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MCQs

Total Questions : 219 | Page 17 of 22 pages
Question 161. Resistance of a tungsten lamp _____ as applied voltage increases.
  1.    Decreases
  2.    None of the listed here
  3.    Increases
  4.    Remains same
 Discuss Question
Answer: Option C. -> Increases
Question 162. Resistance of a carbon filament lamp _______ as the applied voltage increases.
  1.    Remains same
  2.    None of the listed here
  3.    Decreases
  4.    Increases
 Discuss Question
Answer: Option C. -> Decreases
Question 163. Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as
  1.    4 : 25
  2.    5 : 2
  3.    2 : 5
  4.    25 : 4
 Discuss Question
Answer: Option C. -> 2 : 5
Question 164. Which method can be used for absolute measurement of resistances?
  1.    Releigh method
  2.    Wheastone bridge method
  3.    Lorentz method
  4.    Ohm's law method
 Discuss Question
Answer: Option B. -> Wheastone bridge method
Question 165. Sparking occurs when a load is switched off because the circuit has high
  1.    Impedance
  2.    Resistance
  3.    Inductance
  4.    Capacitance
 Discuss Question
Answer: Option C. -> Inductance
Question 166. Ohm's law is not applicable to
  1.    Dc circuits
  2.    Semi-conductors
  3.    High currents
  4.    Small resistors
 Discuss Question
Answer: Option B. -> Semi-conductors
Question 167. Specific resistance of a substance is measured in
  1.    None of the listed here
  2.    Ω/m
  3.    Ω-m
  4.    m/Ω
 Discuss Question
Answer: Option C. -> Ω-m
Question 168. 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.    Increases
  2.    Heater will burn out
  3.    Remains same
  4.    Decreases
 Discuss Question
Answer: Option A. -> Increases
Question 169. The flow of current in solids is due to
  1.    Electrons and ions
  2.    Nucleus
  3.    Electrons
  4.    Atoms
 Discuss Question
Answer: Option C. -> Electrons
Question 170. Electric pressure is also called
  1.    Voltage
  2.    Power
  3.    Resistance
  4.    Energy
 Discuss Question
Answer: Option A. -> Voltage

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