Force and Pressure Test

Result

Force and Pressure Test - 12

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Question 1
1 / -0

A wooden block is floating in water contained in a beaker. If the beaker is placed in a free falling elevator, during the free fall, the up thrust on the block will be

A
Equal to the weight of the block

B
Slightly more than the weight of the block

C
Slightly less than the weight of the block

D
Zero.

Solution

The wooden block is floating in water. During free fall, weight of block floating in water will be zero, hence no water will be displaced. So up thrust on the block will also be zero.
Question 2
1 / -0

Does a falling body accelerate? Why?

A
Yes, because the gravity is a force that causes it to move faster.

B
No, because the gravity is a force that causes it to move at constant speed.

C
Yes, because the air causes it to accelerate.

D
No, because air keeps it moving at constant speed.
Question 3
1 / -0

A sharp knife enable us to cut through things more easily as compare to the blunt knife because

A
The pressure exerted is lesser when the same force is used

B
The pressure exerted is greater when the same force is used

C
The sharp edge can pass through the material slowly

D
The sharp edge is not felt when cutting through the material.