1.7-1.9 questions

Question 1

Which of the following is NOT true about variables?

• Variable names can be words: such as temperature or height.
• The value stored by a variable cannot be changed after it is assigned.
• Variables are a name for a spot in the computer’s memory.
• The value stored by a variable can be changed after it is assigned.

Answer 1

• The value stored by a variable cannot be changed after it is assigned.

Question 2

Assume the user types in 7 and 10. What is output by the following?

num1 = input(“Enter a number: “)
num2 = input(“Enter a number: “)
print(num1 + num2)

17
710
No output, there is an error.
71

Answer 2

710

Question 3

Which command converts a number to a string?

num()

int()

str()

word()

Answer 3

str()

Question 4

Which of the following is true about strings?

• They do not let the user type in letters, numbers and words
• They cannot be stored to a variable
• An input (unless otherwise specified) will be stored as a string
• They are used for arithmetic calculations

Answer 4

• An input (unless otherwise specified) will be stored as a string

Question 5

What is wrong with the following code?

num1 = int(input(“Enter a number: “))
num2 = int(input(“Enter a number: “))
num3 = int(input(“Enter a number: “))
print(“The average is: “ + (num1 + num2 + num3)/3)

• The last line should be print(“The average is: (num1 + num2 + num/3))
• It needs a int() command
• It needs a str() command
• The variables should be 1num, 2num, 3num

Answer 5

it needs a str() command

Question 6

Which of the following lines of code correctly inputs a number?

• n = input(“Enter a value: “)
• n = str(input(“Enter a value: “))
• n = int(input(“Enter a value: “))
• n = num(input(“Enter a value: “))

Answer 6

• n = int(input(“Enter a value: “))

Question 7

\_\_\_\_\_\_\_\_\_\_\_\_\_ data is what is translated to digital format so it can be stored in a computer.
  Digital 
  Binary 
  Secondary 
  Analog

Answer 7

Analog

Question 8

Using a microphone to record a sound on your computer is an example of:

• analog to digital conversion
• main memory
• output
• digital to analog conversion

Answer 8

analog to digital conversion