1. What do you mean by a moment of force? Why do we prefer a longer spanner for tightening a large nut?
2. What is a liquid pressure? Describe an experiment to show that the pressure of a liquid on the bottom of its container increases with an increase in the depth of the liquid.
3. The moment of a force of 90 Newton, acting along a line at a perpendicular distance X from the the axis of rotation equals 18Nm. Find the value of X?
4. Give reasons for the following:
A. Why do we feel a pressure on our finger when we used to cover a hole in a vessel filled with water?
B. It is easier to cut with a sharp knife than a blunt one.
C. Building and dams are made broader at the base than at the top.
D. Trucks and buses generally have Double wheels at the back.
5. a man is used to live in Mountain, if he comes down to plains,then What will happen to him ?
6. Harsh first stand and then lies down on a Sandy beach. In which case will he sink deeper and why?
7. A force of of hundred Newton acts along a line at a perpendicular distance of 20 cm from the axis of rotation. Find the moment of this force SI unit?
8. A force of 200 Newton acts normally over an area of 15 cm². Find the pressure exerted on the surface?
9. Find the ratio of the pressure due to
A ) a force of 100 Newton acting over an area of 20 CM square and
B) a force of 50 Newton acting over an area of 50 cm square.
10. The hand pump is a device that has been traditionally used for lifting out underground water. It's working is based on the existence and magnitude of atmospheric pressure. The atmospheric pressure at a given place can support a column of Mercury of height 75 cm. It is also known that Mercury has a density which is roughly 14 times that of water. The height of water column that the atmospheric pressure at that place can support. Given that the underground water at that place is present at a depth of 15 metre below the ground, will a hand pump be able to pump out this underground water?
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