# Vectors And Equilibrium Mcqs

Our collections of Multiple choice questions and answers focuses on study of Vectors And Equilibrium in Physics. These questions are chosen from a collection of most authoritative and best reference books on Physics. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, MDCAT, Teaching jobs Tests and Chemical industry job interviews. One should practice our Mcqs to assimilate knowledge on Vectors And Equilibrium in Physics comprehensively.

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7. Vectors And Equilibrium Mcqs

## 1. ? ? If A=Ax i^ + Ay j^ + Az K^ B = Bx i^ + By j^ + Bz K^ then

?? A. B = Ax Bx + Ay By + Az Bz

?? A. B = Ax By + Ay Bz + Az By

?? A. B = Ay Bz + Az By + Az Bx

?? A. B = Ax Bz + Ay By + Az Bx

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

2i^ - 2j^ + k^

(2i^ - 2j^ +k^)/9

(2i^ - 2j^ +k^)/3

(2i^ - 2j^ +k^)/5

## 3. A body in equilibrium

Always at rest

Always in uniform motion

May be at rest or in uniform motion

May be at rest or in motion

## 4. A body will be in complete equilibrium when it is satisfying

Ist condition of equilibrium

2nd condition of equilibrium

Both Ist and 2nd condition of equilibrium

Impossible

## 5. A central force is that which

Can produce torque

Can not produce torque

Some time can produce torque some time can not

Has no relation with torque

## 6. A vector can be multiplied by a number. The number may be

Dimensionless

Dimensional scalar

Negative

All a, b and c are correct

## 7. Addition of vector obeys

Commutative law

Distributive law

Associative law

All given laws in a , b and c

## 8. Angle between two vectors A and B can be determined by

Their dot product

Their cross product

Right hand rule

## 9. Cos?i^ + Sin?j^ is a

Vector

Position vector

Vector in the direction at angle ? with x-axis

Unit vector in the direction at angle ? with x-axis

A.B = A^ B^

|A| = |B|

|A^| = |B^|

AB^ = BA^

West

North

Down

Up

1st

2nd

Both 1st and 3rd

4th

First

Second

Third

Both 1st and 3rd

## 14. It is easier to turn a steering wheel with both hands than with a single hand because

Accelerating force increases on the wheel

Two forces act on the wheel

Two hands provide firm grip

Couple acts on the wheel

1

I^

J^

K^

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