Question # 1

If|a| =|b|=|a + b|=1, then|a+ b| = 5, then|a-b| =

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4

6

5

3

O (0,0)is called:

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Position vector

Free vector

Unite vector

Null vector

The vector k = [0,0,1] is called unit vector along:

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x -axis

y - axis

z- axis

None of these

If u =2i +pi + 5k and v = 3i + i +pk are perpendicular , then p=

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1

2

-1

-3

The modulus of 12-5i is:

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7

13

√7

119

If a=5j + 2j,b=2i -3j, then|a+2b|=

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√21

√97

√39

None of these

If G is the centroid of the triangle, then GA +GB+GC=

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0

1

-1

3

The positive real number which is the measure of the length of a vector is called the

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Unit vector

Modulus

Inverse

None of these

If|a| =|b| = |a+b|=1, then|a-b| is equal to:

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1

√3

√2

7

If aand bare two vectors then a+b =

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b + a

b - a

ab

a^ b

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ECAT Mathematics Chapter 23 Pre Engineering Online Test MCQs With Answers

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