Question

1. Electric current is the flow of
a. Proton
b. Electron
c. Neutron
d. Positron
2. A device which prevents or allow the current to flow through it
a. Motor
b. Conductor
c. Switch
d. Terminal
3. SI unit of speed is
(a) km/h (b) m/s
(c) km/s
(d) m/h
4. Which one is filled in the bulb of a thermometer?
(a) Mercury
(b) Lead
(c) Copper
(d) Silver​

Answer 1

Answer:

electron ,conductor, km/h,mercury