A. 30Â°

B. 45Â°

C. 60Â°

**D. 120Â°**

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### Related Mcqs:

- A force P of 50 N and another force Q of unknown magnitude act at 90Â° 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** - 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 - The angles between two forces to make their resultant a minimum and a maximum respectively are__________________?
A. 0Â° and 90Â°

B. 180Â° and 90Â°

C. 90Â° and 180Â°

**D. 180Â° and 0Â°** - When two forces, each equal to P, act at 90Â° to each other, then the resultant will be_____________?
A. P

**B. PV2**

C. P/V2

D. 2P - The condition of equilibrium for any system of forces in a plane is____________________?
A. that polygon of forces must close

B. that resultant couple must be zero

**C. both (A) and (B)**

D. none of the above - If the given forces P,, P2, P3 and P4 are such that the force polygon does not close, then the system will___________________?
A. be in equilibrium

**B. always reduce to a resultant force**

C. always reduce to a couple

D. both (A) and (C) - The force polygon representing a set of forces in equilibrium is a_____________________?
A. triangle

B. open polygon

**C. closed polygon**

D. parallelogram - A ball moving on a smooth horizontal table hits a rough vertical wall, the coefficient of restitution between ball and wall being 1/3. The ball rebounds at the same angle. The fraction of its kinetic energy lost is___________________?
A. 1/3

B. 2/3

C. 1/9

**D. 8/9** - A ladder of weight â€˜wâ€™ rests against a smooth vertical wall, and rests on rough horizontal ground, the coefficient of friction between the ladder and the ground being 1/4. The maximum angle of inclination of the ladder to the vertical, if a man of weight â€˜wâ€™ is to walk to the top of it safely, is tanâ€™1 x, where x is___________________?
A. 1/4

**B. 1/3**

C. 3

D. 4 - If the direction of projection bisects the angle between the vertical and the inclined plane, then the range of projectile on the inclined plane is__________________?
A. zero

**B. maximum**

C. minimum

D. unpredictable

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