Grade 4 · Science · Unit 3 of 6
Light
Sources, shadows, reflection and refraction
What your child practises
Natural and artificial light, things that make light and things that reflect it, shadows, transparent, translucent and opaque materials, mirrors, refraction, and how light technology affects people and wildlife.
Saskatchewan Curriculum outcome: LI4.1–LI4.3 · sources of light, how light interacts with materials, and light technologies
Sample questions
A taste of this unit. In the app, questions change every time and get easier or harder to match your child.
Question 1
What colour of clothing would keep you coolest in the sun?
👕- black
- dark brown
- white
- dark blue
Show answer
white
Hint: White reflects most of the light.
Question 2
Which surface reflected the most light?
Temperature after 10 minutes in the Sun (°C) - black paper
- white paper
- foil
Show answer
foil
Hint: It stayed the coolest.
Question 3
Which surface absorbed the most light energy?
Temperature after 10 minutes in the Sun (°C) - black paper
- white paper
- foil
Show answer
black paper
Hint: It got the warmest.
Question 4
Frosted glass lets light through but you can't see clearly. It is…
🪟- reflective
- transparent
- opaque
- translucent
Show answer
translucent
Hint: Translucent materials scatter light.
Question 5
Too many outdoor lights at night can confuse…
🐦- worms
- polar bears
- fish in deep oceans
- migrating birds
Show answer
migrating birds
Hint: Some cities turn off lights during bird migration.
Question 6
A black T-shirt gets hotter in the sun than a white one. Why?
👕- white absorbs more light
- black reflects more light
- black makes light
- black absorbs more light energy
Show answer
black absorbs more light energy
Hint: Dark colours absorb more light.