Must Do Experiments to Ace CBSE 12th Physics Practical Exam 2026

Experiments

Activities

To determine the resistivity of two / three wires by plotting a graph for potential difference versus current.

To measure the resistance and impedance of an inductor with or without an iron core.

To find the resistance of a given wire / standard resistor using a metre bridge.

To measure resistance, voltage (AC/DC), current (AC) and check the continuity of a given circuit using a multimeter.

To verify the laws of combination (series) of resistances using a metre bridge.

OR

To verify the laws of combination (parallel) of resistances using a metre bridge.

To assemble a household circuit comprising three bulbs, three (on/off) switches, a fuse and a power source.

To determine the resistance of a galvanometer by the half-deflection method and to find its figure of merit.

To assemble the components of a given electrical circuit.

To convert the given galvanometer (of known resistance and figure of merit) into a voltmeter of the desired range and to verify the same.

OR

To convert the given galvanometer (of known resistance and figure of merit) into an ammeter of the desired range and to verify the same.

To study the variation in potential drop with the length of a wire for a steady current.

To find the frequency of AC mains with a sonometer.

To draw the diagram of a given open circuit comprising at least a battery, resistor/rheostat, key, ammeter and voltmeter. Mark the components that are not connected in proper order, and correct the circuit and also the circuit diagram.

Experiments

Activities

To find the value of v for different values of u in the case of a concave mirror, and to find the focal length.

To identify a diode, an LED, a resistor and a capacitor from a mixed collection of such items.

To find the focal length of a convex mirror, use a convex lens.

Use of a multimeter to see the unidirectional flow of current in case of a diode and an LED, and check whether a given electronic component (e.g., diode) is in working order.

To find the focal length of a convex lens by plotting graphs between u and v or between 1/u and 1/v.

To study the effect of the intensity of light (by varying the distance of the source) on an LDR.

To find the focal length of a concave lens, use a convex lens.

To observe refraction and lateral deviation of a beam of light incident obliquely on a glass slab.

To determine the angle of minimum deviation for a given prism by plotting a graph between the angle of incidence and the angle of deviation.

To observe the diffraction of light due to a thin slit.

To determine the refractive index of a glass slab using a travelling microscope.

To study the nature and size of the image formed by a (i) convex lens, or (ii) concave mirror, on a screen by using a candle and a screen (for different distances of the candle from the lens/mirror).

To find the refractive index of a liquid using a convex lens and a plane mirror.

To obtain a lens combination with the specified focal length by using two lenses from the given set of lenses.

To find the refractive index of a liquid using a concave mirror and a plane mirror.

To draw the I-V characteristic curve for a p-n junction diode in forward and reverse bias.

Evaluation Scheme

Marks

Two experiments, one from each section

7+7 Marks

Practical record [experiments and activities]

5 Marks

One activity from any section

3 Marks

Investigatory Project

3 Marks

Viva on experiments, activities and projects

5 Marks

Total

30 marks