Virtual Labs

1. Which of the following is NOT a palindrome?

a: level Explanation

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b: noon Explanation

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c: apple Explanation

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d: radar Explanation

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2. What is the output for input 'racecar' in a palindrome detector?

a: YES Explanation

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b: NO Explanation

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c: racecar Explanation

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d: Error Explanation

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3. Which of the following is a subsequence of 'algorithm'?

a: algo Explanation

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b: log Explanation

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c: grim Explanation

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d: math Explanation

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4. What is the output for input 'hyderabad dear' in the subsequence checker?

a: YES Explanation

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b: NO Explanation

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c: Error Explanation

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d: dear Explanation

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5. Which operation is used to join two strings together?

a: Concatenation Explanation

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b: Reversal Explanation

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c: Subsequence Explanation

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d: Substring Explanation

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6. What is the time complexity of checking if one string is a subsequence of another (lengths m and n)?

a: O(1) Explanation

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b: O(m + n) Explanation

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c: O(mn) Explanation

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d: O(log n) Explanation

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7. Which of the following is true about palindromes?

a: They ignore spaces and punctuation Explanation

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b: They require all lowercase letters Explanation

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c: They must be at least 5 characters Explanation

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d: They are always numbers Explanation

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8. Which of the following is NOT a valid string operation?

a: Substring extraction Explanation

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b: Pattern matching Explanation

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c: Sorting characters Explanation

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d: Integer division Explanation

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9. Which of the following is an application of subsequence checking?

a: DNA sequence analysis Explanation

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b: Text search Explanation

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c: Spell checking Explanation

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d: All of the above Explanation

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10. Which of the following best describes a substring?

a: A sequence of characters that appears consecutively in a string Explanation

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b: A string with only vowels Explanation

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c: A string with only consonants Explanation

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d: A string with spaces only Explanation

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String Operations