CBSE Class 11 Mathematics Sets Worksheet Set 01

Case Based MCQs

A class teacher Mamta Sharma of class XI write three sets A, B and C are such that A = {1, 3, 5, 7, 9}, B = {2, 4, 6, 8} andC = {2, 3, 5, 7, 11}.

Answer the following questions which are based on above sets.

Question. Find A ∩ B.
(a) {3, 5, 7}
(b) Φ
(c) {1, 5, 7}
(d) {2, 5, 7}
Answer : B

Question. Find A ∩C.
(a) {3, 5, 7}
(b) Φ
(c) {1, 5, 7}
(d) {3, 4, 7}
Answer : A

Question. Which of the following is correct for two sets A and B to be disjoint?
(a) A∩B = Φ
(b) A∩B ≠ Φ
(c) A∪B = Φ
(d) A∪B ≠ Φ
Answer : A

Question. Which of the following is correct for two sets A and C to be intersecting?
(a) A∩C = Φ
(b) A∩C ≠ Φ
(c) A∪C = Φ
(d) A∪C ≠ Φ
Answer : B

Question. Write the n [P (B )].
(a) 8
(b) 4
(c) 16
(d) 12
Answer : C

In a company, 100 employees offered to do a work. In out of them, 10 employees offered ground floor only, 15 employees offered first floor only, 10 employees offered second floor only, 30 employees offered second floor and ground floor to work, 25 employees offered first and second floor, 15 employees offered ground and first floor, 60 employees offered second floor.

Based on the above information answer the following questions

Question. The number of employees who offered all three floors.
(a) 5
(b) 3
(c) 4
(d) 6
Answer : A

Question. The number of employees who offered ground floor.
(a) 50
(b) 60
(c) 65
(d) 70
Answer : A

Question. The number of employees who offered first floor.
(a) 40
(b) 45
(c) 50
(d) 55
Answer : C

Question. The number of employees who offered ground and first floor but not second floor.
(a) 10
(b) 15
(c) 20
(d) 25
Answer : A

Question. The number of employees who did not offer any of the above three floors.
(a) 15
(b) 10
(c) 5
(d) 0
Answer : C

Please click on below link to download CBSE Class 11 Mathematics Sets Worksheet Set A