Sound is made when objects __________.
vibrate
The image is showing two: a) sound creators; b) tuning forks; c) sound forks.
tuning forks
Sound travels fastest through: gas; liquid; solid
solid
You can hear no sound in _____________.
a vacuum / space.
Light travels in straight lines only. True or False?
True.
What is a luminous object?
It's an object that emits its own light.
Which is the biggest luminous object for all humans?
The sun
Is the moon a luminous object?
No
Light energy is a form of energy. Can you mention 3 more forms of energy?
Kinetic energy, sound energy and heat energy.
A food processor converts electrical energy into __________ (mention 2).
Sound energy and kinetic energy.
A television converts electrical energy into ___________ (mention 3).
Light energy, heat energy and sound energy.
Look carefully at the picture. The bulb is in the _____________________.
bulb holder
For an electric torch to switch on, it needs: a bulb, a switch, wires and a __________.
battery
Cobalt, nickel, iron and _______________ are all magnetic.
steel
What is this kind of magnet called? (A horse-shoe magnet; a bar magnet; a ring magnet).
A horse-shoe magnet.
A magnet has a north pole and a south pole. What happens when we put the north pole side of a magnet close to the north pole side of another magnet?
They repel.
