SSC CGL Quant – Number System – Level 1 · Warm-up · Tier I Level
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1 has only one factor, so it is not prime; W ⊂ Z, so II is true.
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SSC CGL Quant – Number System – Level 1 · Warm-up · Tier I Level – 12 questions, subject: Quantitative Aptitude. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.
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1.
Which of the following is an irrational number?
Correct Answer: C [√72]
Explanation:
72 is not a perfect square, so √72 = 6√2 is irrational; √81 = 9, 0.36 = 9/25 and 355/113 are rational.
2.
The HCF of 108 and 156 is:
Correct Answer: A [12]
Explanation:
108 = 2² × 3³, 156 = 2² × 3 × 13 → 2² × 3 = 12.
3.
The LCM of 18 and 24 is:
Correct Answer: D [72]
Explanation:
18 = 2 × 3², 24 = 2³ × 3 → 2³ × 3² = 72.
4.
How many factors does 200 have?
Correct Answer: B [12]
Explanation:
200 = 2³ × 5² → (3 + 1)(2 + 1) = 12.
5.
How many prime numbers lie between 50 and 70?
Correct Answer: B [4]
Explanation:
53, 59, 61, 67.
6.
Which of the following pairs is co-prime?
Correct Answer: C [(15, 28)]
Explanation:
HCF(15, 28) = 1; the others share 7, 9 and 13.
7.
The product of two numbers is 2,160 and their HCF is 12. Their LCM is:
Correct Answer: A [180]
Explanation:
LCM = 2,160 ÷ 12 = 180.
8.
What is the remainder when 1,000 is divided by 7?
Correct Answer: D [6]
Explanation:
1,000 = 7 × 142 + 6.
9.
The smallest number divisible by each of 9, 12 and 20 is:
Correct Answer: D [180]
Explanation:
LCM = 2² × 3² × 5 = 180.
10.
2⁵ × 2³ ÷ 2⁴ = ?
Correct Answer: C [16]
Explanation:
Powers: 5 + 3 − 4 = 4 → 2⁴ = 16.
11.
Fill in the blankThe only even prime number is ____.
Correct Answer: A [2]
Explanation:
Every other even number has the factor 2 besides 1 and itself.
12.
Statement-basedWhich is/are correct?
I. 1 is a prime number.
II. Every whole number is an integer.
I. 1 is a prime number.
II. Every whole number is an integer.
Correct Answer: B [Only II]
Explanation:
1 has only one factor, so it is not prime; W ⊂ Z, so II is true.
➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 Quantitative Aptitude book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-quantitative-aptitude
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