1) Electroplating is used to coat less expensive metals with a. gold b. silver c. platinum d. valuable metals
|
||||
2) Semiconductors are also found in a. light emitting diodes b. liquid crystal displays c. cathode ray tubes d. cathode ray oscilloscopes
|
||||
3) Adding more bulbs to a circuit with one battery would a. make them brighter b. make them sharper c. make them dimmer d. make them colorless
|
||||
4) Nichrome (mixture of nickel and chromium) resists a. less electricity than copper b. less electricity than aluminum c. more electricity than copper d. more electricity than aluminum
|
||||
5) In parallel circuits, the voltage is a. equal b. unequal c. more powerful d. less powerful
|
||||
6) Friction can cause transfer of a. neutrons b. protons c. electrons d. photons
|
||||
7) A doorbell and electric bell use a. magnets b. current c. electromagnets d. resistors
|
||||
8) The negative electrode of the electrolytic cell is known as a. Cathode b. Anode c. Posit rode d. Nematode
|
||||
9) Overloading in power sockets can cause them to a. spark b. burst c. catch fire d. burn
|
||||
10) If a hair drier uses a current of 2A but we fit 1A fuse in it. The fuse will a. glow b. burst c. melt d. remain safe
|
||||
11) On track magnetic levitation trains a. clip b. float c. ride d. skid
|
||||
12) The electrons move from a. positive to negative terminal b. negative to positive terminal c. both a and b d. positive to positive terminal
|
||||
13) Materials that are insulators when cold and conductors when hot are known as a. semi insulators b. semi conductors c. semi electrolytes d. electrolytes
|
||||
14) Materials that do not allow electrons to flow through them are known as a. insulators b. conductors c. electrolytes d. bases
|
||||
15) Short circuit occurs when the current takes up a. more voltage b. less voltage c. short path d. long path
|
||||
16) To prevent overload and overheating of wires a. fuses are used b. circuit breakers are used c. fuses and circuit breakers are used d. fuses and resistor are used
|
||||
17) The magnetic field of the coil and the permanent magnet a. attract each other b. repel each other c. combine with each other d. stay with each other
|
||||
18) ELCB is an abbreviation of a. electrolytic circuit breaker b. earth locking circuit breaker c. earth leakage circuit breaker d. electric leakage circuit breaker
|
||||
19) Electricity is required to a. light up homes b. clean your car c. flush the toilet d. change weather
|
||||
20) A block of impure copper is used as a. cathode b. anode c. posit rode d. nematode
|