Engineering Mechanics
A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act

Downward at its upper end
Towards the wall at its upper end
Away from the wall at its upper end
Upward at its upper end

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Engineering Mechanics
According to Newton's first law of motion,

None of these
Everybody continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force
To every action, there is always an equal and opposite reaction
The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts

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Engineering Mechanics
The resolved part of the resultant of two forces inclined at an angle 'θ' in a given direction is equal to

The sum of the forces multiplied by the sine of θ
The difference of the forces multiplied by the cosine of θ
The sum of the resolved parts of the forces in the given direction
The algebraic sum of the resolved parts of the forces in the given direction

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