Engineering Mechanics
Non-coplanar concurrent forces are those forces which

Do not meet at one point and their lines of action do not lie on the same plane
Meet at one point, but their lines of action do not lie on the same plane
Do not meet at one point, but their lines of action lie on the same plane
Meet at one point and their lines of action also lie on the same plane

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Engineering Mechanics
One joule means that

Work is done by a force of 1 dyne when it displaces a body through 1 cm
Work is done by a force of 1 N when it displaces a body through 1 m
Work is done by a force of 1 kg when it displaces a body through 1 m
Work is done by a force of 1 g when it displaces a body through 1 cm

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Engineering Mechanics
Which of the following statement is correct in connection with projectiles?

The angle, with the horizontal, at which a projectile is projected, is known as angle of projection.
All of these
The velocity, with which a projectile is projected, is known as the velocity of projection.
A path, traced by a projectile in the space, is known as trajectory.

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