# NCERT Class 12/MCQ Questions for Class 12 Maths Chapter 1 Relations and Functions Sample Test,Sample questions

## Question: `A = {1, 2, 3} which of the following function f: A â†’ A does not have an inverse function`

1.{(1, 1), (2, 2), (3, 3)}

2.{(1, 2), (2, 1), (3, 1)}

3. {(1, 3), (3, 2), (2, 1)}

4.{(1, 2), (2, 3), (3, 1)

Posted Date:-2021-12-15 12:15:22

## Question: `A relation R in human being defined as, R = {{a, b) : a, b âˆˆ human beings : a loves A} is-`

1.reflexive

2.symmetric and transitive

3.equivalence

4.None of the above

Posted Date:-2021-12-15 12:05:40

## Question: `Consider the binary operation * on a defined by x * y = 1 + 12x + xy, âˆ€ x, y âˆˆ Q, then 2 * 3 equals`

1.31

2.40

3.43

4.None of the above

Posted Date:-2021-12-15 11:52:45

## Question: `Consider the non-empty set consisting of children is a family and a relation R defined as aRb If a is brother of b. Then R is`

1.symmetric but not transitive

2.transitive but not symmetric

3.neither symmetric nor transitive

4.both symmetric and transitive

Posted Date:-2021-12-15 12:16:55

## Question: `f(x) = log2(x+3)x2+3x+2 is the domain of`

1.R â€“ {-1, -2}

2.(- 2, âˆž) .

3.R- {- 1,-2, -3}

4.(-3, + âˆž) â€“ {-1, -2}

Posted Date:-2021-12-15 12:09:24

## Question: `f: A â†’ B will be an into function if`

1.range (f) âŠ‚ B

2.f(a) = B

3.B âŠ‚ f(a)

4.f(b) âŠ‚ A

Posted Date:-2021-12-15 12:12:36

## Question: `For real numbers x and y, we write xRy â‡” x â€“ y + âˆš2 is an irrational number. Then, the relational R is`

1.Reflexive

2.Symmetric

3.Transitive

4.None of the above

Posted Date:-2021-12-15 12:42:31

## Question: `he period of sinÂ² Î¸ is`

1.Ï€Â²

2.Ï€

3.2Ï€

4.Ï€2

Posted Date:-2021-12-15 12:07:19

## Question: ```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? ```

1.Many-one onto

2.Constant function

3.one-one onto

4.into

Posted Date:-2021-12-15 12:01:25

## Question: `If A = [1, 2, 3}, B = {5, 6, 7} and f: A â†’ B is a function such that f(x) = x + 4 then what type of function is f?`

1.into

2.one-one onto

3.many-onto

4.constant function

Posted Date:-2021-12-15 12:11:19

## Question: `If a relation R on the set {1, 2, 3} be defined by R = {(1, 2)}, then R is`

1.reflexive

2.transitive

3.symmetric

4.None of the above

Posted Date:-2021-12-15 12:18:08

## Question: `If A, B and C are three sets such that A âˆ© B = A âˆ© C and A âˆª B = A âˆª C. then`

1.A = B

2.A = C

3.B = C

Posted Date:-2021-12-15 11:57:58

## Question: `If an operation is defined by a* b = aÂ² + bÂ², then (1 * 2) * 6 is`

1.12

2.28

3.61

4.None of the above

Posted Date:-2021-12-15 11:48:39

## Question: `If f : R â†’ R such that f(x) = 3x then what type of a function is f?`

1.one-one onto

2. many one onto

3.one-one into

4.many-one into

Posted Date:-2021-12-15 12:13:38

## Question: `If F : R â†’ R such that f(x) = 5x + 4 then which of the following is equal to f-1(x).`

1.xâˆ’54

2.xâˆ’y5

3.xâˆ’45

4.x4 -5

Posted Date:-2021-12-15 11:48:01

## Question: `If f(x) + 2f (1 â€“ x) = xÂ² + 2 âˆ€ x âˆˆ R, then f(x) =`

1.xÂ² â€“ 2

2. 1

3.13 (x â€“ 2)Â²

4.None of the above

Posted Date:-2021-12-15 12:06:38

## Question: `If f(x1) = f (x2) â‡’ x1 = x2 âˆ€ x1 x2 âˆˆ A then the function f: A â†’ B is`

1.one-one

2.one-one onto

3.onto

4.many one

Posted Date:-2021-12-15 11:44:59

## Question: `If f: R â†’ R defined by f(x) = 2x + 3 then f-1(x) =`

1.2x â€“ 3

2.xâˆ’32

3.x+32

4.None of the these

Posted Date:-2021-12-15 11:55:27

## Question: `If f: R â†’ R such that f(x) = 3x â€“ 4 then which of the following is f-1(x)?`

1.13 (x + 4)

