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PHYSICS MCQs

Total Questions : 3767 | Page 40 of 377 pages
Question 391. The composition of electrician solder is
  1.    Lead-37%, tin-63%
  2.    Iron-37%, tin-63%
  3.    Lead-37%, Steel-63%
  4.    Steel-37%, copper-63%
 Discuss Question
Answer: Option A. -> Lead-37%, tin-63%
Question 392. The purpose of choke in tube light is
  1.    Induce high voltage
  2.    Induce low resistance
  3.    Induce high resistance
  4.    Induce low voltage
 Discuss Question
Answer: Option A. -> Induce high voltage
Question 393. An electric iron of 750 W is used for S hours per day. Then the energy consumed in one day by the iron is:
  1.    6 units
  2.    600 units
  3.    0.6 units
  4.    60 units
 Discuss Question
Answer: Option A. -> 6 units
Question 394. Electricity is transmitted over long distances
  1.    It is fast
  2.    There is less wastage of energy
  3.    It is safer
  4.    It is cheaper
 Discuss Question
Answer: Option B. -> There is less wastage of energy
Question 395. Tungsten is used for the manufacture of the filament of an electric bulb, because
  1.    It is a good conductor
  2.    It is economical
  3.    It is malleable
  4.    It has a very high melting point
 Discuss Question
Answer: Option D. -> It has a very high melting point
Question 396. In a filament type light bulb most of the electric power consumed appears as
  1.    Visible light
  2.    Infra-red rays
  3.    Ultra-violet rays
  4.    Fluorescent light
 Discuss Question
Answer: Option B. -> Infra-red rays
Question 397. Which of the following metals is used for the manufacture of heating elements provided in electric iron ?
  1.    Nickel
  2.    Chromium
  3.    Nichrome
  4.    Tungsten
 Discuss Question
Answer: Option C. -> Nichrome
Question 398. When an electric bulb breaks, there is an explosive sound. That is due to
  1.    The chemical reaction between the gases inside the bulb
  2.    The compressed gases inside rushing out suddenly
  3.    The air outside rushing in to fill the vacuum inside the bulb
  4.    None of these
 Discuss Question
Answer: Option C. -> The air outside rushing in to fill the vacuum inside the bulb
Question 399. Flemings ''Left hand Rule" is associated with the effect of
  1.    Electric field on current
  2.    Magnetic field on magnet
  3.    Electric field on magnet
  4.    Magnetic Field on current
 Discuss Question
Answer: Option D. -> Magnetic Field on current
Question 400. Electromagnet is constructed with which of the following ?
  1.    Steel
  2.    Soft Iron
  3.    Aluminium
  4.    Nickel
 Discuss Question
Answer: Option B. -> Soft Iron

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