Class 11 Maths Mcqs

Q:

Write solution set of equation x²-3x+2=0 in roster form.

A) {1,3} B) {2,4}
C) {1,4} D) {1,2}
 
Answer & Explanation Answer: D) {1,2}

Explanation: x²-3x+2=0
=>x²-x-2x-2=0=>x(x-1)-2(x-1)=0
=>(x-1)(x-2)=0=>x=1,2
so, the solution set of equation x²-3x+2=0 in roster form is {1,2}.

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Q:

Which of the following is not a set of letters of word PRINCIPAL?

A) {P,R,I,N,C,A,L} B) {C,A,P,I,N,R,L}
C) {P,R,I,N,C,I,P,A,L} D) {L,N,I,P,C,A,R}
 
Answer & Explanation Answer: C) {P,R,I,N,C,I,P,A,L}

Explanation: A set has all unique elements. So the set which contain all the elements of word PRINCIPAL and no letter is repeated. Hence, {P,R,I,N,C,I,P,A,L} cannot be a set.

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Sub Category: Class 11 Maths Mcqs

77
Q:

Which of the following set is not possible?

A) Honest persons B) Prime numbers up to 100
C) Even numbers up to 100 D) Letters forming the word SCHOOL
 
Answer & Explanation Answer: A) Honest persons

Explanation: A set is a collection of well defined objects but honesty has no precise definition.
Prime number is a number which can be divisible only by 1 and itself.
Even number is a number which can be divisible by 2.
Set of letters forming the word SCHOOL {S,C,H,O,L}.

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