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 23 of 53
- A. 6.2 A
- B. 5.2 A
- C. 4.2 A
- D. 2.2 A
- E. 1.2 A
Explanation: Resistance of resistors placed in series is calculated by adding the resistance,3+2=5 ohms.Formula connecting voltage,resistance and…
Correct answer: 1.2 A- A. 11Ω
- B. 121Ω
- C. 20Ω
- D. 200Ω
Explanation: We use the formula,P= V²/RR= V²/P = 110²/100 = 12100/100 = 121Ω
Correct answer: 121Ω- A. Battery is charging
- B. Battery is discharging
- C. Battery is connected with R
- D. Battery is connected with voltmeter
Explanation: When a battery is charging, it requires a higher external voltage to overcome its emf and internal resistance.
Correct answer: Battery is charging- A. Double
- B. Four times
- C. One half
- D. One fourth
Explanation: R= ρL/AL' = 2LA' = 1/2AR' = 2L/(1/2A)R' = 4L/AR' = 4 R
Correct answer: Four times- A. ohm
- B. ohm meter
- C. ohm/meter
- D. meter/ohm
Explanation: The unit of resistivity is Ohm-meter.Resistivity=Resistance x area/lengthResistivity=Ohm x Meter2/MeterResistivity=Ohm-meter.
Correct answer: ohm meter- A. Galvanometer
- B. Ohmmeter
- C. Ammeter
- D. Potentiometer
Explanation: A potentiometer is an instrument for measuring voltage or 'potential difference' by comparison of an unknown voltage with a known…
Correct answer: Potentiometer- A. 10-3 ms-1
- B. 104 ms-1
- C. 10-6 ms-1
- D. 107 ms-1
Explanation: Drift velocity refers to the average velocity at which charged particles, such as electrons, move through a conductor in the presence of…
Correct answer: 10-3 ms-1448. If a wire of resistance R is stretched into double of its length, then it's resistance becomes _.
- A. R
- B. 2R
- C. 3R
- D. 4R
Explanation: As the length of wire gets doubled, the cross-sectional area will become half of its previous value because the volume of wire remains…
Correct answer: 4R- A. 0.05
- B. 5
- C. 500
- D. 50000
Explanation: Option A: This is the power consumed if the current is 0.05 A. However, the current is given as 5 A, so this option is incorrect.
Correct answer: 500- A. Same current will flow through both resistances
- B. Current through smaller resistance is higher
- C. Current through larger resistance is higher
- D. Current can be higher in any resistance depending on emf of the cell
Explanation: Option A: The current cannot be the same through both resistances, because the resistances are different.
Correct answer: Current through smaller resistance is higher- A. Series combination of resistors
- B. Parallel combination of resistors
- C. Y delta combination of resistors
- D. None of the above
Explanation: When two or more resistors are joined side by side, this combination is called "parallel." In a parallel circuit, the voltage across each…
Correct answer: Parallel combination of resistors- A. Charge flow
- B. Current
- C. Both; charge flow and current
- D. Voltage
Explanation: Option A: The charge flow is also the same at all points in a series circuit.
Correct answer: Both; charge flow and current- A. 0.25 amp
- B. 0.5 amp
- C. 2 amp
- D. 4 amp
- E. 30 amp
Explanation: P=VI Rearranging this formula, I=P/V =60/120 =0.5 A
Correct answer: 0.5 amp- A. Resistance
- B. Inductance
- C. Conductivity
- D. Flexibility
Explanation: Conductivity is the measure of a material's ability to conduct electric current.
Correct answer: Conductivity- A. Changing
- B. Absolute zero
- C. Constant
- D. None of these options are correct
Explanation: We know that Ohm's Law is only applicable to linear resistances, where the resistance is the same with changes in voltage and current.
Correct answer: Constant- A. temperature
- B. length
- C. cross-sectional area
- D. None of these
Explanation: The resistivity of a material depends on its nature and the temperature of the conductor.
Correct answer: temperature- A. 1
- B. 0.1
- C. 0.01
- D. None of these
Explanation: We know that E = V + IrWhere r is the internal resistance.Subsituting the values in the formula:10 = 9 + 1r1 = 1rr = 1 ohm
Correct answer: 1- A. Motor
- B. Metals
- C. Battery
- D. Generator
Explanation: An electric battery is a source of electric power consisting of one or more electrochemical cells with external connections for powering…
Correct answer: Battery- A. H1 = H2
- B. H1 < H2
- C. H1 > H2
- D. None of the above
Explanation: When two wires of the same material and length are connected in series, their total resistance increases, which leads to a decrease in the…
Correct answer: H1 < H2- A. Series
- B. Parallel
- C. Any of these
- D. None of these
Explanation: Kirchhoff's current law states that the total current entering a junction must equal the total current leaving that junction.
Correct answer: Any of these