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. Filament bulb
- B. Transistor
- C. Semiconductor diode
- D. Copper wire
Explanation: Copper wire is an ohmic device, as voltage rises current in it also rises.Option A,B and C are non ohmic devices because they don't obey…
Correct answer: Copper wire- A. Electrolytes
- B. Ions moving charges
- C. Moving charges
- D. Static charges
Explanation: The internal resistance depends on the nature of electrolyte if it is conductive in nature there will be low resistance and vice versa.
Correct answer: Electrolytes- A. Two cells are connected in series and the third cell in parallel with the combination
- B. All three cells are connected in parallel
- C. Two cells are connected in parallel and the third cell in series with the combination
- D. The load connected to the combination is minimum
- E. All three cells are connected in series
Explanation: The potential difference is maximum across a circuit if cells are connected in series.
Correct answer: All three cells are connected in series- A. Laplace's Law
- B. Ohm's Law
- C. Coulomb's Law
- D. Charles's Law
- E. Boyle's Law
Explanation: Ohm's Law states that the current through a conductor is directly proportional to the voltage across it and inversely proportional to its…
Correct answer: Ohm's Law- A. Resistance
- B. Electromotive force
- C. Internal resistance
- D. Resistivity
- E. Potentíal difference
Explanation: Potential difference, often referred to as voltage, is the difference in electric potential between two points in an electric field.
Correct answer: Potentíal difference- A. Weight of material
- B. Charge of material
- C. Shape of material
- D. Size of material
- E. Temperature of material
Explanation: The resistivity of a material depends upon its temperature.
Correct answer: Temperature of material- A. Volt
- B. Ohm
- C. Watt
- D. Coulomb per second
- E. Coulomb
Explanation: The unit of current is Ampere which can also be written as coulumb per second.
Correct answer: Coulomb per second- A. Joule's Law
- B. Gauss Law
- C. Ohm's Law
- D. Ampere's Law
Explanation: The current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the two points and…
Correct answer: Ohm's Law- A. Current
- B. Volt
- C. Resistance
- D. Power
Explanation: Current is measured in Amperes (A), representing the flow of electric charge.Volt is a measure of electric potential difference.Resistance…
Correct answer: Power- A. Current and time
- B. Voltage and time
- C. Voltage and current
- D. Reverse voltage forward voltage
Explanation: B is the correct option. A diode characteristic curve, also known as the I-V (current-voltage) curve, illustrates the relationship between…
Correct answer: Voltage and current- A. Ampere
- B. Coulomb
- C. Ohm
- D. Ohm metre
Explanation: The SI unit of current, both conventional and electronic, is Ampere.
Correct answer: Ampere- A. Conductance
- B. Conductivity
- C. Resistance
- D. Resistivity
Explanation: The slope of current vs. voltage graph gives conductance.
Correct answer: Conductance- A. Copper
- B. Germanium
- C. Sulphur
- D. Zinc
Explanation: Germanium has a negative temperature coefficient of resistance, indicating that its resistance decreases as temperature increases.
Correct answer: Germanium- A. The amount of charge transported by a current of 1 Ampere in 1 second
- B. The charge of 1 proton
- C. The charge of 1 electron
- D. The charge required to create a force of 1 Newton between two charges separated by 1 meter
Explanation: I=Q/tQ will be 1C if time is 1second and current is 1ampere.
Correct answer: The amount of charge transported by a current of 1 Ampere in 1 second- A. Curved
- B. Horizontal
- C. Linear
- D. Perpendicular
Explanation: The I-V graph of non-ohmic materials is characterized by a curved shape rather than a straight line, indicating a non-linear relationship…
Correct answer: Curved- A. Degree rise in temperature
- B. Unit increase in electric current
- C. Unit decrease in capacitance
- D. Degree drop in temperature
Explanation: The temperature coefficient of resistance (α) is defined as the increase in resistance per ohm of the original resistance per degree…
Correct answer: Degree rise in temperature- A. Infinity
- B. Negative
- C. Positive
- D. Zero
Explanation: The coefficient of temperature for resistance in metals is positive.
Correct answer: Positive- A. R1 is two times R2
- B. R2 is two times R1
- C. R2 is four times R1
- D. R1 is four times R2
Explanation: The power formula P = V^2/R can be rearranged to find the resistance R = V^2/P.
Correct answer: R1 is two times R2- A. The load resistance is half of the source resistance
- B. The load resistance is zero
- C. The load resistance is double the source resistance
- D. The load resistance is equal to the source resistance
Explanation: When the load resistance matches the source resistance, the system operates at optimal efficiency, ensuring that the maximum possible…
Correct answer: The load resistance is equal to the source resistance- A. 5A
- B. 10A
- C. 25A
- D. 50A
Explanation: Voltage across each resistor: In a parallel circuit, the voltage across each resistor is the same as the source voltage.
Correct answer: 5A