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 2 of 5
- A. shunt value decreases
- B. shunt value increases
- C. shunt value remains the same
- D. none of the above
Explanation: For a higher ammeter range, more current must bypass the galvanometer, so a smaller shunt resistance is connected in parallel.
Correct answer: shunt value decreases- A. galvanometer
- B. voltmeter
- C. ammeter
- D. AC transformer and DC generator
Explanation: A galvanometer, ammeter and voltmeter are electromechanical measuring instruments because current produces mechanical motion or…
Correct answer: AC transformer and DC generator- A. zero
- B. equal to the restoring couple
- C. greater than the restoring couple
- D. smaller than the restoring couple
Explanation: At equilibrium, the net torque is zero, so the deflecting couple and restoring couple must be equal in magnitude and opposite in…
Correct answer: equal to the restoring couple- A. AA. voltmeter
- B. galvanometer
- C. cathode ray oscilloscope (CRO)
- D. ammeter
Explanation: A CRO has a very high input resistance, so it can measure potential difference while drawing an almost negligible current from the…
Correct answer: cathode ray oscilloscope (CRO)- A. negative charges
- B. positive charges
- C. both negative and positive charges
- D. neutral particles
Explanation: In liquids and ionized gases, both positive ions and negative ions move and contribute to electric current, with conventional current…
Correct answer: both negative and positive charges- A. same current
- B. same current and potential difference
- C. different current but same potential difference
- D. different current and potential differences
Explanation: Parallel appliances are connected across the same two points, so each receives the same potential difference, while the current differs…
Correct answer: different current but same potential difference- A. 3600C
- B. 7200C
- C. 1C
- D. 2C
Explanation: Charge flow is Q = It, so Q = 1 A x 3600 s = 3600 C in one hour. The 2 m length is irrelevant because current already gives charge flow…
Correct answer: 3600C- A. complex network
- B. wheat stone bridge
- C. potential divider
- D. all of above
Explanation: A potential divider uses series resistors to provide an adjustable fraction of the supply potential, giving a continuously varying output…
Correct answer: potential divider- A. Joule effect
- B. Joule Thomsons effect
- C. Comptons effect
- D. Feed back effect
Explanation: The heating of a conductor by current is called the Joule effect, described by the relation H = I²Rt, where heat is produced because…
Correct answer: Joule effect- A. free electrons
- B. protons
- C. neutrons
- D. still under controversy
Explanation: In a metallic conductor, the mobile charge carriers are free electrons, which drift through the lattice when an electric field is applied.
Correct answer: free electrons- A. I2/Rt
- B. I2Rt
- C. I2/R/t
- D. IR2t
Explanation: Work done when an electric charge Q moves against a potential difference is given by,W=QxVSince current is I=Q/tQ=IxtBy ohm's law…
Correct answer: I2Rt- A. becomes zero
- B. doubles
- C. remain the same
- D. changes the sign
Explanation: When the hot and cold junctions of a thermocouple are interchanged, the thermo-electromotive force (EMF) changes sign.
Correct answer: changes the sign- A. 1%
- B. 2%
- C. 4%
- D. 0.5%
Explanation: Here is the explanation of the correct option = I2 RIf the current changes by 1% then new current will be:I/ = I x (1 - 1/100)=I x 0.99P/…
Correct answer: 2%- A. Electric flux
- B. Electric Potential
- C. Electric current
- D. Resistance
Explanation: The correct answer is Electric current. It is defined as the rate at which electric charge flows through a conductor.
Correct answer: Electric current- A. ammetre.
- B. voltmetre.
- C. ohmmetre.
- D. photometre.
Explanation: A) Ammeter: A galvanometer is a sensitive device that detects and measures small electric currents.
Correct answer: ammetre.- A. current.
- B. voltage.
- C. resistance.
- D. electric flux.
Explanation: Electric flux (option D) is a measure of the electric field passing through a given area.
Correct answer: electric flux.- 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