why is it easier for you to boat in saltwater than in freshwater?

Q.

Question 2
You have a bag of cotton and an iron bar, each indicating a mass of 100 kg when measured on a weighing machine. In reality, one is heavier than other. Can you say which one is heavier and why?

Q. A wooden block is floating in water in a beaker. During the free fall of the beaker, the upthrust on the block will be ___.

1. equal to the weight of the block
2. more than the weight of the block
3. less than the weight of the block
4. zero

Q. Why it is easier to swim in sea water than in fresh water?

1. Sea water is more dense than fresh water.
2. Sea water has waves.
3. Sea water exerts less upthrust.
4. Fresh water is more dense than sea water.

Q. Two pieces of metal when immersed in a liquid have equal upthrust on them. Select the correct statement regarding the physical property of the metals given that both of them completely sink in the liquid.

1. Both pieces must have equal weights
2. Both pieces must have equal densitites
3. Both pieces must have equal volumes
4. Both are floating to the same depth