Question

Topic - ' Force & Pressure '

Q1) Select the correct alternative :
i. The pressure and thrust are related as
a. Pressure = Thrust
b. Pressure = Thrust × Area
c. Pressure = Thrust/Area
d. Pressure = Area/Thrust

ii. A body weighing 5 kgf placed on a surface area on 0.1 metre square exerts a thrust on the surface :
a. 50 kgf
b. 5 kgf
c. 50 kgf metre square
d. 5 kgf metre square

iii. The feet of a lizard acts like :
a. Moving pads
b. Drilling pads
c. Suction pads
d. None of the above

iv. Pressure exerted by a liquid is due to its
a. Weight
b. Mass
c. Volume
d. Area

v. Pressure inside a liquid increases with
a. Increase in depth
b. Decrease in depth
c. Decrease in density
d. None of the above

Q2) Write an expression for moment of force about a given axis of rotation.


Q3) On what factor does the effect of Thrust on a surface depends?

Q4) Explain the following :
i. Sleepers are used below the rails.
ii. A tall building has wide foundations.

Q5) What do you mean by Atmospheric Pressure? Write the value 9f atmospheric pressure on the surface of Earth in Pascal.

Q6) A balloon collapses when air is removed from it. Give reason.​

Answer 1

Answer:

1) (c)

2) (b)

3) Trust is depend on how much area cover with certain pressure .