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MCQs

Total Questions : 219 | Page 18 of 22 pages
Question 171. When one lag of parallel circuit is opened out the total current will
  1.    Increases
  2.    Decreases
  3.    Become zero
  4.    None of the listed here
 Discuss Question
Answer: Option B. -> Decreases
Question 172. The resistance of conductor varies inversely as
  1.    Length
  2.    Area of cross-section
  3.    Resistivity
  4.    Temperature
 Discuss Question
Answer: Option B. -> Area of cross-section
Question 173. If the efficiency of a machine is to be high, what should be low?
  1.    kWh consumed
  2.    Losses
  3.    Input power
  4.    True component of power
 Discuss Question
Answer: Option B. -> Losses
Question 174. SI unit of power is
  1.    Watt-hour
  2.    Coulomb
  3.    Watt
  4.    Henry
 Discuss Question
Answer: Option C. -> Watt
Question 175. A field of force can exist only between
  1.    Two metal particles
  2.    Two ions
  3.    Two atoms
  4.    Two molecules
 Discuss Question
Answer: Option B. -> Two ions
Question 176. In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains
  1.    Length of heating element has no effect on heating if water
  2.    Length of heating element should be increased
  3.    Length of heating element should be decreased
  4.    None of these
 Discuss Question
Answer: Option C. -> Length of heating element should be decreased
Question 177. All good conductors have high
  1.    Resistance
  2.    Reluctance
  3.    Conductance
  4.    Thermal conductivity
 Discuss Question
Answer: Option C. -> Conductance
Question 178. Conductance is reciprocal of
  1.    Resistance
  2.    Capacitance
  3.    Reluctance
  4.    Inductance
 Discuss Question
Answer: Option A. -> Resistance
Question 179. When current flows through heater coil it glows but supply wiring does not glow because
  1.    Current through supply line flows at slower speed
  2.    Supply wiring is covered with insulation layer
  3.    Supply wires are made of superior material
  4.    Resistance of heater coil is more than the supply wires
 Discuss Question
Answer: Option D. -> Resistance of heater coil is more than the supply wires
Question 180. International ohm is defined in terms of the resistance of
  1.    A cube of copper
  2.    A column of mercury
  3.    A cube of carbon
  4.    The unit length of wire
 Discuss Question
Answer: Option B. -> A column of mercury

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