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Mathematics ECAT Pre Engineering Chapter 24 Vectors Online Test MCQs With Answers
Question # 1
If uv= Projuv then
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Uandvare parallel
vis a unit vector
Uis a unit vector
Both b and c
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Question # 2
If the angle between two vectors with magnitude 2 and 15 is 30
°
then their scalar product is
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15
30
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Question # 3
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Question # 4
If a,b,c are three non-coplanar vector then [a +b,b +c,c +a] = _____
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[a.b.c]
2[a,b,c]
[abc]-2
2[abc]2
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Question # 5
The zero vector is regarded to be parallel to
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Every vector
Is some cases
Both a,b
None
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Question # 6
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1
0
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Question # 7
The magnitude of a vector can never be
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Zero
Negative
Positive
None of these
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Question # 8
Which of the following is a scalar.
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force
frequency
weight
acceleration
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Question # 9
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none of these
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Question # 10
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Question # 11
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Question # 12
For two vector a and b, a+b = _______
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a b
b+a
b-a
None
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Question # 13
If a,b c are sides of a triangle taken in order then a x b =
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b x c
b x a
cxa
Both a & b
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Question # 14
The direction cosines of y-axis are
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1, 0, 0
0, 1, 0
0, 0, 1
1, 1, 1
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Question # 15
If a force F = 2i + j +3k acts at point (1,-2,2) of a body then the moment of F about a pint lying on the line of action of the force is
Choose an answer
5
Equal to the moment of the force about origin
0
Cannot be found
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Question # 16
If C is the mid point of AB and P is any point outside AB, then
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Question # 17
The position vector of a point (x, y) in xy plane is
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none of these
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Question # 18
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Free vector
Null vector
Unit vector
None of these
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Question # 19
The unit vector along x-axis is
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none of these
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Question # 20
The zero vector is
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[0, 0, 0]
[1, 1, 1]
[0, 1, 0]
[0, 0, 1]
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Question # 21
3j . k x i
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0
1
3
9
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Question # 22
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Question # 23
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Question # 24
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[0, 0, 0]
[1, 0, 0]
[0, 1, 0]
[0, 0, 1]
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Question # 25
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Question # 26
If a +b +c =0 then which of the following is true
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a =b =c =0
a,b =b,c =c,a
a xb=b xc =c xa
None
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Question # 27
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direction ratios
direction cosines
direction angles
none of these
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Question # 28
The physical quantity which can be specified by a number alongwith unit is called a
Choose an answer
scalar
vector
constant
none of these
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Question # 29
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none of these
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Question # 30
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