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 49 of 53
- A. 0.44 A.
- B. 2.27 A.
- C. 5.44 A.
- D. 7.27 A.
Explanation: The correct answer is Option B: 2.27 A. To find the electric current passing through the bulb, we use the formula: Current (I) = Power (P)…
Correct answer: 2.27 A.- A. i2 = i1 + i3 + i4 +i5
- B. i2 = i1 + i3 - i4 +i5
- C. i2 = i1 - i3 + i4 + i5
- D. i2 = i1 - i3 - i4 + i5
Explanation: In this circuit, according to Kirchhoff's first law, the sum of currents entering the junction should be equal to the sum of currents…
Correct answer: i2 = i1 - i3 - i4 + i5- A. negative to positive terminals only.
- B. positive to negative terminals only.
- C. negative to positive terminals and vice versa.
- D. positive to negative terminals and vice versa.
Explanation: The correct answer is Option B: positive to negative terminals only. Conventional current flow in an electric circuit is defined as the…
Correct answer: positive to negative terminals only.- A. ellipse.
- B. parabola
- C. hyperbola
- D. straight line
Explanation: The correct answer is Option D: straight line. When the resistance remains constant, the graph of Ohm's law shows a straight line because…
Correct answer: straight line- A. lesser than the circuit resistance
- B. greater than the circuit resistance.
- C. equal or lesser than the circuit resistance
- D. equal or greater than the circuit resistance
Explanation: The correct answer is Option A: lesser than the circuit resistance. This is because the ammeter should have a lower resistance than the…
Correct answer: lesser than the circuit resistance- A. area of the coil
- B. amount of current
- C. strength of magnetic field
- D. number of turns in the coil
Explanation: The correct answer is amount of current. The sensitivity of a galvanometer refers to its ability to detect small changes in current, not…
Correct answer: amount of current- A. 11 A
- B. 110 A
- C. 200 A
- D. 240 A
Explanation: To determine the current in the circuit, we apply Ohm's Law, which states that I = V/R, where I is the current in amperes (A), V is the…
Correct answer: 11 A- A. Increase the impurity in water
- B. Decrease the amount of current
- C. Use the kettle with an open lid
- D. Increase the power supply
Explanation: The correct answer is to increase the power supply. To boil the same amount of water in half the time, the energy input needs to be…
Correct answer: Increase the power supply- A. Increase.
- B. Decrease.
- C. Become infinite.
- D. Remain the same.
Explanation: The balancing length in a potentiometer is determined by the point where the potential difference across the wire matches the potential…
Correct answer: Become infinite.- A. Measure resistance.
- B. Compare two voltages.
- C. Measure alternating current.
- D. Compare alternating and direct current.
Explanation: The correct answer is Option B: A potentiometer is primarily used to compare two voltages.
Correct answer: Compare two voltages.- A. Erg/second.
- B. Joule/second.
- C. Dyne/second.
- D. Coulomb/second.
Explanation: The unit for electric current is the ampere, which is equivalent to one coulomb of charge passing through a point in a circuit per second.
Correct answer: Coulomb/second.- A. 1.66 A
- B. 3.57 A
- C. 4.54 A
- D. 6.25 A
Explanation: The power formula is given by P = VI, where P is the power in watts, V is the voltage in volts, and I is the current in…
Correct answer: 1.66 A- A. The current is flowing from a standard cell with lower internal resistance compared to the cell under test.
- B. The current is flowing from a standard cell with higher internal resistance compared to the cell under test.
- C. The cell from which the current is drawn has no impact on the balance point of a potentiometer.
- D. The current is drawn equally from both a standard cell and the cell under test.
Explanation: The correct answer is Option A. In a potentiometer setup, the balance point is determined by the reference voltage from a standard cell…
Correct answer: The current is flowing from a standard cell with lower internal resistance compared to the cell under test.- A. I and II.
- B. I and IV.
- C. II and III.
- D. III and IV.
Explanation: The correct answer is Option B: I and IV. Resistors (I) are fundamental components in controlling current by providing resistance, which…
Correct answer: I and IV.- A. 0.4 W.
- B. 2.2 W.
- C. 100.0 W.
- D. 1064.8 W.
Explanation: To find the power dissipated in the light bulb, use the formula P = V²/R, where V is the voltage (220 V) and R is the resistance (484 Ω).
Correct answer: 100.0 W.- A. 18.333 A.
- B. 0.44 A.
- C. 0.022 A.
- D. 0.000484 A.
Explanation: The correct answer is Option C: 0.022 A. To find the electric current flowing through the bulb, use the formula P = IV, where P is power…
Correct answer: 0.022 A.- A. Potentiometer has a very low cost.
- B. Potentiometer is less sensitive than a voltmeter.
- C. Potentiometer does not take current from the circuit.
- D. Internal resistance of the potentiometer is more than a voltmeter.
Explanation: The correct answer is that a potentiometer does not take current from the circuit.
Correct answer: Potentiometer does not take current from the circuit.- A. 1.80 V.
- B. 1.25 V.
- C. 0.8 V.
- D. 0.5 V.
Explanation: In a potentiometer, the voltage is directly proportional to the balance length when the current and resistance are constant.
Correct answer: 1.80 V.- A. Increased.
- B. Decreased.
- C. Fixed at zero.
- D. Kept constant.
Explanation: To move the balance point from the 7th wire to the 9th wire, the resistance of the potentiometer must be increased.
Correct answer: Increased.- A. limited to 100 cm.
- B. As long as possible
- C. As short as possible
- D. limited to less than 500 cm.
Explanation: A longer potentiometer wire provides a greater potential gradient, meaning a smaller change in length corresponds to a smaller change in…
Correct answer: As long as possible