Page 436 - Computer Science V2.0 Class 11

9. Consider the following dictionary:
>>> myDict = [1,2,{1:'One',2:{3:'Three',4:'Four',5:'Five'},6:'Six'},3,4]
Which of the following outputs 'Four' from myDict?
a. myDict[2][1][1]
b. myDict[2][2][4]
c. myDict[1][2][4]

d. myDict[1][1][1]
10. What will be the output produced on execution of the following code snippet?

s = ''
d = {'1':'One','2':'Two'}
for k,v in d.items():
s = k + v

print(s)
a. An error would occur
b. 1One2Two
c. 2Two
d. 1One

B. State whether the following statements are True or False:
1. A dictionary is a sequence of objects over which we can iterate in a for statement. _________
2. Dictionaries are immutable. _________
3. All the keys in a dictionary must be of the same type. _________

4. A key in a dictionary can not be a mutable data type. ` _________
5. If d is a dictionary, d[0] will yield its first key. _________
6. If d is a dictionary, d[0] will yield an error because a dict object is not subscriptable. _________
7. If d is a dictionary, d.keys()[0] will yield its first key. _________

C. Fill in the blanks.
1. The expression print(len({1: 2, 2: 3, 1:2})) yields ______________.
2. Consider a dictionary:
myDict = {1:{2}, 2: {3: 5}}
The expression 3 in myDict yields ______________.
3. While working in IDLE environment, a dictionary rollnoMarks of key value pairs rollNo: marks has just been
created:
>>> rollnoMarks = {1:60,2:25,3:90,4:32,5:12,6:78}
The function call _________ will yield the marks for the candidate with rollNo 4 and remove the pair 4:32 from
rollnoMarks.
4. Consider the dictionary given in Ques 3. The expression print(sorted(rollnoMarks.values())) yields
_______________.
5. Consider a dictionary having the student details as follows:

studentDetails = {'Name':'Varun','Roll No': 5,'Marks':90}
The expression print(studentDetails.get('Roll No')) yields ______________ .
6. Consider the same dictionary given in Ques. 5, the expression print(studentDetails.get('Roll Number'))
yields ______________ .

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