Q1 Give reasons:

(a) A camel can run in a desert easily as compared to horse.
(b) A army tank weighing more than a thousand tonne rests upon a continuous chain.
(c) A truck or a motorbus has much wider tyres.
(d) Cutting tools have sharper edges.
(e) Buildings have broad foundations
(f) Dams have broader walls at the bottom.
(g) A cork floats while a nail sinks in water
(h) A body loses its weight when dipped in water
Q2. Name the factor on which the density of the fluid depends.

 

Some of the answers:

 

1-

  • Camels have cushion like broad pad toes which decrease the pressure on sand in the deserts and help them to walk on it.
  • A truck or motorbus bus has broad tyres so that there is less pressure on the ground and the tyres do not sink due to the weight.
  • Cutting tools have sharper edge because due to this the force of our hand falls over a very small area of the object producing a large pressure and this large pressure cuts the object easily.
  • A body  appear to be less heavy when submerged in water than they are in air because the water exerts an upward force on the object.

2-

The density of the fluid depends on temperature, pressure, and composition.

  • 12
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