CBSE Practical Exams 2026: Guidelines, Dates & Scoring Tips

While theory exams get most attention, CBSE practical exams carry significant weightage and can boost your overall percentage. For Science stream students especially, practicals account for 20-30 marks per subject. This comprehensive guide covers everything about CBSE practical exams 2026.

Understanding CBSE Practical Exams

Subjects with Practical Components

Class 10:

• Science: 20 marks (out of 100 total)
• Mathematics: 20 marks (out of 100 total) - Internal Assessment including practicals
• Computer Applications/IT: 50 marks (out of 100 total)
• Foundation of Information Technology: 40 marks (out of 100 total)

Class 12:

• Physics: 30 marks
• Chemistry: 30 marks
• Biology: 30 marks
• Computer Science: 30 marks
• Physical Education: 30 marks
• Other vocational subjects: 30-40 marks

Practical Exam Schedule 2026

Class 10 Practicals:

• Dates: Typically conducted in January-February 2026
• Duration: Before theory exams begin
• Conducted by: Own school teachers with external examiner supervision

Class 12 Practicals:

• Dates: January-February 2026
• External Examiner: Appointed by CBSE
• More formal than Class 10 practicals

Note: Exact dates announced by individual schools. Check with your school office.

Science Practical Exam (Class 10) - 20 Marks

Marks Distribution

Total: 20 marks

1. Practical Exam (Experiments): 10 marks

- 2 experiments (5 marks each)

2. Practical Record/Lab Manual: 5 marks

- Neatly maintained practical file

3. Viva Voce (Oral Test): 5 marks

- Questions based on experiments and theory

List of Experiments to Prepare

Physics Experiments (Practice All)

1. Ohm's Law - Relationship between V and I

2. Resistors in Series - Combined resistance

3. Resistors in Parallel - Combined resistance

4. Focal Length of Concave Mirror - Using parallel rays

5. Focal Length of Convex Lens - Using distant object

6. Tracing Path of Ray through Glass Slab

7. Image Formation by Concave/Convex Mirror

8. Image Formation by Concave/Convex Lens

Chemistry Experiments (Practice All)

1. pH of Solutions - Using pH paper/universal indicator

- Test: HCl, NaOH, NaCl, sugar solution, lemon juice, soap

2. Acids vs Bases - Reaction with metals, carbonates

3. Reactivity Series of Metals

4. Exothermic and Endothermic Reactions

5. Double Displacement Reaction - BaCl₂ + Na₂SO₄

6. Preparation of Samples:

- Washing soda (Na₂CO₃.10H₂O)

- Plaster of Paris (CaSO₄.½H₂O)

Biology Experiments (Practice All)

1. Starch Test in Leaves - Using iodine solution

2. CO₂ Production in Respiration - Lime water test

3. Binary Fission in Amoeba - Microscope observation

4. Budding in Yeast - Microscope observation

5. Germination of Seeds - Monocot vs Dicot

6. Homologous and Analogous Organs - Identification

How Practical Exams Are Conducted

Step 1: Roll Number Selection

• Random roll numbers called
• 2-3 students per batch

Step 2: Experiment Allotment

• You'll be given one Physics/Chemistry/Biology experiment
• Apparatus and materials provided

Step 3: Performance (30-40 minutes)

• Set up apparatus
• Perform experiment
• Record observations
• Calculate results

Step 4: Viva Voce (5-10 minutes)

• External examiner asks questions
• Based on your experiment and related theory

Scoring Full Marks in Practicals

Before the Exam

1. Practice All Experiments Multiple Times

• Don't just watch - actually perform experiments
• Understand the principle, not just steps
• Practice calculating results

2. Prepare a Neat Practical File

• Write all experiments in sequence
• Include: Aim, Apparatus, Procedure, Observations, Calculations, Result, Precautions
• Diagrams must be neat and labeled
• Use ruler for underlines and tables

3. Revise Theory Related to Each Experiment

• Know the principle behind each experiment
• Understand formulas used
• Prepare for "why" questions

During the Exam

1. Listen to Instructions Carefully

• Note which experiment you're assigned
• Clarify if unsure about anything

2. Handle Apparatus Confidently

• Don't panic if something breaks (happens!)
• Ask for replacement politely
• Work carefully but not nervously

3. Record Observations Accurately

• Write readings on paper immediately
• Don't try to memorize
• Use proper units

4. Calculate Results Neatly

• Show step-by-step calculation
• Write formulas first
• Include units in final answer

5. Present Well

• Stand confidently
• Explain what you did
• Maintain eye contact with examiner

During Viva Voce

Common Questions Asked:

Physics (Electricity):

• Q: What is Ohm's Law?
• A: At constant temperature, current through a conductor is directly proportional to potential difference (V = IR)

• Q: Why do we use a rheostat in the circuit?
• A: To vary the current flowing through the circuit

Chemistry (Acids-Bases):

• Q: What is the pH range of acids?
• A: Less than 7 (0-6)

• Q: Why does blue litmus turn red in acid?
• A: Because acids donate H⁺ ions which change the color of litmus

Biology (Photosynthesis):

• Q: Why do we use iodine solution in starch test?
• A: Iodine reacts with starch to give blue-black color, confirming presence of starch

• Q: Why do we destarch the leaf before experiment?
• A: To remove any previously stored starch and ensure the starch detected is only from the current experiment

Pro Tip: Even if you don't know the answer, never say "I don't know." Try to relate to what you've studied.

