Y9.U1.Craking the code - quiz

What is the binary representation of the decimal number 10?

• 1100

• 1010

• 1001

• 1011

How many bits are in a byte?

• 7

• 16

• 8

• 4

Explain the Caesar cipher in your own words.

• The Caesar cipher replaces letters with numbers based on their position in the alphabet.

• The Caesar cipher is a substitution cipher that shifts letters by a fixed number.

• The Caesar cipher is a method of encoding that involves rearranging the letters in a word.

• The Caesar cipher is a type of encryption that uses complex algorithms.

What is the purpose of encryption in data security?

• The purpose of encryption in data security is to protect sensitive information from unauthorized access.

• To reduce the size of data files.

• To make data more accessible to everyone.

• To increase the speed of data transmission.

How can you convert a binary number to decimal using a spreadsheet?

• Use the formula =BIN2DEC(cell_reference) in a spreadsheet.

• Manually calculate the decimal value by adding powers of two.

• Convert the binary number to hexadecimal first, then to decimal.

• Use the formula =DEC2BIN(cell_reference) in a spreadsheet.

What does VLOOKUP do in a spreadsheet?

• VLOOKUP creates a chart from selected data.

• VLOOKUP formats cells based on their values.

• VLOOKUP calculates the sum of a range of cells.

• VLOOKUP searches for a value in the first column and returns a corresponding value from a specified column.

What is a reverse cipher and how does it work?

• A reverse cipher is a method that substitutes letters with numbers.

• A reverse cipher encrypts messages by shifting characters forward in the alphabet.

• A reverse cipher is an encryption method that reverses the order of characters in a message.

• A reverse cipher is a technique that duplicates the original message in reverse order.

Convert the binary number 1011 to decimal.

• 14

• 10

• 11

• 12

How many different numbers can be represented with 8 bits?

• 128

• 256

• 512

• 64

What is the purpose of encryption?