Question # 1

If u =[3,-4],then modulus of uis:

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5

5i

-5

√5

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

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

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√21

√97

√39

None of these

If c = 2i+j+k and d= -1 + 4j +2k, then [c-d]=

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√7

√41

√19

√(2&7)

If u = 2ai + i - k and v = i +ai + 4k are perpendicular then a =

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4

1/2

3

4/3

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 a≠ , b≠ 0 and|a=b|=|a-b|,then vectors a and b are:

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Parallel to each other

Perpendicular to each other

Inclined at 60^o

neither parallel nor perpendicular

Vector i =

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[1,0]

[0,1,0]

[0,0,1]

None of these

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

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4

6

5

3

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

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x -axis

y - axis

z- axis

None of these

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

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√13

√7

1/√13

√29

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ECAT Mathematics Chapter 23 Pre Engineering Online Test MCQs With Answers

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