G4 challenge

The …………………. is the most important source of light on earth.

•     sun

• candle

• lamp

…………………… gives light as a result of chemical reactions inside its body.

• Dog

• Lion

• Firefly

.………………………….  is the transfer of heat that occurs when one thing touches another.

• Radiation.

• Conduction

• Convection.

1 When the oven is turned on in the kitchen the whole kitchen is warm because of the ……………

• Convection.

• Conduction

• Radiation.

……………………… light is a blend of colours.

• Orange.  

• White.  

• Black.

…………………….. is the bending of light when it passes into a new medium.

• absorption.

• reflection

• refraction

………………………. occurs when light rays bounce off.

• absorption.

• reflection

• refraction

The …………………….. occurs when an object takes in a light wave.

• absorption.

• reflection

• refraction

…………………………. Reflects light more than water.

• Carton.

• Glass

• Mirror

The wavelength of the red colour is ………………  the blue colour.

• shorter than.   

• longer than.

• equal to.