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 5 of 53
- A. 3.66 x 10 ̄3 k ̄1
- B. 4.66 x 10 ̄3 k ̄1
- C. 6.31 x 10 ̄3 k ̄1
- D. 7.42 x 10 ̄3 k ̄1
- E. 9.49 x 10 ̄3 k ̄1
Explanation: Formula for the temperature coefficient is as follows:= (20-10) / (10 x (273-0))=10/(10 x 273)=1 / 273=3.66 x 10-3 K-1
Correct answer: 3.66 x 10 ̄3 k ̄1- A. Conductivity
- B. Resistivity
- C. Temperature coefficient of resistivity
- D. Temperature coefficient of resistance
Explanation: The temperature coefficient of resistance represents how the resistance of a conductor changes with temperature.
Correct answer: Temperature coefficient of resistance- A. Non conservative
- B. Conservative
- C. Both A and B
- D. None
Explanation: Non-conservative forces are those that do dissipate energy as an object moves through a closed path.
Correct answer: Non conservative- A. Charge
- B. current
- C. Power
- D. Temperature
Explanation: The resistance of a conductor depends on its temperature according to the formula R = R₀(1 + αΔT), where R₀ is the initial resistance, α…
Correct answer: Temperature- A. very good conductor
- B. moderately good conductor
- C. an insulator
- D. no specific criterion available
Explanation: An ampere-hour (A•h) is a unit of electric charge, representing the amount of charge transferred by a current of one ampere in one hour.
Correct answer: no specific criterion available- A. force that moves a charge past a point
- B. amount of charge that moves past a point per unit time
- C. resistance to the movement of a charge past a point
- D. energy used to move a charge past a point
Explanation: Current (I) is defined as the rate of flow of charge, i.e., I = ΔQ/Δt.
Correct answer: amount of charge that moves past a point per unit time- A. more heat is produced in the thick wire
- B. more heat is produced in the thin wire
- C. no heat is produced in the wire
- D. Equal heat in thick and thin wire
Explanation: According to the formula for electrical power (P = I²R), where R is the resistance, the thin wire will have higher resistance, resulting…
Correct answer: more heat is produced in the thin wire- A. 10C
- B. 5C
- C. 1C
- D. Insufficient data
Explanation: The charge (Q) flowing through a conductor is given by Q = I * t, where I is the current and t is the time.
Correct answer: 5C- A. 240 ohm
- B. 180 ohm
- C. 200 ohm
- D. 60 ohm
Explanation: Using Ohm's Law (R = V²/P), where R is resistance, V is voltage, and P is power, the resistance of the light bulb can be calculated as 240…
Correct answer: 240 ohm- A. 3,1,3
- B. 1,2,3
- C. All are the same
- D. 3,2,1
Explanation: Resistors are said to be connected in "Series", when they are daisy chained together in a single line.
Correct answer: All are the same- A. 1.6 x 10^-34 A
- B. 3.2 x 10^-34 A
- C. 1.6 x 10^-4 A
- D. 3.2 x 10^-4 A
Explanation: The current (I) caused by the motion of electrons in orbit is given by the formula I = frac{Q}{t}), where (Q) is the charge and (t) is the…
Correct answer: 1.6 x 10^-4 A- A. 12Ω
- B. 11/12 Ω
- C. 1/12 Ω
- D. 12/11 Ω
Explanation: Let R1 = 2Ω R2 = 4Ω R3 = 6ΩFor resistance connected in parallel combination, the equivalent resistance will be:1/Req = 1/R1 + 1/R2 +…
Correct answer: 12/11 Ω- A. Complex networks
- B. Wheatstone bridge
- C. potential divider
- D. all of the above
Explanation: A potential divider, or voltage divider, is a circuit that divides the voltage across its components, providing a continuously varying…
Correct answer: potential divider- A. source of e.m.f
- B. conductor
- C. Resistor
- D. capacitor
Explanation: Internal resistance refers to the resistance offered by the source of electromotive force (e.m.f), such as a battery.
Correct answer: source of e.m.f- A. 100W
- B. 200W
- C. 60W
- D. all
Explanation: The power of a bulb is related to the thickness of its filament. Higher power bulbs generally have thicker filaments to handle the…
Correct answer: 200W- A. watt x second
- B. volt x meter
- C. volt per coulomb
- D. Newton per meter
Explanation: The unit of energy is the watt-second (Ws) or joule (J), where 1 Joule = 1 Watt-second
Correct answer: watt x second- A. 1/45A
- B. 1/10A
- C. 1/5A
- D. 5A
Explanation: Given,Voltage = 2Vr1 = 30Ωr2 = 30Ωr3 = 30ΩTo find,The current in the circuitSolution,The current in the circuit shown in the figure is 0.1…
Correct answer: 1/10A- A. increase with rise in temperature
- B. decrease with rise in temperature
- C. will remain the same
- D. depends upon altitude of experimentation
Explanation: The resistance of a wire generally increases with an increase in temperature.
Correct answer: increase with rise in temperature- A. will depend on its length
- B. will depend on its radius
- C. will depend on the type of material of the wire
- D. depend on none of the above
Explanation: Specific resistance (or resistivity) (ρ) is a property of the material of the wire and is independent of its length or radius.
Correct answer: will depend on the type of material of the wire- A. 12
- B. 24
- C. 5
- D. 1100
Explanation: Power= 500W = O.5kWTime=24 hoursEnergy consumption (kwh) = power (kw) x time (h) =0.5 x 2412KW
Correct answer: 12