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DESHBANDHU VIDYLAYA GIRLS’ (CBSE), CLW /CHITTARANJAN, PERIODIC TEST-4 : 2021-2022, CLASS: XI, SUBJECT: MATHEMATICS (041), , Time Allowed: 45 minutes Maximum Marks: 20, , , , Each Question is of 1 mark weightage., , , , 1, , A set which does not contain any element is called, , , , , , , , , , , , , , , , , , , , , A) Empty set. B) Null set. C) Void set. D) All the above, 2 | Which of the following statement is false A) A-B=AnB’ B)-B=A-(ANB). C)A-B=A-8B' D)A-B=(AUB)-B, 3 | Let A and B be finite sets containing m and n elements respectively. The number of relations that can, be defined from A to B is —, rt ae B) mn, ar" D) None of these., 4 | The modulus of (1 + (3 + 4i) isA) V50 B) 10 c)5 D) None of these., | 5 | Find the wrong term in the sequence 35, 48, 99, 120, 195, 234., A) 99 B) 120 C) 234 D) 195., 6 | In numbers from 1 to 100 the digit ‘0’ appears --—---timesA)9 B) 10 c)11 D) 12., 7 | The sum of complex numbers (a + ib) and (c + id) is purely imaginary ifA) a+c=0 B)a+d=0 C)b+d=0 D)b+c=0., 8 | Ifaand b are the roots of the equation x* + x + 1 = 0, then the value (a* + b*) is A) 1 B) 0. C) -2. D) 2., 9 | If 7" and 13” term of an AP. be 34 and 64 respectively, then its 18” term is A) 87 B) 88 c) 89 D) 90, 10 | Three numbers are in A.P. and their sum is 21. Then the middie number is A) 5 B)7. c)6 D) None of these., 11 | Ifthe sum of n terms of an AP. is 3n” +5n, then its 27" term is A) 164 B) 154 C) 64 D) None of these., 12 | The two geometric means between the numbers 1 and 64 are A) . 1 and 64 B). 1and 32 C). 4 and 16 D) 2 and 16, 13 | 7" term of the GP. 3,6, 12, ...........is, , A) 831 B) 183 C) 381. D) None of these

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14 | Which of the following is not an empty set?, A) Set of all even natural numbers divisible by 5.. C) Set of all even prime numbers., B) {x: xis point common to any two paraliel lines} | _D) None of these., 15 | For any two non-empty sets A and B, if Ax B = Bx A. Then which of the following is incorrect A) ANB=A B)A=B C) AUB =B. D) None of these., 16 | if (=) = 1, then the least positive integral value of m is A) 2 B)3 co D) 4., 17 | The domain of the function f(x) = 1— |x — 3] is A) R- (1). B)R C) R- {3} D) None of these., 18 | The value of (1+ (1 + (7)(1+#)(1 + i) is A) 0 B)2 c)1 D)i, 19 | The value of i*” is A) 1. B) -i. Cji. D) -1., 20 | Solutions of the quadratic equation x’ + (1 — 2i)x — 21 = 0 are , , , A) 1,2i B) 1,—2i. C) -1,2i D) None of these.