How to solve Physics numericals step by step (CBSE Class 12)
Most lost marks in numericals come from the setup, not the maths. A five-step routine you can use in every board-exam question.
Board Exam & Sample Paper MasteryCBSEPhysics4 min read
A numerical looks hard when you start with the formula. It gets easier when you start with the situation. This routine works for most Class 12 Physics numericals, from electrostatics to optics.
1. Draw it and list what you know
Sketch the situation, label every quantity and write the given values with their units. Convert units straight away, for example cm to m or µF to F, so you do not carry mistakes through the working.
2. Say what you need to find
Write the unknown clearly. Then ask which law or relationship connects the unknown to what you are given. If you cannot name the law, the problem is concepts, not calculation.
3. Write the formula first, then substitute
Board examiners give marks for the correct formula and for correct substitution. Write the formula in symbols, rearrange it, and only then put numbers in.
4. Check the answer
- Does the unit make sense for the quantity?
- Is the size believable? A speed faster than light or a negative mass means a slip.
- Did you answer the question that was asked?
5. Practise in the right order
Work through the NCERT examples and exercises first, then previous-year board questions. Keep a short list of the formulas you forget, and revise it before every test.
If numericals still feel stuck after this, a one-to-one session can show exactly where the setup goes wrong.