DSSSB TGT & PGT Computer Science General Science PYQ (Part 2): 150 Questions with Revision Notes (2014–2025)

Curated specifically for DSSSB TGT Computer Science (DOE / NDMC), PGT Computer Science, and General Paper 1 (Section A: General Awareness).

📌 DSSSB General Science Master Series:

Part 1 Practice Questions 1–150 (Physics, Everyday Chemistry, Biology Basics) → Current Part 2: Questions 151–300 (Electronics, Organic Chemistry, Genetics, Space)

💡 Pro Tip: Before starting the 20-minute CBT Mock Test below, review the Quick Revision Notes & Key Terms for all 5 domains. This will help you answer factual questions in under 10 seconds each!

📖 Topic-Wise Revision Notes & Essential Terms

Click any topic tab below to review the high-yield summary before taking the test:

⚡ Electricity, Magnetism & Electronics Revision

Core Concepts:

Semiconductors: Silicon ($Si$) and Germanium ($Ge$) are tetravalent. Doping with pentavalent atoms (P, As) creates N-type (free electrons). Doping with trivalent atoms (B, Al, In) creates P-type (holes).
Ohm's Law: $V = I \cdot R$. Resistance increases with conductor length ($L$) and decreases with cross-sectional area ($A$): $R = \rho \frac{L}{A}$.
Domestic Wiring Color Codes: Live = Brown / Red; Neutral = Blue / Black; Earth = Green / Yellow stripe.
Transformer: Operates strictly on AC via mutual induction. Step-up increases voltage ($V_s > V_p$), Step-down reduces voltage.

Rectifier: Converts Alternating Current (AC) into Direct Current (DC) using diodes.

Inverter: Converts DC to AC.

Farad (F): SI unit of electrical capacitance ($C = Q/V$).

Meissner Effect: Complete expulsion of magnetic fields by superconductors at critical temperatures.

🧪 Metals, Non-Metals & Organic Chemistry Revision

Core Concepts:

Natural Gas & Biogas: Consists mostly of Methane ($CH_4$) (over 75–90%). Methane is also termed 'Marsh Gas'.
Vulcanization: Heating crude rubber with 3–5% sulfur to create disulfide cross-links, preventing melting in heat and brittleness in cold.
Non-Stick Cookware: Coated with Teflon (Polytetrafluoroethylene - PTFE).
Liquid Elements at Room Temp: Only two elements are liquid at standard conditions: Bromine ($Br$) (non-metal) and Mercury ($Hg$) (metal).

Bauxite: Foremost commercial hydrated oxide ore of Aluminium ($Al_2O_3 \cdot 2H_2O$).

Cinnabar: Natural red sulfide ore of Mercury ($HgS$).

Saponification: Hydrolysis of fats/oils using alkaline base yielding Soap + Glycerol.

Ethylene: Phytohormone gas that induces natural and artificial fruit ripening.

🌱 Genetics, Evolution & Plant Physiology Revision

Core Concepts:

Mendelian Inheritance: Gregor Mendel established the Laws of Segregation and Independent Assortment using garden peas (Pisum sativum).
Human Chromosomes: 23 pairs (46 total). 22 pairs of autosomes and 1 pair of allosomes/sex chromosomes (XX in females, XY in males).
DNA Structure: Double helix model proposed by Watson & Crick (1953) with nitrogenous base pairs: Adenine-Thymine ($A=T$) and Guanine-Cytosine ($G\equiv C$).
Xylem vs Phloem: Xylem transports water/minerals unidirectionally; Phloem translocates synthesized sugars bidirectionally.

Auxin: Phytohormone responsible for phototropism and apical bud dominance.

Abscisic Acid (ABA): 'Stress hormone' in plants triggering stomatal closure during drought.

Transpiration: Evaporative loss of water through stomata, generating root suction pull.

Trisomy 21: Genetic nondisjunction causing an extra 21st chromosome (Down Syndrome).

