A Level Computer Science

Which of the following is Nyquist's Theorem?

• e = mc²

• file size = sample res * sample rate

• f_s > 2f_max

This is an example of what?

• Sequence

• Selection

• Iteration

• Declaration

Abstraction is the act of...

• Adding extra detail to enable someone else to be able to solve the task without your help

• Removing the detail that is important to solve the task

• Removing all unnecessary detail to focus on what is important to solve the task

• Creating an image that is similar to the object in question in some abstract way

Which of the following command words would be used to create 'count controlled' iteration?

• continue

• repeat

• while

• for

Which of the following is variable declaration?

• myVariable = "Hello"

• "Hello" = myVariable

• int myVariable

• string = "Hello"

Why would you use a named constant?

• To ensure that the value cannot be changed by the program

• To ensure that the value is always there throughout the program

• To enable the programmer to know what the value is at any time

• To allow the programmer to only need to make a change one place

Which if the following command words allows the use of 'indefinite iteration'?

• repeat

• while

• for

• if

Which data type should be used to hold "Hello World"?

• real

• string

• integer

• boolean

When would you use 'indefinite iteration'?

• When you are unsure about how many times a loop will need to run to satisfy a condition

• When you know exactly how many times you need to run the loop in the algorithm

• When you want a different piece of code to run depending upon the value of a variable or condition

What does the code above demonstrate?

• Nested iteration

• Nested selection

• Condition-controlled iteration

• Count-controlled iteration