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ECAT Mathematics Chapter 24 Vectors Online Test MCQs With Answers
Question # 1
Choose an answer
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 # 2
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direction ratios
direction cosines
direction angles
none of these
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Question # 3
3j . k x i
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0
1
3
9
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Question # 4
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 # 5
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Question # 6
Which of the following is a vector.
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work
time
density
electric field
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Question # 7
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none of these
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Question # 8
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12
6
8
none of these
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Question # 9
Unit vector in the positive direction of x-axis is
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Question # 10
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Question # 11
If a2 = b2 then
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a = b
a+b= 1
|a+b| =0
None
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Question # 12
Which of the following is a vector.
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energy
force
work
power
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Question # 13
Which of the following is a scalar.
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force
frequency
weight
acceleration
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Question # 14
A vector with magnitude one is called
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constant vector
unit vector
zero vector
null vector
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Question # 15
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Question # 16
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 # 17
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Question # 18
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none of these
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Question # 19
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Question # 20
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0
1
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Question # 21
The angle between the vectors 3i + j - k and 2i - j + k is
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Question # 22
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Question # 23
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0
1
-1
None
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Question # 24
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0
90°
180°
360°
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Question # 25
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Question # 26
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none of these
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Question # 27
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1
0
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Question # 28
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direction ratios
direction cosines
direction angles
none of these
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Question # 29
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 # 30
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Question # 31
The unit vector along y-axis is
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none of these
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