2.13 (x â€“ 4)

3.3x â€“ 4

4.undefined

Posted Date:-2021-12-15 12:14:32

## Question: `If the function f(x) = xÂ³ + ex/2 and g (x) = fn(x), then the value of g'(1) is`

1.1

2.2

3.3

4.4

Posted Date:-2021-12-15 12:09:47

## Question: `If the set A contains 5 elements and the set B contains 6 elements, then the number of one-one and onto mappings from A to B is`

1.720

2.120

3.0

4.None of the above

Posted Date:-2021-12-15 12:22:20

## Question: `Let A = {1, 2, 3} and consider the relation R = {(1, 1), (2, 2), (3, 3), (1, 2), (2, 3), (1, 3)}. Then R is`

1. reflexive but not symmetric

2.reflexive-but not transitive

3.symmetric and transitive

4.neither symmetric, nor transitive

Posted Date:-2021-12-15 12:21:03

## Question: `Let A = {1, 2}, how many binary operations can be defined on this set?`

1.8

2.10

3.16

4.20

Posted Date:-2021-12-15 11:58:32

## Question: `Let E = {1, 2, 3, 4} and F = {1, 2} Then, the number of onto functions from E to F is`

1.14

2.16

3.12

4.8

Posted Date:-2021-12-15 11:57:03

## Question: `Let f : R â†’ R be defined by f (x) = 1x âˆ€ x âˆˆ R. Then f is`

1.one-one

2.onto

3.bijective

4.f is not defined

Posted Date:-2021-12-15 12:23:29

## Question: `Let f : R â†’ R be given by f (,v) = tan x. Then f-1(1) is`

1.Ï€/4

2.{nÏ€ + Ï€/4 : n âˆˆ Z}

3.does not exist

4. None of these

Posted Date:-2021-12-15 12:38:25

## Question: `Let f: A â†’ B and g : B â†’ C be the bijective functions. Then (g o f)-1 is,`

1. f-1 o g-1

2. f o g

3. g-1 o f-1

4.g o f

Posted Date:-2021-12-15 12:27:22

## Question: `Let f: N â†’ R be the function defined by f(x) = 2xâˆ’12 and g: Q â†’ R be another function defined by g (x) = x + 2. Then (g 0 f) 32 is`

1.1

2.0

3.7/2

4.None of the above

Posted Date:-2021-12-15 12:31:19

## Question: `Let f: R â€“ {35} â†’ R be defined by f(x) = 3x+25xâˆ’3 then`

1.f-1(x) = f(x)

2. f-1(x) = -f(x)

3. (f o f)x = -x

4.f-1(x) = 119 f(x)

Posted Date:-2021-12-15 12:28:17

## Question: `Let f: R â†’ R be the function defined by f(x) = xÂ³ + 5. Then f-1 (x) is`

1. (x + 5)1/3

2. (x -5)1/3

3.(5 â€“ x)1/3

4. 5 â€“ x

Posted Date:-2021-12-15 12:26:34

## Question: ```Let f: [0, 1| â†’ [0, 1| be defined by ```

1. Constant

2. 1 + x

3.x

4.None of the above

Posted Date:-2021-12-15 12:29:24

## Question: `Let f: |2, âˆž) â†’ R be the function defined by f(x) â€“ xÂ² â€“ 4x + 5, then the range of f is`

1.R

2. [1, âˆž)

3.[4, âˆž)

4. [5, âˆž)

Posted Date:-2021-12-15 12:30:18

## Question: `Let function R â†’ R is defined as f(x) = 2xÂ³ â€“ 1, then â€˜fâ€™ is`

1.2xÂ³ + 1

2.(2x)Â³ + 1

3.(1 â€“ 2x)Â³

4.(1+x2)1/3

Posted Date:-2021-12-15 12:02:15

## Question: `Let P = {(x, y) | xÂ² + yÂ² = 1, x, y âˆˆ R]. Then, P is`

1.Reflexive

2.Symmetric

3.Transitive

4.Anti-symmetric

Posted Date:-2021-12-15 12:41:07

## Question: `Let R be a relation on the set N be defined by {(x, y) | x, y âˆˆ N, 2x + y = 41}. Then R is`

1.Reflexive

2.Symmetric

3.Transitive

4.None of the above

Posted Date:-2021-12-15 12:43:45

## Question: `Let R be a relation on the set N of natural numbers denoted by nRm â‡” n is a factor of m (i.e. n | m). Then, R is`

1. Reflexive and symmetric

2.Transitive and symmetric

3.Equivalence

4.Reflexive, transitive but not symmetric

Posted Date:-2021-12-15 12:45:35

## Question: `Let R be an equivalence relation on a finite set A having n elements. Then, the number of ordered pairs in R is`

