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Q1
Assume `s` is a `str` variable. What is the type of the expression below?
```python
"".join(sorted(set(s.lower())))
```
Single correct
Q2
Consider the following Python code. How many elements will be present in `result`?
```
P = {1, 2, 3, 4}
Q = {3, 4, 5, 6}
R = {4, 5, 6, 7}
S = {2, 4, 6, 8}
result = ((P | Q) - R) & S
print(result)
```
Integer answer
Q3
When will the following code snippet output `True`?
```
word_1 = input()
word_2 = input()
flag = True
if len(word_1) < len(word_2):
for ch in word_1:
if ch not in word_2:
flag = False
else:
for ch in word_2:
if ch not in word_1:
flag = False
print(flag)
```
Single correct
Q4
A programmer wishes to write code that accepts a string `word` as input and computes a list `V` that stores the frequencies of occurrence of the vowels `'aeiou'` in the string. Each element in `V` corresponds to the frequency of one vowel in the string:
- `V[0]`: frequency of `'a'`
- `V[1]`: frequency of `'e'`
- `V[2]`: frequency of `'i'`
- `V[3]`: frequency of `'o'`
- `V[4]`: frequency of `'u'`
Study the two codes given below and determine their correctness for this task. A code is correct only if it is error-free and produces the correct output for any given input. Assume that the input to the code will have only lower-case letters.
Code-1
```
word = input()
V = []
for i in range(5):
V[i] = 0
vowels = 'aeiou'
for char in word:
if char in vowels:
index = vowels.index(char)
V[index] += 1
```
Code-2
```
word = input()
V = []
for i in range(5):
V.append(0)
vowels = 'aeiou'
for char in word:
if char in vowels:
index = vowels.index(char)
V[index] += 1
```
Single correct
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