Question # 1

Two forces each of 10 N act on a body, if the force are inclined at 30° and 60° respectively with x-axis, then x-component of their resultant is:

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20 N

13.66 N

10 N

8.66 N

The perpendicular distance from the axis of rotation to the line of action of force is called:

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Moment arm

Moment of a force

Torque

Non of these

All trigonometric functions (sine, cosine, tangent etc) are positive in:

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1st quadrant

2nd quadrant

3rd quadrant

4th quadrant

If x-component of a vector is -3 N and y-component is 3 N, then angle of resultant vector will x-axis is:

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45°

315°

135°

225°

If a vector lies in second quadrant, than B_xand B_yare:

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-,+

+,-

+,+

-,-

The magnitude of the resultant of two forces may be increased by:

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Increasing the angle between them

Decreasing the angle between them

Drawing a triangle to represent them

None of these

If two forces of magnitudes 3.5 and 2.5 N act on a body such that the angle between the forces is zero, then magnitude of the resultant will be:

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1.0 N

6 N

3.5 N

12 N

The magnitude of resultant of three vectors is 3. Its x-component is one, y-component is two, then its z-component is:

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0

1

2

3

When the magnitude of two component vectors are equal to that of their resultant, then the angle between the components is:

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60°

90°

120°

150°

The direction of a vector in space requires:

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X-axis

X and Y-axes

XYZ axes

Y and Z-axes

A vector which has magnitude 'one' is called:

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Resultant vector

A unit vector

Position vector

None of these

When a vector is multiplied by a negative number, its direction:

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Remains the same

Changes

Changes by 180°

None of these

Cosine of an angle is positive in:

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2nd quadrant

3rd quadrant

4th quadrant

All of these

The vector in space has:

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One component

Two components

Three components

None of these

Torque is also called:

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Momentum

Linear inertia

Moment of a force

Mass

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