Magnetism
Which materials are magnetic?
A. Copper, gold
B. Iron, nickel
C. Wood, plastic
D. Glass, aluminum
B. Iron, nickel ✔
Which of these is a real-world use of an electromagnet?
A. Refrigerator door
B. Car headlight
C. MRI scanner
D. Mirror
C. MRI scanner ✔
What is static electricity?
A. A build-up of electric charge on a surface
B. Electricity created by movement
C. Electricity that moves in a wire
D. Electricity used in cars
A. A build-up of electric charge on a surface ✔
What body part can static charge been easily seen in?
A. Nails
B. Hair
C. Eyes
D. Neck
B. Hair
What are the three main sub-atomic particles?
A. Atoms, ions, electrons
B. Neutrons, electrons, protons
C. Quarks, atoms, electrons
D. Cells, protons, neutrons
B. Neutrons, electrons, protons ✔
What are the two poles of a magnet called?
A. Left and right
B. Positive and negative
C. North and South
D. Top and bottom
C. North and South ✔
What is an electromagnet?
A. A magnet found in nature
B. A magnet made from plastic
C. A magnet created by electricity
D. A magnet that only works underwater
C. A magnet created by electricity
Which particles move to create static electricity?
A. Protons
B. Neutrons
C. Electrons
D. Atoms
C. Electrons ✔
What is the charge of an electron?
A. Positive
B. Negative
C. Neutral
D. No charge
B. Negative ✔
What charge does a proton carry?
A. Negative
B. Neutral
C. Positive
D. No charge
C. Positive ✔
Which force do two like poles of a magnet experience?
A. Attraction
B. Gravity
C. Neutral
D. Repulsion
D. Repulsion
In an experiment, an electromagnet picks up fewer paper clips. What might have happened?
A. More coils were added
B. A stronger battery was used
C. The current was increased
D. The wire was partially disconnected
D. The wire was partially disconnected ✔
What happens when two objects rub together and build static charge?
A. They become magnetic
B. Electrons are transferred
C. They exchange protons
D. They become heavier
B. Electrons are transferred ✔
Why is metal a poor material for holding static charge?
A. It reflects charge
B. It is too dense
C. It is a conductor
D. It is magnetic
C. It is a conductor ✔
What is the overall charge of a neutral atom?
A.+ 1
B. - 1
C. +2
D. 0
D. 0
Which of these would be attracted to a magnet?
A. Aluminium foil
B. A plastic ruler
C. Arubber band
D. A steel paperclip
D. A steel paperclip
How can you increase the strength of an electromagnet?
A. Add more batteries
B.Use a longer wire
C. Use thinner wire
D. Decrease the number of coils
A. Add more batteries ✔
Which object is most likely to build static charge?
A. Wet sponge
B. Plastic ruler
C. Glass of water
D. Metal spoon
B. Plastic ruler ✔
In which condition is static electricity more noticeable?
A. Hot and humid
B. Cold and dry
C. Wet and windy
D. Warm and sunny
B. Cold and dry ✔
Which particle is the lightest?
A. Electron
B. Proton
C. Neutron
D. Nucleus
A. Electron
What happens when a magnet is broken in half?
A. Only one pole remains
B. It becomes non-magnetic
C. Each half becomes a new magnet
D. The magnet loses all strength
C. Each half becomes a new magnet ✔
Which setup will make the strongest electromagnet?
A. Few coils, low current
B. Many coils, low current
C. Few coils, high current
D. Many coils, high current
D. Many coils, high current ✔
If a balloon sticks to a wall after being rubbed on hair, what is the cause?
A. Gravity
B. Magnetism
C. Static attraction
D. Air pressure
C. Static attraction ✔
Why does lightning occur during a thunderstorm?
A. Clouds heat up and expand
B. Air pressure drops rapidly
C. Wind causes friction with trees
D. Static charge builds up and discharges between the cloud and the ground
D. Static charge builds up and discharges between the cloud and the ground
What is the nucleus made of?
A. Electrons and ions
B. Only neutrons
C. Protons and neutrons
D. Atoms
C. Protons and neutrons ✔
What device uses the Earth’s magnetic field for navigation?
A. Compass
B. Speedometer
C. Telescope
D. Thermometer
A. Compass
If the current in an electromagnet is reversed, what happens to the poles?
A. They disappear
B. They switch places
C. They melt
D. They remain the same
B. They switch places ✔
What kind of charges attract each other?
A. Same charges
B. Positive to positive
C. Negative to negative
D. Opposite charges
D. Opposite charges ✔
Why does a charged balloon make hair stand up?
A. Like charges repel, lifting the hair
B. It becomes magnetic
C. The balloon heats the hair
D. The balloon pulls the hair with gravity
A. Like charges repel, lifting the hair
Where are electrons found in an atom?
A. In the nucleus
B. In the electron shells
C. In protons
D. In the atomic core
B. In the electron shells ✔