Number System
JKSSB Junior Assistant · Numerical Ability · 97 practice questions with answers and explanations: 35 Easy, 34 Medium, 28 Hard.
Sample questions
Sample Easy question 1
Which of the following is a prime number: 51, 53, 55, 57?
- 51
- 53
- 55
- 57
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Answer: B. 51=3×17, 55=5×11, 57=3×19, but 53 is prime.
Sample Medium question 2
Find the remainder when 2¹⁰ is divided by 7.
- 1
- 2
- 3
- 4
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Answer: B. 2¹⁰ = 1024 = 146×7 + 2, so the remainder is 2.
Sample Hard question 3
Find the HCF of 1001 and 1105.
- 7
- 11
- 13
- 17
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Answer: C. The highest common factor of 1001 and 1105 is 13.