Current Electricity MCQ

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• 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
• Electric pressure is also called
  ক

  Resistance

  খ

  Power

  গ

  Voltage

  ঘ

  Energy
• 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
• 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 %
• 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
• 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
• 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
• 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
• If I, R and t are the current, resistance and time respectively, then according to Joule’s law heat produced will be proportional to
  ক

  I²Rt

  খ

  I²Rt²

  গ

  I²R²t

  ঘ

  I²R²t²
• The number of electrons in the outer most orbit of carbon atom is
  ক

  3

  খ

  4

  গ

  6

  ঘ

  7
• When electric current passes through a metallic conductor, its temperature rises. This is due to
  ক

  Collisions between conduction electrons and atoms

  খ

  The release of conduction electrons from parent atoms

  গ

  Mutual collisions between metal atoms

  ঘ

  Mutual collisions between conducting electrons
• Ohm’s law is not applicable to
  ক

  vacuum tubes

  খ

  carbon resistors

  গ

  high voltage circuits

  ঘ

  circuits with low current densities
• Ohm's law is not applicable to
  ক

  Semiconductors

  খ

  D.C. circuits

  গ

  Small resistors

  ঘ

  High currents
• Out of the following which is an insulating material?
  ক

  Copper

  খ

  Gold

  গ

  Silver

  ঘ

  Paper
• If a parallel circuit is opened in the main line, the current
  ক

  Increases in the branch of the lowest resistance

  খ

  Increases in each branch

  গ

  Is zero in all branches

  ঘ

  Is zero in the highest resistive branch
• A substance whose molecules consist of dissimilar atoms is called
  ক

  Semiconductor

  খ

  Super-conductor

  গ

  Compound

  ঘ

  Insulator
• When electric current passes through a bucket full of water, lot of bubbling is observed. This suggests that the type of supply is
  ক

  A.C.

  খ

  D.C.

  গ

  Any of above two

  ঘ

  None of the above
• Insulating materials have the function of
  ক

  Preventing a short circuit between conducting wires

  খ

  Preventing an open circuit between the voltage source and the load

  গ

  Conducting very large currents

  ঘ

  Storing very high currents