Current Electricity(Engineering > Electrical Engineering ) Questions and Answers

Question 1. Which method can be used for absolute measurement of resistances?
  1.    Lorentz method
  2.    Raleigh method
  3.    Ohm's law method
  4.    Wheatstone bridge method
Explanation:-
Answer: Option D. -> Wheatstone bridge method
Question 2. Conductance is reciprocal of
  1.    Resistance
  2.    Inductance
  3.    Reluctance
  4.    Capacitance
Explanation:-
Answer: Option A. -> Resistance
Question 3. A field of force can exist only between
  1.    Two molecules
  2.    Two ions
  3.    Two atoms
  4.    Two metal particles
Explanation:-
Answer: Option B. -> Two ions
Question 4. 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 should be decreased
  2.    Length of heating element should be increased
  3.    Length of heating element has no effect on heating if water
  4.    None of the above
Explanation:-
Answer: Option A. -> Length of heating element should be decreased
Question 5. A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is
  1.    6.4 A, 6.9 A
  2.    6.4 A, 9.6 A
  3.    4.6 A, 6.9 A
  4.    4.6 A, 9.6 A
Explanation:-
Answer: Option B. -> 6.4 A, 9.6 A
Question 6. Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be
  1.    9 times
  2.    1/9 times
  3.    1/3 times
  4.    3 times
Explanation:-
Answer: Option B. -> 1/9 times
Question 7. 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.    Resistance of heater coil is more than the supply wires
  4.    Supply wires are made of superior material
Explanation:-
Answer: Option C. -> Resistance of heater coil is more than the supply wires
Question 8. A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is
  1.    400 Q
  2.    600 Q
  3.    800 Q
  4.    1000 Q
Explanation:-
Answer: Option C. -> 800 Q
Question 9. Which of the following quantities remain the same in all parts of a series circuit?
  1.    Voltage
  2.    Current
  3.    Power
  4.    Resistance
Explanation:-
Answer: Option B. -> Current
Question 10. International ohm is defined in terms of the resistance of
  1.    A column of mercury
  2.    A cube of carbon
  3.    A cube of copper
  4.    The unit length of wire
Explanation:-
Answer: Option A. -> A column of mercury
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