Worksheetsconductors and insulators
Total questions: 13
Worksheet time: 7mins
1. Metals are good conductors of electricity because:
In metals there are many free nuclei
In metals there are many free atoms.
In metals there are many free electrons.
In metals there are many nuclei, atoms and free electrons.
2. In metals, free electrons are electrons
revolve around the nucleus.
can move from one position to another
escape from the atom and move freely in the metal
directional movement
Lightning is caused by electrical charges moving very quickly through the air. In this case the air there
generate an electric current
glow
become a conductive material
heated up
Conductors are substances:
capable of passing current
capable of allowing positively charged particles to pass through
capable of allowing negatively charged particles to pass through
Sentences A, B, and C are all correct.
Which of the following objects is an insulator?
Glass, rubber, wood
Iron, copper, aluminum
Salt water, lemon juice
Gold and silver
Choose the sentence that arranges the substances according to their increasing ability of good electrical insulators
Air, plastic, porcelain
Distilled water, glass, plastic
Rubber, dry wood, porcelain
Air, glass, plastic
Which of the following materials is an insulator?
Wood
Copper
Iron
Aluminum
Choose the correct answer
When doing electrical repairs in the house, Poles often stand on wooden or plastic chairs. Do so to:
No contact with the ground
Avoid electric shock
Do not allow electric current to pass through people
All three sentences are correct
Choose the correct explanation Why are electric wire cores usually made of copper?
Because copper is easy to spin, malleable and malleable
Because copper conducts electricity well
Because copper is a fairly common material, the price is not too expensive compared to other good conductive materials
Both the a, b, c are correct
Choose the sentence that arranges substances according to their increasing ability to conduct electricity
Common water, copper, mercury
Common water, graphite, gold
Mercury, salt solutions, iron
Silver, acidic solutions, graphite
Choose the correct explanation People use plastic wires to wrap copper cores in electrical wires to:
Insulation
Conductive
Protect the copper core from breaking
Both A and C are correct
The following materials are commonly used as electrical insulators
Porcelain, metal, plastic, rubber
Paint, wood, lead, cast iron, earthenware
Coal, wood, copper, zinc, nylon
Plastic, nylon, porcelain, rubber
Which of the following is the best conductor of electricity?
Distilled water
Atmosphere
Lead
Yellow
