Question # 1

If a,b = 0 then

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a |b

a||b

a = b

None

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

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√21

√97

√39

None of these

If a = 2i +2j, b= 3i -j and c=4i +5j, the 3b -a-2c =

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-i -15j

i-15j

i-3j

None of these

I f a =5i + 2j, then|a| =

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√13

√7

1/√13

√29

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

Vector i =

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[1,0]

[0,1,0]

[0,0,1]

None of these

If aand bare two vectors then a+b =

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b + a

b - a

ab

a^ b

If the angle between two vectors u and v is 0 orπ, then the vectors u and v are:

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Orthogonal

Collinear

Perpendicular

None of these

The magnitude of vector a=i-3j+5k is:

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3

√35

√17

√35

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

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x-axis

y - axis

z- axis

Botha a and y-axis

If the angle between two vectors u and v is 0 orπ, then the vectors u and v are:

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Orthogonal

Collinear

Perpendicular

None of these

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

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ECAT Mathematics Chapter 23 Pre Engineering Online Test MCQs With Answers

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