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Uses of Light and Sound in Technology — Free MYP2 Sciences Practice Questions
1QuestionApplications of Light in Everyday LifeConcept Practice
2 marks~3 minCriterion A
The diagram shows a flashlight with five labelled parts: Part A (bulb), Part B (reflector), Part C (lens), Part D (switch), and Part E (battery).
a
Identify the part that focuses light into a beam. [1]
b
Identify the part that supplies electrical energy to the flashlight. [1]
Solutions
2QuestionLight and Sound in Entertainment SystemsAssessment Practice
3 marks~5 minCriterion C
The graph below shows how the power consumption of a tablet display changes as the brightness setting increases from 0% to 100%. Power consumption rises slowly at first, then more steeply, then levels off near maximum brightness.
a
Identify the general trend shown in the graph. [1]
b
Explain why increasing the brightness setting causes the display to use more power. [1]
c
A student says: "Doubling the brightness setting always doubles the power consumption." Using the shape of the graph, explain whether the student is correct. [1]
Solutions
3QuestionApplications of Light in Everyday LifeAssessment Practice
6 marks~9 minCriterion B
A flashlight beam is aimed at a wall. The graph shows brightness (in lux, a unit of light intensity) measured at different distances from the wall.
Brightness (lux): 200 at 10 cm, 50 at 20 cm, 22 at 30 cm, 12 at 40 cm.
Brightness (lux): 200 at 10 cm, 50 at 20 cm, 22 at 30 cm, 12 at 40 cm.
a
Identify the brightness at 20 cm and at 40 cm from the graph. [1]
b
Calculate the percentage decrease in brightness from 20 cm to 40 cm. Show your working. [2]
c
Describe the relationship between distance and brightness shown by the data, and explain why this relationship occurs. [3]
Solutions
4QuestionApplications of Light in Everyday LifeAssessment Practice
6 marks~9 minCriterion D
A store uses infrared sensors (devices that detect heat) to open its doors automatically. The sensors respond to heat given off by people's bodies. The store manager notices the doors sometimes open when a car passes by or when direct sunlight hits the sensor.
a
Identify one advantage of using an infrared sensor instead of a push-button door. [1]
b
Explain why the sensor opens the doors even when no person is present. [2]
c
Compare the convenience of the infrared sensor with its reliability problems. Use examples from the scenario in your answer. [3]
Solutions
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