9th Math Chapter 3 MCQs New Book
9th Math Chapter 3 MCQs New Book. Sets, relations and functions will be discussed.
Four options are given against each statement. Encircle the correct option.
(i) The set builder of the form
$$\{\;1,\;\frac13,\;\frac15,\;\frac17,…\}\;is:$$
$$(a)\;\{\;x\;\vert x\;=\frac1n,n\in W\;\}$$
$$(b)\;\{\;x\;\vert x\;=\frac1{2n+1},n\in W\;\}$$
$$(c)\;\{\;x\;\vert x\;=\frac1{n+1},n\in W\;\}$$
$$(d)\;\{\;x\;\vert x\;=2n+1,n\in W\;\}$$
Correct option is (b)
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(ii) If A = { }, then P(A) is:
(a) { }
(b) { 1 }
(c) { { } }
$$(d)\;\phi$$
Correct option is (c)
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(iii) If U = { 1, 2, 3, 4, 5 }, A = { 1, 2, 3 } and B = { 3, 4, 5 }, then
$$U-(\;A\cap B\;)\;is:$$
(a) {1,2,4,5}
(b) {2,3}
(c) {1,3,4,5}
(d) {1,2,3}
Correct option is (a)
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(iv) If A and B are overlapping sets, then n(A-B) is equal to
(a) n (A)
(b) n (B)
$$(c)\;A\cap B\;$$
$$(d)\;n(A)\;-\;n(A\cap B)$$
Correct option is (d)
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(v) If
$$A\;\subseteq B\;and\;B-A\;\neq\phi,\;then\;B-A\;is\;equal\;to$$
(a) 0
(b) n(B)
(c) n(A)
(d) n(B) – n(A)
Correct option is (d)
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(vi) If n(AUB) = 50, n(A) = 30 and n(B) = 35, then
$$n(A\cap B)\;=:$$
(a) 23
(b) 15
(c) 9
(d) 40
Correct option is (b)
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(vii) If A = { 1, 2, 3, 4 } and B = { x, y, z }, then cartesian product of A and B contains exactly _______ element.
(a) 13
(b) 12
(c) 10
(d) 6
Correct option is (b)
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(viii) If
$$f\mathit(x\mathit)\mathit\;\mathit=\mathit\;x^{\mathit2}\mathit-\mathit\;\mathit3x\mathit\;\mathit+\mathit\;\mathit2\mathit,\mathit\;then\mathit\;\\the\mathit\;value\mathit\;of\mathit\;\mathrm f(\;\mathrm a+1\;)\;\mathrm{is}\;\mathrm{equal}\;\mathrm{to}:$$
(a) a+1
$$(b)\;a^2+1\\(c)\;a^2+2a+1\\(d)\;a^2-a$$
Correct option is (d)
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(ix) Given that f(x) = 3x + 1, if f(x) = 28, then the value of x is:
(a) 9
(b) 27
(c) 3
(d) 18
Correct option is (a)
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(x) Let A = {1, 2, 3 } and B = {a, b } two non-empty sets and
$$f\;:\;A\rightarrow B$$
be a function defined as f = { (1,a).(2,b),(3,b) }, then which of the following statement is true ?
(a) f is injective
(b) f is surjective
(c) f is bijective
(d) f is into only
Correct option is (b)
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Check! Some important links below
9th Math new book exercise 3.1 notes
9th Math new book exercise 3.2 notes
Class 9th Math new book exercise 3.3 notes
You tube Channel 9th Math New Syllabus
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