CBSE Physics Practicals for Class 12

CBSE Class 12 Physics Experiments

Section A
1. To determine the resistivity of two / three wires by plotting a graph for potential difference versus current.
2. To find the resistance of a given wire / standard resistor using a metre bridge.
3. 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.
4. To determine the resistance of a galvanometer by the half-deflection method and to find its figure of merit.
5. To convert the given galvanometer (of known resistance and figure of merit) into a voltmeter of desired range and to verify the same.
OR
To convert the given galvanometer (of known resistance and figure of merit) into an ammeter of desired range and to verify the same.
6. To find the frequency of AC mains with a sonometer
Section B
1. To find the value of v for different values of u in the case of a concave mirror and to find the focal length.
2. To find the focal length of a convex mirror using a convex lens.
3. To find the focal length of a convex lens by plotting graphs between u and v or between 1/u and 1/v.
4. To find the focal length of a concave lens using a convex lens.
5. 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.
6. To determine the refractive index of a glass slab using a travelling microscope.
7. To find the refractive index of a liquid using a convex lens and plane mirror.
8. To find the refractive index of a liquid using a concave mirror and a plane mirror.
9. To draw the I-V characteristic curve for a p-n junction diode in forward and reverse bias.

CBSE Chemistry Practicals for Class 12

The experiments have been divided into two sections:

Section A and Section B.

The experiments mentioned in Section B are mandatory.

SECTION- A

A Surface Chemistry

1 Preparation of one lyophilic and one lyophobic sol – starch, egg albumin and gum

2 Preparation of one lyophobic sol– Ferric hydroxide

B Chromatography

Separation of pigments from extracts of leaves and flowers by paper chromatography and determination of Rf values (distance values may be provided).

C Tests for the functional groups present in organic compounds:

(1) Alcoholic and Carboxylic groups.

(2) Aldehydic and Ketonic

D Characteristic tests of carbohydrates and proteins in the given foodstuffs.
E Preparation of Inorganic Compounds- Potash Alum

SECTION-B (Mandatory)

F Quantitative analysis

(1) (a) Preparation of the standard solution of Oxalic acid of a given volume

(b) Determination of molarity of KMnO4 solution by titrating it against a standard solution of Oxalic acid.

(2) The above exercise [F 1 (a) and (b)] to be conducted using Ferrous ammonium sulphate (Mohr’s salt)

G Qualitative analysis:

(1) Determination of one cation and one anion in a given salt.

Cation –NH4+ 

Anions – CO32- , S2- , SO32- , Cl– , CH3COO– 

(Note: Insoluble salts excluded)

Note: The above practical may be carried out in an experiential manner rather than recording observations.

CBSE Biology Practicals for Class 12

Below you will find the list of experiments for Biology practicals.

A. List of experiments
1. Prepare a temporary mount to observe pollen germination.
2. Study the plant population density by quadrat method.
3. Study the plant population frequency by quadrat method.
4. Prepare a temporary mount of the onion root tip to study mitosis.
5. Isolate DNA from available plant material such as spinach, green pea seeds, papaya, etc.
B. Study and observe the following (Spotting)
1. Flowers adapted to pollination by different agencies (wind, insects, birds).
2. Pollen germination on stigma through a permanent slide or scanning electron micrograph.
3. Identification of stages of gamete development, i.e., T.S. of testis and T.S. of ovary through permanent slides (from grasshopper/mice).
4. Meiosis in onion bud cells or grasshopper testis through permanent slides.
5. T.S. of blastula through permanent slides (Mammalian).
6. Mendelian inheritance using seeds of different colours/sizes of any plant.
7. Prepared pedigree charts of any one of the genetic traits such as rolling of tongue, blood groups, ear lobes, widow’s peak and colour blindness.
8. Controlled pollination – emasculation, tagging and bagging.
9. Common disease-causing organisms like Ascaris, Entamoeba, Plasmodium, and any fungus causing ringworm through permanent slides, models or virtual images or specimens. Comment on symptoms of diseases that they cause.
10. Models specimen showing symbolic association in root modules of leguminous plants, Cuscuta on host and lichens.
11. Flashcard models showing examples of homologous and analogous organs.

 

The practical exam for CBSE Class 12 Biology is composed of 30 marks. Students should try to score well in the practical exam as it can improve their overall score in the board examination. Students must have a thorough knowledge of the theoretical concepts before performing the experiments. This would help them to understand the fundamental concepts more efficiently.