Python Mod 2 Sec 2

What are literals in Python? Provide an example of a numeric literal.

• Literals in Python are data that is given in a variable or constant. An example of a numeric literal is 123.

• Literals in Python are functions that return data. An example of a numeric literal is 'abc'.

• Literals in Python are operators used in expressions. An example of a numeric literal is +.

• Literals in Python are errors in the code. An example of a numeric literal is None.

Answer explanation

Literals in Python represent fixed values assigned to variables or constants. The correct choice defines literals accurately, and 123 is a valid example of a numeric literal, as it is a direct representation of a number.

In the binary system, what is the decimal equivalent of the binary number 1010?

• The decimal equivalent of the binary number 1010 is 10.

• The decimal equivalent of the binary number 1010 is 8.

• The decimal equivalent of the binary number 1010 is 12.

• The decimal equivalent of the binary number 1010 is 15.

Answer explanation

To convert the binary number 1010 to decimal, calculate: (1×2^3) + (0×2^2) + (1×2^1) + (0×2^0) = 8 + 0 + 2 + 0 = 10. Thus, the decimal equivalent of 1010 is 10.

Which of the following bases do the octal and hexadecimal systems use?

• A) 2 and 8

• B) 8 and 16

• C) 10 and 16

• D) 2 and 10

Answer explanation

The octal system uses base 8, while the hexadecimal system uses base 16. Therefore, the correct answer is B) 8 and 16.

What is an integer in Python? Provide an example of a negative integer.

• An integer in Python is a whole number, and an example of a negative integer is -5.

• An integer in Python is a decimal number, and an example of a negative integer is -5.5.

• An integer in Python is a string, and an example of a negative integer is '-5'.

• An integer in Python is a boolean, and an example of a negative integer is False.

Answer explanation

An integer in Python is defined as a whole number, which can be positive or negative. The correct choice states that -5 is an example of a negative integer, accurately reflecting this definition.

Floating-point numbers in Python contain a fractional component. True or False?

• True

• False

Answer explanation

True. Floating-point numbers in Python represent real numbers and include a fractional component, allowing for the representation of values like 3.14 or -0.001.

How can you encode an apostrophe inside a string in Python?

• Use double quotes around the string

• Use a backslash before the apostrophe

• Use triple quotes around the string

• Use a forward slash before the apostrophe

Answer explanation

To encode an apostrophe in a string, you can use a backslash before it (e.g., 'It\'s a test'). This allows Python to interpret the apostrophe as part of the string rather than as a string delimiter.

What are the two constant objects used to represent truth values in Python?

• True and False

• Yes and No

• 1 and 0

• On and Off

Answer explanation

In Python, the two constant objects used to represent truth values are 'True' and 'False'. These are the standard boolean values, while 'Yes', 'No', '1', '0', 'On', and 'Off' are not recognized as boolean constants.