PPSC PAST PAPERS EVERYDAY SCIENCE MCQS 2026
پیپر میں جانے سے
پہلے یہ سوالات و سلیبس ایک بار ضرور پڑھ کر جائیں
PPSC 25
years Past Papers Click here
چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
مندرجہ ذیل میں سے کون سی گیس سب سے تیزی سے پھیلتی ہے؟
- Hydrogen
- Chlorine
- Fluorine
- Helium
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Hydrogen is typically the gas that diffuses the fastest because it has the lowest molar mass.
Molecular weight of 2.016 g/mol.
According to Graham's Law of Diffusion, the rate of diffusion of a gas is inversely proportional to the square root of its molecular weight.
Therefore, hydrogen diffuses the fastest.
فتوسنتھیسس کے دوران پیدا ہونے والا بنیادی مالیکیول ______ ہے؟
- Glucose
- Amino acid
- Fatty acid
- Nucleotide
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Explanation
The fundamental molecule produced during photosynthesis is glucose
Key Product: Glucose (sugar/carbohydrate) is the main energy-storing molecule.
Purpose: It is used for plant respiration and as a building block for cellulose.
By-product: Oxygen is also produced and released into the atmosphere
جب درختوں اور فوسل فیول کو جلایا جاتا ہے تو کون سی گیس پیدا ہوتی ہے؟
- Carbon monoxide
- Carbon dioxide
- Nitrogen oxide
- Oxygen
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Carbon dioxide (CO2) is produced when trees and fossil fuels are burned, through a process called combustion.
- Combustion releases carbon dioxide and water vapor into the atmosphere.
فوڈ چین میں لیولز کی صحیح ترتیب کیا ہے؟
- Producer → Consumer → Decomposer
- Consumer → Producer → Decomposer
- Decomposer → Producer → Consumer
- Consumer → Decomposer → Producer
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Explanation
The correct order of the levels in a food chain is:
- Producer (plants and algae that produce their own food through photosynthesis)
- Consumer (animals that eat producers or other consumers)
- Decomposer (organisms like bacteria and fungi that break down dead plants and animals)
Last updated 17-02-2026
نظام شمسی میں کون سا سیارہ سب سے زیادہ کثافت رکھتا ہے؟
- Saturn
- Earth
- Jupiter
- Naptune
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Earth has the highest density of any planet in the Solar System, at 5.514 g/cm3.
This is considered the standard by which other planet's densities are measured.
گرین ہاؤس اثر سے ہمارا کیا مطلب ہے؟
- Ability of atmosphere to retain water vapor
- Ability of atmospheric gases to trap heat
- Ability to keep the planet relatively warm
- Ability of cloud to scatter electromagnetic radiation
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Explanation
- The greenhouse effect occurs when certain gases in the atmosphere trap heat from the Sun.
- Key greenhouse gases include CO₂, CH₄ (methane), N₂O, and water vapor.
- These gases allow sunlight to enter but absorb and re-radiate infrared radiation back to Earth.
- This process warms the planet, making life possible.
