Current Electricity MCQ

Test your knowledge with important Current Electricity MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Current Electricity MCQs at Bissoy

• Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct?
  ক

  100 W lamp will glow brighter

  খ

  40 W lamp will glow brighter

  গ

  Both lamps will glow equally bright

  ঘ

  40 W lamp will fuse
• With rise in temperature the resistance of pure metals
  ক

  Increases

  খ

  Decreases

  গ

  First increases and then decreases

  ঘ

  Remains constant
• Voltage dependent resistors are used
  ক

  For inductive circuits

  খ

  To suppress surges

  গ

  As heating elements

  ঘ

  As current stabilizers
• The hot resistance of the bulb's filament is higher than its cold resistance because the temperature coefficient of the filament is
  ক

  Zero

  খ

  Negative

  গ

  Positive

  ঘ

  About 2 ohms per degree
• The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other?
  ক

  18 ohms

  খ

  36 ohms

  গ

  48 ohms

  ঘ

  64 ohms
• Electric pressure is also called
  ক

  Resistance

  খ

  Power

  গ

  Voltage

  ঘ

  Energy
• A 3 ohm resistor having 2 A current will dissipate the power of
  ক

  2 watts

  খ

  4 watts

  গ

  6 watts

  ঘ

  8 watts
• In a lamp load when more than one lamp are switched on the total resistance of the load
  ক

  Increases

  খ

  Decreases

  গ

  Remains same

  ঘ

  None of the above
• In the case of direct current
  ক

  Magnitude and direction of current remains constant

  খ

  Magnitude and direction of current changes with time

  গ

  Magnitude of current changes with time

  ঘ

  Magnitude of current remains constant
• If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes
  ক

  0.4 ohm

  খ

  0.6 ohm

  গ

  0.8 ohm

  ঘ

  1.0 ohm
• In a circuit a 33 Ohm resistor carries a current of 2 A. The voltage across the resistor is
  ক

  33 V

  খ

  66 V

  গ

  80 V

  ঘ

  132 V
• The weight of an aluminium conductor as compared to a copper conductor of identical cross-section, for the same electrical resistance, is
  ক

  50 %

  খ

  60 %

  গ

  100 %

  ঘ

  150 %
• The resistance of a copper wire 200 m long is 21 $$\Omega .$$ If its thickness (diameter) is 0.44 mm, its specific resistance is around
  ক

  1.2 x 10^-8 $$\Omega $$-m

  খ

  1.4 x 10^-8 $$\Omega $$-m

  গ

  1.6 x 10^-8 $$\Omega $$-m

  ঘ

  1.8 x 10^-8 $$\Omega $$-m
• Voltage dependent resistors are usually made from
  ক

  Charcoal

  খ

  Silicon carbide

  গ

  Nichrome

  ঘ

  Graphite
• Which of the following statement is true both for a series and a parallel D.C. circuit?
  ক

  Elements have individual currents

  খ

  Currents are additive

  গ

  Voltages are additive

  ঘ

  Power are additive
• When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will
  ক

  Decrease

  খ

  Increase

  গ

  Remain constant

  ঘ

  None of the above
• Out of the following which is not a poor conductor?
  ক

  Cast iron

  খ

  Copper

  গ

  Carbon

  ঘ

  Tungsten
• The insulation on a current carrying conductor is provided
  ক

  To prevent leakage of current

  খ

  To prevent shock

  গ

  Both of above factors

  ঘ

  None of above factors
• With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals
  ক

  10 W

  খ

  20 W

  গ

  40 W

  ঘ

  60 W
• International ohm is defined in terms of the resistance of
  ক

  A column of mercury

  খ

  A cube of carbon

  গ

  A cube of copper

  ঘ

  The unit length of wire
• A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is
  ক

  400 Ohms

  খ

  600 Ohms

  গ

  800 Ohms

  ঘ

  1000 Ohms
• Which of the following quantities remain the same in all parts of a series circuit?
  ক

  Voltage

  খ

  Current

  গ

  Power

  ঘ

  Resistance
• When current flows through heater coil it glows but supply wiring does not glow because
  ক

  Current through supply line flows at slower speed

  খ

  Supply wiring is covered with insulation layer

  গ

  Resistance of heater coil is more than the supply wires

  ঘ

  Supply wires are made of superior material
• Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be
  ক

  9 times

  খ

  $$\frac{1}{9}$$ times

  গ

  $$\frac{1}{3}$$ times

  ঘ

  3 times
• 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
  ক

  6.4 A, 6.9 A

  খ

  6.4 A, 9.6 A

  গ

  4.6 A, 6.9 A

  ঘ

  4.6 A, 9.6 A
• In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains
  ক

  Length of heating element should be decreased

  খ

  Length of heating element should be increased

  গ

  Length of heating element has no effect on heating if water

  ঘ

  None of the above
• Conductance is reciprocal of
  ক

  Resistance

  খ

  Inductance

  গ

  Reluctance

  ঘ

  Capacitance
• A field of force can exist only between
  ক

  Two molecules

  খ

  Two ions

  গ

  Two atoms

  ঘ

  Two metal particles
• Which method can be used for absolute measurement of resistances?
  ক

  Lorentz method

  খ

  Raleigh method

  গ

  Ohm's law method

  ঘ

  Wheatstone bridge method
• What is the answer to this question? The resistance of a few meters of wire conductor in closed electrical circuit is
  ক

  Practically zero

  খ

  Low

  গ

  High

  ঘ

  Very high