Choose the correct alternative. Remember to save your answers.

1. What kind of a resistor can be used to produce light?
an electric motor
an incandescent light bulb
an electromagnet

2. Which of the following is a source of electric tension?
a lamp
a battery

3. Which of the following materials conducts electricity the best?
plastic
wood
metal
glass

4. How many poles do the parts of an electric circuit need to have?
zero
one
two
three

5. When an electric circuit is closed,
there are not enough poles
there are enough poles
electricity can run through it.
electricity cannot run through it.

6. When an electric circuit is open,
there is enough insulation.
there are enough poles.
electricity can run through it.
electricity cannot run through it.

7. Which of the following materials is a good electric insulant?
copper
gold
plastic

8. Which of the following is a source of electric tension?
a separator
a generator
a curator

9. Which of the following devices uses a small electric circuit?
a snowmobile
a motorbike
a laptop
a microwave oven

10. Which of the following combinations of metals produces electricity?
copper and copper
zinc and zinc
iron and iron
zinc and copper

11. Which of the following can not be used as an electric conductor in a battery?
potato
lemon
salt water
bread

12. What is the chemical sign of zinc?
Au
Cu
Zn
Ag
Hg

13. What is the chemical sign of silicon?
Pi
Si
Au
Ag

14. Which of the following devices converts movement energy into electricity?
an electric motor
a photoelectric cell
a generator
an accumulator

15. Which of the following methods cannot be used to move a generator's rotor?
water flow
pressure from water vapor
your hand
electricity

16. Which of the following methods is used to move the rotor of a nuclear power plant?
water flow
pressure from water vapor
wind
electricity

17. Which of the following sources of light does not use electricity?
LED lamp
fluorescent lamp
incandescent lamp
candle

18. Which of the following things produces light in an incandescent light bulb?
semiconductor
glass
gass
heat resistor

19. Which of the following things produces light in a fluorescent lamp?
semiconductor
fluorescent material
glass
gas

20. What is the advantage of LED lamp?
They are cheap.
They do not produce waste.
They are resistant to heat.
They last for a long time.

21. When does an electromagnet have a magnetic field?
Always.
Never.
When the circuit is closed.
When the circuit is open.

22. What is a coil?
a bolt of metal
a permanent magnet
a conductor bundle
a kind of battery

23. Which of the following instructions is wrong?
You should make sure that electronic devices do not come into contact with water.
If an electronic device catches fire, you should use water to extinguish it.
If an electronic device catches fire, you should use a fire blanket to extinguish it.