Lesson 4 Quiz: Variables: Storing Things

1. What is a variable?

A. A name that holds a value you can reuse later. B. A number that changes every time you run the program. C. A file that stores your whole program. D. A word that Python always prints.

2. What does `age = 9` store, and how is it different from `age = "9"`?

A. The text `"9"`; `"9"` stores the number 9 instead. B. Both store the number 9 — the quotes make no difference. C. The number 9; `"9"` stores text, which cannot be used in arithmetic the same way. D. The number 9; `"9"` stores a bigger number.

3. What does `score = score + 5` do, step by step?

A. It creates a second variable called `score + 5`. B. It prints `score` and then adds 5 to the screen. C. It checks whether `score` is equal to 5. D. It reads the current value of `score`, adds 5, and stores the result back in `score`.

4. Which of these names are NOT allowed, and why: `my_score`, `2score`, `my score`?

A. Only `my_score` — because it contains an underscore. B. Both `2score` and `my score` — `2score` starts with a number, and `my score` contains a space. C. Only `my score` — because it contains a space. D. None of them — all three names are allowed.

5. What is the difference between `print(name)` and `print("name")`?

A. The first prints the value stored under the name; the second prints the word itself. B. The first prints the word itself; the second prints the value stored under the name. C. Both print the value stored under the name. D. Both print the word itself.