TS Class 10 Physical Science Solved Public Exam Paper 2023 - Physics & Chemistry Solutions, & Part-B

📄 Official Board Exam Solution — 2023

TS SSC Physical Science 2023 Public Exam Solved Paper

Complete Step-by-Step Official Solutions: Physics & Chemistry Sections, Total Internal Reflection, Solved Circuit Power Numericals & Part-B Objective MCQs

📌 2023 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

Total Internal Reflection, Convex Lens Magnification, Electric Power, and Electromagnetism:

Physics Section = 20 Marks

3. Chemistry Section Focus

Quantum Numbers, Periodic Trends, Ore Concentration, and IUPAC Nomenclature:

Chemistry Section = 20 Marks

📊 TS SSC 2023 Question Paper Key Topics Analysis

High-priority topics that appeared in the official 2023 Telangana Class 10 Public Examination:

Key Core Topics in 2023 Paper

1. Critical Angle & Total Internal Reflection

Featured Question: Definition of critical angle and relation to refractive index n = 1 / sin(C) with application to optical fibers.

2. Electric Current & Power Numericals

Featured Question: Circuit calculation for resistors in series vs parallel and electrical energy power bill calculation.

3. Structure of Atom & Quantum Numbers

Featured Question: Write the 4 quantum numbers for the outer electron of Chlorine (Cl, Z = 17).

4. Carbon Compounds & IUPAC Rules

Featured Question: Homologous series rules and structural formulas of ethanol, ethanoic acid, and propanone.

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. What is Critical Angle? Write the formula connecting Critical Angle (C) and Refractive Index (n).

Answer:

• Critical Angle (C): The angle of incidence in a denser medium for which the angle of refraction in the rarer medium becomes exactly 90°.
• When the angle of incidence exceeds the critical angle, Total Internal Reflection occurs.
• Mathematical Formula:
  n = 1 / sin(C)   or   sin(C) = 1 / n
• Where: n = Refractive index of denser medium relative to rarer medium, and C = Critical angle.

PHYSICS - 4 MARKS SOLVED NUMERICAL

Q2. An electric heater rated 1000 W (1 kW) operates 5 hours daily for 30 days. Calculate:
(a) Total electrical energy consumed in units (kWh).
(b) Cost of electricity consumed at &rupee; 5.00 per unit.

Given Data: Power P = 1000 W = 1 kW | Daily Usage = 5 hours | Days = 30 days

Total Operating Time t = 5 hours/day × 30 days = 150 hours

(a) Calculating Electrical Energy (E) in kWh (Units):

Energy Formula: E = Power (kW) × Time (hours)

E = 1 kW × 150 h = 150 kWh (150 Units)

(b) Calculating Total Electricity Bill Cost:

Cost = Total Units × Rate per unit

Cost = 150 × &rupee; 5.00 = &rupee; 750.00

✓ Final Answer:
1. Electrical Energy Consumed = 150 kWh (150 Units).
2. Total Electricity Cost = &rupee; 750.00.

PHYSICS - 6 MARKS ESSAY & RAY DIAGRAM

Q3. An object is placed between the Optic Center (O) and Focus (F₁) of a Convex Lens. Describe the position, nature, and characteristics of the image formed. Draw a schematic ray diagram and state one practical application.

Answer:

• Position of Object: Between Optic Center (O) and Focus (F₁).
• Position of Image: Formed on the same side of the lens as the object.
• Nature and Characteristics of Image:
  1. Nature: Virtual and Erect.
  2. Size: Magnified (Larger than the object).
  3. Magnification (m): Positive and greater than 1 (m > +1).
• Practical Application: Used in a Simple Microscope / Magnifying Glass and by watchmakers to inspect micro-components.

Ray Tracing Rules Used:

1. Ray parallel to principal axis refracts through Focus F₂.

2. Ray passing through Optic Center O passes straight undeviated.

3. Both refracted rays diverge; extending them backward forms a virtual magnified erect image.

🧪 Chemistry Section Solved Questions (Part-A)

CHEMISTRY - 2 MARKS

Q4. Write the set of four Quantum Numbers for the outer electron of a Chlorine atom (Cl, Z = 17).

