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100+ Free Odisha BSE HSC General Science Practice Questions

Odisha BSE HSC Class X General Science (GSC) — Physical Science & Life Science practice questions are available now; exam metadata is being verified.

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2026 Statistics

Key Facts: Odisha BSE HSC General Science Exam

~100

Typical paper marks

BSE Odisha HSC Pattern of Question summaries

~2.5 h

Typical paper duration

HSC exam pattern summaries (confirm circular)

50+50

Objective + subjective marks (typical)

Pattern of Question 2026 summaries

~30/100

Typical subject pass threshold

Common BSE Odisha HSC norms

EN / OR

Common exam media

BSE Odisha HSC practice

Odisha BSE HSC General Science (GSC) is a Class 10 board subject under BSE Odisha, typically 100 marks with mixed objective and subjective sections (about 2 h 30 m). This bank provides a free English MCQ study adaptation for 2026 Physical and Life Science revision—not a full official paper simulation.

Sample Odisha BSE HSC General Science Practice Questions

Try these sample questions to test your Odisha BSE HSC General Science exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which of the following is an example of a combination reaction?
A.CaCO3 → CaO + CO2
B.2H2 + O2 → 2H2O
C.Zn + CuSO4 → ZnSO4 + Cu
D.2AgCl → 2Ag + Cl2
Explanation: In a combination reaction, two or more reactants form a single product. Hydrogen and oxygen combine to form water.
2A chemical equation is balanced primarily to obey which law?
A.Law of constant proportions only
B.Law of conservation of mass
C.Charles's law
D.Boyle's law
Explanation: Balancing ensures the same number of each type of atom on both sides, reflecting conservation of mass.
3Which reaction is a double displacement (precipitation) reaction?
A.2Mg + O2 → 2MgO
B.2H2O → 2H2 + O2
C.CuO + H2 → Cu + H2O
D.Na2SO4 + BaCl2 → BaSO4 + 2NaCl
Explanation: Sodium sulfate and barium chloride exchange ions; insoluble BaSO4 precipitates—a classic double displacement.
4Rusting of iron is best classified as:
A.Oxidation (corrosion with oxygen and moisture)
B.Neutralization
C.Displacement only
D.Thermal decomposition only
Explanation: Rusting is corrosion of iron in oxygen and moisture; iron is oxidized to hydrated iron(III) oxide.
5In the reaction Zn + CuSO4 → ZnSO4 + Cu, zinc acts as a:
A.Spectator only with no electron change
B.Oxidizing agent
C.Reducing agent
D.Catalyst
Explanation: Zinc loses electrons (is oxidized) and reduces Cu2+ to Cu, so zinc is the reducing agent.
6When silver chloride is exposed to sunlight, it turns grey due to:
A.Combination with oxygen only
B.Neutralization
C.Photochemical decomposition to silver and chlorine
D.Physical melting only
Explanation: 2AgCl → 2Ag + Cl2 in light; free silver makes the residue grey—a photochemical decomposition used in photography concepts.
7The brown fumes formed when lead nitrate is heated strongly are mainly:
A.NO2 (nitrogen dioxide)
B.O2 only
C.NH3
D.CO2
Explanation: 2Pb(NO3)2 → 2PbO + 4NO2 + O2; brown NO2 gas is characteristic of thermal decomposition of lead nitrate.
8Which indicator turns red in acidic solution and blue in basic solution?
A.Phenolphthalein
B.Methyl orange only (always yellow)
C.Litmus
D.Universal indicator is always green
Explanation: Blue litmus turns red in acid; red litmus turns blue in base—the classic litmus behaviour.
9The pH of a neutral aqueous solution at 25 °C is:
A.7
B.0
C.14
D.1
Explanation: Neutral water has [H+] = [OH−] and pH 7 at 25 °C under standard Class 10 treatment.
10Which of the following is a strong acid among common Class 10 examples?
A.CH3COOH (acetic acid)
B.H2CO3 (carbonic acid)
C.H2S (hydrogen sulphide)
D.HCl (hydrochloric acid)
Explanation: HCl is a strong mineral acid that ionizes almost completely in water; the others are weak acids.

About the Odisha BSE HSC General Science Practice Questions

Verified exam format metadata for Odisha BSE HSC Class X General Science (GSC) — Physical Science & Life Science is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.