Mathematics Class 10th Chapter-1 [Real Number] Important 50 MCQ Question Answer

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Question 1: The LCM of 72 and 120 is:
A) 360
B) 720
C) 840
D) 180
Explanation: LCM of 72 and 120 is 360.
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Question 2: The HCF of 306 and 657 is:
A) 9
B) 17
C) 27
D) 51
Explanation: Option A) 9 is correct answer.
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Question 3: Which of the following is an irrational number?
A) 0.333…
B) 2.121212…
C) √2
D) 3/7
Explanation: Option C) √2 is correct answer.
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Question 4: If HCF of two numbers is 16 and their product is 3072, then their LCM is:
A) 156
B) 192
C) 256
D) 312
Explanation: Option B) 192 is correct answer.
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Question 5: HCF of 8, 9 and 25 is:
A) 1
B) 2
C) 3
D) None
Explanation: Option A) 1 is correct answer..
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Question 6: The HCF of 60 and 150 is:
A) 15
B) 30
C) 60
D) 120
Explanation: Option B) 30 is correct answer..
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Question 7: If HCF(65, 117) = 13, then LCM(65, 117) = ?
A) 455
B) 585
C) 5855
D) 715
Explanation: Option B) 585 is correct answer..
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Question 8: The smallest number divisible by both 12 and 18 is:
A) 72
B) 36
C) 48
D) 18
Explanation: Option B) 36 is correct answer..
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Question 9: The HCF of smallest prime number and the smallest composite number is:
A) 1
B) 2
C) 3
D) 4
Explanation: Option B) 2 is correct answer..
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Question 10: LCM of 20, 28 and 36 is:
A) 140
B) 2520
C) 360
D) 1260
Explanation: Option D) 1260 is correct answer..
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