BPSC CCE Prelims
Science and Technology Developments Previous Year Questions (PYQs)
Showing solved Previous Year Questions for Chapter: Science and Technology Developments
Topic Breakdown: Scroll →
Steam methane reforming technique is used to obtain
Detailed Explanation:
Steam Methane Reforming (SMR) reacts natural gas (methane) with high-temperature steam to produce hydrogen and carbon dioxide (CO₂) as a by-product.
Since the process emits CO₂ without carbon capture, the hydrogen produced is classified as Grey Hydrogen. Brown Hydrogen comes from coal gasification, while Green Hydrogen is produced via water electrolysis using renewable energy with zero emissions.
Which Material is used for smart film?
Detailed Explanation:
Smart films switch transparency when voltage is applied, requiring a material that is both electrically conductive and optically transparent.
Indium tin oxide (ITO) is a transparent conducting oxide used in smart films, touchscreens, and LCDs. Calcium carbonate is a non-conductive filler in plastics. Zinc chloride is used in batteries, not films. Silica is an insulator used in glass.
How is Hydrogen stored physically?
Detailed Explanation:
Physical storage of hydrogen means storing H₂ gas without any chemical transformation.
Compressing hydrogen gas into high-pressure tanks (350–700 bar) is the most common physical storage method – no chemical bonds are formed or broken.
Hydrides involve chemical bonding with metals/alloys (chemical storage), and water (H₂O) is a compound, not free hydrogen gas.
🧐 Not Sure What to Study Next?
Get a personalised study plan based on your goals, time and revision needs.
Light weight bullet proof helmets and jackets use which of the following fibres for their production?
Detailed Explanation:
Kevlar is a synthetic aramid fibre developed by DuPont in 1965, known for its extremely high tensile strength (5 times stronger than steel by weight) and low weight.
Its unique properties include bullet energy absorption and dispersion, flexibility, heat resistance, and fire resistance, making it the preferred material for lightweight bulletproof helmets and jackets. Terylene and Nylon lack the necessary impact resistance for ballistic protection.
Which among the following is the main constituent of biogas?
Detailed Explanation:
Biogas is produced by anaerobic digestion of organic matter and contains 50–70% methane (CH₄), which is its primary combustible component.
Propane, butane, and ethane are constituents of petroleum gas and natural gas, not biogas.
Therefore, methane is the main constituent of biogas, making Option 4 the correct answer.
Hydrogen bomb is based on the principle of
Detailed Explanation:
A hydrogen bomb (thermonuclear weapon) derives its massive explosive energy from nuclear fusion, where light atomic nuclei (deuterium and tritium) combine at extremely high temperatures to form heavier nuclei, releasing enormous energy.
This fusion process is uncontrolled and instantaneous, creating a runaway chain reaction that produces the bomb's devastating yield. A fission bomb (atomic bomb) is used as a trigger to generate the extreme heat and pressure required to initiate the fusion reaction.
Therefore, hydrogen bombs operate on uncontrolled fusion reactions, making Option 2 the correct answer.