1.Less than n

2.Greater than or equal to n

3.Less than or equal to n

4.None of the above

Posted Date:-2021-12-15 12:41:47

## Question: `Let T be the set of all triangles in the Euclidean plane, and let a relation R on T be defined as aRb if a congruent to b âˆ€ a, b âˆˆ T. Then R is`

1.eflexive but-not transitive

2.transitive but not symmetric

3.equivalence

4.None of the above

Posted Date:-2021-12-15 12:16:08

## Question: `Let the functioin â€˜fâ€™ be defined by f (x) = 5xÂ² + 2 âˆ€ x âˆˆ R, then â€˜fâ€™ is`

1.onto function

2.one-one, onto function

3.one-one, into function

4.many-one into function

Posted Date:-2021-12-15 12:04:49

## Question: `Let us define a relation R in R as aRb if a â‰¥ b. Then R is`

1.an equivalence relation

2.reflexive, transitive but not symmetric

3.neither transitive nor reflexive but symmetric

4.symmetric, transitive but not reflexive

Posted Date:-2021-12-15 12:20:19

## Question: `The domain of sin-1 (log (x/3)] is. .`

1.[1, 9]

2.[-1, 9]

3. [-9, 1]

4.[-9, -1]

Posted Date:-2021-12-15 12:08:11

## Question: `The function f(x) = log (xÂ² + x2+1âˆ’âˆ’âˆ’âˆ’âˆ’âˆš ) is`

1.even function

2.odd function

3.Both of the above

4.None of the above

Posted Date:-2021-12-15 11:56:18

## Question: ```The identity element for the binary operation * defined on Q ~ {0} as a * b = ab2 âˆ€ a, b âˆˆ Q ~ {0} is```

1.1

2.0

3.2

4.None of the above

Posted Date:-2021-12-15 12:21:35

## Question: `The maximum number of equivalence relations on the set A = {1, 2, 3} are`

1.1

2.2

3.3

4.5

Posted Date:-2021-12-15 12:17:21

## Question: `The range of the function f(x) = (xâˆ’1)(3âˆ’x)âˆ’âˆ’âˆ’âˆ’âˆ’âˆ’âˆ’âˆ’âˆ’âˆ’âˆ’âˆš is`

1.[1, 3]

2.[0, 1]

3.[-2, 2]

4.None of the these

Posted Date:-2021-12-15 11:54:17

## Question: `The relation R = {(1,1), (2, 2), (3, 3), (1, 2), (2, 3), (1, 3)} on set A = {1, 2, 3} is`

1.Reflexive but not symmetric

2.Reflexive but not transitive

3.Symmetric and transitive

4.Neither symmetric nor transitive

Posted Date:-2021-12-15 12:40:20

## Question: `The relation R = {(1,1), (2, 2), (3, 3), (1, 2), (2, 3), (1, 3)} on set A = {1, 2, 3} is`

1.Reflexive but not symmetric

2.Reflexive but not transitive

3.Symmetric and transitive

4.Neither symmetric nor transitive

Posted Date:-2021-12-15 12:40:33

## Question: `The relation R is defined on the set of natural numbers as {(a, b): a = 2b}. Then, R-1 is given by`

1.{(2, 1), (4, 2), (6, 3),â€¦.}

2.{(1, 2), (2, 4), (3, 6),â€¦.}

3.R-1 is not defined

4.None of the above

Posted Date:-2021-12-15 12:39:17

## Question: `The relation R is defined on the set of natural numbers as {(a, b): a = 2b}. Then, R-1 is given by`

1.{(2, 1), (4, 2), (6, 3),â€¦.}

2.{(1, 2), (2, 4), (3, 6),â€¦.}

3.R-1 is not defined

4.None of the above

Posted Date:-2021-12-15 12:39:27

## Question: `What type of a relation is R = {(1, 3), (4, 2), (2, 4), (2, 3), (3, 1)} on the set A â€“ {1, 2, 3, 4}`

1.Reflexive

2.Transitive

3.Symmetric

4.None of the above

Posted Date:-2021-12-15 11:47:22

## Question: `What type of relation is â€˜less thanâ€™ in the set of real numbers?`

1.only symmetric

2.only transitive

3.only reflexive

4.equivalence

Posted Date:-2021-12-15 12:10:31

## Question: `Which of the following functions from Z into Z are bijective?`

1.f(x) = xÂ³

2.f(x) = x + 2

3.f(x) = 2x + 1

4.f{x) = xÂ² + 1

Posted Date:-2021-12-15 12:24:51

## Question: `Which one of the following relations on R is an equivalence relation?`

1.aR1b â‡” |a| = |b|

2. aR2b â‡” a â‰¥ b

3.aR3b â‡” a divides b

4.aR4b â‡” a < b

Posted Date:-2021-12-15 12:44:42

## More MCQS

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