Question # 1

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

Vector i =

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[1,0]

[0,1,0]

[0,0,1]

None of these

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

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4

1/2

3

4/3

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

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5

5i

-5

√5

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

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

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√7

√41

√19

√(2&7)

a ______quantity is one that possesses both magnitude and direction.

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Scalar

Vector

Segment

None of these

O (0,0)is called:

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Position vector

Free vector

Unite vector

Null vector

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

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0

1

-1

3

The modulus of 12-5i is:

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7

13

√7

119

Vector additon is:

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Commutative

Associative

Commutative and Associative

None of these

If a,b = 0 then

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a |b

a||b

a = b

None

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