Intro to CS Unit 3 Practice test

Front

When do you use an else statement?

Back

To tell what will happen when an if-statement is false

Answer explanation

The else case will run when all of the other conditions checked are false

Front

Which of the following is NOT true about all algorithms?
- All algorithms can only do number calculations
- All algorithms have clear instructions
- All algorithms stop in a finite amount of time
- All algorithms have an order

Back

All algorithms can only do number calculations

Answer explanation

Algorithms are not restricted to only number calculations, they can do other processes as well.

Front

The following code could be rewritten using:
if (x > 12):
if (x < 34):

Back

and

Answer explanation

This is correct because both conditions need to be true

Front

Write the code to test if the number in the variable text1 is greater than 15.

Back

if (text1 > 15):

Answer explanation

This correctly tests if text1 is greater than the number 15

Front

Write the code to test if the number 78 is stored in the variable text1:

Back

if (text1 == 78):

Answer explanation

This correctly tests if text1 equals the number 78

Front

Write the code to test if the variables num1 and num2 are not the same

Back

if (num1 != num2 ):

Answer explanation

This correctly tests if num1 is not equal to num2

Front

To test if x is greater than or equal to y: if (x ___ y):

Back

>=

Answer explanation

This would be used to check if x is greater than or equal to y

Front

What is output?
x = 8 % 2
if (x > 10):
print(1)
elif (x > 5):
print(2)
elif (x > 1 ):
print(3)
else:
print(4)
Options: 1, 2, 3, 4

Back

4

Answer explanation

(8 % 2) = 0 and 0 is not larger than 10, 5, or 1 so the else case will run

Front

What is output?
x = 10
if (x > 10):
print(1)
elif (x < 10):
print(2)
elif (x >= 10):
print(3)
else:
print(4)
Options: 1, 2, 3, 4

Back

3

Answer explanation

10 is greater than or equal to 10, so 3 will be the output

Front

What best defines an algorithm?

Back

A set of precise steps used to perform a task, typically on a computer

Answer explanation

A set of precise steps used to perform a task, typically on a computer → This is the most comprehensive definition of an algorithm.