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 21 of 53
- A. Potentiometer
- B. Digital voltmeter
- C. Cathode ray oscilloscope
- D. All of above
Explanation: Explanation for this question will be added soon
Correct answer: All of above- A. Circuit is open
- B. Circuit is closed
- C. Small battery is charged by bigger battery
- D. None of these
Explanation: Explanation for this question will be added soon
Correct answer: Small battery is charged by bigger battery- A. Chemical
- B. Solar
- C. Light
- D. None of these
Explanation: Explanation for this question will be added soon
Correct answer: Chemical- A. 20 Ω
- B. 40 Ω
- C. 60 Ω
- D. 80 Ω
Explanation: Explanation for this question will be added soon
Correct answer: 60 Ω- A. I
- B. Resistivity
- C. Conductance
- D. Zero
Explanation: Resistance (R) is a measure of how much a material opposes the flow of electric current, and its unit is ohms (Ω).
Correct answer: Conductance- A. Free electrons and ions
- B. Electrons
- C. Electrons and protons
- D. Positive and negative ions
Explanation: In metallic conductors, electrons are the primary charge carriers responsible for conducting electricity due to their ability to move…
Correct answer: Electrons- A. Atoms and molecules
- B. Positive charge
- C. Negative charge
- D. Both (b) and (c)
Explanation: Explanation for this question will be added soon
Correct answer: Positive charge- A. None
- B. Temperature coefficient of resistance
- C. Thermal coefficient
- D. Volumetric coefficient of expansion
- E. Linear coefficient of expansion
Explanation: The fractional change in resistance per kelvin is called the temperature coefficient.The temperature coefficient of resistance is a…
Correct answer: Temperature coefficient of resistance- A. Decrease in temperature and decrease in resistance
- B. Increase in temperature and increase in resistance
- C. Decrease in temperature and increase in resistance
- D. Increase in temperature and decrease in resistance
Explanation: The most common scenario leading to a deviation from a straight-line I-V graph is an increase in temperature and an increase in…
Correct answer: Increase in temperature and increase in resistance- A. I/4
- B. 2I
- C. I
- D. I/2
Explanation: R=ρl/AWhen radius is doubled : Area=2*pi*(2r) = 2*pi*4rHence the area has increased by 4 times.New resistance : Rx = ρ*2l/4A = ½ RV=IR…
Correct answer: 2I- A. 10 V
- B. 30 V
- C. 40 V
- D. 50 V
- E. 70 V
Explanation: 40 = I x (15+ 5) 40= I x 20 I = 40/20 I= 2 AVoltage drop across resistor R V= IR V= 2 x 15 V= 30 V (hence B is the correct option)
Correct answer: 30 V- A. 4 x 10^-28 m-3
- B. 1.6 x 10^-27 m-3
- C. 2.5 x 10^-27 m-3
- D. 6.3 x 10^28 m-3
- E. 1.3 x 10^34 m-3
Explanation: The formula for electric current relating the drift velocity is: I = neAV Where; I = Electric current n = Number of charges per unit…
Correct answer: 6.3 x 10^28 m-3- A. 1.8 μA
- B. 250 μA
- C. 300 μA
- D. 1.5 mA
- E. 1.8 mA
Explanation: Given details: Galvanometer resistance = 30 ohm Thermocouple couple resistance = 6 ohm So, Total resistance = 30+6 = 36 ohm Temperature…
Correct answer: 250 μA- A. 0 V
- B. 0.8 V
- C. 2.6 V
- D. 5.2 V
- E. 6.0 V
Explanation: The emf of a battery is generated by the chemical action in the battery.
Correct answer: 6.0 V- A. 1 A
- B. 2 A
- C. 4 A
- D. 6 A
- E. infinite
Explanation: Current in the circuit is I = E/r + R = 4/r + 2 = 1or 2 + r = 4or r = 2 ohmsWhen the terminals of battery are connected directly, the…
Correct answer: 2 A- A. 0.1 K-1
- B. 0.02 K-1
- C. 0.01 K-1
- D. 0.2 K-1
Explanation: You can solve the question using following solution:
Correct answer: 0.1 K-1- A. 1.5 x 10^19 electrons
- B. 2.75 x 10^19 electrons
- C. 3.25 x 10^19 electrons
- D. 2.75 x 10^15 electrons
- E. 3.25 x 10^17 electrons
Explanation: 4.4 Amperes means that 4.4 coulomb of charge passes through the conductor in one second.1e contains 1.6x10-19 C , so 4.4 C will contain…
Correct answer: 2.75 x 10^19 electrons- A. Slide-wire bridge
- B. Meter bridge
- C. Post office box
- D. All of these
- E. None of these
Explanation: The correct answer is 'All of these'. Each option - slide-wire bridge, meter bridge, and post office box - utilizes the Wheatstone Bridge…
Correct answer: All of these- A. Meter Bridge
- B. The Post Office Box
- C. Carey Foster's Bridge
- D. Calendar
- E. A, B and C
Explanation: All of the above mentioned instruments work upon the principle of Wheatstone bridge to measure the resistance except calendar.The…
Correct answer: A, B and C- A. 0.3 Ω
- B. 0.9 Ω
- C. 1.3 Ω
- D. 0.09 Ω
- E. 0.03 Ω
Explanation: Attached below is the solution to the question above:
Correct answer: 0.09 Ω