Start learning →

NEET UG Current Electricity — practice questions — page 3

Explore 163 free Current Electricity questions in NEET UG Physics. Open each question or exercise to read its content, reference answers and available explanation.

Practise Current Electricity with Quill →

Current Electricity questions and exercises with answers

Showing questions 61–90 of 163.

In a Wheatstone bridge, balance condition is:Read the answer and worked solution →Drift speed of electrons in a copper wire of cross-section A carrying current I is approximately:Read the answer and worked solution →EMF of a cell is defined as:Read the answer and worked solution →If a conductor of length l and cross-sectional area A has resistivity ρ, halving the length AND halving the area gives new resistanceRead the answer and worked solution →The drift velocity of electrons in a copper wire carrying steady current is of the order ofRead the answer and worked solution →A cell of emf ε and internal resistance r is connected to an external resistance R. The maximum power delivered to R isRead the answer and worked solution →In a Wheatstone bridge, arms have resistances P, Q, R, S in cyclic order with a galvanometer between the P-Q and R-S junctions. The bridge is balanced whenRead the answer and worked solution →A potentiometer of length L is used to compare emfs. If the balance lengths for cells of emf ε₁ and ε₂ are l₁ and l₂ respectively, then ε₁ / ε₂ equalsRead the answer and worked solution →Two cells of emf ε and internal resistance r each are connected in parallel. The equivalent emf and internal resistance areRead the answer and worked solution →Kirchhoff current law at a junction is a statement ofRead the answer and worked solution →A wire has a resistance R. It is stretched uniformly so that its length becomes 2L. The new resistance isRead the answer and worked solution →The relation between current density j, drift velocity v_d, number density n and charge e for a metallic conductor isRead the answer and worked solution →For a battery of emf ε and internal resistance r driving current I through external resistance R, the terminal voltage V equalsRead the answer and worked solution →Current electricity bingoRead the answer and worked solution →Pick the right unit or ruleRead the answer and worked solution →Complete the current lawsRead the answer and worked solution →Current electricity: true or false?Read the answer and worked solution →True or false: what emf actually isRead the answer and worked solution →Complete the statement of Ohm's lawRead the answer and worked solution →Tap every way Ohm's law can failRead the answer and worked solution →Match each device or material to its behaviourRead the answer and worked solution →Sort each material by its resistivityRead the answer and worked solution →Complete the resistance relationRead the answer and worked solution →True or false: resistance and resistivityRead the answer and worked solution →Match each of Kirchhoff's rules to what it conservesRead the answer and worked solution →Kirchhoff's rulesRead the answer and worked solution →Order the steps: find an unknown resistance with a Wheatstone bridgeRead the answer and worked solution →True or false: internal resistanceRead the answer and worked solution →Which quantity is which?Read the answer and worked solution →Assertion and reasonRead the answer and worked solution →

Worked practice questions

In a Wheatstone bridge, balance condition is:

  1. P/Q = R/S
  2. P · Q = R · S
  3. P + Q = R + S
  4. P/R = Q/S²
Show answer and solution

Correct answer: A. P/Q = R/S

1. At balance, galvanometer current = 0, so voltages at its two terminals are equal. 2. This gives the ratio condition P/Q = R/S. 3. Used in metre bridges to determine unknown resistance precisely. _Source: syllabus Physics Ch 3 §3.10 Wheatstone Bridge_

Open this question →

Drift speed of electrons in a copper wire of cross-section A carrying current I is approximately:

  1. Few cm s⁻¹
  2. Few m s⁻¹
  3. Few km s⁻¹
  4. Few mm s⁻¹
Show answer and solution

Correct answer: D. Few mm s⁻¹

1. Typical free-electron number density in Cu ≈ 8.5 × 10²⁸ m⁻³. 2. For I = 1 A in a 1 mm² wire, v_d = I/(n e A) ≈ 7 × 10⁻⁵ m s⁻¹ ≈ a few mm s⁻¹ at best, often much less. 3. Even though drift speed is tiny, electric signals (waves) travel at near light-speed through the wire. _Source: syllabus Physics Ch 3 §3.4 (drift-speed estimates)_

Open this question →

EMF of a cell is defined as:

  1. Work done per unit charge by the source
  2. Voltage drop across internal resistance
  3. Current per unit charge moved by source
  4. Power dissipated by source per second
Show answer and solution

Correct answer: A. Work done per unit charge by the source

1. EMF ε is the work the source does per coulomb of charge moved around the circuit (or measured open-circuit terminal voltage). 2. Even with no current, the cell maintains ε across its terminals. 3. SI unit: volt (J/C). _Source: syllabus Physics Ch 3 §3.8 EMF Definition_

Open this question →

How to practise

  1. Choose a Current Electricity question and try to work out your answer.
  2. Open the question to check the correct answer and read its worked solution.
  3. Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.

Put it into practice

Continue with Current Electricity practice for NEET UG. Read explanations as you go. No signup form needed to start.

Practise Current Electricity →

More Physics topics

Electric Charges and FieldsMoving Charges and MagnetismRay Optics and Optical InstrumentsSemiconductor ElectronicsDual Nature of Radiation and MatterKinetic Theory & OscillationsSystem of Particles and Rotational MotionThermal Properties of Matter & Thermodynamics