Free Current Electricity MCQs with Answers
1,052 Current Electricity MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.
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- A. Electric Kettle
- B. Electric motor
- C. Electric Toaster
- D. Both (a) and (c)
Explanation: Both an electric kettle (option A) and an electric toaster (option C) use the heating effect of current to generate heat for boiling water…
Correct answer: Both (a) and (c)- A. To detect a current
- B. To measure a current
- C. In electric motor
- D. All of above
Explanation: The magnetic effect is utilized in various ways in electrical applications:- Detecting currents: Magnetic instruments like galvanometers…
Correct answer: All of above- A. Liquids
- B. Solids
- C. Gases
- D. All
Explanation: Liquid, is because electrolysis primarily involves the conduction of electricity through a liquid electrolyte solution, where ions migrate…
Correct answer: Liquids- A. Electrolyte
- B. Thermometer
- C. Voltameter
- D. None of these
Explanation: The voltameter is the vessel containing electrodes and the electrolyte solution where electrolysis occurs.
Correct answer: Voltameter- A. Dilute solution of CuSO4
- B. Water
- C. Carbon
- D. CuSO4 in solid form
Explanation: A voltameter typically contains a dilute solution of copper sulfate (CuSO4), which serves as the electrolyte for conducting electricity…
Correct answer: Dilute solution of CuSO4- A. Remains constant
- B. Decreased
- C. Increased
- D. None of these
Explanation: The density of a CuSO4 solution remains constant during electrolysis, assuming there are no significant changes in the concentration or…
Correct answer: Remains constant- A. Quality of electricity passed through the liquid
- B. Colour of the liquid
- C. Nature of the liquid
- D. Both (a) and (c)
Explanation: The magnitude of magnetic effects in electrolysis depends on both the quality of electricity passed through the liquid (such as current…
Correct answer: Both (a) and (c)- A. V = I/R
- B. V=IR
- C. R=VI
- D. None of above
Explanation: It states that the voltage across a conductor is directly proportional to the current flowing through it, with the constant of…
Correct answer: V=IR- A. Super conductors
- B. Semi-conductors
- C. Ohmic
- D. Non-ohmic
Explanation: Conductors that obey Ohm's law are referred to as ohmic conductors. Ohmic conductors have a constant resistance, meaning that the…
Correct answer: Ohmic- A. Non-Ohmic
- B. Ohmic
- C. Super conductors
- D. Semi-conductors
Explanation: Non-ohmic conductors are materials that do not follow Ohm's law. They have resistance that changes with variations in voltage or current.
Correct answer: Non-Ohmic- A. A curve
- B. A straight line
- C. Parabola
- D. None of above
Explanation: Ohmic devices exhibit a linear relationship between voltage (V) and current (I), resulting in a straight-line graph when plotted.
Correct answer: A straight line- A. Not a straight line
- B. A straight line
- C. A curve
- D. All of above
Explanation: For non-ohmic devices, the graph between voltage (V) and current (I) is not a straight line.
Correct answer: Not a straight line- A. Conductance
- B. Inductance
- C. Resistance
- D. None of above
Explanation: Resistance is the opposition of a conductor to the flow of electric current.
Correct answer: Resistance- A. Resistivity
- B. Inductivity
- C. Permitivity
- D. Conductivity
Explanation: Resistivity is the intrinsic property of a material that quantifies how strongly it resists the flow of electric current.
Correct answer: Resistivity- A. Ohm
- B. Ampere
- C. Volt
- D. Joule
Explanation: The ohm (symbol: Ω) is the SI unit of electrical resistance. It measures how much a material opposes the flow of electric current.
Correct answer: Ohm- A. Ohm-m
- B. Ohm-m2
- C. Ohm-m3
- D. Ohm
Explanation: Resistivity is a measure of how strongly a material opposes the flow of electric current.
Correct answer: Ohm-m- A. Conductance
- B. Inductance
- C. Reactance
- D. Resistivity
Explanation: Conductance is the reciprocal of resistance, meaning it is the inverse of resistance.
Correct answer: Conductance- A. Conductivity
- B. Permitivity
- C. Resistance
- D. Voltage
Explanation: Conductivity is the reciprocal of resistivity. It measures how easily a material allows the flow of electric current.
Correct answer: Conductivity- A. mho
- B. Ohm
- C. mho-m-1
- D. None of above
Explanation: The SI unit of conductance is "mho," which is symbolized by the upside-down Greek letter "℧." It is also sometimes represented as…
Correct answer: mho- A. An insulator
- B. A poor conductor
- C. A good conductor
- D. A conductor
Explanation: A material with large resistivity restricts the flow of electric current, behaving as an insulator.
Correct answer: An insulator