Answer:

• Chlorine (Cl, Z = 17): Ground state electronic configuration = 1s² 2s² 2p⁶ 3s² 3p⁵.
• The outer electron enters the 3p subshell (3p⁵).
• 4 Quantum Numbers for the 17th electron:
  • Principal Quantum Number (n) = 3
  • Angular Momentum Quantum Number (l) = 1 (for p-subshell)
  • Magnetic Quantum Number (m_l) = 0 (or +1 / -1)
  • Spin Quantum Number (m_s) = -½ (paired electron spin)

CHEMISTRY - 4 MARKS

Q5. Describe the Froth Floatation process for concentrating Sulphide Ores with a neat operational principle.

Answer:

• Principle: Based on the differential wetting properties of ore particles and gangue impurities. Ore particles are preferentially wetted by oil, while gangue particles are wetted by water.
• Process:
  1. Finely powdered sulphide ore (e.g., Galena PbS or Zinc Blende ZnS) is placed in a large tank containing water and pine oil.
  2. Compressed air is blown through the mixture to produce rich froth.
  3. The light sulphide ore particles stick to pine oil bubbles and rise to the surface as froth.
  4. The froth is skimmed off, collected, and dried to obtain concentrated ore. Heavy gangue settles at the bottom.

CHEMISTRY - 6 MARKS ESSAY

Q6. Write the IUPAC names, structural formulas, and functional group definitions for:
(a) Ethanol
(b) Ethanoic Acid
(c) Propanone

Compound Name	Functional Group	Molecular Formula	Structural Formula Representation
Ethanol	Alcohol (−OH)	C2H5OH	CH3−CH2−OH
Ethanoic Acid	Carboxylic Acid (−COOH)	CH3COOH	CH3−C(=O)−OH
Propanone (Acetone)	Ketone (>C=O)	CH3COCH3	CH3−C(=O)−CH3

🎯 PART-B Objective Bits Bank (10 MCQs - Official 2023 Paper)

BIT 1

1. Total Internal Reflection occurs when a light ray travels from a:

• Rarer medium to a Denser medium
• Denser medium to a Rarer medium
• Vacuum to air
• Water to glass

✓ Correct Option: B (Denser medium to a Rarer medium)

BIT 2

2. What focal length lens is required to achieve a power of +2.0 D?

• +50 cm
• +20 cm
• +100 cm
• -50 cm

✓ Correct Option: A (f = 100 / P = 100 / 2 = +50 cm)

BIT 3

3. Commercial unit of electrical energy 1 kilowatt-hour (1 kWh) is equal to:

• 3.6 × 10⁵ J
• 3.6 × 10⁶ J
• 1000 J
• 3600 J

✓ Correct Option: B (3.6 × 10⁶ Joules)

BIT 4

4. The direction of magnetic field lines around a straight current conductor is determined using:

• Fleming's Left Hand Rule
• Right Hand Thumb Rule
• Fleming's Right Hand Rule
• Snell's Law

✓ Correct Option: B (Right Hand Thumb Rule)

BIT 5

5. Which subshell orbital has a spherical shape?

• s-orbital
• p-orbital
• d-orbital
• f-orbital

✓ Correct Option: A (s-orbital)

BIT 6

6. What is the value of Angular Momentum Quantum Number (l) for a p-subshell?

• 0
• 1
• 2
• 3

✓ Correct Option: B (l = 1 for p-subshell)

BIT 7

7. What is the chemical formula of Hematite (ore of Iron)?

• Fe₂O₃
• Fe₃O₄
• FeS₂
• FeCO₃

✓ Correct Option: A (Fe₂O₃)

BIT 8

8. Thermite reaction involves the reduction of Iron oxide using which metal powder?

• Copper
• Aluminium
• Zinc
• Magnesium

✓ Correct Option: B (Aluminium powder)

BIT 9

9. General formula of Alkyne hydrocarbons with a triple bond is:

• C_nH_2n+2
• C_nH_2n
• C_nH_2n-2
• C_nH_2n+1

✓ Correct Option: C (C_nH_2n-2)

BIT 10

10. What is the functional group present in Propanone (Acetone)?

• Alcohol (−OH)
• Aldehyde (−CHO)
• Ketone (>C=O)
• Carboxylic Acid (−COOH)

✓ Correct Option: C (Ketone >C=O)