Physics
Assertion (A) : In heavy container trucks, more number of tyres are used to reduce the pressure on the ground.
Reason (R) : Larger the surface area, less is the pressure for the same thrust.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- Assertion is true but reason is false
- Assertion is false but reason is true
Force
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Answer
Both A and R are true and R is the correct explanation of A
Explanation
Assertion (A) is true because in heavy container trucks, more number of tyres increases the area of contact and thereby reduces the pressure on the ground and if there are only four tyres in a heavy truck, due to less area the pressure applied by the truck will be more and hence its speed will get affected.
Reason (R) is true because the pressure on a surface depends inversely on the area of the surface on which thrust acts so that smaller the surface area, more is the pressure exerted by the thrust and larger the surface area, lesser is the pressure exerted by the same thrust.
So, here reason justifies the assertion.
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Fill in the blanks:
(a) 1 kgf = …………… N (nearly).
(b) Moment of force = …………… x distance of force from the point of turning.
(c) In a door, handle is provided …………… from the hinges.
(d) The unit of thrust is …………… .
(e) Thrust is the …………… force acting on a surface.
(f) Pressure is the thrust acting on a surface of …………… area.
(g) The unit of pressure is …………… .
(h) Pressure is reduced if …………… increases.
(i) Pressure in a liquid …………… with the depth.
(j) The atmospheric pressure on earth surface is nearly …………… .