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PHYSICS MCQs

Total Questions : 3767 | Page 39 of 377 pages
Question 381. Full form of CFL used in place of electric bulbs is
  1.    Compact fluorescent lamp
  2.    Constantan filament lamp
  3.    Closed filament lamp
  4.    Closed fluorescent lamp
 Discuss Question
Answer: Option A. -> Compact fluorescent lamp
Question 382. The filament of electric bulb is made up of :
  1.    Copper
  2.    Nichrome
  3.    Lead
  4.    Tungsten
 Discuss Question
Answer: Option D. -> Tungsten
Question 383. Two electric bulbs marked 25W – 220V and 100W – 220V are connected in series to a 440Vsupply. Which of the bulbs will fuse?
  1.    25 W
  2.    Both
  3.    100 W
  4.    Neither
 Discuss Question
Answer: Option A. -> 25 W
Question 384. 1 WH =
  1.    360 joules
  2.    36000 joules
  3.    3600 joules
  4.    36 joules
 Discuss Question
Answer: Option C. -> 3600 joules
Question 385. The electrical domestic tube light gives white fluorescent light because of
  1.    Colision between molecules of filled gas under electric current
  2.    Heavy current
  3.    Vacuum inside the tube
  4.    Falling of ultra violet rays on the white inner coating of the tube
 Discuss Question
Answer: Option D. -> Falling of ultra violet rays on the white inner coating of the tube
Question 386. The unit for measuring electric power is the
  1.    Steridian
  2.    Watts
  3.    Watts
  4.    Volts
 Discuss Question
Answer: Option C. -> Watts
Question 387. The device used to change the speed of an electric fan is
  1.    Amplifier
  2.    Regulator
  3.    Switch
  4.    Rectifier
 Discuss Question
Answer: Option B. -> Regulator
Question 388. The material used in electric heater is
  1.    Tungsten
  2.    Nichrome
  3.    Brass
  4.    Steel
 Discuss Question
Answer: Option B. -> Nichrome
Question 389. After long periods of use, a grey spot develops on the inside of a bulb. This is because
  1.    The tungsten filament evaporates and collects there
  2.    The heat of the bulb scorches the glass at the top
  3.    Dust inside the bulb condenses on the top
  4.    Glass undergoes a change due to the heat
 Discuss Question
Answer: Option C. -> Dust inside the bulb condenses on the top
Question 390. The coil wire in the electric room heater or electric cooking heater is called ________
  1.    Circuit
  2.    Element
  3.    Filament
  4.    Cells
 Discuss Question
Answer: Option B. -> Element

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