TS Class 10 Physical Science Solved Public Exam Paper 2025 - Physics & Chemistry Solutions, & Part-B

📄 Official Board Exam Solution — 2025

TS SSC Physical Science 2025 Public Exam Solved Paper

Complete Step-by-Step Official Solutions: Physics & Chemistry Sections, Refraction at Curved Surfaces, Circuit Power Numericals & Part-B Objective MCQs

📌 2025 Board Examination Pattern & Weightage Summary

1. Total Weightage & Time

Total Marks: 40 Marks (Part-A: 35 Marks + Part-B: 5 Marks) | Duration: 1 Hour 30 Minutes

Part-A = 35 Marks  |  Part-B = 5 Marks (10 MCQs)

2. Physics Section Focus

Vision Defects (Myopia/Hypermetropia), Convex Lens Ray Diagrams, Electric Power & Electromagnetism:

Physics Section = 20 Marks

3. Chemistry Section Focus

Acid-Base Neutralization, Quantum Numbers, Periodic Trends & Organic Reactions (Esterification):

Chemistry Section = 20 Marks

📊 TS SSC 2025 Question Paper Key Topics Analysis

High-priority topics that appeared in the official 2025 Telangana Class 10 Public Examination:

Key Core Topics in 2025 Paper

1. Defects of Vision & Lens Correction

Featured Question: Myopia vs Hypermetropia, focal length calculation, and corrective concave/convex lens power.

2. Resistors in Parallel & Power Bill

Featured Question: Solved 3-resistor parallel circuit numerical and monthly kWh electrical energy cost calculation.

3. Quantum Numbers & Bonding

Featured Question: Complete set of 4 quantum numbers for the 11th electron of Sodium (Na, Z = 11) & Lewis dot structures.

4. Acids, Bases & Carbon Compounds

Featured Question: pH importance in everyday life, Esterification, and Saponification reaction equations.

Official Board Pattern Note: All answers are strictly grounded in TS SCERT Class 10 Physical Science textbook standards and verified according to official board valuation guidelines.

⚡ Physics Section Solved Questions (Part-A)

PHYSICS - 2 MARKS

Q1. Differentiate between Myopia (Nearsightedness) and Hypermetropia (Farsightedness). Name the type of lens used to correct each defect.

Feature	Myopia (Nearsightedness)	Hypermetropia (Farsightedness)
Vision Capability	Can see nearby objects clearly, but cannot see distant objects distinctly.	Can see distant objects clearly, but cannot see nearby objects distinctly.
Image Formation	Image of distant object forms in front of the retina.	Image of nearby object forms behind the retina.
Cause of Defect	Elongation of eyeball or excessive curvature of eye lens.	Shortening of eyeball or focal length of eye lens being too long.
Corrective Lens Required	Concave Lens (Diverging lens of suitable power).	Convex Lens (Converging lens of suitable power).

PHYSICS - 4 MARKS SOLVED NUMERICAL

Q2. Three resistors of 20 Ω, 30 Ω, and 60 Ω are connected in parallel across a 12 V battery. Calculate:
(a) Equivalent resistance of the parallel combination.
(b) Total current drawn from the battery.
(c) Current flowing through the 20 Ω resistor.

Given Data: R₁ = 20 Ω, R₂ = 30 Ω, R₃ = 60 Ω, Battery Voltage V = 12 V

(a) Calculating Equivalent Resistance (R_eq):

1 / R_eq = 1 / R₁ + 1 / R₂ + 1 / R₃

1 / R_eq = 1 / 20 + 1 / 30 + 1 / 60 = (3 + 2 + 1) / 60 = 6 / 60 = 1 / 10

R_eq = 10 Ω

(b) Calculating Total Circuit Current (I):

I = V / R_eq = 12 V / 10 Ω = 1.2 A

(c) Calculating Current through 20 Ω Resistor (I₁):

I₁ = V / R₁ = 12 V / 20 Ω = 0.6 A

✓ Final Answer:
1. Equivalent Resistance R_eq = 10 Ω.
2. Total Circuit Current I = 1.2 A.
3. Branch Current I₁ (20 Ω) = 0.6 A.

PHYSICS - 6 MARKS ESSAY & RAY DIAGRAM

Q3. An object is placed beyond 2F₁ (Center of Curvature) in front of a Convex Lens. Describe the position, nature, size, and magnification of the image formed. Draw a neat schematic ray diagram.

Answer:

• Position of Object: Beyond 2F₁ in front of the convex lens.
• Position of Image: Formed between F₂ and 2F₂ on the opposite side of the lens.
• Nature and Characteristics of Image:
  1. Nature: Real and Inverted.
  2. Size: Diminished (Smaller than the object).
  3. Magnification (m): Negative and less than 1 (|m| < 1).

