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1.

A force P of 50 N and another force Q of unknown magnitude act at 90° to each other. They are balanced by a force of 130 N. The magnitude of Q is                        
A. 60 N B. 80 N
C. 100 N D. 120 N



2.

If the resultant of two forces has the same magnitude as either of the force, then the angle between the two forces is                        
A. 30° B. 45°
C. 60° D. 120°



3.

A rod AB carries three loads of 30 N, 70 N and 100 N at distances of 20 mm, 90 mm and 150 mm respectively from A.Neglecting the weight of the rod, the point at which the rod will balance is                        
A. 109.5 mm from A B. 119.5 mm from A
C. 125.5 mm from A D. 132.5 mm from A




4.

The angles between two forces to make their resultant a minimum and a maximum respectively are                        
A. 0° and 90° B. 180° and 90°
C. 90° and 180° D. 180° and 0°



5.

When two forces, each equal to P, act at 90° to each other, then the resultant will be                        
A. P B. PV2
C. P/V2 D. 2P



6.

The resultant of two forces P and Q is R. If Q is doubled, the new resultant is perpendicular to P. Then,                        
A. P = R B. Q = R
C. P = Q D. None of the above is correct



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