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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1,052 questions · page 15 of 53
- A. Good conductor
- B. Conductor
- C. Insulator
- D. Poor conductor
Explanation: A material with small resistivity allows electric current to flow easily, making it a good conductor of electricity.
Correct answer: Good conductor- A. Electrolysis
- B. Resistivity
- C. Conductivity
- D. None of above
Explanation: Electrolysis is the study of the conductance of electricity through liquids.
Correct answer: Electrolysis283. Conductance is
- A. Reciprocal of resistance
- B. Measured in ohm
- C. Another name of resistance
- D. All of the above
Explanation: Conductance is defined as the measure of how easily electric current flows through a material, and it is calculated as the reciprocal of…
Correct answer: Reciprocal of resistance- A. Silver
- B. Aluminium
- C. Copper
- D. All of above
Explanation: The correct answer is Silver because it has the lowest resistivity of all known materials, making it the most efficient conductor of…
Correct answer: Silver- A. Copper
- B. Aluminium
- C. Silver
- D. All of above
Explanation: Aluminum typically shows a positive temperature coefficient of resistance, meaning its resistance increases as temperature rises.
Correct answer: Aluminium- A. Four bands read from left to right
- B. Three bands read from left to right
- C. Four bands read from right to left
- D. None of these
Explanation: The color code for carbon resistors consists of four bands that are read from left to right.
Correct answer: Four bands read from left to right- A. Gives the third digit
- B. Gives the number of zeros
- C. Give the tolerance
- D. None of these
Explanation: In the color code for resistors, the third band represents the multiplier, indicating the number of zeros to add to the significant digits…
Correct answer: Gives the number of zeros288. The fourth band is a
- A. Gold band
- B. Silver band
- C. Brown band
- D. Both (a) and (b)
Explanation: The fourth band on a resistor represents the tolerance, which indicates the permissible deviation from the nominal resistance value.
Correct answer: Both (a) and (b)- A. ± 10%
- B. ± 20%
- C. ± 5%
- D. 10%
Explanation: The gold band on a resistor typically represents a tolerance level of ±5%.
Correct answer: ± 5%- A. ± 10%
- B. ± 20%
- C. ± 5%
- D. 10%
Explanation: The silver band on a resistor typically represents a tolerance level of ± 10%.
Correct answer: ± 10%- A. ± 10%
- B. ± 20%
- C. ± 5%
- D. 10%
Explanation: If there is no fourth band on a resistor, the tolerance is commonly assumed to be ± 20%.
Correct answer: ± 20%- A. Iron
- B. Silver
- C. Gold
- D. Manganin
Explanation: Manganin is commonly used as the wire material in the construction of rheostats.
Correct answer: Manganin- A. Fixed terminal A and sliding contact C
- B. Both fixed terminals A and B
- C. Fixed terminal B and sliding contact C
- D. All of above
Explanation: In a rheostat, the terminals used in a circuit are the fixed terminal A and the sliding contact C.
Correct answer: Fixed terminal A and sliding contact C- A. Gold
- B. Silver
- C. Manganese
- D. Carbon
Explanation: Thermistors are typically made from mixtures of metallic oxides, with manganese being one of the common components.
Correct answer: Manganese- A. High pressure and high temperature
- B. High pressure and low temperature
- C. Low pressure and low temperature
- D. None of these
Explanation: Thermistors can indeed be prepared under high pressure and high temperature conditions in certain manufacturing methods or applications.
Correct answer: High pressure and high temperature- A. Rods
- B. Washers
- C. Beads
- D. Either of these
Explanation: Thermistors can indeed be found in various forms, including rods, washers, and beads, depending on their intended application and the…
Correct answer: Either of these- A. Electrical voltage
- B. Light signals
- C. Sound signals
- D. All of above
Explanation: Temperature changes can indeed be converted into electrical voltage using devices called temperature sensors or thermometers.
Correct answer: Electrical voltage- A. W = AQ/V
- B. W = V/AQ
- C. W = VAQ
- D. W = I/VAQ
Explanation: The correct expression for the work done in moving a charge Q up through the potential difference V is:W = VAQThis equation represents the…
Correct answer: W = VAQ- A. V = E + Ir is applied
- B. V = E - Ir is applied
- C. It is being discharged
- D. Both (a) and (c)
Explanation: When the current is being drawn from the battery, the voltage across the battery terminals (V) is given by:a) V = E + IrThis equation…
Correct answer: Both (a) and (c)- A. Different
- B. Same
- C. Both zero
- D. None of them
Explanation: Terminal potential difference (V): This is the voltage measured across the terminals of the cell while it is connected to a load (i.e.…
Correct answer: Different