AP CSP Unit 1 Practice- Bits, Binary, ASCII, and Images

What's the word that "Binary digit" gets shortened to?

How many bits are in a byte?

• 1

• 2

• 4

• 8

Binary is a base-2 number system because there are only two digits used: 0 and 1. With one bit you can represent two different values. How any values can you represent with two bits?

• 2

• 3

• 4

• 8

In fact, there's a pattern for how many values you can represent with a certain number of bits. If you take 2 and raise it to the power of the number of bits, you get the number of values. Two bits can represent four values because 2²= 4. Three bits can represent 2³= 8 values. How many values can you represent with six bits? You can write your answer as a number (like 16) or as a number with an exponent (written like 4^2).

Each time you add an additional bit, what happens to the number of values that you can represent?

• It increases by 1

• It doubles

• It quadruples

• It gets multiplied by 10

When we count in binary, we start counting at zero, which is represented by 0000. Which of the following is also a way to represent zero?

• 0

• 01

• 10000

• 000.1

What is the highest number you can count to using only three bits? (your answer should be a single number)

In the decimal system, the place values (starting from the right) go: 1, 10, 100, 1000, and so on. In binary, how do the place values (starting from the right) go?

• 0, 2, 4, 8, etc.

• 1, 2, 4, 8, etc.

• 0, 1, 2, 4, etc.

• 1, 4, 16, 32, etc.

The four-bit binary number for 1 is 0001. What is the four-bit binary number for 6?

What is the decimal number represented by the binary number 1111?