Question # 1

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

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

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√13

√7

1/√13

√29

If the sum of two unit vectors is a unit vector the the magnitude of their difference is

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√2

√3

1

None of these

If a = [1,4,3] and B= [2,-1,5] athen the mid point M of AB is:

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[1,1,1.5]

[2,2,1.5]

[1.5,1.5,4]

None of these

If aand bare two vectors then a+b =

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b + a

b - a

ab

a^ b

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

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3

√35

√17

√35

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

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0

1

-1

3

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 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

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

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5

5i

-5

√5

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ECAT Mathematics Chapter 23 Pre Engineering Online Test MCQs With Answers

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