Virtual Labs

1. What is a string in computer science?

a: A sequence of characters Explanation

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b: A single character Explanation

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c: A number Explanation

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d: A type of loop Explanation

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2. Which of the following is a palindrome?

a: racecar Explanation

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b: hello Explanation

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c: world Explanation

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d: python Explanation

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3. What is the output for the input 'Madam, I'm Adam' in a palindrome detector (ignoring spaces and punctuation)?

a: YES Explanation

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b: NO Explanation

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c: Error Explanation

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d: madam Explanation

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4. Which operation checks if one string can be obtained from another by deleting some characters (without reordering)?

a: Substring Explanation

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b: Subsequence Explanation

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c: Concatenation Explanation

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d: Reversal Explanation

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5. What is the output for input 'hyderabad her' 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: her Explanation

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6. Which of the following is NOT a string operation?

a: Concatenation Explanation

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b: Reversal Explanation

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c: Multiplication Explanation

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d: Substring extraction Explanation

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7. Which of the following best describes a palindrome?

a: A string that reads the same forwards and backwards 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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8. What is the time complexity of checking if a string of length n is a palindrome?

a: O(1) Explanation

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b: O(n) Explanation

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c: O(n^2) Explanation

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d: O(log n) Explanation

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9. Which of the following statements about subsequences is true?

a: A subsequence must be contiguous Explanation

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b: A subsequence can skip characters but must preserve order Explanation

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c: A subsequence can reorder characters Explanation

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d: A subsequence is always shorter than the original string Explanation

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10. Which of the following is an application of string operations?

a: Text search Explanation

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b: DNA sequencing Explanation

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c: Data validation Explanation

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d: All of the above Explanation

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String Operations