A. 30°

**B. 60°**

C. 90°

D. 120°

# Vectors And Equilibrium

## Maximum number of rectangular components are_____________?

A. 1

B. 2

**C. 3**

D. 4

## If A=B, which of the following is not correct ?

**A. A.B = A^ B^**

B. |A| = |B|

C. |A^| = |B^|

D. AB^ = BA^

## Three coplanar forces acting on a body keep it in equilibrium. They should therefore be_______________?

**A. Concurrent**

B. Non-concurrent

C. Parallel

D. Non-parallel

## I ^. (j^ x k^) is equal to______________?

**A. 1**

B. i^

C. j^

D. k^

## The resultant of two forces of equal magnitudes is also equal to the magnitude of the forces. The angle between the two forces is________________?

A. 30°

B. 60°

C. 90°

**D. 120°**

## The unit vector in the direction of vector A = 2 i^ -2j^ + k^ is_______________?

A. 2i^ – 2j^ + k^

B. (2i^ – 2j^ +k^)/9

**C. (2i^ – 2j^ +k^)/3**

D. (2i^ – 2j^ +k^)/5

## A central force is that which__________________?

A. Can produce torque

**B. Cannot produce torque**

C. Some time can produce torque some time cannot

D. Has no relation with torque

## Cosθi^ + Sinθj^ is a_________________?

A. Vector

B. Position Vector

C. Vector in the direction at angle θ with an x-axis

**D. The unit vector in the direction at angle θ with an x-axis**

## Unit vector n^ is along______________?

A. X-axis

**B. Normal on a surface**

C. Y-axis

D. Z-axis