Year 3 Science Light and shadows: check-up and practice test questions

Method. Look at the labels in the picture.

1. Read the labels. Light must enter the eyes before we can see the cup, and that happens with lights on.
   lights on
2. Write the answer.
   lights on

Check. With lights off, no light enters the eyes. ✓

Method. Read the definition of dark.

1. Read the definition. Dark is the absence of light, so there is no light.
   no
2. Write the answer.
   no

Check. Dark is the same as having no light at all. ✓

Method. Read the table of things in section 8.2.

1. Read the table. The torch says yes in the column Makes its own light?
   torch
2. Write the answer.
   torch

Check. A book and a cup only reflect light. ✓

Method. Count the rows that say no.

1. Read the column. The book, the chair and the cup say no.
   three no
2. Write the answer.
   3

Check. The Sun, the torch and the lamp are light sources. ✓

Method. Read the surfaces in section 8.3.

1. Read the table. The mirror made a clear, bright spot. The black card made no spot.
   mirror
2. Write the answer.
   mirror

Check. A dark surface reflects very little light. ✓

Method. Read the key ideas in section 8.3.

1. Read the definition. Light bouncing off a surface is called reflection.
   reflection
2. Write the answer.
   reflection

Check. The light is reflected from the surface. ✓

Method. Read the table in section 8.4.

1. Read the table. Looking through binoculars is not safe, but wearing a hat with a brim is safe.
   hat
2. Write the answer.
   wear a hat with a brim

Check. Never look directly at the Sun. ✓

Method. Read the key ideas in section 8.5.

1. Read the key ideas. A shadow needs a light source, an opaque object to block the light, and a surface for the shadow to fall on.
   three
2. Write the answer.
   a light source, an opaque object and a surface

Check. Without the object, there is no shadow. ✓

Method. Find the row for 10 cm.

1. Read the row. When the torch is 10 cm from the card, the shadow is 12 cm high.
   12 cm
2. Write the answer.
   12

Check. The closer torch gives the bigger shadow. ✓

Method. Read the safety rule in section 8.4.

1. Read the rule. The Sun is very bright, and its light can damage the eyes.
   damage the eyes
2. Write the answer.
   Accept any sentence that says the Sun is very bright and its light can damage the eyes.

Check. We protect our eyes by looking away. ✓

Method. Think about the word for a place with no light.

1. Read the definition. Dark is the absence of light.
   dark
2. Write the answer.
   dark

Check. Dark is the same as having no light at all. ✓

Method. Think about whether a torch makes its own light.

1. Read the table in section 8.2. The torch makes its own light, so it is a light source.
   yes
2. Write the answer.
   yes

Check. A book and a cup are not light sources. ✓

Method. Find the top row of the picture.

1. Read the top row. The sun, the torch and the lamp are in the top row.
   top row
2. Write two. Two of them are the sun and the torch.
   sun and torch
3. Write the answer.
   Accept any two of: sun, torch, lamp.

Check. The top row shows the light sources. ✓

Method. Read the picture.

1. Read the picture. The light bounces off the mirror, which is called reflection.
   reflection
2. Write the answer.
   reflection

Check. Reflection is light bouncing off a surface. ✓

Method. Think about which surface reflects light clearly.

1. Think about the surfaces. A mirror is smooth and shiny, so it reflects light clearly.
   shiny
2. Write the answer.
   mirror

Check. A black card reflects very little light. ✓

Method. Read the safety actions in section 8.4.

1. Read the table. Looking away, wearing a hat with a brim, standing in the shade and wearing sunglasses that block UV light are safe.
   safe
2. Write two. Any two of these protect your eyes.
   two safe actions
3. Write the answer.
   Accept any two of: look away, wear a hat with a brim, stand in the shade, wear sunglasses that block UV light.

Check. Never look directly at the Sun. ✓

Method. Think about what binoculars do.

1. Think about the light. Binoculars make the Sun look bigger and brighter.
   brighter
2. Give the reason. So looking through them makes the Sun more dangerous to the eyes.
   more dangerous
3. Write the answer.
   No. Accept any reason that says the Sun is too bright and can damage your eyes.

Check. Never look directly at the Sun, even with binoculars. ✓

Method. Read the picture.

1. Read the picture. The dark shape on the wall is made when the card blocks the light.
   blocks the light
2. Write the answer.
   shadow

Check. A shadow is a dark shape made when an object blocks light. ✓

Method. Read the table of results.

1. Find the row for 40 cm. When the torch is 40 cm from the card, the shadow height is 6 cm.
   6 cm
2. Compare the results. The shadow heights go 12 cm, 8 cm and 6 cm, so they get smaller as the torch moves away.
   smaller
3. Write the answer.
   6 cm; smaller

Check. The shadow is smaller when the torch is further away. ✓

Method. Read the picture of the day.

1. Find the short shadow. The shadow is short at midday, and long in the morning and late afternoon.
   short at midday
2. Explain why. At midday the Sun is highest in the sky, so the shadow is short.
   highest
3. Write the answer.
   Midday. Accept any sentence that says the Sun is highest in the sky at midday, so the shadow is short.

Check. The Sun is low in the morning and late afternoon, so the shadows are long then. ✓