Problem Solving And Python Programming Set 3

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This set of Problem Solving and Python Programming Multiple Choice Questions & Answers (MCQs) focuses on Problem Solving And Python Programming Set 3

Q1 | Operators with the same precedence are evaluated in which manner?
  • left to right
  • right to left
  • can’t say
  • none of the mentioned
Answer: left to right
Explaination:
none.
Q2 | What is the output of this expression, 3*1**3?
  • 27
  • 9
  • 3
  • 1
Answer: 3
Explaination:
first this expression will solve 1**3 because exponential has higher precedence than multiplication, so 1**3 = 1 and 3*1 = 3. final answer is 3.
Q3 | Which one of the following has the same precedence level?
  • addition and subtraction
  • multiplication, division and addition
  • multiplication, division, addition and subtraction
  • addition and multiplication
Answer: addition and subtraction
Explaination:
“addition and subtraction” are at the same precedence level. similarly, “multiplication and division” are at the same precedence level. however, multiplication and division operators are at a higher precedence level than addition and subtraction operators.
Q4 | The expression Int(x) implies that the variable x is converted to integer.
  • true
  • false
Answer: true
Explaination:
none.
Q5 | Which one of the following has the highest precedence in the expression?
  • exponential
  • addition
  • multiplication
  • parentheses
Answer: parentheses
Explaination:
just remember: pemdas, that is, parenthesis, exponentiation, division, multiplication, addition, subtraction. note that the precedence order of division and multiplication is the same. likewise, the order of addition and subtraction is also the same.
Q6 | Which of these in not a core data type?
  • lists
  • dictionary
  • tuples
  • class
Answer: class
Explaination:
class is a user defined data type.
Q7 | Given a function that does not return any value, What value is thrown by default when executed in shell.
  • int
  • bool
  • void
  • none
Answer: none
Explaination:
python shell throws a nonetype object back.
Q8 | 3 DATA TYPES
  • he
  • lo
  • olleh
  • hello
Answer: he
Explaination:
we are printing only the 1st two bytes of string and hence the answer is “he”.
Q9 | Which of the following will run without errors?
  • round(45.8)
  • round(6352.898,2,5)
  • round()
  • round(7463.123,2,1)
Answer: round(45.8)
Explaination:
execute help(round) in the shell to get details of the parameters that are passed into the round function.
Q10 | What is the return type of function id?
  • int
  • float
  • bool
  • dict
Answer: int
Explaination:
execute help(id) to find out details in python shell.id returns a integer value that is unique.
Q11 | >>>x = 13 ? 2
  • x = 13 // 2
  • x = int(13 / 2)
  • x = 13 % 2
  • all of the mentioned
Answer: all of the mentioned
Explaination:
// is integer operation in python
Q12 | >>>example("hello")
  • indentation error
  • cannot perform mathematical operation on strings
  • hello2
  • hello2hello2
Answer: indentation error
Explaination:
python codes have to be indented properly.
Q13 | , 23, 'hello', 1]
  • list
  • dictionary
  • array
  • tuple
Answer: list
Explaination:
list data type can store any
Q14 | In order to store values in terms of key and value we use what core data type.
  • list
  • tuple
  • class
  • dictionary
Answer: dictionary
Explaination:
dictionary stores values in terms of keys and values.
Q15 | Which of the following results in a SyntaxError?
  • ‘”once upon a time…”, she said.’
  • “he said, ‘yes!\” c) ‘3\\’
  • d) ”’that’s okay”’
Answer: d) ”’that’s okay”’
Explaination:
carefully look at the colons.
Q16 | >>>average = (grade1 + grade2) / 2
  • 85.0
  • 85.1
  • 95.0
  • 95.1
Answer: 85.0
Explaination:
cause a decimal value of 0 to appear as output.
Q17 | What is the return value of trunc()?
  • int
  • bool
  • float
  • none
Answer: int
Explaination:
execute help(math.trunc) to get details.
Q18 | What is the output of print 0.1 + 0.2 == 0.3?
  • true
  • false
  • machine dependent
  • error
Answer: false
Explaination:
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.
Q19 | Which of the following is not a complex number?
  • k = 2 + 3j
  • k = complex(2, 3)
  • k = 2 + 3l
  • k = 2 + 3j
Answer: k = 2 + 3l
Explaination:
l (or l) stands for long.
Q20 | What is the type of inf?
  • boolean
  • integer
  • float
  • complex
Answer: float
Explaination:
infinity is a special case of floating point numbers. it can be obtained by float(‘inf’).
Q21 | What does ~4 evaluate to?
  • -5
  • -4
  • -3
  • +3
Answer: -5
Explaination:
~x is equivalent to -(x+1).
Q22 | What is the result of cmp(3, 1)?
  • 1
  • 0
  • true
  • false
Answer: 1
Explaination:
cmp(x, y) returns 1 if x > y, 0 if x == y and -1 if x < y.
Q23 | Which of the following is incorrect?
  • float(‘inf’)
  • float(‘nan’)
  • float(’56’+’78’)
  • float(’12+34′)
Answer: float(’12+34′)
Explaination:
‘+’ cannot be converted to a float.
Q24 | What is the result of round(0.5) – round(-0.5)?
  • 1.0
  • 2.0
  • 0.0
  • value depends on python version
Answer: value depends on python version
Explaination:
the behavior of the round()
Q25 | What does 3 ^ 4 evaluate to?
  • 81
  • 12
  • 0.75
  • 7
Answer: 7
Explaination:
^ is the binary xor operator.
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