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MCQs

Total Questions : 219 | Page 5 of 22 pages
Question 41. The minimum charge on an ion is
  1.    Equal to the atomic number of the atom
  2.    Equal to the charge of an electron
  3.    Equal to the charge of the number of electrons in an atom (#) zero
  4.    None of these
 Discuss Question
Answer: Option B. -> Equal to the charge of an electron
Question 42. For which of the following 'ampere second' could be the unit?
  1.    Reluctance
  2.    Charge
  3.    Power
  4.    Energy
 Discuss Question
Answer: Option B. -> Charge
Question 43. Current velocity through a copper conductor is
  1.    the same as propagation velocity of electric energy
  2.    independent of current strength
  3.    of the order of a few micro m/s
  4.    nearly 3 x 108 m/s
 Discuss Question
Answer: Option C. -> of the order of a few micro m/s
Question 44. An instrument which detects electric current is known as
  1.    Voltmeter
  2.    Rheostat
  3.    Watt-meter
  4.    Galvanometer
 Discuss Question
Answer: Option D. -> Galvanometer
Question 45. It becomes more difficult to remove
  1.    Any electron from the orbit
  2.    First electron from the orbit
  3.    Second electron from the orbit
  4.    Third electron from the orbit
 Discuss Question
Answer: Option D. -> Third electron from the orbit
Question 46. Two resistances Rl and Ri are connected in series across the voltage source where Rl > Ri. The largest drop will be across
  1.    Rl
  2.    Ri
  3.    Either Rl or Ri
  4.    None of them
 Discuss Question
Answer: Option A. -> Rl
Question 47. A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will:
  1.    Decrease
  2.    Increase
  3.    Remain same
  4.    Heater will burn out
 Discuss Question
Answer: Option B. -> Increase
Question 48. A closed switch has a resistance of
  1.    Zero
  2.    About 50 ohms
  3.    About 500 ohms
  4.    Infinity
 Discuss Question
Answer: Option A. -> Zero
Question 49. Which of the following materials has the least resistivity ?
  1.    Zinc
  2.    Lead
  3.    Mercury
  4.    Copper
 Discuss Question
Answer: Option D. -> Copper
Question 50. Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open
  1.    There will be heavy current in the main line
  2.    Rest of the two bulbs will not light
  3.    All three bulbs will light
  4.    The other two bulbs will light
 Discuss Question
Answer: Option D. -> The other two bulbs will light

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