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MCQs

Total Questions : 219 | Page 21 of 22 pages
Question 201. Electric current passing through the circuit produces
  1.    Luminous effect
  2.    Thermal effect
  3.    Chemical effect
  4.    Magnetic effect
 Discuss Question
Answer: Option B. -> Thermal effect
Question 202. Whether circuit may be AC. or D.C. one, following is most effective in reducing the magnitude of the current.
  1.    Reactor
  2.    Resistor
  3.    Inductor
  4.    Capacitor
 Discuss Question
Answer: Option B. -> Resistor
Question 203. An open resistor, when checked with an ohmmeter reads
  1.    Zero
  2.    Low but not zero
  3.    Infinite
  4.    High but within tolerance
 Discuss Question
Answer: Option C. -> Infinite
Question 204. Resistance of a material always decreases if
  1.    Number of free electrons available becomes more
  2.    None of these
  3.    Temperature of material is decreased
  4.    Temperature of material is increased
 Discuss Question
Answer: Option A. -> Number of free electrons available becomes more
Question 205. Current velocity through a copper conductor is
  1.    nearly 3 x 108 m/s
  2.    the same as propagation velocity of electric energy
  3.    independent of current strength
  4.    of the order of a few ^.s/m
 Discuss Question
Answer: Option D. -> of the order of a few ^.s/m
Question 206. 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.    None of these
  4.    Equal to the charge of the number of electrons in an atom (#) zero
 Discuss Question
Answer: Option B. -> Equal to the charge of an electron
Question 207. It becomes more difficult to remove
  1.    Second electron from the orbit
  2.    Any electron from the orbit
  3.    Third electron from the orbit
  4.    First electron from the orbit
 Discuss Question
Answer: Option C. -> Third electron from the orbit
Question 208. For which of the following 'ampere second' could be the unit?
  1.    Reluctance
  2.    Charge
  3.    Energy
  4.    Power
 Discuss Question
Answer: Option B. -> Charge
Question 209. Two resistances Rl and Ri are connected in series across the voltage source where Rl > Ri. The largest drop will be across
  1.    Ri
  2.    None of them
  3.    Rl
  4.    Either Rl or Ri
 Discuss Question
Answer: Option C. -> Rl
Question 210. A rheostat differs from potentiometer in the respect that it
  1.    Has large number of turns
  2.    Offers large number of tapping
  3.    Has lower wattage rating
  4.    Has higher wattage rating
 Discuss Question
Answer: Option D. -> Has higher wattage rating

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