CS J277 Unit 8 Logic and Languages

Which of the following statements about AND gates is correct?

• The output is TRUE if either input is TRUE

• The output is TRUE only if both the inputs are TRUE

• The output is TRUE if neither input is TRUE

Which of the following statements about OR gates is correct?

• The output is TRUE if neither input is TRUE

• The output is TRUE only if both the inputs are TRUE

• The output is TRUE if either or both inputs is TRUE

Which of the following statements about NOT gates is correct?

• The output is TRUE if the input is FALSE, and output is FALSE if the input is TRUE

• The output is TRUE if the input is TRUE, and the output is FALSE if the input is FALSE

• The output is always FALSE, regardless of the state of the input

Which of the following statements about logic gates is correct?

• Only AND and OR gates can be combined to generate a desired output

• AND, OR and NOT gates can be used in any combination to generate a desired output

• AND and OR gates must always preceed a NOT gate

Which gate tis this

• AND

• NOT

• OR

• NAND

Which gate is this?

• AND

• OR

• NOT

• NAND

• XOR

Which gate is this

• AND

• OR

• NOT

• NAND

Emma is writing a program to encrypt text entered by a user. Only letters, spaces and punctuation marks can be encrypted. Each letter in the text is replaced by the letter three places further down the alphabet. A is replaced by D, b by e, … Y by B, z by c. Spaces and punctuation marks are not changed. Which is the correct replacment below

• Input Text = HEY , Output Text = LIA

• Input Text = HEY , Output Text = KHB

• Input Text = HEY , Output Text = JGE

Emma is writing a program to encrypt text entered by a user. Only letters, spaces and punctuation marks can be encrypted. Each letter in the text is replaced by the letter three places further down the alphabet. A is replaced by D, b by e, … Y by B, z by c. Spaces and punctuation marks are not changed. Which is the correct answer below

• Input XYZ123 Output ABC

• Input XYZ123 Output Error

Emma is writing a program to encrypt text entered by a user. Only letters, spaces and punctuation marks can be encrypted. Each letter in the text is replaced by the letter three places further down the alphabet. A is replaced by D, b by e, … Y by B, z by c. Spaces and punctuation marks are not changed. Which is the correct answer below?

• Input I’m Zac Output L’p Cdf

• Input I’m Zac Output L’q Def