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PHYSICS. Equilibrium of Forces. 1. A uniform metre rule of mass 130g is pivoted at...

PHYSICS.
Equilibrium of Forces.
1. A uniform metre rule of mass 130g is pivoted at the 55cm mark. An object of mass 20g is used to balance the rule horizontally. Calculate the distance of the object from the pivot.
A. 12.5cm B. 32.5cm C. 45cm D. 50cm.

2. What is the S.I unit of moment?
A. N/m B. Kg/s C. Nm D. Ns.

3. The ---- of two forces is the single force which keeps in equilibrium all the forces acting together.
A. Equilibrant B. Equilibrium C. resultant D. Stable.

4. If a force P of 40N acts in the direction due East and another force Q of 30N acts in the direction due North, calculate the resultant of these two forces.
A. 2500N B. 50N C. 250N D. 25N.

5. Two forces, whose resultant is 100N, are perpendicular to each other. If one of them makes an angle of 60 degree with the resultant, calculate its magnitude. ( Sin 60 degree - 0.8660, cos 60 degree - 0.5000.)
A. 50N B. 173.2N C. 115.5N D. 86.6N.

6. Which of the following has the same unit as the moment of a force.
A. Force B. Momentum C. Work D. Impulse.

7. A uniform bar 15m long, is balanced on a pivot placed at its mid-point. A boy of mass 55kg sits on one arm of the bar at a point 5m away from the pivot. What mass can be placed 2m away from the other end of the bar to keep the bar horizontal.
A. 5kg B. 6.9kg C 50kg D. 55kg.

8. The term torque means
A. The moment of a couple. B. The resultant of several forces C. Two equal and opposite forces. D. Two coplanar forces at right angles to each other.

9. A piece of wood is floating on water. The forces acting on the wood are
A. Upthrust and reaction. B. Weight and reaction. C. Weight and upthrust.
D. Upthrust and viscosity.

10. Which of the following is NOT a force?
A. Friction B. Tension C. Upthrust D. Impulse.?

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