14) Which one of the following knots is very easy to untie ?

Answer is:

Bowline knot

Explanation:

Bowline knot is very easy to untie.

Which one of the following knots is very easy to untie ?

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15) S.W.L means

Answer is:

Safe working load

Explanation:

SWL means Safe Working Load

16) Which one of the following groups of properties enables the manufacture of chain hooks from wrought iron ?

Answer is:

Malleability, ductility and toughness

17) What is NOT an example of a machine ?

Answer is:

Bridge

Explanation:

Bridge is not a machine, it is a structure.
A bridge is a structure built to span a physical obstacle, such as a body of water, valley, or road, without closing the way underneath. It is constructed for the purpose of providing passage over the obstacle, usually something that can be detrimental to cross otherwise.