Question 2 :
Fill in the blank.The pressure exerted on a surface by an object increases as the weight of the object _______ or the surface area of contact _______.
Question 3 :
_________ invented a pump to extract air out of the vessel.
Question 4 :
If the force on the surface is doubled and the area is reduced to half, pressure will:
Question 5 :
State whether the given statement is true or false :<br/>Gravity and friction are both contact forces. 
Question 6 :
Attraction and repulsion between charged objects are examples of _______ force.
Question 8 :
Smaller the area : larger the pressure : : larger the area :
Question 10 :
A nurse applies a force of 3.8 N to the syringe's piston of radius 0.9 cm. Find the increase in pressure of the fluid in the syringe?
Question 12 :
A vehicle sinks into soft ground. The vehicle is changed so that it does not sink as far. Which change is made?
Question 14 :
A drawing pin is pushed against a wooden table with a force of 10 N. Calculate the pressure exerted by the pin at a point on the table, if area of the point is 0.01 $cm^2$.
Question 16 :
Ink does not spill out of an ink dropper when the atmospheric pressure and ____ pressure are equal.
Question 19 :
State True or False :<br/>Magnetic force attracts all kinds of metals. 
Question 21 :
Fill in the blank.Keeping the surface area constant, if  the force is doubled, pressure _______.
Question 22 :
It is better to use a sharp tipped nail than a blunt nail because :
Question 23 :
Apparent loss of weight of a body when immersed in a liquid can be explained on the basis of
Question 24 :
Assertion: Hydrostatic pressure is not a vector quantity.
Reason: Pressure is force divided by area, and force is a vector quantity.
Question 25 :
Pressure exerted by a sharp needle on a surface is :
Question 26 :
What is a pressure on the smaller piston if both the pistons are at same horizontal level? (Take $g=10 ms^{-2})$<br>
Question 29 :
Animals like camels walk easily in desert as broad feet exert less pressure on sandy ground.
Question 33 :
When a plane moves along the runway, the air above the wing speeds up more,So the pressure<br>
Question 34 :
Pressure varies inversely with area (A) provided the thrust is same.
Question 36 :
What happens when pressure inside a sealed can is less than the atmospheric pressure?
Question 39 :
Pressure (P) exented by liquid on walls of the container when h = height of the liquid column, f = density, g is acceleration due to gravity
Question 40 :
Assertion: Pressure applied to an enclosed fluid is transmitted undiminished to every portion of the fluid and the walls of the containing vessel.
Reason: Fluids cannot distribute the external pressure equally to all portions.
Question 44 :
In a dam,where water has a height of $h$ then centre of pressure is
Question 45 :
Assertion: The pressure exerted by solids is a little different from that of fluids
Reason: There is loose interactions of atoms/ molecules in solids
Question 46 :
Assertion: The pressure at a point is the ratio of force to the area on which force is acting.
Reason: Pressure is the thrust acting per unit area.
Question 48 :
Fill in the blank.If the applied force is doubled, by keeping the surface area constant, the pressure____.
Question 49 :
State whether the following statements are true or false?<br/>(i) the pressure inside our body is equal to the atmospheric pressure<br/>(ii) pressure is inversely proportional to the area.
Question 50 :
Find the lifting force of a 4 kg cork lifebelt in sea water if the densities of cork and sea water are $ 0.2\times 10^3\,kg/m^3$ and $1.03\times 10^3\,kg/m^3$ respectively.