Mathematics Practical/Internal Assessment - 20 Marks

Marks Distribution

Total: 20 marks

1. Periodic Tests: 10 marks (3 tests throughout the year)

2. Mathematics Activities/Projects: 5 marks

3. Portfolio: 5 marks

Mathematics Activities (CBSE Prescribed)

Examples of Activities:

1. Verifying Pythagoras theorem using cutouts

2. Verifying Basic Proportionality Theorem

3. Verifying algebraic identities using graph paper

4. Verifying angle sum property of triangles

5. Finding π using circular objects

6. Probability experiments (dice, coins, cards)

How to Score Full Marks:

• Complete all prescribed activities in practical file
• Use colored paper, graph paper for visual appeal
• Write step-by-step procedure clearly
• Include photographs if doing physical models
• Keep file neat and well-organized

Computer Science/IT Practicals

Practical Exam Format

Total: 30 marks (Class 12) or 50 marks (Class 10 IT)

Components:

1. Programming/Practical Skills: 60-70%

2. Viva Voce: 20-30%

3. Practical File: 10-20%

Common Tasks

Class 10 (Foundation of IT):

• Creating HTML web pages
• Formatting documents in MS Word
• Creating spreadsheets in MS Excel
• Creating presentations in MS PowerPoint
• Basic database operations in MS Access

Class 12 (Computer Science):

• Writing Python programs (File handling, classes, MySQL connectivity)
• SQL queries (DDL, DML, joins, nested queries)
• Creating databases and tables

Scoring Tips

1. Practice Typing Speed

• Practicals are timed
• Faster typing = more time for checking

2. Remember Syntax

• Python syntax (indentation, colons)
• SQL keywords (SELECT, FROM, WHERE, ORDER BY)

3. Comment Your Code

• Shows understanding
• Helps examiner follow your logic

4. Test Before Submitting

• Run your program
• Check for errors
• Verify output

General Tips for All Practical Exams

1. Dress Appropriately

Do's:

• Wear school uniform
• Keep hair tied (for safety in lab)
• Wear closed shoes (not sandals)

Don'ts:

• Loose clothing (can catch fire in chemistry lab)
• Excessive jewelry
• Strong perfumes (can interfere with some experiments)

2. Safety in Laboratory

Physics Lab:

• Handle electrical equipment carefully
• Report any shock or spark immediately
• Don't touch wires with wet hands

Chemistry Lab:

• Never smell chemicals directly
• Use test tube holder for heating
• Report any spillage immediately
• Wash hands after experiment

Biology Lab:

• Handle microscope carefully
• Don't touch slides with bare hands
• Clean slides after use
• Report any broken glass

3. Communication with Examiner

Do's:

• Address examiner respectfully ("Sir"/"Ma'am")
• Speak clearly and confidently
• Admit if you don't know something
• Ask for clarification if needed

Don'ts:

• Argue with examiner
• Blame apparatus if experiment fails
• Copy from others
• Panic if something goes wrong

4. What to Carry

Essential Items:

• School ID card
• Practical file/record
• Blue/black pen
• Pencil, eraser, ruler
• Calculator (if allowed)
• Lab coat (if required)

For Science Practicals:

• Graph paper (for plotting graphs)
• Practical observation notebook

Common Mistakes to Avoid

Mistake 1: Not Practicing Beforehand

Impact: Nervous during actual exam, can't perform smoothly

Solution: Practice each experiment at least 3-4 times before exam

Mistake 2: Incomplete Practical File

Impact: Lose 5 marks directly

Solution: Maintain file throughout the year, don't rush at the end

Mistake 3: Not Knowing Theory Behind Experiments

Impact: Poor performance in viva voce

Solution: Study theory related to each experiment

Mistake 4: Rushing Through Experiment

Impact: Errors in readings, wrong results

Solution: Work methodically, even if others finish early

Mistake 5: Not Asking for Help

Impact: Wasting time, incomplete experiment

Solution: Politely ask examiner or lab assistant if stuck

Practical Exam Day Checklist

Night Before:

• ✅ Revise all experiment procedures
• ✅ Prepare practical file
• ✅ Get good sleep (7-8 hours)
• ✅ Pack all required items

Morning of Exam:

• ✅ Eat light breakfast
• ✅ Reach school 15 minutes early
• ✅ Quick revision of formulas and principles
• ✅ Stay calm and confident

During Exam:

• ✅ Listen to instructions carefully
• ✅ Handle apparatus confidently
• ✅ Record observations accurately
• ✅ Answer viva questions clearly
• ✅ Thank the examiner before leaving

How Practicals Impact Overall Percentage

Example:

Without Practicals (Only Theory):

• Science Theory: 72/80
• Overall: 72/100 = 72%

With Good Practicals:

• Science Theory: 72/80
• Science Practical: 18/20
• Overall: 90/100 = 90%

Difference: 18% improvement just from practicals!

Key Takeaway: Never neglect practicals. They can significantly boost your overall percentage.

Final Advice

Practical exams test not just knowledge, but also skills, confidence, and presence of mind. Approach them with:

• Preparation: Practice all experiments multiple times
• Confidence: Believe in your abilities
• Calmness: Don't panic if something goes wrong
• Respect: Be polite and attentive to examiners

Remember: Practical exams are often easier to score in than theory exams because you have hands-on control. Use them to your advantage!

Good luck with your CBSE practical exams 2026!

Sources:

• CBSE Practical Exam Guidelines
• Class 10 Science Practical Manual - NCERT
• CBSE Practical Marking Scheme 2026