NEB Class 12 Physics exam-day guide
NEB Class 12 Physics · Prepare for the day ahead.
Your checklist
Practical answer sheet / laboratory record book
Carry the same practical notebook or answer booklet your school has used for recording experiments during the year. Confirm with the provider (your school's science department) whether a fresh answer sheet is supplied at the exam centre or whether you must bring your own.
Admit card / registration slip
Bring the admit card or registration slip issued for the NEB examination. If you have not received it, ask your school's exam coordinator well before the practical date; do not assume a school ID card alone is accepted.
School ID card
Carry your school identity card as a secondary proof of identity. Whether it is mandatory in addition to the admit card should be confirmed with the provider.
Blue or black pen, pencil, eraser, sharpener, scale
Bring at least two working pens, a pencil for graphs and diagrams, an eraser, a sharpener, and a 15 cm ruler. Graph work and circuit diagrams are common in physics practicals, so a pencil and scale matter.
Simple scientific calculator
A non-programmable scientific calculator is normally needed for readings, log tables, and error calculations. Confirm with the provider whether programmable or graphing calculators are permitted; if unsure, bring the simplest non-programmable model.
Laboratory coat / apron (if your school requires it)
Many schools require an apron or lab coat for physics practicals. Ask your teacher in advance; this is a school-level requirement, so confirm with the provider.
Know your experiment list and viva topics
Revise the experiments performed during the year, their aim, apparatus, formula, circuit or ray diagram, sources of error, and precautions. Viva questions usually come from these experiments and from the related theory chapters.
Revise key formulas and graph shapes
Be ready to write the formula used, the expected graph (for example, a straight line through the origin for Ohm's law, or the shape of a resonance curve), and how to compute slope and intercept from a graph.
Practice reading instruments
Rehearse taking readings on a metre scale, vernier callipers, screw gauge, ammeter, voltmeter, and galvanometer. Know least count, zero error, and how to correct for zero error.
Reach the centre early
Arrive at the examination centre well before the reporting time so you can locate the laboratory and settle down. The exact reporting time is set by the provider; confirm it from your admit card or school notice.
Carry water and a light snack if allowed
Practical exams can run for several hours with waiting time. Confirm with the provider whether food and water are allowed inside the laboratory; keep the snack simple and unobtrusive.
Leave phone and smart devices at home or switched off
Most examination centres do not allow mobile phones or smart watches in the laboratory. Treat this as prohibited unless the provider explicitly says otherwise.
Plan the day
Go through your practical record book experiment by experiment. For each one, write down the aim, apparatus, formula, circuit or ray diagram, observation table format, and two precautions from memory, then check against your notes. Focus on the experiments most likely to be assigned, but do not skip any, since the allotment is usually by lottery or teacher choice.
Practice numerical work tied to the experiments: computing least count, correcting zero error, calculating slope from a graph, and combining readings with percentage error. Do three or four full calculations by hand with a calculator to build speed and accuracy.
Prepare for the viva. Write short answers to likely questions such as why a key is kept open while making circuit connections, why the wire should be uniform, why a voltmeter has high resistance, or why the lens formula sign convention matters. Say the answers aloud once.
Pack your kit early: pens, pencil, eraser, sharpener, scale, calculator, admit card, ID, and apron if required. Check the calculator battery and keep a spare pen. Confirm the reporting time and venue with your school.
Do a light revision only: formula sheet, graph shapes, precautions, and sources of error. Do not start a new experiment or a new chapter the night before.
Lay out clothes, admit card, ID, stationery, calculator, and lab coat in one place. Sleep at a normal hour; a practical exam rewards steady hands and clear reading more than last-minute cramming.
Reconfirm the reporting time, the exact laboratory or block, and whether you must bring your own answer booklet. If anything is unclear, contact your school coordinator rather than guessing.
Eat a proper breakfast and reach the centre early. Keep the admit card and ID accessible for verification at the entrance.
Once seated, listen carefully to the instructions and read the experiment allotted to you fully before touching the apparatus. Note the least count of every instrument you will use.
Set up the apparatus neatly, check for zero error, and take a few trial readings before recording the final observation table. Write readings clearly with correct units and significant figures, and never overwrite a wrong reading; strike it out and write the corrected value.
Draw circuit or ray diagrams with a pencil and scale, label everything, and mark the direction of current or the path of rays. Plot graphs on graph paper with labelled axes, a suitable scale, and plotted points clearly marked.
Show the calculation steps, including the formula, substitution, and final result with units. Add a short precautions and sources-of-error section, then answer viva questions calmly and honestly; if you do not know, say so and reason from what you do know.
Before leaving the laboratory, check that your name and roll number are on every sheet, that all pages are numbered and attached, and that you have handed in everything the invigilator asked for.
Rules to check
Carry and display your admit card and identity proof when asked. If you are unsure which documents are accepted, confirm with the provider before the exam day.
Follow the invigilator's instructions on seating, apparatus allotment, and timing. Do not exchange apparatus, readings, or answer sheets with other candidates.
Mobile phones, smart watches, and unauthorised electronic devices are generally not allowed in the laboratory. Confirm with the provider whether any exception exists; otherwise leave them outside.
Handle apparatus and chemicals carefully and follow all safety instructions. Report breakage or a faulty instrument to the invigilator immediately instead of trying to fix it yourself.
Take breaks or leave the laboratory only with the invigilator's permission. The rules on leaving the hall during the practical are set by the provider, so ask before the exam begins.
Marks for practical work normally come from the experiment performed, the record book, the viva, and sometimes the project. The exact weightage and pass requirements are set by NEB; confirm the current scheme with your school.
Write your answers in your own words and show your working. Copying another candidate's readings or answer sheet is misconduct and can lead to cancellation.
If you have a genuine problem such as a faulty instrument, poor lighting, or a medical issue, tell the invigilator at once so it can be recorded and addressed.