Choose the correct alternative.

1. Which of the following metals can be combined to produce electricity?

copper and copper
zinc and zinc
aluminium and aluminium
iron and iron
zinc and copper

2. Which of the following cannot be used as a conductor in a battery?

a potato
a lemon
salt water
a cucumber
rye bread

3. Which of the following elements is used in photoelectric cells?

gold
silicon
silver
platinum
phosphorous

4. What is the chemical sign of zinc?

Au
Cu
Zn
Ag
Hg

5. What is the chemical sign of silicon?

Pi
Si
Au
Ag
Hg

6. Which of the following devices is used to convert movement energy into electricity?

electric motor
photoelectric cell
helicopter
generator
accumulator

7. Which of the following methods cannot be used to power a generator?

wind
water flow
the pressure of water vapor
your hands
electricity

8. How many electrical pairs are contained in a three volt battery?

1
2
3
4
5

9. What rotates the rotor of a nuclear power plant?

flowing water
the pressure of water wapor
wind
electricity
light

10. How is water set to boil in a nuclear power plant?

by burning coal
by burning atoms
by burning oil
by burning peat
by dividing atoms