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Physics · Class 12 · Experimental Skills

Experimental Skills (Physics Practicals) for JEE

Everything you need for this topic on one page: the ideas, the formulas, the traps, and free lectures that explain it well.

Last updated: 26 October 2026

Direct answer

The official list of experiments: vernier and screw gauge, simple pendulum, metre scale, Young's modulus, surface tension, viscosity, resonance tube, specific heat, Ohm's law, metre bridge, galvanometer, focal length, prism, and semiconductor characteristics.

The official list of experiments: vernier and screw gauge, simple pendulum, metre scale, Young's modulus, surface tension, viscosity, resonance tube, specific heat, Ohm's law, metre bridge, galvanometer, focal length, prism, and semiconductor characteristics.

Key ideas

Experimental Skills (Physics Practicals): what you must understand

  • Least count and zero error for vernier and screw gauge
  • Resonance tube gives speed of sound: v = 2f(l₂ − l₁)
  • Metre bridge: R/S = l/(100 − l)
  • u–v method for focal length
Formula sheet

Must-know formulas for Experimental Skills (Physics Practicals)

  • Vernier LC = 1 MSD − 1 VSD
  • Resonance tube end correction e = (l₂ − 3l₁)/2
  • Metre bridge X = R(100 − l)/l
  • Pendulum: g = 4π²L/T²
Print

One-page formula sheet

Printable Experimental Skills (Physics Practicals) formula sheet: formulas, key ideas and traps on one page. Save it as a PDF for offline revision.

Avoid

Common mistakes students make

  • Ignoring zero error sign
  • Forgetting end correction
  • Reading the wrong scale division
For the exam

How this topic is asked in JEE

Appears regularly; quick marks. Experimental Skills is an official unit and gives 1–2 quick questions. Use the units-and-errors chapter alongside it.

Prerequisites: Units, Dimensions and Errors.

NCERT map

Where Experimental Skills (Physics Practicals) is in NCERT

Chapter names follow the current rationalised NCERT textbooks. Read these sections before solving PYQs.

ClassBookChapterSections JEE asks from
Class 12Physics Part ICurrent ElectricityWheatstone Bridge; Metre Bridge; Kirchhoff's Rules; Resistivity of Various Materials
Class 11Physics Part IUnits and MeasurementSignificant Figures; Errors in Measurement; Accuracy and Precision of Measuring Instruments; Dimensions of Physical Quantities
Class 12Physics Part IIRay Optics and Optical InstrumentsRefraction through a Prism; Total Internal Reflection; Refraction at Spherical Surfaces and by Lenses
JEE Advanced level

A JEE Advanced-level example on Experimental Skills (Physics Practicals)

Question. In a metre bridge experiment, a standard resistance S = 10 Ω is connected in the left gap and an unknown resistance X in the right gap. The balance point is at 40 cm from the left end. However, the bridge wire has non-uniform cross-section such that the resistance per unit length varies linearly from 0.5 Ω/cm at the left end to 1.5 Ω/cm at the right end. Find the true value of X.

Show solution
  1. Resistance per unit length at distance x from left: r(x) = 0.5 + 0.01x Ω/cm
  2. Resistance of left segment (0 to 40 cm): R₁ = ∫₀⁴⁰(0.5 + 0.01x)dx = [0.5x + 0.005x²]₀⁴⁰ = 20 + 8 = 28 Ω
  3. Resistance of right segment (40 to 100 cm): R₂ = ∫₄₀¹⁰⁰(0.5 + 0.01x)dx = 100 − 28 = 72 Ω
  4. At balance in Wheatstone bridge: S/X = R₁/R₂
  5. Solving: X = S × (R₂/R₁) = 10 × (72/28) = 180/7 Ω

Answer: X = 180/7 Ω ≈ 25.7 Ω

This example was solved twice independently and both solutions agree.

Free lectures

Best free lectures for Experimental Skills (Physics Practicals)

Full-chapter free lectures picked from YouTube search results by views, from established JEE channels (mostly in Hinglish). Use the subtopic list to jump straight to the part you need (timestamps come from each video's own chapter list). Watch one, then solve PYQs the same day.

Practise

Where to practise for free

FAQs

Frequently asked questions

Is Experimental Skills (Physics Practicals) important for JEE Main 2027?

Appears regularly; quick marks. It is part of the official 'Experimental Skills' unit in the JEE Main 2027 syllabus.

What are the most important formulas in Experimental Skills (Physics Practicals)?

Vernier LC = 1 MSD − 1 VSD; Resonance tube end correction e = (l₂ − 3l₁)/2; Metre bridge X = R(100 − l)/l.

How should I study Experimental Skills (Physics Practicals) for JEE?

Understand the key ideas from NCERT or one full lecture, learn the formula sheet, then solve 25–30 past JEE questions on the topic. Experimental Skills is an official unit and gives 1–2 quick questions. Use the units-and-errors chapter alongside it.

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