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AIIMS UG Current Electricity — practice questions

Explore 43 free Current Electricity questions in AIIMS UG Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Current Electricity questions and exercises with answers

Showing questions 1–30 of 43.

Electric current is defined as the rate of flow of:Read the answer and worked solution →A resistor carries a current of 2 A when a potential difference of 10 V is applied across it. Its resistance is:Read the answer and worked solution →The SI unit of current density is:Read the answer and worked solution →For a uniform wire of resistance R = ρl/A, the resistivity ρ depends on:Read the answer and worked solution →The power dissipated in a resistor of resistance R carrying a steady current I is:Read the answer and worked solution →The emf of a cell is equal to the potential difference across its terminals when:Read the answer and worked solution →Estimate the drift speed of electrons in a copper wire carrying 1.5 A with cross-section 1.0×10⁻⁷ m² and n = 8.5×10²⁸ m⁻³ (e = 1.6×10⁻¹⁹ C):Read the answer and worked solution →Two cells, each of emf 1.5 V and internal resistance 0.5 Ω, are connected in series across a 2 Ω resistor. The current through the resistor is:Read the answer and worked solution →Two identical cells, each of emf 1.5 V and internal resistance 0.5 Ω, are connected in parallel across a 1 Ω resistor. The current through the resistor is:Read the answer and worked solution →The maximum current that can be drawn from a cell of emf 1.5 V and internal resistance 0.3 Ω is:Read the answer and worked solution →A Wheatstone bridge is balanced with arms P = 10 Ω, Q = 20 Ω and R = 15 Ω. The unknown resistance S is:Read the answer and worked solution →A 3 Ω resistor is connected in series with a parallel combination of a 6 Ω and a 3 Ω resistor. The equivalent resistance of the network is:Read the answer and worked solution →NEET · Physics · Kirchhoff's LawsRead the answer and worked solution →Ohm's law gives the relation between V, I, R as:Read the answer and worked solution →Resistance R of a wire depends on its length L, area A, and resistivity ρ as:Read the answer and worked solution →Resistivity of a typical metallic conductor as temperature increases:Read the answer and worked solution →A galvanometer of resistance G can be converted into a voltmeter of range V by connecting in series a high resistance R given by: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

Electric current is defined as the rate of flow of:

  1. mass
  2. electric charge
  3. energy
  4. voltage
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Correct answer: B. electric charge

I = dq/dt; charge per unit time.

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A resistor carries a current of 2 A when a potential difference of 10 V is applied across it. Its resistance is:

  1. 0.2 Ω
  2. 12 Ω
  3. 5 Ω
  4. 20 Ω
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Correct answer: C. 5 Ω

By Ohm's law R = V/I = 10/2 = 5 Ω.

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The SI unit of current density is:

  1. A
  2. A m²
  3. A m⁻²
  4. A m⁻¹
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Correct answer: C. A m⁻²

Current density j = I/A, so its SI unit is ampere per square metre, A m⁻².

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