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

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22 Oct, 2025
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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Question 11: The LCM of 6 and 8 is:
A) 12
B) 16
C) 24
D) 48
Explanation: Option C) 24 is correct answer..
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Question 12: If HCF (a, b) = 9 and LCM (a, b) = 270, and a = 45, then b = ?
A) 81
B) 54
C) 27
D) 60
Explanation: Option B) 54 is correct answer..
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Question 13: Which of the following has a terminating decimal expansion?
A) 3/8
B) 1/7
C) 2/11
D) 1/3
Explanation: Option A) 24 is correct answer..
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Question 14: The decimal expansion of 1/11 is:
A) Terminating
B) Non-terminating, recurring
C) Non-terminating, non-recurring
D) None of these
Explanation: Option B) Non-terminating, recurring is correct answer..
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Question 15: Which of these is not a prime number?
A) 2
B) 9
C) 3
D) 7
Explanation: Option B) 9 is correct answer..
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Question 16: The product of two consecutive positive integers is divisible by:
A) 2 only
B) 3 only
C) 4
D) None
Explanation: Option A) 2 only is correct answer..
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Question 17: Which of the following fractions gives a non-terminating decimal expansion?
A) 7/16
B) 9/25
C) 11/30
D) 4/5
Explanation: Option C) 11/30 is correct answer..
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Question 18: The smallest number which when divided by 12, 15, and 20 leaves a remainder 3 in each case is:
A) 60
B) 63
C) 123
D) 120
Explanation: Option B) 63 is correct answer..
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Question 19:If a number is exactly divisible by 9 and 10, then it must also be divisible by:
A) 45
B) 90
C) 180
D) 30
Explanation: Option B) 90 is correct answer..
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Question 20: Which of the following is a rational number?
A) √3
B) π
C) 0.125
D) √5
Explanation: Option C) 0.125 is correct answer..
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Correct Answers: 0

Wrong Answers: 0

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