Pressure

Q.

What is the SI unit of pressure?

Q.

Why does the nose of some people start bleeding at higher altitude

Q.

what is the difference between n/m² and pascal(p)?and what is the SI unit of pressure?

Q.

Calculate the pressure when a force of 200 N is exerted on an area of :(a) $10m^2$ (b) $5m^2$

Q.

Define the term 'pressure' and state its unit.

Q.

A pressure of 10 kPa acts on an area of 0.3 $m^2$. The force acting on the area will be :
(a) 3000 N (b) 30 N (c) 3 N (d) 300 N

Q.

Explain why the tip of a sewing needle is sharp

Q.

How does pressure exerted by a liquid change with depth?

Q.

Why we do not feel atmospheric pressure?

Q. Define thrust ?

Q.

An airplane of mass $3\times {10}^{4}kg$ and a total wing area of $120m^2$ is in a level flight at the same height. The difference in pressure between the upper and lower surface of its wings in Kilo Pascal is: $\left(g=10m{s}^{-2}\right)$

1. $2.5$

2. $5.0$

3. $10.0$

4. $12.5$

Q.

what is the relationship between pressure and depth h in a liquid of density d

Q.

The SI unit of thrust is ___.

Q.

The elephant weighs 20, 000 N stands on one foot of area $1000c{m}^2$. How much pressure would it exert on the ground?

1. 2, 00, 000 pascal

2. 20000 pascal

3. 200 pascal

4. 2 pascal

Q. Calculate the pressure produced by a force of 800 N acting on an area of 2.0m².

Q.

What is the meaning of liquid pressure

Q.

A cube of side 0.2 m rest on the floor . Given that the cube has a mass of 50 kg. The pressure exerted by the cube on the floor is?

(Take $g=10N/kg$)

Q. When the force acting on a surface increases, the pressure on a given area.

1. increases
2. decreases
3. remains the same

Q.

A ball of dough is rolled into a flat chapatti. Name the force exerted to change the shape of the dough.

Q. Why does a balloon burst when we inflate it more than a certain extent?

1. Due to high atmospheric pressure.
2. Due to high pressure on the wall of balloons caused by air inside the balloon.
3. Due to pressure inside the balloon being lower than the atmospheric pressure.
4. Due to decrease in pressure inside the balloon by inflating.

Q.

When a force of 5 N acts on a surface, it produces a pressure of 500 Pa.The area of surface then must be :
(a) $10c{m}^2$ (b) $50c{m}^2$ (c) $100c{m}^2$ (d) $0.01c{m}^2$

Q.

Why are dams broader at the base and narrow at the top ?

1. It is economically feasible.

2. To support increase in water pressure at the depth

3. None of these

4. It looks constructionally beautiful.

Q.

A boy weighing 60 kgf stands on platform of dimensions $2.5\times 0.5cm$. What pressure in Pascal does he exert?

Q.

What is P_o + hdg in fluid pressure ? May l get the simpler operation on this formula?

Q.

Write any two effects of atmospheric pressure.

Q.

What is lateral pressure?

Q. A sharp knife can cut objects more easily compared to a blunt knife because a sharp knife applies more pressure on the object.

1. True
2. False

Q.

Will you be able to drink water in space using a straw? why/why don't?

Q.

Define pressure and how it is related to force and area and give it's SI unit also.

Q.

Calculate the pressure in pascal exerted by a force of 300 N acting normally on an area of $30c{m}^2$.