Science 1st term

choose the correct answer:

A set is used  to change the mechanical energy in to electric energy

• dynamo

• Electromagnet

• Natural magnet

• Compass

choose the correct answer:

Which of the primary coloured lights are mixed to produce yellow colour ?

• Red and  green

• Blue and cyan

• Blue and green

Choose the correct answer

A tool used to separate the white light into seven spectrum colours

• Reflection

• The glass prism

• A compass

• Magnetic force

Choose the correct answer

The light bouncing from a plane mirror is known as ......

• Irregular reflection

• Regular refraction

• .

  Regular reflection

• Irregular refraction

True or False

We see the coloured transparent body with the same colour because it reflects all light colours.

• True

• False

True or False

Iron , cobalt and nickel are magnetic materials

• True

• False

complete

When light falls on an opaque body ........ Is formed

Give reasons

The magnet attracts nickel but doesn't attract Aluminium

Give reason

It's preferred to wear black clothes in winter?

Give reason:

Formation of images through narrow holed is due to ....