Force and Pressure Test

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Force and Pressure Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following options is/are TRUE?

A
Magnitude of buoyant force is maximum when the object is fully immersed in the liquid.

B
Magnitude of buoyant force increases as the density of the liquid decreases.

C
Magnitude of buoyant force is minimum when the object is fully immersed in the liquid.

D
Both (1) and (2)

Solution

Buoyant force is defined as the weight of the liquid displaced.
Buoyant force = Density of the liquid × Volume of the liquid displaced × Acceleration due to gravity
Hence, greater is the volume displaced, greater is the buoyant force. Volume displaced will be maximum when it is fully immersed. Greater is the density of the liquid, greater is the buoyant force.
Question 2
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Read the following statements and choose the correct option.

Statement A: Buoyant force on a fully immersed sphere will be more than that on a cube which is made of the same material and has the same mass as the sphere.

Statement B: Sphere will displace less volume as compared to the cube.

A
Both statements A and B are correct and B is the correct explanation of A.

B
Both statements A and B are correct, but B is not the correct explanation of A.

C
Statement A is incorrect, but statement B is correct.

D
Both statements A and B are incorrect.

Solution

Volume of the sphere will be less as compared to the cube hence it will displace less liquid in which it is immersed, so it will experience less buoyant force.
Question 3
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A solid piece of iron sinks in water but floats in mercury. This is because the

A
average density of water and mercury is less than that of iron

B
density of iron is more than that of water as well as mercury

C
density of iron is less than that of water as well as mercury

D
density of iron is more than that of water but less than that of mercury

Solution

The object will float in liquid if its density is less than the liquid in which it is immersed so density of iron is more than that of water but less than that of mercury.
Question 4
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A sphere made of iron is immersed in water. Another sphere of same dimensions but made of aluminium is immersed in alcohol. Choose the correct statement from the following.

A
Both spheres will experience the same buoyant force.

B
The aluminium sphere will experience more buoyant force than the iron sphere.

C
The iron sphere will experience more buoyant force than the aluminium sphere.

D
All the above statements are incorrect.

Solution

Buoyant force = Density of the liquid × Volume of the liquid displaced × Acceleration due to gravity

Greater is the density of the liquid, greater is the buoyant force. Water has more density as compared to alcohol and will exert more buoyant force as compared to the alcohol.
Question 5
1 / -0

When you press a rubber sucker against a surface, most of the air between its cup and the surface escapes out. To pull the rubber sucker off the surface, the applied force should be

A
equal to the atmospheric pressure

B
large enough to overcome the atmospheric pressure

C
less than the atmospheric pressure

D
None of the above

Solution

The rubber sucker sticks to the surface because the pressure of atmosphere acts on it. To pull the sucker off the surface, the applied force should be large enough to overcome the atmospheric pressure.
Question 6
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What happens when a stream of air is blown through a tube under one of the pans of a physical balance in equilibrium?

A
The pan will go up.

B
The pan will not be affected.

C
The pan will go down.

D
The pan will oscillate.

Solution

As the stream of air is blown through a tube under one of the pans, due to the high air speed, the pressure below the pan decreases as compared to the pressure above the pan. Hence, there will be a net downward force acting on the pan and the pan will go down.
Question 7
1 / -0

A deep sea diver may hurt his eardrum during diving because of

A
lack of oxygen

B
high atmospheric pressure

C
high water pressure

D
All of the above

Solution

When a diver dives into the deep sea, there is water on the outside of the ear drum, but air on the inside. The pressure inside will still be equal to atmospheric pressure. However, on the outside, the pressure will be greater. This means that the pressure of air inside the ear will not cancel the pressure of the water outside. There will be net inward force due to this pressure difference, as a result of which the eardrum will stretch. This stretching of the eardrum hurts.
Question 8
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Water is flowing through a pipe under constant pressure. At some place, the pipe becomes narrow. The pressure of water at this place

A
increases

B
decreases

C
remains the same

D
depends on several factors

Solution

As the area of cross section decreases velocity increases. At the narrow end as the area of cross section decreases, velocity increases.
As the velocity increases, pressure decreases.
Question 9
1 / -0

A raft is 2.35 m wide, 1.25 m long, and 0.365 m deep. What is the buoyant force on the raft, if only 0.125 m of the raft remains above water? (Take g = 10 m/s²)

A
10,500 N

B
3590 N

C
7050 N

D
6910 N

Solution

Upthrust acting on the object = Weight of the water displaced
Weight of the water displaced = Volume of water displaced (Volume of the object in the water) × Density × g
Volume of water displaced = 2.35 × 1.25 × 0.24 = 0.705 m³
Hence, upthrust = 0.705 × 10³× 10 = 7050 N

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Re-Attempt Weekly Quiz Competition

Force and Pressure Test - 2

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Force and Pressure Test - 2

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SHARING IS CARING

Question 1

Magnitude of buoyant force is maximum when the object is fully immersed in the liquid.

Magnitude of buoyant force increases as the density of the liquid decreases.

Magnitude of buoyant force is minimum when the object is fully immersed in the liquid.

Both (1) and (2)

Solution

Question 2

Both statements A and B are correct and B is the correct explanation of A.

Both statements A and B are correct, but B is not the correct explanation of A.

Statement A is incorrect, but statement B is correct.

Both statements A and B are incorrect.

Solution

Question 3

average density of water and mercury is less than that of iron

density of iron is more than that of water as well as mercury

density of iron is less than that of water as well as mercury

density of iron is more than that of water but less than that of mercury

Solution

Question 4

Both spheres will experience the same buoyant force.

The aluminium sphere will experience more buoyant force than the iron sphere.

The iron sphere will experience more buoyant force than the aluminium sphere.

All the above statements are incorrect.

Solution

Question 5

equal to the atmospheric pressure

large enough to overcome the atmospheric pressure

less than the atmospheric pressure

None of the above

Solution

Question 6

The pan will go up.

The pan will not be affected.

The pan will go down.

The pan will oscillate.

Solution

Question 7

lack of oxygen

high atmospheric pressure

high water pressure

All of the above

Solution

Question 8

increases

decreases

remains the same

depends on several factors

Solution

Question 9

10,500 N

3590 N

7050 N

6910 N

Solution

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