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- 1. Multiple ChoiceThe electric lamp converts the electric energy into…….kineticlightsoundmagnetic
- 2. Multiple ChoiceThe electric lamps represent aconstant source of light that is ……clearbrightfree from smoke and odorall the previous answers
- 3. Multiple ChoiceAll the following are from the components of the light bulb except…..the filamentthe glass bulbtwo points of connectionthe base of the light bulb
- 4. Multiple ChoiceThe filament of the light bulb is made of….tungestencopperironaluminum
- 5. Multiple ChoiceThe filament of the light bulb is made of tungsten because it has ….low densitylow melting pointhigh melting pointno conductivity
- 6. Multiple Choice…..allow the electric current to transfer from the lamp base to the filamentthe tungsten filamenttha argon gascopper and lead wires in the light bulbthe base of light bulb
- 7. Multiple ChoiceAll the following are from the components of the fluorescent lamp except…tungsten filamentspoints of connectiontwo thick copper wiresglass tube
- 8. Multiple ChoiceWhich of the following gases is found in the fluorescent lamp but not in the light bulb?NeonArgonMercury vapourwater vapour
- 9. Multiple ChoiceThe inner surface of the tube of the fluorescent lamp is covered with …mercurya phosphoric materialcoppertungsten
- 10. Multiple ChoiceThe glass tube of the fluorescent lamp contains….neon gasargon gasargon gas and a little of mercury vapourhydrogen gas
- 11. Multiple ChoiceWhen the electric lamp connected in parallel with others in the electric circuit, the light intensity…..decreasesincreasesdoesn't changedecreases sometimes and increases another times
- 12. Multiple ChoiceThere are two points of connection at each tip of the fluorescent lamp…..to react with tungsten filamentto connect the lamp with electricityto prevent air from reaching the filamentall the previous answers
- 13. Multiple ChoiceAll the following gases are used in electric lamps except…argonatmospheric airmercury vapourargon and mercury vapour
- 14. Multiple ChoiceWe need a light bulb, battery and connecting wires in a closed continuous path to…..obtan a continuous electric circuitmake a simple electric circuitmake the bulb lights upall the previous answers
- 15. Multiple ChoiceWhen we connect more than one bulb in series to an electric source, the light intensity of the bulbs…..decreasesincreasesdoes not changeall the previous answers
- 16. Multiple ChoiceWhen we connect more than one bulb in parallel to an electric source, the light intensity of the bulbs…..decreasesincreasesdoes not changeall the previous answers
- 17. Multiple Choiceif we have three light bulbs and we need to get high light intensity so we must connect them…in seriesin paralleltwo in series and one in parallelwithout copper wire
- 18. Multiple ChoiceWhen we unscrew a bulb from those that are connected in series , …….the unscrewed lamp only will be turned offno lamp will be turned offall lamps will be turned offone lamp only will be turned off
- 19. Multiple ChoiceWhen an electric lamp which is connected in series with the other lamps burns out,….the light intensity decreasesthe light intensity increasesall lamps turn offthe light intensity not change
- 20. Multiple ChoiceIn houses,………..lamps and all other electric machines are connected in parallellamps are connected in parallel and all other electric machines are connected in serieslamps are connected in series and all other electric machines are connected in parallellamps and all other electric machines are connected in series
- 21. Multiple ChoiceIn the decorative lights, if one or more lamps burn out the other lamps do not turn off, because………lamps are used in religious celebrationslamps are connected in parallellamps are connected in seriesthere is no clouds in the sky
- 22. Multiple ChoiceThe light bulbs are connected in ……….in the houseparallelseriesparallel and seriesperpendicular
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