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Current Electricity

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Q. If the galvanometer in a Wheatstone bridge shows a deflection, what does it indicate?
  • A. The bridge is balanced.
  • B. The bridge is unbalanced.
  • C. The resistances are equal.
  • D. The circuit is open.
Q. If the galvanometer shows a deflection in a Wheatstone bridge, what can be inferred?
  • A. The bridge is balanced
  • B. The bridge is unbalanced
  • C. The resistances are equal
  • D. The circuit is open
Q. If the galvanometer shows a deflection when the Wheatstone bridge is not balanced, what does it indicate?
  • A. The bridge is balanced
  • B. The resistances are equal
  • C. There is a potential difference
  • D. The circuit is open
Q. If the internal resistance of a cell is negligible, how does it affect the accuracy of a potentiometer measurement?
  • A. It increases accuracy
  • B. It decreases accuracy
  • C. It has no effect
  • D. It makes the measurement impossible
Q. If the known voltage in a potentiometer is 12 V and the length of the wire is 6 m, what is the potential gradient?
  • A. 2 V/m
  • B. 3 V/m
  • C. 4 V/m
  • D. 6 V/m
Q. If the length of a wire is doubled while keeping the cross-sectional area constant, how does its resistance change?
  • A. Remains the same
  • B. Doubles
  • C. Halves
  • D. Quadruples
Q. If the length of the potentiometer wire is increased while keeping the voltage constant, what will happen to the balance point when measuring a cell's EMF?
  • A. It will move to a longer length.
  • B. It will move to a shorter length.
  • C. It will remain unchanged.
  • D. It will become unstable.
Q. If the length of the potentiometer wire is increased, what effect does it have on the maximum measurable voltage?
  • A. It increases
  • B. It decreases
  • C. It remains the same
  • D. It becomes zero
Q. If the resistance in a circuit is doubled while keeping the voltage constant, what happens to the current?
  • A. It doubles.
  • B. It halves.
  • C. It remains the same.
  • D. It quadruples.
Q. If the resistance in one arm of a Wheatstone bridge is increased, what effect does it have on the balance condition?
  • A. The bridge will always remain balanced.
  • B. The bridge will become unbalanced.
  • C. The balance condition will improve.
  • D. It has no effect.
Q. If the resistance in one arm of a Wheatstone bridge is increased, what happens to the balance condition?
  • A. It remains balanced
  • B. It becomes unbalanced
  • C. It depends on other resistances
  • D. It becomes short-circuited
Q. If the resistance of a circuit is doubled while the voltage remains constant, what happens to the current?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. If the resistance of a wire is doubled, how does it affect the current flowing through it when connected to a constant voltage source?
  • A. Current doubles
  • B. Current halves
  • C. Current remains the same
  • D. Current quadruples
Q. If the resistance of a wire is doubled, what happens to the current flowing through it if the voltage remains constant?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. If the resistance of a wire is doubled, what happens to the current flowing through it when the voltage remains constant?
  • A. Doubles
  • B. Halves
  • C. Remains the same
  • D. Increases by 50%
Q. If the resistance of one arm of a Wheatstone bridge is increased, what effect does it have on the balance condition?
  • A. It remains balanced
  • B. It becomes unbalanced
  • C. It depends on the other resistances
  • D. It increases the current
Q. If the resistance of one arm of a Wheatstone bridge is increased, what will happen to the balance condition?
  • A. The bridge will remain balanced
  • B. The bridge will become unbalanced
  • C. The bridge will balance at a different point
  • D. The bridge will short circuit
Q. If the resistance of one of the arms in a Wheatstone bridge is increased, what effect does it have on the balance condition?
  • A. The bridge remains balanced.
  • B. The bridge becomes unbalanced.
  • C. The current through the galvanometer increases.
  • D. The potential difference across the galvanometer decreases.
Q. If the resistance of one of the resistors in a Wheatstone bridge is changed, what will happen to the balance condition?
  • A. It will remain unchanged.
  • B. It will become balanced.
  • C. It will become unbalanced.
  • D. It will depend on the value of the changed resistor.
Q. If the resistance of the potentiometer wire is increased, what effect does it have on the potential gradient?
  • A. It increases.
  • B. It decreases.
  • C. It remains the same.
  • D. It becomes zero.
Q. If the resistance of the potentiometer wire is increased, what effect does it have on the measurement accuracy?
  • A. Increases accuracy
  • B. Decreases accuracy
  • C. No effect
  • D. Depends on the length of the wire
Q. If the resistance P in a Wheatstone bridge is 10 ohms, Q is 15 ohms, R is 5 ohms, and S is 7.5 ohms, what is the condition for the bridge to be balanced?
  • A. P/Q = R/S
  • B. P/R = Q/S
  • C. P/S = Q/R
  • D. P + Q = R + S
Q. If the resistance R1 in a Wheatstone bridge is increased, what effect does it have on the balance condition?
  • A. The bridge becomes balanced
  • B. The bridge becomes unbalanced
  • C. No effect
  • D. Depends on other resistances
Q. If the resistance R1 in a Wheatstone bridge is increased, what happens to the balance condition?
  • A. The bridge remains balanced
  • B. The bridge becomes unbalanced
  • C. The bridge becomes balanced again
  • D. The current through the galvanometer increases
Q. If the resistance R1 in a Wheatstone bridge is increased, what happens to the current through the galvanometer?
  • A. It increases.
  • B. It decreases.
  • C. It remains the same.
  • D. It becomes zero.
Q. If the resistance R1 is increased in a Wheatstone bridge, what happens to the balance condition?
  • A. It remains balanced
  • B. It becomes unbalanced
  • C. It depends on R2
  • D. It depends on R3 and R4
Q. If the resistance R2 in a Wheatstone bridge is halved, what effect does it have on the balance condition?
  • A. The bridge remains balanced
  • B. The bridge becomes unbalanced
  • C. The bridge becomes balanced again
  • D. The current through the galvanometer decreases
Q. If the resistance R4 in a Wheatstone bridge is decreased, what effect does it have on the balance condition?
  • A. The bridge becomes balanced
  • B. The bridge becomes unbalanced
  • C. The current through the galvanometer decreases
  • D. The voltage across R1 increases
Q. If the resistance values in a Wheatstone bridge are all equal, what can be inferred about the bridge?
  • A. It is always balanced.
  • B. It is always unbalanced.
  • C. The current through the galvanometer is zero.
  • D. The potential difference across the galvanometer is maximum.
Q. If the resistance values in a Wheatstone bridge are all equal, what can be said about the bridge?
  • A. It is always balanced
  • B. It is always unbalanced
  • C. It depends on the circuit configuration
  • D. It cannot be determined
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Current Electricity MCQ & Objective Questions