🫀 Human Physiology, Enzymes & Endocrine Glands Revision

Core Concepts:

Pituitary Gland: Located at the base of the brain (hypophysis); known as the 'Master Gland' because it controls thyroid, adrenals, and gonads.
Adrenaline (Epinephrine): Secreted by adrenal medulla during acute fight-or-flight emergencies.
Blood Pressure: Measured by sphygmomanometer. Ideal reading is $120/80\text{ mm Hg}$ ($120$ Systolic, $80$ Diastolic).
Erythropoiesis: Red blood cells (RBCs) with 120-day lifespans are manufactured in adult Red Bone Marrow.

Ptyalin (Salivary Amylase): Enzyme in saliva breaking down starch into maltose.

Cerebellum: Subregion of brain responsible for balance, posture, and motor coordination.

Medulla Oblongata: Regulates involuntary autonomic functions (heart rate, breathing, vomiting).

Bile: Secreted by liver, stored in gallbladder; emulsifies dietary fats.

🚀 Space Science, Nuclear Physics & Energy Revision

Core Concepts:

Solar Energy: Sustained continuously by Nuclear Fusion (4 Hydrogen nuclei fusing into 1 Helium nucleus under extreme pressure).
Nuclear Fission: Splitting of fissile heavy atoms like Uranium-235 ($U^{235}$) or Plutonium-239 ($Pu^{239}$) by slow thermal neutrons.
Moderator: Slows down fast neutrons to maintain steady thermal chain reactions (Heavy Water $D_2O$ or Graphite).
Geostationary Orbit: Orbit height $\approx 35,786\text{ km}$, orbital period $= 24\text{ hours}$ (synchronized with Earth's rotation).

Becquerel (Bq): SI unit of radioactivity ($1\text{ decay/sec}$). Historical unit: Curie ($Ci$).

Cobalt-60: Emits gamma rays; used in cancer radiotherapy.

Carbon-14: Radioactive isotope (half-life $\approx 5730\text{ years}$) used to date ancient organic artifacts.

Aryabhata: India's first satellite, launched by ISRO in April 1975.

DSSSB CBT PART 2 General Science PYQs (Q151 to Q300)

Time Remaining: 20:00

Electricity & Electronics Question 151 of 300

DSSSB TGT CS 2021 Repeated 4 Times

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Answered: 0

Unanswered: 150

Marked: 0

Crucial Concepts Tested in DSSSB TGT Computer Science Part 2

Part 2 bridges general science with electronic principles and biological systems. Focus on these recurrent patterns:

Sub-discipline	High-Frequency DSSSB Topics	Exam Relevance
Electronics & Electricity	Doping in semiconductors (P-type vs N-type), Silicon/Germanium, step-up/down transformers, domestic wire color codes (Live: Brown/Red, Neutral: Blue/Black, Earth: Green).	Essential for CS & General Paper
Organic Chemistry	Methane as Marsh Gas, Teflon (PTFE) in non-stick cookware, vulcanization of rubber using Sulfur, Saponification process.	Repeated across 2017–2024 shifts
Genetics & Hormones	Gregor Mendel's pea experiments, DNA double helix (Watson & Crick), Master gland (Pituitary), Fight-or-flight hormone (Adrenaline).	Direct scoring questions
Nuclear & Space	Nuclear fission in reactors (U-235), nuclear fusion in the Sun (Hydrogen to Helium), moderator rods (Heavy water/Graphite).	Direct Section A items

Frequently Asked Questions (DSSSB General Science Part 2)

1. Where can I solve the first 150 questions of this series?

You can access Part 1 directly through this link: DSSSB General Science Mock Test Part 1 (Questions 1 to 150).

2. Why are semiconductor and logic questions asked in Section A for TGT CS candidates?

Semiconductor physics sits at the intersection of Class 10/12 NCERT Physics and basic computer hardware engineering. Questions about silicon doping, diodes, and rectifiers frequently appear in both Section A (General Science) and introductory Section B (Computer Science).

3. What is the moderator used in nuclear power reactors in India?

Heavy water ($D_2O$) and high-purity Graphite are commonly utilized as moderators to slow down fast neutrons to sustain controlled nuclear fission reactions.

4. How should I allocate my 20-minute time limit for 150 questions?

General Science questions are purely factual. If you know the concept, it takes under 6 to 8 seconds to mark an answer. This speed-drill format trains your recall so you can save maximum time for mathematical reasoning and computer science coding sections.