Python Built In Functions — Part 2 MCQs with Explanations

The correct answer is Option A: float(). Here's why: The float() function is a built-in Python function used to convert a value to a floating-point number. It can be used to convert integers, strings, or other numerical types to floating-point numbers. For example, float(3) would return 3.0, float('3.14') would return 3.14, and float('hello') would raise a ValueError because it cannot convert the string 'hello' to a floating-point number. Therefore, the correct choice is Option A: float().

The correct answer is Option C: 5. Here's why: The math.sqrt() function returns the square root of a given number. In this case, math.sqrt(25) returns the square root of 25, which is 5. Then, the abs() function returns the absolute value of the result, which is 5. Therefore, the output of the code abs(math.sqrt(25)) is 5. So, the correct choice is Option C: 5.

The correct answer is Option B: ['Hello', 'World!'] . Here's the explanation: When you use the split() method on a string without passing any arguments, it splits the string by whitespace characters (space, tab, newline, etc.) and returns a list of the resulting substrings. In the given code, my_string.split() will split the string "Hello, World!" by whitespace characters and return a list containing two elements: "Hello" and "World!". Therefore, the output will be ['Hello', 'World!'].

For the call sum(2, 4, 6), the sum() function in Python expects an iterable (like a list, tuple, etc.) as its argument. When you pass individual values separated by commas, it will raise a TypeError because it doesn't accept multiple arguments like that. For the call sum([1, 2, 3]), it calculates the sum of the elements in the list [1, 2, 3], which would be 6. Therefore, the first call will result in an error, and the second call will result in the sum of the elements of the list, which is 6. So, the correct output is Error, 6.

The title() function in Python is used to capitalize the first letter of each word in a string. It returns a copy of the string with the first letter of each word capitalized. This function is particularly useful when you want to capitalize the first letter of each word in a sentence or a string.

Explanation: The float() function in Python can be called without any arguments, and it will return a floating-point number with a value of 0.0. It does not result in an error when called without arguments.

The pow() function in Python is used to raise a number x to the power of y, optionally taking a modulo z. The expression pow(x, y, z) is equivalent to (x ** y) % z, which means x raised to the power of y, then the result is taken modulo z.

The abs() function in Python returns the absolute value of a number, which is the distance of the number from zero on the number line, regardless of its sign.

The sorted() function in Python takes an iterable as an argument and returns a new sorted list containing all items from the iterable in ascending order.

The replace() function in Python replaces all occurrences of a specified substring with another substring in a given string. In this case, "Hello" is replaced with "Hi" in the string "Hello, World!", resulting in "Hi, World!".

The min() function in Python is used to find the minimum value among its arguments. It can accept multiple arguments, and they can be integers, floats, or strings. However, it does not accept non-numeric types like lists or tuples as arguments.

The divmod() function in Python returns a tuple containing the quotient and remainder when dividing the first argument by the second. In the first case, divmod(10.5, 5) returns (2.0, 0.5) because 10.5 divided by 5 results in 2.0 with a remainder of 0.5. In the second case, divmod(2.4, 1.2) returns (2.0, 0.0) because 2.4 divided by 1.2 results in 2.0 with no remainder.

The len() function in Python is used to find the number of elements in an object. In this case, len(my_list) will return the length of the list my_list, which contains four elements [1, 2, 3, 4]. Therefore, the output will be 4.

The complex() function in Python can accept a string argument representing a complex number in the form 'a+bj' or 'a-bj', where a and b are real numbers. In the first case, '2-3j', there are no spaces between the real and imaginary parts, so it is valid. However, in the second case, '2 - 3j', there is a space between 2 and -, making it an invalid input for the complex() function.

To print a list in reverse order in Python, you can use the reversed() function, which returns an iterator that yields items in reverse order. However, to display it as a list, you need to convert the iterator back to a list using the list() function. Therefore, list(reversed(l)) is the correct method to print the list l in reverse order.