# Difference between revisions of "FQT Multiple choice placeholders"

In addition to the answer box placeholders, the Formulas question type provides for two other types of placeholder which are used for multiple choice questions:

• Dropdown menu placeholder
• Radio buttons placeholder

## Why make a FQT multiple choice question?

Because you can use all the power of the Formulas calculation engine to build the list of choices.

## Dropdown menu placeholder

The syntax for this placeholder is {_n:choices:MCE} where _n is the placeholder name (_0, _1, _2, etc.) as for the answer box placeholders, choices is a list of strings to appear as the menu choices and MCE must appear as is.

Example

Use a dropdown menu placeholder to make a multiple choice question.

```General
Question name*       A formulas question with a dropdown menu multiple choice question
Variables
Global variables     cities=["Calgary","Halifax","Montréal","Ottawa","Toronto","Vancouver"];
Main question
Question text*       Geography
{#1}
Part 1
Part's mark*         1
Grading criteria*    Absolute error == 0
Placeholder name     #1
Part's text          What is the capital city of Canada?
{_0:cities:MCE}
```

The formulas question should look like this (the choices are highlighted by moving up and down in the menu):

## Radio buttons placeholder

The syntax for this placeholder is {_n:choices} where _n is the placeholder name (_0, _1, _2, etc.) as for the answer box placeholders and choices is a list of strings to appear as the menu choices. The list of buttons is only vertical.

Example

Use a radio buttons placeholder to make a multiple choice question.

```General
Question name*       A formulas question with a radio buttons multiple choice question
Variables
Global variables     planets=["Earth","Jupiter","Mars","Mercury","Neptune","Saturn","Uranus","Venus"];
Main question
Question text*       Astronomy
{#1}
Part 1
Part's mark*         1
Grading criteria*    Absolute error == 0
Placeholder name     #1
Part's text          What is the closest planet to the sun?
{_0:planets}
```

The formulas question should look like this (the student must click a choice from the list):

## Shuffled choices

With Formulas multiple choice questions, the shuffling of choices is not a built-in option but it can be easily programmed.

Example

Make a Formulas multiple choice question with shuffled choices.

Downloadable question file: ShuffledMultipleChoice.xml. Programming comments are given in this file.

```General
Question name*       ShuffledMultipleChoice
Variables
Random variables     c=shuffle([0,1,2,3,4,5]);
Global variables     mc=[" Red"," Orange"," Yellow"," Green"," Blue"," Violet"];
a=3;  # The third answer (counting from 0), i.e. Green, is the correct answer.
c=c;
t=c;
for (i:[0:6]) {
t[i]=a==c[i]?i:0;
}
tt=0;
for (i:[0:6]) {
tt=tt+t[i];
}
colors=[mc[c[0]],mc[c[1]],mc[c[2]],mc[c[3]],mc[c[4]],mc[c[5]]];
Main question
Question text*       Physics
{#1}
Part 1
Part's mark*         1
Grading criteria*    Absolute error == 0
Placeholder name     #1
Part's text          What pure spectral color has an approximate wavelength of 530 nm (measured in air or vacuum)?
{_0:colors}
```

The formulas question should look as shown below. The choices are shuffled hence in a different order for each student (there are 6! = 720 permutations):

When shuffled choices are required, it is probably easier in general to use Moodle's core Multiple choice question. The point here is that with the Formulas question, multiple choice questions can be programmed.