What type of matirial can become staticly charged?
An insulator
A non conducter
A conductor
A non insulator
An insulator or conductor
What is transferred from one object to another when one becomes static?
Protons
Neutrons
Electons
Protons, Neutrons and electrons
What charge are electrons?
Positive
Negitive
Neutral
How can you discharge static electricity?
Earthing it
Grounding it
Flooring it
Two objects with the same charge will...
repel each other
attract each other
The atoms or molecules that become charged are called...
ions
opposites
static
Why is a plane earthed when it is refuelled?
So the static electricity does not spark near the flammable liquid
So it doesn't blow away
So the static electricity cant shock anyone in the plane
What is resistance measured in?
ohms
ounces
volts
How do you work out resistance?
Voltage / Current
Current / Voltage
Current * Voltage
Current / Amps
What colour is the live wire?
Blue
Brown
Yellow and green
What colour is the neutral wire?
What colour is the earth wire?
Why do electrical devices have fuses?
So the device is protected from a power surge
So the device doesn't work too hard
So you can turn the device off easly
Why do metal devices have earth wires?
So that if there is an electrical fault and the outer casing becomes charged it will earth through the earth wire and not through someone touching it
To get power
To make the fuse work
What is the symbol for a double insulated device?
A square inside another square
A triangle inside another triangle
A circle inside another circle
A hexagon inside another hexagon
Ultrasound has a frequency of more than how many hertz?
20000
10000
15000
which type of nuclear radiation is a wave?
Alpha
Beta
Gamma
An atom that has lost an electron has a ______ charge?
positive
neutral
negative
What is half life?
The time it takes for a radioactive source to decay
The time it takes for half a radioactive source to decay
Half the time a radioactive source takes to kill someone
What material will stop gamma radiation?
Paper
Aliminium
Lead
Which one of these is a way of using gamma in hospitals?
To sterilise objects
To remove a kidney stone
To scan an unborn baby
Splitting an atom is...
Fussion
Fission
Fession
How does radioactivity change over time?
It increases
It decreases
It stays the same
