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AIIMS UG Physics — practice by topic

Browse 43 questions across 2 Physics topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Physics topics

Current Electricity (43)Optics (1)

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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 →

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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