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ECAT Pre General Science Mathematics Chapter 24 Vectors Online Test MCQs With Answers
Question # 1
The magnitude of a vector can never be
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Zero
Negative
Positive
None of these
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Question # 2
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direction ratios
direction cosines
direction angles
none of these
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Question # 3
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l
2
+ m
2
+ n
2
= 0
l
2
- m
2
+ n
2
= 1
l
2
+ m
2
+ n
2
= 1
l
2
+ m
2
- n
2
= 0
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Question # 4
If θ be angle between u,v and u,v determine the sides of a triangle then the third side opposite to angle θ has length
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|u+v|
|u|+|v|
|u-v|
|u|-|v|
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Question # 5
The physical quantity which possesses both magnitude and direction is called a
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scalar
vector
constant
none of these
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Question # 6
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perpendicular vectors
parallel vectors
concurrent vectors
none of these
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Question # 7
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Question # 8
Which of the following us a scalar
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displacement
velocity
acceleration
density
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Question # 9
Which of the following is a vector.
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energy
force
work
power
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Question # 10
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none of these
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Question # 11
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none of these
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Question # 12
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 # 13
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Question # 14
If a,b,c are unit vectors then |a + b|2 +|a - b|2
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4
8ab
9cos
4(a,b)
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Question # 15
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Question # 16
If a2 = b2 then
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a = b
a+b= 1
|a+b| =0
None
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Question # 17
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12
6
8
none of these
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Question # 18
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25
16
5
0
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Question # 19
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none of these
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Question # 20
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none of these
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Question # 21
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Question # 22
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0
1
-1
None
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Question # 23
If |αi + (α+1)j +2k| =3 then value of α is
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1,2
-1,-2
1,-2
-1,2
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Question # 24
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 # 25
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Question # 26
A vector with magnitude one is called
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constant vector
unit vector
zero vector
null vector
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Question # 27
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Free vector
Null vector
Unit vector
None of these
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Question # 28
If the angle between two vectors with magnitude 6 and 2 is 60° when their scalar product is
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12
6
3
0
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Question # 29
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none of these
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Question # 30
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none of these
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Question # 31
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a
1
+ a
2
a
2
1
+ a
2
2
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