1. What is the output of print 0.1 + 0.2 == 0.3?
a) True
b) False
c) Machine dependent
d) Error
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
Explanation: l (or L) stands for long.
3. What is the type of inf?
a) Boolean
b) Integer
c) Float
d) Complex
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
Explanation: ~x is equivalent to -(x+1).
5. What does ~~~~~~5 evaluate to?
a) +5
b) -11
c) +11
d) -5
Explanation: ~x is equivalent to -(x+1).
~~x = – (-(x+1) + 1) = (x+1) – 1 = x
~~x is equivalent to x
Extrapolating further ~~~~~~x would be same as x in the final result.
x value is given as 5 and “~” is repeated 6 times. So, the answer for “~~~~~~5” is 5.
6. Which of the following is incorrect?
a) x = 0b101
b) x = 0x4f5
c) x = 19023
d) x = 03964
Explanation: Numbers starting with a 0 are octal numbers but 9 isn’t allowed in octal numbers.
7. What is the result of cmp(3, 1)?
a) 1
b) 0
c) True
d) False
Explanation: cmp(x, y) returns 1 if x > y, 0 if x == y and -1 if x < y.
8. Which of the following is incorrect?
a) float(‘inf’)
b) float(‘nan’)
c) float(’56’+’78’)
d) float(’12+34′)
Explanation: ‘+’ cannot be converted to a float.
9. 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
Explanation: The behavior of the round() function is different in Python 2 and Python 3. In Python 2, it rounds off numbers away from 0 when the number to be rounded off is exactly halfway through. round(0.5) is 1 and round(-0.5) is -1 whereas in Python 3, it rounds off numbers towards nearest even number when the number to be rounded off is exactly halfway through.
10. What does 3 ^ 4 evaluate to?
a) 81
b) 12
c) 0.75
d) 7
Explanation: ^ is the Binary XOR operator.