Lesson 9 Quiz: If Statements: Making Decisions

1. What does an `if` statement do?

A. It runs code only when its condition is true, and skips it otherwise. B. It runs code twice, whatever its condition is. C. It stops the program when its condition is true. D. It prints its condition, true or false.

2. What two things mark the code that belongs to an `if`?

A. A semicolon at the end of the `if` line, and square brackets around the lines below. B. A comma at the end of the `if` line, and a blank line after it. C. Parentheses around the `if` line, and a comment on the lines below. D. A colon at the end of the `if` line, and indentation on the lines below.

3. What does `else` mean, and does it take a condition?

A. "In the first case" — it takes a condition of its own. B. "In every other case" — it takes no condition of its own. C. "In every other case" — it takes the same condition as the `if`. D. "Stop here" — it takes no condition of its own.

4. In an `if`/`elif`/`else` chain, how many blocks run?

A. All of them, in order from top to bottom. B. Two: the first true block and the `else`. C. At most one: the first block whose condition is true (or the `else`, if none is). D. None — the chain only checks conditions, it never runs a block.

5. Why does indentation matter in Python in a way it does not in most other languages?

A. Because indentation is how Python decides which lines belong to an `if`, `elif`, or `else`. B. Because Python runs faster when the code is indented. C. Because indentation adds comments to the program. D. Because other languages require indentation too, and Python copies them.