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 25 of 53
- A. Barometer
- B. Manometer
- C. Galvanometer
- D. Voltmeter
Explanation: A voltmeter is an instrument used for measuring the electrical potential difference between two points in an electric circuit.
Correct answer: Voltmeter- A. I = VR
- B. V ∝ I
- C. V = IR
- D. Both Options B and C are correct
Explanation: According to Ohm's law,I ∝ VOr I = GVOr V = (1/G)IOr V = RI or V = IR
Correct answer: Both Options B and C are correct- A. Yes
- B. No
- C. Partly
- D. None of these options are correct
Explanation: Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points…
Correct answer: No- A. A high resistance in parallel
- B. A high resistance in series
- C. A low resistance in parallel
- D. A low resistance in series
Explanation: The resistance of the coil of the galvanometer on its own is low; hence, to convert a galvanometer into a voltmeter, its resistance must…
Correct answer: A high resistance in series- A. 2.5 C and 0.55 J
- B. 0.25 C and 0.55 J
- C. 0.25 C and 2.2 V
- D. 2.25 V and 0.55 J
Explanation: Q= I*t = 0.25*1 = 0.25 CV = U/q U= V*q = 2.2V*0.25C = 0.55J
Correct answer: 0.25 C and 0.55 J- A. Ampere
- B. Volt
- C. Joules
- D. Watt
Explanation: This is the standard answer.SI unit of Current is Ampere.The SI unit of Energy is JoulesThe SI unit of Power is WattThe SI unit of…
Correct answer: Ampere- A. P=l2R
- B. P=l2R/2
- C. P=IR
- D. All of them
Explanation: P = VIBut V= IRTherefore, P=(IR)×IP=I²RSo only option A is correct.
Correct answer: P=l2R- A. To increase current
- B. To decrease current
- C. To control current
- D. Just to give a good look to the circuit
Explanation: In a series circuit, adding resistance is a way to control the current flow through the circuit.
Correct answer: To control current- A. 2.0 x 10^-2 eV
- B. 2.0 x 10^-3 eV
- C. 2.0 x 10^2 eV
- D. 2.0 x 10^3 eV
Explanation: Energy = qV= 20e x 100V= 2 x 103 eVHence, option D is the correct option.
Correct answer: 2.0 x 10^3 eV- A. 50 W
- B. 75 W
- C. 100 W
- D. 90 W
Explanation: Power = VI. Given that current = 3A and Voltage = 250VSo, 0.3 x 250 = 75 W
Correct answer: 75 W- A. 100W
- B. 200W
- C. 60W
- D. None of these options are correct
Explanation: 200W bulb has the thickest filament is correct. Higher the power rated, lower will be the resistance.
Correct answer: 200W- A. 160 ohm
- B. 80 ohm
- C. 20 ohm
- D. 10 ohm
Explanation: Since both conductors are made from copper, their resistivity ρ is the same. Both conductors are of equal lengths so l is also the same.
Correct answer: 10 ohm- A. 1500 Coulomb
- B. 150 Coulomb
- C. 13400 Coulomb
- D. 140 Coulomb
Explanation: Charge = Current x timeCharge = 10 x 15Charge = 150 C
Correct answer: 150 Coulomb- A. 1.6 x 10^-19 J
- B. 9.6 x 10^-19 J
- C. 9.6 x 10^-18 J
- D. 1.6 x 10^-18 J
Explanation: Energy acquired = 3e x 2V = 6eV = 6 x 1.6 x 10-19 = 9.6 x 10-19
Correct answer: 9.6 x 10^-19 J- A. Semiconductors
- B. Vacuum tubes
- C. Carbon resistors
- D. None of these
Explanation: The correct answer is C: Carbon resistors. Ohm's Law, which states that the current passing through a conductor between two points is…
Correct answer: Carbon resistors- A. P=V/I
- B. P=VI
- C. 2P=I+V
- D. All of them
Explanation: Correct option is B.Electrical power is the product of voltage and current. P = V X IP = E t.P = W t.P = V 2 /R.P=I2R
Correct answer: P=VI- A. 1 ohm
- B. 2 ohm
- C. 3 ohm
- D. 4 ohm
Explanation: Correct option is D.The correct solution is given as:
Correct answer: 4 ohm- A. 12000 volts
- B. 15000 volts
- C. 20000 volts
- D. 300 volts
Explanation: Correct option is B. According to the given formula: V = I R V = 300 × 40 V = 12000 Volt As this is a numerical thus only one option is…
Correct answer: 12000 volts- A. Resistivity
- B. Magnetic field
- C. Capacitance
- D. Resistance
Explanation: Conductivity is an intrinsic property of a material that measures how easily electricity flows.
Correct answer: Resistivity- A. Currents
- B. Semi-conductors
- C. Resistors
- D. Batteries
Explanation: Ohm's law states that the current flowing through a conductor is directly proportional to the voltage V applied to it i.e. V = IR.
Correct answer: Resistors