Grade 12 Computers Quiz

What is a half adder?

• A digital circuit that adds two single binary digits and produces a sum and a carry as the output

• A tool for converting decimal numbers to binary

• A type of computer software used for editing photos

• A device used to measure the weight of objects

Explain the truth table of a half adder.

• The truth table for a half adder consists of four rows, with inputs X and Y, and outputs Product and Quotient.

• The truth table for a half adder consists of two rows, with inputs A and B, and outputs Sum and Difference.

• The truth table for a half adder consists of six rows, with inputs A and B, and outputs Sum and Carry.

• The truth table for a half adder consists of four rows, with inputs A and B, and outputs Sum and Carry.

What are the inputs and outputs of a half adder?

• Two input bits and two output bits

• Four input bits and two output bits

• Three input bits and one output bit

• One input bit and three output bits

How is the sum and carry calculated in a half adder?

• The sum is calculated using OR gate and the carry is calculated using NOT gate.

• The sum is calculated using AND gate and the carry is calculated using XOR gate.

• The sum is calculated using NAND gate and the carry is calculated using NOR gate.

• The sum is calculated using XOR gate and the carry is calculated using AND gate.

What is a full adder and how is it different from a half adder?

• A full adder and a half adder are the same thing

• A full adder can add three input bits and produce a carry-out, while a half adder can only add two input bits.

• A full adder cannot produce a carry-out, while a half adder can produce a carry-out

• A full adder can only add two input bits and produce a carry-out, while a half adder can add three input bits

Describe the working of a full adder.

• A full adder is a digital circuit that performs addition of three binary numbers: A, B, and a carry input C-in. It produces a sum S and a carry output C-out.

• A full adder is a device used to subtract three binary numbers

• A full adder is a digital circuit that performs multiplication of three binary numbers

• A full adder is a mechanical device used to perform addition of decimal numbers

What is the truth table of a full adder?

• The truth table of a full adder consists of 8 rows.

• The truth table of a full adder consists of 4 rows.

• The truth table of a full adder consists of 10 rows.

• The truth table of a full adder consists of 6 rows.

What is an XOR gate and how is it used in digital circuits?

• An XOR gate is a digital logic gate that gives a high output (1) only if the number of 1's in the input is even.

• An XOR gate is a digital logic gate that gives a low output (0) only if the number of 1's in the input is odd.

• An XOR gate is a digital logic gate that gives a low output (0) only if both inputs are 1.

• An XOR gate is a digital logic gate that gives a high output (1) only if the number of 1's in the input is odd.

Explain the working of an XOR gate with an example.

• The working of an XOR gate can be explained with the example of a toaster. If either one or the other toaster is turned on, the bread will be toasted. If both toasters are on or off, the bread will not be toasted.

• The working of an XOR gate can be explained with the example of a car. If either the front door or the back door is open, the car alarm will sound. If both doors are open or closed, the car alarm will not sound.

• The working of an XOR gate can be explained with the example of a TV. If either the volume or the channel is changed, the TV will display a different program. If both the volume and the channel are changed or not changed, the TV will not display a different program.

• The working of an XOR gate can be explained with the example of a light switch. If either one or the other switch is turned on, the light will be on. If both switches are on or off, the light will be off.

Differentiate between an XOR gate and an OR gate.

• XOR gate gives a true output when all inputs are true, while an OR gate gives a true output when at least one input is false.

• XOR gate gives a true output only when the number of true inputs is odd, while an OR gate gives a true output when at least one input is true.

• XOR gate gives a true output when all inputs are true, while an OR gate gives a true output when all inputs are false.

• XOR gate gives a true output when all inputs are false, while an OR gate gives a true output when all inputs are true.