McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Computer Science Engineering (CSE) , Information Technology Engineering (IT) , Electrical Engineering , Civil Engineering , Mechanical Engineering .
Chapters
| 1. |
What is the output of print 0.1 + 0.2 == 0.3? |
| A. | true |
| B. | false |
| C. | machine dependent |
| D. | error |
| Answer» B. false | |
| Explanation: neither of 0.1, 0.2 and 0.3 can be represented accurately in binary. the round off errors from 0.1 and 0.2 accumulate and hence there is a difference of 5.5511e-17 between (0.1 + 0.2) and 0.3. | |
| 2. |
Which of the following is not a complex number? |
| A. | k = 2 + 3j |
| B. | k = complex(2, 3) |
| C. | k = 2 + 3l |
| D. | k = 2 + 3j |
| Answer» C. k = 2 + 3l | |
| Explanation: l (or l) stands for long. | |
| 3. |
What is the type of inf? |
| A. | boolean |
| B. | integer |
| C. | float |
| D. | complex |
| Answer» C. float | |
| Explanation: infinity is a special case of floating point numbers. it can be obtained by float(‘inf’). | |
| 4. |
What does ~4 evaluate to? |
| A. | -5 |
| B. | -4 |
| C. | -3 |
| D. | +3 |
| Answer» A. -5 | |
| Explanation: ~x is equivalent to -(x+1). | |
| 5. |
What is the result of cmp(3, 1)? |
| A. | 1 |
| B. | 0 |
| C. | true |
| D. | false |
| Answer» A. 1 | |
| Explanation: cmp(x, y) returns 1 if x > y, 0 if x == y and -1 if x < y. | |
| 6. |
Which of the following is incorrect? |
| A. | float(‘inf’) |
| B. | float(‘nan’) |
| C. | float(’56’+’78’) |
| D. | float(’12+34′) |
| Answer» D. float(’12+34′) | |
| Explanation: ‘+’ cannot be converted to a float. | |
| 7. |
What is the result of round(0.5) – round(-0.5)? |
| A. | 1.0 |
| B. | 2.0 |
| C. | 0.0 |
| D. | value depends on python version |
| Answer» D. value depends on python version | |
| Explanation: the behavior of the round() | |
| 8. |
What does 3 ^ 4 evaluate to? |
| A. | 81 |
| B. | 12 |
| C. | 0.75 |
| D. | 7 |
| Answer» D. 7 | |
| Explanation: ^ is the binary xor operator. | |
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