Distribution of Pressure

Q.

Equal amount of pressure is applied on two surfaces with different surface areas. For such a condition, which of the following statement is correct?

1. None of the above

2. Surface area with maximum value will experience maximum force

3. Surface area with minimum value will experience maximum force

4. All surface areas will experience same force.

Q.

Calculate the pressure in SI system, when a force of $100dynes$ acts on an area of $0.02c{m}^2$.

Q. There are 2 school bags A and B. Bag A is provided with a broader strap while bag B is provided with a thinner strap. For the same load, a school boy likes bag A as he is comfortable with it, but with bag B he develops a pain in his shoulders. This is because:

1. Both A and B.
2. Bag B has a thinner strap than A due to which the pressure felt is more for the same load.
3. Bag A has a broader strap than B due to which the pressure felt is less for the same load.
4. None of these.

Q.

Select the correct statement about winds.

1. High-speed winds reduce the air pressure in the region of wind flow.

2. High-speed winds increase the air pressure in the region of wind flow.

3. Wind increases the density of the air in the region of wind flow

4. None of these.

Q.

A sharp knife cuts better than a blunt knife. Which of the following options gives the correct reason for this?

1. A sharp knife is costlier than a blunt knife

2. Sharp knives are usually made of silver which has more strength

3. A sharp knife has smaller contact surface and hence applies more pressure

4. A sharp knife has more surface area and hence applies more pressure

Q.

A fly was sitting on a block. A man draws a circle of area ${2cm}^2$, thus enclosing the fly. He then applies a force of 20N and kills it with a flat stick. Calculate the pressure on that area.

1. Pa

2. Pa

3. Pa

4. Pa

Q.

A chef while cooking cuts his hand with a sharp-edged knife, but to his surprise, his hand did not cut with a spoon even on the application of a greater force. Why did it cut from a knife for a smaller force?

1. For the same force, the pressure developed in the knife is much larger due to its sharp edge than the spoon.

2. For the same force, the pressure developed in the knife is much smaller due to its sharp edge than the spoon.

3. Due to gravity.

4. Can't say.

Q. A 60 N force acts on a 3 metre square area, the pressure applied on the area is:

1. 10 Pa
2. 15 Pa
3. 20 Pa
4. 25 Pa

Q.

Anoop places a cuboid of dimensions $12cm\times 8cm\times 6cm$ with different faces touching a table. Which face, when touching the table, will experience the greatest pressure?

1. 

2. 

3. All faces experience the same pressure.

4. 

Q.

A sharp knife cuts better than a blunt knife. Which of the following options gives the correct reason for this?

1. A sharp knife has smaller contact surface and hence applies more pressure

2. A sharp knife is costlier than a blunt knife

3. A sharp knife has more surface area and hence applies more pressure

4. Sharp knives are usually made of silver which has more strength

Q. A thrust of $20N$ is acting on an area of $2m^2$. How much pressure is acting on the surface?