| 1. | Which one of the following is not a prime number? |
| a. | 31 |
| b. | 61 |
| c. | 71 |
| d. | 91 |
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Answer: (d).91
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| 2. | (112 x 5^4) = ? |
| a. | 67000 |
| b. | 70000 |
| c. | 76500 |
| d. | 77200 |
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Answer: (b).70000
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| 3. | It is being given that (2^32 + 1) is completely divisible by a whole number. Which of the following numbers is completely divisible by this number? |
| a. | (2^16 + 1) |
| b. | (2^16 - 1) |
| c. | (7 x 2^23) |
| d. | (2^96 + 1) |
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Answer: (d).(2^96 + 1)
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| 4. | What least number must be added to 1056, so that the sum is completely divisible by 23 ? |
| a. | 2 |
| b. | 3 |
| c. | 18 |
| d. | 21 |
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Answer: (a).2
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| 5. | 1397 x 1397 = ? |
| a. | 1951609 |
| b. | 1981709 |
| c. | 18362619 |
| d. | 2031719 |
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Answer: (a).1951609
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