97. OCR A Level (H046-H446) SLR15 – 1.4 Define problems using Bo

What does binary represent in computers?

• Decimal numbers

• Hexadecimal numbers

• Whether a statement is true or false

• Complex mathematical problems

Answer explanation

Binary in computers represents whether a statement is true or false, not decimal or hexadecimal numbers or complex mathematical problems.

Why is binary used in electronic circuits?

• It requires less energy

• It supports faster processing speeds

• It's easier to build circuits with two states

• It allows for more data storage

Answer explanation

Binary is used in electronic circuits because it's easier to build circuits with two states, simplifying the design and operation of the circuits.

Who is credited with proposing the approach to logic known as Boolean Algebra?

• Charles Babbage

• George Boole

• Albert Einstein

• Isaac Newton

Answer explanation

George Boole is credited with proposing the approach to logic known as Boolean Algebra.

In Boolean logic, what are the possible values of an input or variable?

• 1 or 2

• 0 or 2

• 0 or 1

• True or False

Answer explanation

In Boolean logic, the possible values of an input or variable are 0 or 1, representing False or True respectively.

What does the NOT operation do in Boolean logic?

• It reverses the input

• It divides the input

• It adds two inputs

• It compares two inputs

Answer explanation

The NOT operation in Boolean logic reverses the input, changing true to false and false to true.

Which symbol is used by OCR to represent the NOT operation in Boolean logic?

• A carrot or mountain style symbol

• A horizontal straight line

• A large symbol on the left

• A V shape

Answer explanation

The symbol used by OCR to represent the NOT operation in Boolean logic is a large symbol on the left.

What is the result of an AND operation when both inputs are 1?

• 0

• 1

• 2

• Undefined

Answer explanation

The result of an AND operation when both inputs are 1 is 1 because in AND logic, both inputs must be 1 for the output to be 1.

What does the OR operation signify in Boolean logic?

• Addition of inputs

• If either input is 1, the output is 1

• If both inputs are 1, the output is 0

• Multiplication of inputs

Answer explanation

In Boolean logic, the OR operation signifies that if either input is 1, the output is 1. This means that the output is true if at least one of the inputs is true.

What is the key difference between OR and XOR operations?

• XOR requires both inputs to be 1 for the output to be 1

• There is no difference

• OR requires only one input to be 1 for the output to be 1

• XOR requires only one input to be 1, but not both, for the output to be 1

Answer explanation

XOR requires only one input to be 1, but not both, for the output to be 1

What symbol is used to represent equivalence in Boolean logic?

• A triple equals sign

• A double equals sign

• A double-headed arrow

• A single equals sign

Answer explanation

The symbol used to represent equivalence in Boolean logic is a triple equals sign, not a double equals sign, a double-headed arrow, or a single equals sign.