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ECAT Mathematics Online Test MCQs With Answers
Question # 1
30° = ______
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Question # 2
if a
1
=3, d=7 and a
n
=59 , then the number of terms in A.P is
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7
9
11
13
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Question # 3
If for the matrix A,A5 = 1,then A-1=
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A2
A3
A
None of above
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Question # 4
The set {-1,1} is closed under the binary operation of
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Addition
Multiplication
Subtraction
Division
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Question # 5
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1 / 2
1 / 3
1 / 4
None of these
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Question # 6
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An empty set
Universal set
A singleton set
None of these
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Question # 7
The distance of the point (a,b) from y-axis is
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a
b
a + b
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Question # 8
In R the number of identity elements w.r.t.'.' is
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One
Two
Three
Four
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Question # 9
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Question # 10
The period of 2 cos x is
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30π
7π
5π
2π
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Question # 11
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Question # 12
Period of sin x is
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Question # 13
How many signals can be given by 5 flags of different colours, using 3 flags at a time
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120
60
24
15
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Question # 14
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Question # 15
The sum of complex number (a,b) and (c,d) is
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Question # 16
The set of all positive even integers is
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Not a group
A group w.r.t. subtraction
A group w.r.t. division
A group w.r.t. multiplication
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Question # 17
For any two sets A and, A ⊆ B if
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x ∈ A ⇒ x ∈ B
x ∉ A ⇒ x ∉ B
x ∈ A ⇒ x ∉ B
None of these
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Question # 18
The unit vector along z-axis is
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none of these
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Question # 19
The matrix A is Hermitian when (A)' =
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A
-A
A
A'
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Question # 20
sec (-360°) = ______
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0
1
2
3
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Question # 21
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1/2
2
1/4
4
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Question # 22
Domain of 3 sin x is ______
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[-3, 3]
R
Positive real numbers
None of these
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Question # 23
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Question # 24
The sum of all 2 digit number is
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4750
3776
4895
4905
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Question # 25
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2 and 9
3 and 2
2/3 and 9
3/2 and 6
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Question # 26
If a statement S(n) is true for n = 1 and the truth of S(n) for n = k implies the truth of S(n) for = k + 1, then S(n) is true for all
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Real numbers n
Integers n
Positive integers n
None of these
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Question # 27
If nis positive integers, then 2
n
>2n+1, only when
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n≤ 3
n≥ 3
n≤ 2
n≤ 1
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Question # 28
The obtuse angle between lines = -2 and y = x +2 is
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120°
135°
150°
140°
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Question # 29
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Question # 30
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Question # 31
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Parallel to the plane
At right angles to the plane
Lies in the plane
Meet the plane obliquely
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