Quiz on String for DSA

This quiz on strings in DSA covers key concepts like string manipulation, pattern matching, and common algorithms. It challenges your understanding of string-related operations such as searching, sorting, and substring handling. Perfect for reinforcing core DSA skills and preparing for technical interviews.

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Question 1

What will be the output of the following code snippet?

str = "Hello"
print(str[0])

  • "Hello"

  • "H"

  • "o"

  • "e"

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Question 2

Which of the following strings is a valid string in most programming languages?

  • "Hello World!"

  • Hello World!

  • "Hello" World!

  • Hello"World"

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Question 3

In string processing, what does the term "lexicographical order" mean?

  • Characters are sorted based on their frequency in the string.

  • Characters are sorted based on their Unicode or ASCII values.

  • Characters are sorted based on their appearance in the alphabet.

  • Characters are sorted by their positions in the string.

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Question 4

What is the primary difference between a substring and a subsequence of a string?

  • A substring and a subsequence are the same thing.

  • A substring is a contiguous portion of the string, while a subsequence can be obtained by deleting some or no characters from the string without changing the order of the remaining characters.

  • A substring is always smaller than the original string, while a subsequence can be larger.

  • A subsequence is a substring, but a substring is not a subsequence.

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Question 5

Which of the following statements is true regarding mutable and immutable strings?

  • Immutable strings can be modified in place, while mutable strings cannot be modified after creation.

  • Mutable strings can be modified in place, while immutable strings cannot be modified after creation.

  • There is no distinction between mutable and immutable strings.

  • Both mutable and immutable strings can be modified in place, but immutable strings are more efficient.

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Question 6

Which of the following is the correct definition of a palindrome string?

  • A string with alternating characters

  • A string with no repeating characters

  • A string that reads the same forward and backward

  • A string with only numeric characters

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Question 7

Which of the following is the correct condition for two strings to be anagrams?

  • Both strings must have the same length and contain the same characters in any order.

  • Both strings must have the same length and contain only vowels.

  • Both strings must have the same length and contain different characters.

  • Both strings must have the same length and contain characters in the same order.

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