AP FA2 Science Answer Key for 6th, 7th, 8th and 9th classes. Welcome to the complete Science Answer Key 2025 for Grades 6, 7, 8, and 9 based on the latest AP SCERT syllabus (2025–26). This comprehensive guide includes multiple-choice question answers, short and long-answer solutions, and detailed marking rubrics for teachers, students, and parents.
📘 Science – Grade 6 -6th class Answer Key (2025)
🧠Multiple Choice Questions (Q. No. 1–15)
| Q. No. | Answer | Q. No. | Answer | Q. No. | Answer |
|---|---|---|---|---|---|
| 1 | D | 6 | C | 11 | B |
| 2 | A | 7 | D | 12 | D |
| 3 | B | 8 | B | 13 | B |
| 4 | B | 9 | A | 14 | C |
| 5 | D | 10 | B | 15 | A |
✏️ Short and Long Answer Questions (Rubrics)
Q.16 – Sieving (Separation Method):
Sieving separates particles of different sizes using a sieve. Smaller particles pass through holes, larger ones remain.
✅ Example: Separating flour from stones.
Q.17 – Saturated Solution:
Add salt to water until it stops dissolving and settles at the bottom — this is a saturated solution.
Q.18 – Filtration vs. Decantation:
- Filtration is best for separating tea leaves.
- Decantation is slow and less efficient.
Q.19 – Energy-Giving & Body-Building Foods:
- Energy foods: Carbohydrates (rice, sugar), fats (ghee, oil)
- Body-building foods: Proteins (soya beans, fish, meat)
Q.20A – Types of Objects:
- Transparent: See clearly – glass
- Translucent: See partially – butter paper
- Opaque: Cannot see – wood
Q.20B – Protein Test Experiment:
- Add NaOH and CuSO₄ to food sample.
- Observation: Violet = Proteins present.
📗 Science – Grade 7 -7th classAnswer Key (2025)
🧠Multiple Choice Questions (Q. No. 1–15)
| Q. No. | Answer | Q. No. | Answer | Q. No. | Answer |
|---|---|---|---|---|---|
| 1 | D | 6 | C | 11 | A |
| 2 | A | 7 | A | 12 | D |
| 3 | C | 8 | B | 13 | A |
| 4 | B | 9 | C | 14 | A |
| 5 | A | 10 | A | 15 | B |
✏️ Short and Long Answer Questions (Rubrics)
Q.16 – Ozone Layer:
Protects life by absorbing harmful UV rays.
Q.17 – Neutralisation:
Reaction between acid and base is called neutralisation.
Q.18 – Reaction of Iron Sulphate:
- a) Ferrous sulphate
- b) Copper
- c) Chemical change
- d) No, blue colour won’t return.
Q.19 – Respiration in Cockroaches:
Air enters through spiracles → tracheae → oxygen diffuses to cells → CO₂ exits via spiracles.
Q.20A – Galvanisation & Chemical Change:
- Galvanisation prevents rusting.
- Chemical changes form new substances and are irreversible.
Q.20B – Lung Model Experiment:
- Pull rubber sheet → balloons inflate (inhalation)
- Push rubber sheet → balloons deflate (exhalation)
📙 Science – Grade 8 (Physical Science) Answer Key (2025)
🧠Multiple Choice Questions (Q. No. 1–15)
| Q. No. | Answer | Q. No. | Answer | Q. No. | Answer |
|---|---|---|---|---|---|
| 1 | B | 6 | D | 11 | B |
| 2 | C | 7 | A | 12 | B |
| 3 | D | 8 | D | 13 | C |
| 4 | B | 9 | A | 14 | D |
| 5 | C | 10 | A | 15 | C |
✏️ Short and Long Answer Questions (Rubrics)
Q.16 – Conductivity of Water:
- Pure water does not conduct electricity.
- Adding salt makes it conductive.
Q.17 – Role of Lubricants:
Reduces friction by forming a layer between surfaces.
Q.18 – Electroplating & Insulators:
- Electroplating: depositing metal via electricity.
- Insulators: do not allow current to pass.
Q.19 – Friction (Kumar’s Box):
Heavier box → more friction → more force needed.
Q.20A – Increasing & Reducing Friction:
- Increase: Tyre grooves, sand on hands.
- Reduce: Oil on bicycle chains, ball bearings.
Q.20B – Conductors, Insulators & Rusting:
- Metals: conductors
- Rubber/plastic: insulators
- Zinc: prevents rust
- Rainwater: conducts electricity due to dissolved salts.
📘 Science – Grade 9 (Physical Science) Answer Key (2025)
🧠Multiple Choice Questions (Q. No. 1–15)
| Q. No. | Answer | Q. No. | Answer | Q. No. | Answer |
|---|---|---|---|---|---|
| 1 | D | 6 | A | 11 | D |
| 2 | A | 7 | D | 12 | A |
| 3 | D | 8 | B | 13 | C |
| 4 | D | 9 | C | 14 | B |
| 5 | B | 10 | B | 15 | C |
✏️ Short and Long Answer Questions (Rubrics)
Q.16 – Constant Velocity:
If velocity is constant, net force = 0.
Friction = –Applied Force = –100 N.
Q.17 – Brass:
Alloy of copper (80%) and zinc (20%). Used in utensils and switches.
Q.18 – Newton’s Third Law:
Every action has an equal and opposite reaction.
- Rocket propulsion
- Wall reaction force
Q.19 – Types of Colloids:
- Milk: Liquid in liquid
- Fog: Liquid in gas
- Coloured Gem: Solid in solid
- Milk of Magnesia: Solid in liquid
Q.20A – Derivation of F = ma:
- Force ∝ acceleration
- Calculation:
Q.20B – Concentration of Solution:
- Formula:
- Calculation:
