3. Force and Pressure

1. Which of the following is the example of contact force?

1) gravitational force
2) Frictional force
3) electrostatic force
4) magnetic force

2. Match the pair
a) If several forces are applied on an object in the same direction ------1)a force equal to their difference acts on the object.

b) If two forces are applied on one object in directions opposite to each other ------- 2)Force is a vector quantity.

c) A force is expressed in magnitude and direction ------3)a force equal to their addition acts on that object.

1) a)-3, b) -1 , c)-2
2) a)-1 , b)-3, c)-2
3) a)-2 , b)- 3, c)-1
4) a)-1, b) -2 , c) -3

3. What happen if a force is applied on a object.
a) it moves
b) its speed change
c) its direction change
d) its shape change

1) only a is correct
2) a,b,c,d correct
3) only b and c is correct
4) only a, b ,c is correct

4. The tendency of an object to remain
in its existing state is called its-----------------

1) inertia.
2) speed
3) force
4) velocity

5. which is incorrect statement

1) Pressure is defined as force per unit area (on which the force is acting)
2) Pressure is defined as force per unit area (on which the force is acting)
3) Force = mass / acceleration
4) pressure = force/area

6. What is the SI unit of force?

1) Newton (N)
2) degree
3) power
4) watt

7. what is the SI unit of pressure ?

1) N/m
2) N
3) N/m2
4) m/N

8. When an object is partially or fully immersed in a fluid, a force of buoyancy ---------------------

1) acts on it in the all direction
2) acts on it in the downward direction
3) acts on it in the upward direction
4) not act on any direction

9. The area of the bottom of a box is 25 m2 and weight is 100 N, Calculate the pressure exerted by the box on the shelf.

1) 10 N/m2
2) 5 N/m2
3) 4 N/m2
4) 2500 N/m2

10. why water Bubble remains stable few second in atmosphere?

1) atmospheric pressure inside and outside is different
2) atmospheric pressure inside is more than outside
3) atmospheric pressure inside is less than outside
4) atmospheric pressure inside and outside is same

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