Question # 1

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

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3

√35

√17

√35

If a,b = 0 then

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a |b

a||b

a = b

None

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

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 = 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 magnitude of vector a 2i-7j is

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√23

√43

3

√53

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

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1

√3

√2

7

The modulus of a vector i-i+ k is:

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√3

1

√2

∞

The positive real number which is the measure of the length of a vector is called the

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Unit vector

Modulus

Inverse

None of these

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ECAT Mathematics Chapter 23 Pre Engineering Online Test MCQs With Answers

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