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Question

Find the area of a body which experiences a pressure of 50,000 Pa by a thrust of 100 N.


Solution

F=100N
P = 50000 Pa
A=?
Area = ForcePressure      

        = 105000 

         = 0.002

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Physics | Concise Physics Standard VIII
Q2.

(a) S.I. unit of moment of force is :

(i) N     (ii) N cm    (iii) kgf m    (iv) N m 


(b) To obtain a given moment of force for turning a body, the force needed can be decreased by :

(i) applying the force at the pivoted point                                  (ii) applying the force very close to the pivoted point

(iii) applying the force farthest from the pivoted point.              (iv) none of the above.


(c) The unit of thrust is :

(i) kgf      (ii) kg      (iii) g        (iv) ms1


(d) The unit of pressure is :

(i) N×m       (ii) kgf           (iii) Nm2        (iv) kgf m2


(e) Thr pressure and thrust are related as :

(i) Pressure = Thrust          (ii) Pressure = Thrust × Area

(iii) Pressure = Thrust / Area              (iv) Pressure = Area / Thrust


(f) A body weighing 5 kgf, placed on a surface of area 0.1 m2, exerts a thrust on the surface equal to :


(g) The feet of lizards act like  :

(i) moving pads                (ii) drilling pads             (iii) suction pads                (iv) none of the above


(h) The pressure exerted by a liquid is due to its :

(i) weight          (ii) mass      (iii) volume         (iv) area


(i) The pressure inside a liquid increases with :

(i) increase in depth      (ii) decrease in depth      (iii) decrease in density        (iv) none of the above


(j) The atmospheric pressure at sea level is nearly:

(i) 10 Pa            (ii) 100,000 Pa           (iii) 100 Pa            (iv) 10,000 Pa


(k) Nose bleeding may occur at a high altitude because :

(i) the atmospheric pressure decreases         (ii) the  oxygen content of the atmosphere decreases

(iii) the atmospheric pressure increases        (iv) there are strong air currents at the high altitude

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