Number System Practice Test 7 is a moderate sectional-style set of 20 multiple-choice questions on number system, created by Xigma Academy for candidates preparing for SSC CGL and other staff-selection and government recruitment exams. It is test 7 in the Number System series on TestMint. This test is free to attempt.
What this test covers
- Number System: 20 questions
Test details
| Questions | 20 |
|---|---|
| Duration | 20 minutes |
| Marks | 1 per question, 20 in total |
| Negative marking | None |
| Difficulty | Mostly moderate |
| Access | Free |
A sample question from this test
What is the unit digit of 3^61?
- 3
- -7
- -2
- 8
Answer: A. 3. Unit digits of powers of 3 repeat every 4 powers. 61 leaves remainder 1 when divided by 4, so the unit digit is the same as that of 3^1, which is 3.
How to approach this test
Use remainders and cycles: unit digits of powers repeat in short cycles, and divisibility rules save long division.
This set mixes straightforward questions with a few that need an extra step, so it works well as a checkpoint once the basics are comfortable. At 20 questions in 20 minutes, you have about 60 seconds per question on average. After you submit, review every wrong or guessed answer using the explanations.
Keep practising
Continue with all SSC CGL mock tests, free mock tests, a guide to preparing this topic and how to review your mistakes.