# Knowledge check

### Check your knowledge

**1. Under what conditions does a test expression that uses the `and` operator evaluate to `True`?**

* [x] A test expression that uses the `and` operator evaluates to `True` when both subexpressions are true.

{% hint style="info" %}
Correct! Both conditions in the test expression must be true for the entire test expression to evaluate to `true`.
{% endhint %}

* [ ] A test expression that uses the `and` operator evaluates to `True` when one subexpression is true and the other is false.
* [ ] A test expression that uses the `and` operator evaluates to `True` when both subexpressions are false.

**2. What is the keyword `elif` short for in Python?**

* [x] else if

{% hint style="info" %}
Correct! You can use the `elif` keyword to add multiple test expressions to your program.
{% endhint %}

* [ ] only if
* [ ] else

3\.  What values in a test expression are always interpreted as false?

* [ ] Any non-zero values
* [ ] Empty
* [x] None and 0

{% hint style="info" %}
Correct! None and 0 are interpreted as false in Python.
{% endhint %}


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