Programming Quiz

What is the length of the string "Hello, World!"?

• 10

• 12

• 13

• 14

Which of these statements is true about strings?

• Strings are mutable (can be modified directly).

• Strings are immutable (cannot be modified directly).

• Strings are only numeric.

• Strings cannot store special characters.

What is the index of the first element in an array?

• 1

• 0

• -1

• Depends on the language

Which of the following methods checks if a substring exists within a string?

• replace()

• find()

• split()

• sort()

If str1 = "hello", what will str1[1:4] return?

• "h"

• "ell"

• "ello"

• An error

What will the result of len(" ") be?

• 0

• 1

• 2

• An error

What is the output of the following operation? Input string: "Hello" Operation: Reverse the string.

• "olleH"

• "Hello"

• "olle"

• "Holle"

What is an array in programming?

• A collection of different data types

• A collection of elements of the same data type

• A variable that can store multiple values of different types

• A fixed number of variables

What happens if you try to access an element outside the bounds of an array?

• Compilation error

• Undefined behavior

• Runtime error

• The program will ignore it

What is the time complexity to access an element in an array by index?

• O(n)

• O(log n)

• O(1)

• O(n^2)