Engineering Mechanics
Work done is said to be zero, when

None of these
Either (A) or (B)
Some force acts on a body, but displacement is zero
No force acts on a body but some displacement takes place

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Engineering Mechanics
For any system of coplanar forces, the condition of equilibrium is that the

Algebraic sum of the vertical components of all the forces should be zero
All of these
Algebraic sum of the horizontal components of all the forces should be zero
Algebraic sum of moments of all the forces about any point should be zero

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Engineering Mechanics
The total momentum of a system of masses (i. e. moving bodies) in any one direction remains constant, unless acted upon by an external force in that direction. This statement is called

Newton's first law of motion
Newton's second law of motion
Principle of conservation of energy
Principle of conservation of momentum

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