Ray Tracing Rules Used:

1. Ray 1: Parallel to principal axis passes through focus F₂ after refraction.

2. Ray 2: Passing through Optic Center O continues straight undeviated.

3. Intersection Point: Both refracted rays meet between F₂ and 2F₂ to form a real inverted diminished image.

🧪 Chemistry Section Solved Questions (Part-A)

CHEMISTRY - 2 MARKS

Q4. Explain the importance of pH in everyday life with respect to:
(a) Human digestive system.
(b) Tooth decay prevention.

Answer:

• (a) Human Digestive System: Stomach produces Hydrochloric Acid (HCl, pH ~ 1.5 to 3.5) to digest food without harming stomach walls. Excess acid during indigestion causes pain, which is neutralized by taking Antacids (mild bases like Mg(OH)₂ Milk of Magnesia).
• (b) Tooth Decay Prevention: Tooth decay starts when mouth pH falls below 5.5. Bacteria in the mouth produce acids by degrading sugar particles left in teeth. Using alkaline toothpaste neutralizes the excess acid and prevents enamel decay.

CHEMISTRY - 4 MARKS

Q5. Write the set of four Quantum Numbers for the 11th electron of Sodium (Na, Z = 11) and the 19th electron of Potassium (K, Z = 19).

Element & Atomic No.	Outermost Orbital	n	l	ml	ms
Sodium (Na, Z = 11)	3s1 subshell	3	0 (s)	0	+½
Potassium (K, Z = 19)	4s1 subshell	4	0 (s)	0	+½

CHEMISTRY - 6 MARKS ESSAY

Q6. Explain the following organic reactions with balanced chemical equations:
(a) Esterification Reaction.
(b) Saponification Reaction.
(c) Oxidation of Ethanol using Alkaline KMnO₄.

(a) Esterification Reaction:

Reaction between Ethanoic acid and Ethanol in the presence of conc. H₂SO₄ to form sweet-smelling Ethyl acetate ester:

CH₃COOH + C₂H₅OH →conc. H₂SO₄→ CH₃COOC₂H₅ + H₂O

(b) Saponification Reaction:

Reaction of an ester with aqueous Sodium Hydroxide (NaOH) to prepare Soap:

CH₃COOC₂H₅ + NaOH → CH₃COONa (Soap) + C₂H₅OH

(c) Oxidation of Ethanol:

Ethanol is oxidized to Ethanoic acid on heating with Alkaline Potassium Permanganate (Alk. KMnO₄):

CH₃CH₂OH + 2[O] →Alk. KMnO₄ + Heat→ CH₃COOH + H₂O

✓ These three chemical reactions form the core organic chemistry equations in Class 10 Board Exams.

🎯 PART-B Objective Bits Bank (10 MCQs - Official 2025 Paper)

BIT 1

1. The power of a lens used to correct Myopia is always:

• Positive (+)
• Negative (-)
• Zero
• Infinite

✓ Correct Option: B (Negative - Concave lens)

BIT 2

2. What is the least distance of distinct vision for a normal human adult eye?

• 2.5 cm
• 25 cm
• 2.5 m
• Infinity

✓ Correct Option: B (25 cm)

BIT 3

3. What is the SI unit of Electric Power?

• Joule
• Watt
• Ampere
• Ohm-meter

✓ Correct Option: B (Watt - W)

BIT 4

4. An AC Generator converts mechanical energy into electrical energy using:

• Split rings
• Slip rings
• Commutator
• Carbon brushes only

✓ Correct Option: B (Slip rings)

BIT 5

5. What is the maximum number of electrons that can occupy a d-subshell?

• 2
• 6
• 10
• 14

✓ Correct Option: C (10 electrons)

BIT 6

6. Tooth decay begins when mouth pH drops below:

• 7.0
• 6.5
• 5.5
• 4.0

✓ Correct Option: C (pH below 5.5)

BIT 7

7. Bauxite ore is concentrated using which method?

• Froth Floatation
• Leaching / Chemical Method
• Magnetic Separation
• Roasting

✓ Correct Option: B (Leaching / Chemical Method)

BIT 8

8. Modern Periodic Law states that properties of elements are periodic functions of their:

• Atomic mass
• Atomic number
• Mass number
• Density

✓ Correct Option: B (Atomic number - Henry Moseley)

BIT 9

9. Chemical formula of Ethyl Ethanoate ester is:

• CH₃COOH
• CH₃COOC₂H₅
• C₂H₅OH
• CH₃CHO

✓ Correct Option: B (CH₃COOC₂H₅)

BIT 10

10. The functional group present in Alcohols is:

• -CHO
• -OH
• -COOH
• >C=O

✓ Correct Option: B (-OH)