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 51 of 53
- 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: Explanation:The deviation of an I-V graph from a straight line is due to the fact that the resistance of a material changes with…
Correct answer: Increase in temperature and increase in resistance- A. R
- B. R/3
- C. 3R
- D. R3
Explanation: The resistors are connected in series so their equivalent resistance would be the sum of resistances of all resistors.R+R+R=3R.
Correct answer: 3R- A. 1000 Ω
- B. 100 Ω
- C. 1 Ω
- D. 10 Ω
Explanation: Given data Area, A= 1mm2 Resistivity, ρ= 10-6Ωm Thickness, x= 10-6m Now we have Resistance, R=ρl/A where A= = length (l) x thickness (x)…
Correct answer: 1 Ω- A. 5.6 Ω
- B. 3.33 Ω
- C. 0.33 Ω
- D. 6.6 Ω
Explanation: The total resistance can be found by using the method of successive reduction, as shown below
Correct answer: 6.6 Ω- A. 1.5A
- B. 3A
- C. 4.5A
- D. 6A
Explanation: Firstly, we'll calculate the resistance of the carbon resistor by using the formula Voltage= Current x Resistance.
Correct answer: 3A- A. 2 Ohms
- B. 6 Ohms
- C. 3 Ohms
- D. 4 Ohms
Explanation: Resistor AD and DC are in series For series combination: Re=R1+R2 =AD+DC =3ohm+3ohm =6ohm, this is in parallel combination with resistor…
Correct answer: 2 Ohms- A. First.
- B. Second.
- C. Third.
- D. None of these.
Explanation: KVL, Kirchoff's voltage law or Kirchoff's loop rule states that within a closed loop containing multiple emf sources and resistors, their…
Correct answer: Second.- A. Heat energy into Electrical energy
- B. Chemical energy into Electrical energy
- C. Solar energy into Electrical energy
- D. Mechanical energy into Electrical energy
Explanation: Explanation:The energy supplied by the cell to the charge carriers is derived from the conversion of chemical energy into electrical…
Correct answer: Chemical energy into Electrical energy- A. 5 Ω
- B. 2 Ω
- C. 3 Ω
- D. 4 Ω
Explanation: Explanation: Galvanometer resistance = G = 20Ω Current = I1 = 10A Current = I2 = 2 A Shunt resistance = Rs = ?So, n = I1 / I2 n = 10 / 2 =…
Correct answer: 5 Ω- A. At an angle of 180° with the galvanometer
- B. Parallel with the galvanometer
- C. At an angle of 45° with the galvanometer
- D. Perpendicular to the galvanometer
Explanation: Explanation:The current measuring part of an ammeter consists of a low resistance connected in parallel with the galvanometer.
Correct answer: Parallel with the galvanometer- A. Internal structure of OP-AMP
- B. Externally connected resistance
- C. Voltage of power supplies
- D. Input resistance
Explanation: The correct answer is B: Externally connected resistance. The closed loop gain of an OP-AMP is determined by the feedback network, which…
Correct answer: Externally connected resistance- A. Electronic current
- B. Electric current
- C. Magnetic lines
- D. Conventional current
Explanation: The correct answer is D: Conventional current. Conventional current is defined by the direction in which positive charges would flow, from…
Correct answer: Conventional current1013. 2.00 x 10^6 e passing through a conductor in 1 millisecond. Electric current through conductor is:
- A. 3.2 x 10^-10 A
- B. 32.0 x 10^-9 A
- C. 320 x 10^-10 A
- D. 0.320 x 10^-10
Explanation: Charge on an electron is 1.6x10-¹⁹CWhat will be the total charge on n number of electrons?In this case, n=2x10⁶ electrons E=neWhere e is…
Correct answer: 3.2 x 10^-10 A- A. 1 A
- B. 1.5 A
- C. 5 A
- D. 6 A
Explanation: Given: Voltage = V = 3V Resistance = R = 2Ω Current = I = ? As we know that: V = IR I = V / R = 3 / 2 I = 1.5 A
Correct answer: 1.5 A- A. -0.01
- B. -1/273
- C. 0.01
- D. 1/273
Explanation: (The mcq option seem incorrrect, the only explanation possible is as follows;)Given that,Resistance at 0°C = 100ΩResistance at 100°C =…
Correct answer: 0.01- A. Ohm
- B. Ohm-meter-1
- C. Ohm - meter
- D. mho
Explanation: The SI unit for conductance is siemen or mho. This is also written as 1/ohm or ohm-1.
Correct answer: mho- A. 25 ohm
- B. 50 ohm
- C. 75 ohm
- D. 100 ohm
Explanation: In a balanced Wheatstone bridge, the ratio of the resistances in one arm is equal to the ratio of the resistances in the other arm…
Correct answer: 50 ohm- A. Metallic conductor
- B. Transistors
- C. Diodes
- D. Electric arcs
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: Metallic conductor- A. 100Ω
- B. 200Ω
- C. 50Ω
- D. 150Ω
Explanation: The resistance R of a wire is given by the formula: R = ρL/A, where ρ is the resistivity, L is the length, and A is the cross-sectional…
Correct answer: 200Ω- A. Low resistance in comparison to circuit resistance
- B. High resistance in comparison to circuit resistance
- C. A resistance equal to circuit resistance
- D. None of the above
Explanation: High resistance in comparison to circuit resistance: This is the correct option.
Correct answer: High resistance in comparison to circuit resistance