67th BPSC Prelims 2022
General Science Previous Year Questions (PYQs)
Explore 29 solved 67th BPSC Prelims 2022 General Science questions with detailed step-by-step bilingual solutions, option analysis, and answer keys.
If a feather, a rubber ball and a wooden ball are falling freely simultaneously from the same height in vacuum, then
Detailed Explanation:
In a vacuum, all objects fall with the same acceleration (g = 9.8 m/s²) regardless of mass or composition, as demonstrated by Galileo's principle. Without air resistance, a feather, rubber ball, and wooden ball experience identical downward acceleration.
Air resistance normally causes lighter objects like feathers to fall slower on Earth, but in vacuum conditions this factor is completely eliminated, making mass and material properties irrelevant to fall time.
Therefore, all three objects reach the ground simultaneously, making Option 4 the correct answer.
Which of the following is not correctly matched?
Detailed Explanation:
Galvanometer measures small electric currents and detects current direction using needle deflection; it does not measure electric resistance.
Voltmeter measures potential difference, Ammeter measures electric current, and Potentiometer measures electromotive force—all correctly matched.
Therefore, Galvanometer-Electric resistance is incorrectly matched, making Option 4 the correct answer.
A piece of ice is floating in a beaker containing water up to its brim. When whole of the ice melts
Detailed Explanation:
When ice floats in water, it displaces a volume of water equal to its own weight. By Archimedes' principle, the mass of displaced water equals the mass of the ice.
When the ice melts, it converts into water of exactly the same mass and occupies the same volume as the water it originally displaced. Therefore, the water level remains unchanged.
Therefore, the water level will not change, making Option 4 the correct answer.
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If the doors of a refrigerator are left open for few hours, then the room temperature will
Detailed Explanation:
A refrigerator operates on the Second Law of Thermodynamics: it removes heat from inside and releases it (plus compressor work energy) outside. With doors open, heat expelled into the room exceeds heat absorbed from the room, causing a net temperature increase.
The compressor converts electrical energy into heat, adding extra thermal energy to the room. The cooling effect is localized and temporary, while the heating effect is continuous and distributed.
Therefore, the room temperature will increase, making Option 2 the correct answer.
Food gets cooked faster in a pressure cooker because
Detailed Explanation:
In a pressure cooker, the sealed environment increases internal pressure, which raises the boiling point of water above the normal 100°C (at atmospheric pressure). Water boils at a higher temperature (~120°C), transferring more heat energy to food, cooking it faster.
Options 1 and 3 incorrectly state boiling occurs at low temperature, while option 4 wrongly claims low pressure inside the cooker.
Therefore, water boils at high temperature due to high pressure, making Option 2 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.
Twinkling of stars in clear sky during nighttime can be explained with
Detailed Explanation:
Stellar twinkling (or scintillation) occurs because starlight passes through Earth's atmosphere with continuously varying refractive index due to turbulent air layers of different temperatures and densities. This causes the light path to bend unpredictably, making stars appear to twinkle.
Reflection involves bouncing back of light, polarization relates to light wave orientation, and interference involves superposition of waves—none explain atmospheric twinkling.
Therefore, refraction of light is the correct physical phenomenon, making Option 1 the correct answer.
A fan produces a feeling of comfort during the hot weather because
Detailed Explanation:
A fan creates air movement that accelerates the evaporation of perspiration from our skin. This evaporation is an endothermic process that absorbs heat from the body, producing a cooling sensation.
The fan does not supply cool air (it merely circulates room-temperature air), nor does it significantly alter body heat radiation or air conductivity—it purely enhances evaporative cooling.
Therefore, perspiration evaporates rapidly, making Option 4 the correct answer.
A person standing in front of a mirror finds his image larger than himself This implies that the mirror is
Detailed Explanation:
A concave mirror produces a magnified (larger) virtual image when the object is placed between the pole and focus—commonly seen in makeup/shaving mirrors.
A plane mirror always produces same-size images, a convex mirror always produces diminished images, and a cylindrical mirror with bulging side outwards distorts rather than uniformly magnifies.
Therefore, only a concave mirror produces a larger image when the person stands close enough, making Option 1 the correct answer.
Showing 21 to 29 of 29 questions
67th BPSC Prelims 2022 - General Science Chapter-wise Distribution
Chemistry
9 Qs (31%)Physics
9 Qs (31%)Biology
7 Qs (24.1%)Environmental Science
2 Qs (6.9%)Science and Technology Developments
1 Qs (3.4%)Human Health and Diseases
1 Qs (3.4%)67th BPSC Prelims 2022 - General Science Questions FAQs
Q1 How many General Science questions were asked in 67th BPSC Prelims 2022?
Q2 What is the chapter-wise question distribution for General Science in 67th BPSC Prelims 2022?
- Chemistry: 9 questions (31%)
- Physics: 9 questions (31%)
- Biology: 7 questions (24.1%)
- Environmental Science: 2 questions (6.9%)
- Science and Technology Developments: 1 questions (3.4%)
- Human Health and Diseases: 1 questions (3.4%)