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PHYSICS MCQs

Total Questions : 3767 | Page 38 of 377 pages
Question 371. Brightness of bulb depends on voltage or current?
  1.    Current
  2.    Voltage
  3.    Both A & B
  4.    None
 Discuss Question
Answer: Option C. -> Both A & B
Question 372. The resistance of a conductor is inversely proportional to its:
  1.    Length
  2.    Resistivity
  3.    Temperature
  4.    Area of cross section
 Discuss Question
Answer: Option D. -> Area of cross section
Question 373. Which one of the following is an ohmic conductor?
  1.    Germanium
  2.    Silicon
  3.    Carbon
  4.    Silver
 Discuss Question
Answer: Option D. -> Silver
Question 374. What is the effective resistance (in Ω) of two resistors 20 Ω and 30 Ω connected in parallel?
  1.    50
  2.    12
  3.    24
  4.    36
 Discuss Question
Answer: Option B. -> 12
Question 375. Which elements are malleable and good conductors of electricity?
  1.    Tin and silver
  2.    Iodine and silver
  3.    Tin and xenon
  4.    Iodine and xenon
 Discuss Question
Answer: Option A. -> Tin and silver
Question 376. If electric resistance is to be decreased, then the number of resistances should be connected in ________
  1.    Series
  2.    Parallel
  3.    Mixed arrangement
  4.    None of these
 Discuss Question
Answer: Option B. -> Parallel
Question 377. What is the resistance (in ohm) of an electrical component if a current of 0.1 A passes through it on application of 5 V of potential difference across it?
  1.    0.5
  2.    100
  3.    50
  4.    1
 Discuss Question
Answer: Option C. -> 50
Question 378. Ampere second could be the unit of
  1.    Power
  2.    Energy
  3.    Conductance
  4.    Charge
 Discuss Question
Answer: Option C. -> Conductance
Question 379. Which one of the following is a good electrical conductor?
  1.    Graphite
  2.    Diamond
  3.    Peat
  4.    Charcoal
 Discuss Question
Answer: Option A. -> Graphite
Question 380. If a copper wire is increased to double its length, its resistance will become
  1.    Four times
  2.    One–fourth
  3.    Double
  4.    Half
 Discuss Question
Answer: Option A. -> Four times

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