Numbas demo: quantities with units

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Christian Lawson-Perfect

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From users who are members of Demos :

Christian Lawson-Perfect

said

Ready to use

3 years, 3 months ago

From users who are not members of Demos :

Jesse Hoobergs

said

Doesn't work

3 years, 3 months ago

History

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Christian Lawson-Perfect 3 years, 3 months ago

Gave some feedback: Ready to use

○

Jesse Hoobergs 3 years, 3 months ago

Gave some feedback: Doesn't work

○

Christian Lawson-Perfect 4 years, 8 months ago

Published this.

○

Christian Lawson-Perfect 4 years, 8 months ago

Gave some feedback: Ready to use

○

Christian Lawson-Perfect 4 years, 8 months ago

Created this as a copy of Calculate concentration of solution.

Name	Status	Author	Last Modified
Calculate concentration of solution	Ready to use	Christian Lawson-Perfect	08/07/2020 20:03
Numbas demo: quantities with units	Ready to use	Christian Lawson-Perfect	02/12/2021 15:50

There are 8 other versions that do you not have access to.

Question statement

The 'quantities with units' extension adds tools to work with measurements. You can do arithmetic on quantities with associated units, and there's a custom part type which asks the student to enter a quantity along with its units.

See this question on the public editor.

Give any introductory information the student needs.

			Name	Type	Generated Value

width	quantity	quantity(30, "cm")
height	quantity	quantity(30, "cm")
length	quantity	quantity(40, "cm")
weight	quantity	quantity(5.4, "kg")
density	quantity	quantity(150, "kg/m^3")

Automatically regenerate variables?

Name

Data type

Value

xxxxxxxxxx
 
qty(random(30..80#10),"cm")

JME function reference

Description

Describe what this variable represents, and list any assumptions made about its value.

Can an exam override the value of this variable?

Generated value: `quantity`

quantity(30, "cm")

→ Used by:

weight

"Randomised answers" - prompt

Parts

A quantity with associated units Quantity with units
Require exactly the same units Quantity with units
Prevent submission of a unitless answer Quantity with units
Randomised answers Quantity with units

Quantity with units

Ask the student a question, and give any hints about how they should answer this part.

Write 1kg. Any compatible unit is also acceptable.

Try 1kg, 1000g.

Help with this part type

Marks

Show correct answer on reveal?

Show score feedback icon?

Correct answer

xxxxxxxxxx
 
qty(1,"kg")

The expected quantity.

Input hint

Allow unitless answer?

If not ticked, the student is prevented from submitting an answer without specifying units.

What to do if incompatible units used

If the student's answer is given in units incompatible with the correct answer's units:

"Prevent submission": Prevent the student from submitting until they use compatible units
"Mark as incorrect": Mark the student's answer as incorrect.
"Mark as if correct units used": Mark the student's answer as if they used the correct units, and apply the "different units used" penalty.

What to do if different units used

If the student's answer is given in different units to the expected answer:

"Convert" - silently convert the student's answer to the units used in the correct answer.
"Warn and convert" - show a warning to the student, but convert.
"Prevent submission" - don't allow the student to submit, and show a warning that they must use the same units.
"Mark incorrect" - the student's answer is marked as incorrect.

Penalty if different units used

100%

This penalty is applied if the student gives their answer in different units to the expected answer. The selected percentage of the student's score is taken away.

Margin of error

$10^{ -12 }$

The student's answer is marked correct if the difference between it and the correct answer is at most this value, measured in the same units as the correct answer.

Advice

Give a worked solution to the whole question.

Use this tab to check that this question works as expected.

There was an error which means the tests can't run:

Part	Test	Passed?
Quantity with units
Quantity with units		Hasn't run yet
Quantity with units
Quantity with units		Hasn't run yet
Quantity with units
Quantity with units		Hasn't run yet
Quantity with units
Quantity with units		Hasn't run yet

This question is used in the following exams:

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Metadata

Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

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Feedback

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Checkpoint description

Christian Lawson-Perfect 3 years, 3 months ago

Jesse Hoobergs 3 years, 3 months ago

Christian Lawson-Perfect 4 years, 8 months ago

Christian Lawson-Perfect 4 years, 8 months ago

Christian Lawson-Perfect 4 years, 8 months ago

Error in variable testing condition

Error

Warning

Generated value: `quantity`

Parts

Quantity with units

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Error

Numbas demo: quantities with units

Metadata

Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

Contributors

Feedback

History

Comment

Checkpoint description

Christian Lawson-Perfect 3 years, 3 months ago

Jesse Hoobergs 3 years, 3 months ago

Christian Lawson-Perfect 4 years, 8 months ago

Christian Lawson-Perfect 4 years, 8 months ago

Christian Lawson-Perfect 4 years, 8 months ago

Error in variable testing condition

Error

Warning

Generated value: quantity

Parts

Quantity with units

Generated value: `quantity`