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Free download in PDF Class 12 Maths Chapter 1 Relations and Functions Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 11 Maths with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>
2
Let the functioin ‘f’ be defined by f (x) = 5x² + 2 ∀ x ∈ R, then ‘f’ is
A
onto function
B
one-one, onto function
C
one-one, into function
D
many-one into function
View Answer
Answer:many-one into function
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3
Let A = {1, 2}, how many binary operations can be defined on this set?
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4
The range of the function f(x) =
is
A
[-2, 2]
B
[0, 1]
C
[1, 3]
D
None of these
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5
A relation R in human being defined as, R = {{a, b) : a, b ∈ human beings : a loves A} is-
A
reflexive
B
symmetric and transitive
C
equivalence
D
None of these
View Answer
6
If A = (1, 2, 3}, B = {6, 7, 8} is a function such that f(x) = x + 5 then what type of a function is f?
A
Many-one onto
B
Constant function
C
one-one onto
D
into
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7
If the function f(x) = x³ + ex/2 and g (x) = fn(x), then the value of g'(1) is
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8
If A = [1, 2, 3}, B = {5, 6, 7} and f: A → B is a function such that f(x) = x + 4 then what type of function is f?
A
into
B
one-one onto
C
many-onto
D
constant function
View Answer
9
If a relation R on the set {1, 2, 3} be defined by R = {(1, 2)}, then R is
A
reflexive
B
transitive
C
symmetric
D
None of these
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10
Let A = {1, 2,3,…. n} and B = { a, b}. Then the number of surjections from A into B is
A
n P2
B
2n – 2
C
2n – 1
D
None of these
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11
Let f: R → R be the function defined by f(x) = x³ + 5. Then f-1 (x) is
A
(x + 5)1/3
B
(x -5)1/3
C
(5 – x)1/3
D
5 – x
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12
Consider the binary operation * on a defined by x * y = 1 + 12x + xy, ∀ x, y ∈ Q, then 2 * 3 equals
A
31
B
40
C
43
D
None of these
View Answer
13
If f(x1 ) = f (x2 ) ⇒ x1 = x2 ∀ x1 x2 ∈ A then the function f: A → B is
A
many one
B
one-one onto
C
onto
D
one-one
View Answer
14
What type of relation is ‘less than’ in the set of real numbers?
A
only symmetric
B
only transitive
C
only reflexive
D
equivalence
View Answer
15
A = {1, 2, 3} which of the following function f: A → A does not have an inverse function
A
{(1, 1), (2, 2), (3, 3)}
B
{(1, 2), (2, 1), (3, 1)}
C
{(1, 3), (3, 2), (2, 1)}
D
{(1, 2), (2, 3), (3, 1)
View Answer
Answer:{(1, 2), (2, 1), (3, 1)}
16
Let f: |2, ∞) → R be the function defined by f(x) – x² – 4x + 5, then the range of f is
A
R
B
[1, ∞)
C
[4, ∞)
D
[5, ∞)
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17
Let f: A → B and g : B → C be the bijective functions. Then (g o f)-1 is,
A
f-1 o g-1
B
f o g
C
g-1 o f-1
D
g o f
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18
Which one of the following relations on R is an equivalence relation?
A
aR1 b ⇔ |a| = |b|
B
aR2 b ⇔ a ≥ b
C
aR3 b ⇔ a divides b
D
aR4 b ⇔ a < b
View Answer
19
If A, B and C are three sets such that A ∩ B = A ∩ C and A ∪ B = A ∪ C. then
A
A = B
B
A = C
C
B = C
D
A ∩ B = d
View Answer
20
If an operation is defined by a* b = a² + b², then (1 * 2) * 6 is
A
12
B
28
C
61
D
None of these
View Answer
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