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Mathematics ECAT Pre Engineering Online Test MCQs With Answers
Question # 1
Roots of the equation x
2
+ 7x + 12 = 0 are
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{3, -4}
{-3, 4}
{3, 4}
{-3, -4}
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Question # 2
In R the number of identity element w.r.t '+' is
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One
Two
Three
Four
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Question # 3
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none of these
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Question # 4
2x = 3 is a conditional equation it is true for
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2
3
3/2
2/3
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Question # 5
The number of different ways of describing a set is
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One
Two
Three
Four
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Question # 6
The three consecutive numbers a,√ab,b are in
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G.P
H.P
G.M
None of these
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Question # 7
The middle term in the expansion of (a +x)
12
is
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7th
8th
9th
6th
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Question # 8
If A and B are skew-symmetric then (AB)t is
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At Bt
AB
-AB
BA
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Question # 9
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Scalar matrix
Identity matrix
Null matrix
Symmetric matrix
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Question # 10
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Question # 11
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Question # 12
(-28,12) divides the join of A(-6,3) and B(5,-2) in ratio
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1:2
3:2
2:3
2:1
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Question # 13
cos
θ/2=
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Question # 14
The multiplicative inverse of -3i is
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3i
-3i
-1/3i
1/3 i
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Question # 15
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Question # 16
A vector with magnitude one is called
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constant vector
unit vector
zero vector
null vector
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Question # 17
If a
1
, r are first term and the common ratio respectively then the sum of an infinite geometric series is
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Question # 18
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Question # 19
For any set B,B∪B' is
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Is set B
Set B'
Universal set
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Question # 20
Power set of X i.e P(X)..........under the binary operation of union U
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Forms a group
Does not form a group
Has no identity element
Infinite set although X is infinite
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Question # 21
i
2
=
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1
2
-1
0
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Question # 22
∫ x cos dx is equal to :
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x cos x + sin x
cos x + x sin x
x cos x + x sin x
x sin x + cos x
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Question # 23
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Question # 24
Only one of the root of ax2 + bx + c =0, a≠ 0 is zero if
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c = 0
c = 0,b≠ 0
b = 0,c = 0
b = 0,c≠ 0
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Question # 25
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12
13
14
15
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Question # 26
Sin h
-1
x = _________
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Question # 27
The set of the first elements of the orders pairs forming a relation is called its
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Relation in B
Range
Domain
Relation In A
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Question # 28
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Question # 29
Cos 60° = ______
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1
2
1/2
3
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Question # 30
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Question # 31
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1
-1
0
None of these
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