NCERT Class 11-Math's: Chapter –14 Mathematical Reasoning Part 13

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Question 24:

The negation of the statement

“Plants take in and give out ” is

(A) Plants do not take in and do not give out .

(B) Plants do not take in or do not give out .

(C) Plants take in and do not give out .

(D) Plants take in or do not give out .

Answer: (B)

Question 25:

The negation of the statement

“Rajesh or Rajni lived in Bangalore” is

(A) Rajesh did not live in Bangalore or Rajni lives in Bangalore.

(B) Rajesh lives in Bangalore and Rajni did not live in Bangalore.

(C) Rajesh did not live in Bangalore and Rajni did not live in Bangalore.

(D) Rajesh did not live in Bangalore or Rajni did not live in Bangalore.

Answer: (C)

Question 26:

The negation of the statement

is not a multiple of ” is

(A) is a multiple of .

(B) is a multiple of .

(C) is an odd number.

(D) is an even number.

Answer: (A)

Question 27:

The contrapositive of the statement

“If 7 is greater than 5, then 8 is greater than 6” is

(A) If 8 is greater than 6, then 7 is greater than 5.

(B) If 8 is not greater than 6, then 7 is greater than 5.

(C) If 8 is not greater than 6, then 7 is not greater than 5.

(D) If 8 is greater than 6, then 7 is not greater than 5.

Answer: (C)

Question 28:

The converse of the statement

“If , then ” is

(A) If , then

(B) If , then

(C) If , then

(D) If , then

Answer: (B)

Question 29:

The converse of the statement

“If sun is not shining, then sky is filled with clouds” is

(A) If sky is filled with clouds, then the sun is not shining.

(B) If sun is shining, then sky is filled with clouds.

(C) If sky is clear, then sun is shining.

(D) If sun is not shining, then sky is not filled with clouds.

Answer: (A)

Question 30:

The contrapositive of the statement

“If , then ”, is

(A) If , then .

(B) If , then .

(C) If , then .

(D) If , then .

Answer: (C)