Applied Mechanics and Graphic Statics
On a ladder resisting on a smooth ground and leaning against a rough vertical wall, the force of friction acts

Downwards at its upper end
Upwards at its upper end
Towards the wall at its upper end
Away from the wall at its upper end

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Applied Mechanics and Graphic Statics
If a set of given forces are such that their free vectors build a closed polygon, then

The resultant force is zero but resultant couple is not zero
The resultant force and resultant couple are always zero
The resultant force is zero but resultant couple may not be zero
The resultant force and resultant couple both may not be zero

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Applied Mechanics and Graphic Statics
One end of an elastic string of natural length ‘l’ and modulus ‘X’ is kept fixed while to the other end is attached a particle of mass m which is hanging freely under gravity. The particle is pulled down vertically through a distance ‘x’, held at rest and then released.The motion is

A rectilinear motion with constant speed
None of these
A simple harmonic motion
A damped oscillatory motion

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