Uploaded study notes, PDF files, and supporting material related to Class 12th science topics.
Class 12th Science
Physics, Chemistry, and Biology notes in one guided space.
This page brings together Class 12th science materials, note text, and downloadable PDF resources so students can revise with a clearer structure and stronger exam focus.
Physics support
Chemistry revision
Biology practice
Open the PDF for questions or reading material, and use the note text cards as quick revision support.
Study Materials
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Notes and question resources for Class 12th
These items are pulled from the SSP uploaded study materials that match Class 12th, Physics, Chemistry, or Biology topics.
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Practice Zone
NCERT-style example practice for each subject
These are original practice questions inspired by Class 12th NCERT learning patterns, with short answers for self-checking.
Physics
Practice core ideas from electrostatics, current electricity, and ray optics.
Question 1
A point charge of 2 x 10^-6 C is placed 3 m away from another point charge of 4 x 10^-6 C in air. Find the electrostatic force between them.
Answer:
Use Coulomb's law: F = kq1q2 / r^2. Here k = 9 x 10^9, q1 = 2 x 10^-6 C, q2 = 4 x 10^-6 C, r = 3 m. So F = (9 x 10^9 x 8 x 10^-12) / 9 = 8 x 10^-3 N.
Question 2
More examples
A resistor of 10 ohm is connected to a 5 V battery. Calculate the current in the circuit.
Answer:
Using Ohm's law, I = V / R = 5 / 10 = 0.5 A.
Chemistry
Practice typical examples from solutions, electrochemistry, and organic naming basics.
Question 1
What is the molarity of a solution prepared by dissolving 5 g of NaOH in water to make 250 mL of solution?
Answer:
Molar mass of NaOH = 40 g/mol. Moles = 5 / 40 = 0.125 mol. Volume = 250 mL = 0.25 L. Molarity = 0.125 / 0.25 = 0.5 M.
Question 2
More examples
State whether oxidation or reduction occurs when Cu2+ changes to Cu.
Answer:
Cu2+ gains electrons to become Cu. Gain of electrons is reduction.
Biology
Practice concept-based questions from genetics, reproduction, and human health topics.
Question 1
Why is meiosis important in sexual reproduction?
Answer:
Meiosis reduces the chromosome number to half in gametes, so that after fertilization the normal chromosome number is restored in the offspring.
Question 2
More examples
Name the structure in flowering plants where pollen grains are produced, and state its role.
Answer:
Pollen grains are produced in the anther. Its role is to form and release the male gametophytes needed for fertilization.