Current Electricity is a crucial topic in physics that students must master for their exams. Understanding this concept not only helps in grasping fundamental principles but also significantly boosts your performance in objective questions. Practicing MCQs and important questions related to Current Electricity can enhance your exam preparation and increase your chances of scoring higher marks.

What You Will Practise Here

  • Ohm's Law and its applications
  • Series and parallel circuits
  • Electrical power and energy calculations
  • Resistance, resistivity, and factors affecting resistance
  • Kirchhoff's laws and their practical applications
  • Concept of current, voltage, and their relationship
  • Diagrams and circuit analysis techniques

Exam Relevance

The topic of Current Electricity is frequently tested in various examinations, including CBSE, State Boards, NEET, and JEE. Students can expect questions that assess their understanding of fundamental concepts, application of formulas, and problem-solving skills. Common question patterns include numerical problems, theoretical questions, and circuit analysis, making it essential to be well-prepared with Current Electricity MCQ questions.

Common Mistakes Students Make

  • Confusing current with voltage and their units
  • Misapplying Ohm's Law in complex circuits
  • Overlooking the effects of temperature on resistance
  • Failing to differentiate between series and parallel connections
  • Neglecting to draw circuit diagrams for better understanding

FAQs

Question: What is the formula for calculating electrical power?
Answer: The formula for electrical power is P = VI, where P is power, V is voltage, and I is current.

Question: How does resistance change in series and parallel circuits?
Answer: In series circuits, total resistance increases, while in parallel circuits, total resistance decreases.

Now is the time to enhance your understanding of Current Electricity! Dive into our practice MCQs and test your knowledge to ensure you are well-prepared for your exams. Start solving today and boost your confidence!

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