الأربعاء، 19 يناير 2011

light and shadows


Light and shadows

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1. When is a shadow formed? 
When the light is turned off
When the path of light is blocked by an object
When an object falls to the floor
2. When an object blocks the path of light, what is formed? 
A shadow
A reflection
A fog
3. When an object moves closer to a light source, its shadow... 
gets bigger
gets smaller
stays the same size
4. Which will make the darkest shadow? Light shining on a... 
sheet of thin tissue paper
glass window
wooden chopping board
5. Materials that light can pass through are called... 
transparent
translucent
opaque
6. Materials through which light cannot pass are called... 
transparent
translucent
opaque
7. Where would be a shady place to stand on a sunny day? 
In the sea
Under a tree
In the middle of a football pitch
8. Why do shadows made by the Sun move over the course of a day? 
Because the weather changes
Because someone moves the objects
Because the Sun appears to move across the sky each day
9. When the Sun is behind you, your shadow is... 
behind you
above you
in front of you
10. Shadows made by the Sun are shortest... 
in the morning, when the Sun is rising
at midday, when the Sun is directly overhead
in the evening, when the Sun is setting

light and shadow

how we see things


How we see things

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1. When light bounces back off a surface, we say it has been ... 
reflected
absorbed
bent
2. What types of surfaces reflect light well? 
Light coloured and smooth
Dull and dark
Dark coloured and smooth
3. Which of these objects would reflect the most light? 
A rusty metal key
A wooden spoon
A polished metal knife
4. How do mirrors work? 
By reflecting the light that hits them
By absorbing the light that hits them
By letting through the light that hits them
5. Why do scissors look shiny? 
Because they are sharp
Because they reflect light
Because they give out light
6. To make a wall reflect as much light as possible, you should paint it ... 
black
white
yellow
7. How are shadows formed? 
By light passing through an object
By light reflecting from a shiny object
By an opaque object blocking the path of light
8. How do we see a tree? 
By light reflecting off the tree and entering our eyes
By light travelling from our eyes and reflecting off the tree
By light reflecting off our eyes and entering the tree
9. Which of these is FALSE? 
Light travels in straight lines
Light travels very fast
Light can pass through any material
10. A beam of light hitting a mirror at an angle is reflected off at ... 
a smaller angle
the same angle
a larger angle

haw we see thing

physical and chemical change


Different changes

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1. Which substance can dissolve completely in water? 
Sand
Flour
Salt
2. Substances that dissolve in water are called 
solutions
insoluble
soluble
3. How could you separate a mixture of sand and salt? 
Mix with water, filter, and then evaporate
Mix with water, evaporate and then filter
Filter and then mix with water
4. Will the steam from seawater be salty? 
Yes
No
Some of the steam will be salty
5. Are melting, freezing, boiling, evaporating and condensing ALWAYS reversible changes? 
No
Yes
Only sometimes
6. Which of these is a reversible change? 
Metal rusting
Baking a cake
Freezing orange juice to make an ice lolly
7. Which of these is an irreversible change? 
Candle wax melting
Candle wax burning
Ice cream melting
8. What new materials are formed when a candle burns? 
Melted wax
Water and carbon dioxide and soot
No new materials are formed
9. How could you change burnt paper back into its original form? 
Cool it
Scrape off the soot
You can't
10. Which of these statements is FALSE? 
Freezing is not a reversible change
Heating a substance can cause both reversible and irreversible changes
Dissolving is a reversible change

physical and chemical change

the quze of the week


Plants and animals

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1. Which of these things are you NOT likely to find in a park or garden? 
An earthworm
An oak tree
A crab
2. Which of these animals is most likely to live in a pond? 
A water spider
A caterpillar
An ant
3. Which of these is most likely to grow in woodland? 
Algae
An oak tree
A cactus
4. A habitat is 
an animal behaviour
a shop where animals go to buy things for their homes
a place where animals and plants live
5. Which collection of animals might you find in a seashore habitat? 
Zebras, lions and elephants
Owls, caterpillars, oak trees
Barnacles, seagulls, crabs
6. A frog is adapted to its pond habitat by 
being brightly coloured
having webbed feet
growing into an adult frog
7. Why does a heron have a long sharp beak? 
To catch fish
To look cool
To fly faster
8. Why do African elephants have big ears? 
To keep cool
To hear better
To fly
9. Where would you expect to find a woodlouse? 
In a hot, sunny place
In a dark, damp place
In a dark, dry place
10. Which habitat does a rabbit live in? 
Desert
Meadow
River

life of the plants



Life cycle of a flowering plant

These are the main parts of a flower.
Illustration of a flower with parts labeled
Flowering plants go through the following life cycle.
Illustrations showing the life cycle of flowering plant: seed in the ground> young plant>  adult plant with flowers

How seeds are made

  1. Pollen is carried by insects or blown by the wind from one flower to another. This process is called pollination.
  2. Pollen reaches the carpel of the new flower, where it fertilises egg cells in the ovary to make seeds. This process is called fertilisation.
  3. The seeds are scattered by animals or the wind. This process is calleddispersal. Some of the seeds will grow into new plants.

plants and animals

the parts of flowers