Question # 1

If m and n be two scalars, then (m+n) g =

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0

m+n

m▁a+n▁a

ma - m▁a

Vector additon is:

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Commutative

Associative

Commutative and Associative

None of these

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

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√21

√97

√39

None of these

The angle between the vectors u = [-3 , 5] and v = [6 , -2] is:

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π/2

-3π/2

π

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

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1

√3

√2

7

The angle between the vectors u =2i - i + k and v = -i + i is:

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3π/2

2π/3

5π/6

π/3

If u = xi + yj, then|u|

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x² + y²

(x² +y²)²

x²-y²

√(x²+y²)

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ECAT Mathematics Chapter 23 Pre Engineering Online Test MCQs With Answers

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