Free Steady Current MCQs with Answers
87 Steady Current 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 is the continuous flow of charge at a constant rate through a conductor. The topic covers current, charge, potential difference, resistance, Ohm's law, resistivity and electrical power, along with series and parallel circuits, while distinguishing conventional current direction from electron motion.
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87 questions · page 4 of 5
- A. Same
- B. Different
- C. Sometimes same, sometimes different
- D. None of them
Explanation: In a series circuit, the current only has one path to flow through and so, the current must be the same at all points so, as to follow the…
Correct answer: Same- 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 current68. 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 A70. What is the current in a 2 x 10^6 ohms resistor having a potential difference of 6 x 10^-3 volts?
- A. 1 x 10^-3 A
- B. 2 x 10^-3 A
- C. 3 x 10^-3 A
- D. 4 x 10^-3 A
Explanation: We know according to ohm's law.V=IRI = V/RPutting valuesWe get answer3×10-3 A
Correct answer: 3 x 10^-3 A71. What is the current in a 2 x 10^6 ohms resistor having a potential difference of 6 x 10^3 volts?
- A. 1 x 10^-3 A
- B. 2 x 10^-3 A
- C. 3 x 10^-3 A
- D. 4 x 10^-3
Explanation: According to Ohm's Law V=IR Since V= 6x103 Volts R= 2 x 106 ohms Hence; I=V/R; I = 6x103 / 2x106 = 3x10-3 Ampere (so option C is the…
Correct answer: 3 x 10^-3 A- A. One ampere
- B. Two ampere
- C. 1.6x 10+19 amperes
- D. 1.6 x 10^-19 amperes
Explanation: I = Q/t = Ne/t = 2 x 1.6 x 10-19 / 2 = 1.6 x 10-19 A. Therefore, D is the correct answer.
Correct answer: 1.6 x 10^-19 amperes- A. Kirchholf's 1st law
- B. Wheatstone bridge
- C. Combination of resistance
- D. Kirchholf's 2nd law
Explanation: Wheatstone Bridge: The Wheatstone bridge is a circuit arrangement consisting of four resistive elements connected in a diamond shape.
Correct answer: Wheatstone bridge- A. Current
- B. Time
- C. Quantity of charge
- D. Power
Explanation: Quantity of charge: This option is correct. Ampere hour is a unit of the quantity of charge, representing the total charge transported by…
Correct answer: Quantity of charge- A. Same current
- B. Same power
- C. Different potential and same current
- D. Same potential difference
Explanation: In a parallel circuit, each appliance is connected directly to the main line and the neutral line, creating individual pathways for the…
Correct answer: Same potential difference- A. voltage of battery
- B. power of battery
- C. e.m.f of battery
- D. all of these
Explanation: EMF is the source of voltage in a battery responsible for flow of charges through a circuit.
Correct answer: e.m.f of battery- A. 3.21 × 10^18
- B. 2.2 × 10^16
- C. 1.602 × 10^19
- D. 6.42 × 10^18
Explanation: To find the number of electrons involved in a current of 1 A, we use the formula:I = n × ewhere I is the current (1 A), n is the number of…
Correct answer: 6.42 × 10^18- A. Resistance and resistivity
- B. Conductivity and resistivity
- C. Electromotive force and potential difference
- D. Resistivity and temperature coefficient of resistivity
Explanation: The correct answer is Option C: Electromotive force and potential difference. Both are measured in volts (V) and have the same dimensions.
Correct answer: Electromotive force and potential difference- A. Their bodies have high resistance
- B. Their feet are good insulators
- C. There is a negligible potential difference between their feet
- D. Wires are insulated
Explanation: Birds perched on an overhead transmission line are not harmed because both of their feet are at the same electrical potential, eliminating…
Correct answer: There is a negligible potential difference between their feet- A. Charge
- B. Energy
- C. Mass
- D. Momentum
Explanation: Kirchhoff's first law is a manifestation of law of conservation of charge, if there is no sink or source of charge at a point, the total…
Correct answer: Charge