Problem Solving And Python Programming Set 33

Computer Science Engineering (CSE),

Information Technology Engineering (IT),

Electrical Engineering,

Civil Engineering,

Mechanical Engineering,

Programming Languages

Practice Mode Previous Next
On This Page

This set of Problem Solving and Python Programming Multiple Choice Questions & Answers (MCQs) focuses on Problem Solving And Python Programming Set 33

Q1 | Which of the following is not a declaration of the dictionary?
  • {1: ‘a’, 2: ‘b’}
  • dict([[1,”a”],[2,”b”]]) c) {1,”a”,2”b”}
  • d) { }
Answer: d) { }
Q2 | ,4))
  • 1
  • a
  • 4
  • invalid syntax for get method
Answer: a
Q3 | ,4))
  • error, invalid syntax
  • a
  • 5
  • 4
Answer: 4
Q4 | ))
  • {1: ‘a’, 2: ‘b’, 3: ‘c’}
  • c
  • {1: 3, 2: 3, 3: 3}
  • no method called setdefault() exists for dictionary
Answer: c
Q5 | ,"D") print(a)
  • {1: ‘a’, 2: ‘b’, 3: ‘c’, 4: ‘d’}
  • none
  • error
  • [1,3,6,10]
Answer: {1: ‘a’, 2: ‘b’, 3: ‘c’, 4: ‘d’}
Q6 | Which of the following isn’t true about dictionary keys?
  • more than one key isn’t allowed
  • keys must be immutable
  • keys must be integers
  • when duplicate keys encountered, the last assignment wins
Answer: keys must be integers
Q7 | ) print(a)
  • {1: 5}
  • {1: 5, 2: 3}
  • error, syntax error for pop() method d) {1: 5, 3: 4}
Answer: {1: 5, 2: 3}
Q8 | ,9))
  • 9
  • 3
  • too many arguments for pop() method
  • 4
Answer: 9
Q9 | Which of the statements about dictionary values if false?
  • more than one key can have the same value
  • the values of the dictionary can be accessed as dict[key]
  • values of a dictionary must be unique
  • values of a dictionary can be a mixture of letters and numbers
Answer: values of a dictionary must be unique
Q10 | If a is a dictionary with some key-value pairs, what does a.popitem() do?
  • removes an arbitrary element
  • removes all the key-value pairs
  • removes the key-value pair for the key given as an argument
  • invalid method for dictionary
Answer: removes an arbitrary element
Q11 | ] test[1] = 'D' del test[2] print(len(test))
  • 0
  • 2
  • error as the key-value pair of 1:’a’ is already deleted
  • 1
Answer: 2
Q12 | )
  • counter({4: 3, 2: 2, 3: 1})
  • {3:1}
  • {4:3}
  • [(4, 3)]
Answer: [(4, 3)]
Q13 | print(a)
  • true
  • false
Answer: false
Q14 | ][1])
  • [2,3,4]
  • 3
  • 2
  • an exception is thrown
Answer: 3
Q15 | ,2,3],"check")
  • syntax error
  • {1:”check”,2:”check”,3:”check”}
  • “check”
  • {1:none,2:none,3:none}
Answer: {1:”check”,2:”check”,3:”check”}
Q16 | If b is a dictionary, what does any(b) do?
  • returns true if any key of the dictionary is true
  • returns false if dictionary is empty
  • returns true if all keys of the dictionary are true
  • method any() doesn’t exist for dictionary
Answer: returns true if any key of the dictionary is true
Q17 | ]
  • an exception is thrown since the dictionary is empty
  • ‘ ‘
  • 1
Answer: an exception is thrown since the dictionary is empty
Q18 | ]
  • 1
  • 0
  • an exception is thrown
  • ‘ ‘
Answer: 0
Q19 | ]
  • 4
  • 0
  • an exception is thrown
  • 7
Answer: 7
Q20 | To open a file c:\scores.txt for reading, we use                            
  • infile = open(“c:\\scores.txt”, “r”)
  • infile = open(“c:\\scores.txt”, “r”)
  • infile = open(file = “c:\\scores.txt”, “r”)
  • infile = open(file = “c:\\scores.txt”, “r”)
Answer: infile = open(“c:\\scores.txt”, “r”)
Answer: infile = open(“c:\\scores.txt”, “r”)
Q21 | To open a file c:\scores.txt for writing, we use                          
  • outfile = open(“c:\\scores.txt”, “w”)
  • outfile = open(“c:\\scores.txt”, “w”)
  • outfile = open(file = “c:\\scores.txt”, “w”)
  • outfile = open(file = “c:\\scores.txt”, “w”)
Answer: outfile = open(“c:\\scores.txt”, “w”)
Answer: outfile = open(“c:\\scores.txt”, “w”)
Q22 | To open a file c:\scores.txt for appending data, we use                          
  • outfile = open(“c:\\scores.txt”, “a”)
  • outfile = open(“c:\\scores.txt”, “rw”)
  • outfile = open(file = “c:\\scores.txt”, “w”)
  • outfile = open(file = “c:\\scores.txt”, “w”)
Answer: outfile = open(“c:\\scores.txt”, “a”)
Q23 | Which of the following statements are true?
  • when you open a file for reading, if the file does not exist, an error occurs
  • when you open a file for writing, if the file does not exist, a new file is created
  • when you open a file for writing, if the file exists, the existing file is overwritten with the new file
  • all of the mentioned
Answer: all of the mentioned
Q24 | 1 TEXT FILES, READING AND WRITING FILES, FORMAT OPERATOR
  • infile.read(2)
  • infile.read()
  • infile.readline()
  • infile.readlines()
Answer: infile.read(2)
Q25 | To read the remaining lines of the file from a file object infile, we use                          
  • infile.read(2)
  • infile.read()
  • infile.readline()
  • infile.readlines()
Answer: infile.readlines()
Previous Next