BPSC EVERYDAY SCIENCE 25 YEARS PAST PAPERS
BPSC 5
years Past Papers Click
here
چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
کوانٹم نظریہ اس خیال کو رد کرتا ہے کہ ایٹمی توانائی کسی بھی مقدار میں بدل سکتی ہے کیونکہ توانائی کس شکل میں منتقل ہوتی ہے؟
- Separate packets
- Mechanical waves only
- Random intervals
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Quantum theory states that energy is not emitted or absorbed continuously.
- Instead, energy is exchanged in fixed small units called quanta.
- This idea was introduced by Max Planck in 1900.
- It explains atomic behavior and radiation more accurately than classical physics.
- Therefore, atomic energy changes occur in separate packets.
Last verified on 08-05-2026
جب آنے والی روشنی کی تعدد حدِ آستانہ سے کم ہو تو فوٹو الیکٹرک اثر کیا ہوگا؟
- Depend only on intensity
- Increase sharply
- Stop completely
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- The photoelectric effect occurs when light ejects electrons from a metal surface.
- Each metal has a minimum required frequency called the threshold frequency.
- If the incident light frequency is below this value, electrons are not emitted.
- Increasing intensity cannot overcome insufficient frequency.
- Therefore, the photoelectric effect stops completely.
Last verified on 08-05-2026
زمین پر عام سمندری مدوجزر پیدا کرنے میں سب سے زیادہ غالب کششِ ثقل کس آسمانی جسم کی ہوتی ہے؟
- Moon
- Jupiter
- Mars
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Ocean tides on Earth are caused by gravitational forces.
- The strongest and most influential source is the nearest large celestial body.
- Although the Sun also contributes, its effect is weaker than expected due to distance.
- The Moon’s proximity makes its gravitational pull dominant in tidal formation.
- Therefore, the Moon is the main driver of ordinary ocean tides.
Last verified on 08-05-2026
گھریلو کھانے پکانے اور حرارت کے لیے قدرتی گیس کو بڑے پیمانے پر استعمال کے قابل بنانے والی خصوصیت کیا ہے؟
- High ash content
- Non-combustible nature
- Easy pipeline supply and clean burning
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Natural gas is widely used for cooking and heating in homes.
- It is efficient, convenient, and relatively clean compared to other fossil fuels.
- It can be transported easily through pipelines.
- It burns with less pollution and no solid residue (ash).
- Its main advantage is safe, continuous, and clean supply.
Last verified on 08-05-2026
کون سا توانائی کا ذریعہ قدرتی طور پر دوبارہ پیدا ہوتا ہے اور ختم ہونے والے فوسل ایندھن پر منحصر نہیں ہے؟
- Coal
- Natural gas
- Wind energy
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Energy sources are divided into renewable and non-renewable.
- Renewable energy is naturally replenished and does not run out.
- Fossil fuels like coal, petroleum, and natural gas are exhaustible.
- Wind energy is continuously available in nature.
- It is clean and does not depend on limited reserves.
Last verified on 08-05-2026
اگر کسی زندہ خلیے سے نیوکلئیس نکال دیا جائے تو سب سے پہلے کون سا خلیاتی عمل متاثر ہوگا؟
- Storage of water
- Surface protection
- Control of activities
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- The nucleus is the control center of the cell.
- It contains genetic material (DNA) that directs all cell activities.
- Without the nucleus, the cell loses coordination and regulation.
- Basic processes like growth, protein synthesis, and division stop.
- The most fundamental function affected first is control of activities.
Last verified on 08-05-2026
ایک بچے کی خوراک توانائی فراہم کرتی ہے لیکن جسم بنانے والے اہم غذائی جز سے محروم ہے۔ کس غذائی جز کی کمی سب سے زیادہ متعلق ہے؟
- Carbohydrates
- Fats
- Proteins
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Body-building nutrients are essential for growth and repair of tissues.
- The main body-building nutrient is proteins.
- Lack of proteins in children leads to poor growth and weakness.
- Protein deficiency is most directly linked to impaired body development.
Last verified on 08-05-2026
ایک ایسی شعاع کی ضرورت ہے جو تنگ اور سیدھے راستے میں کم پھیلاؤ کے ساتھ سفر کرے۔ اس مقصد کے لیے لیزر روشنی کی کون سی خصوصیت موزوں ہے؟
- Low brightness
- Directionality
- Divergence
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Laser light has special properties that make it highly useful in science and technology.
- It travels in a very narrow and straight path.
- This property is called directionality (or high collimation).
- It allows the beam to stay focused over long distances.
- That is why lasers are used in cutting, communication, and medical tools.
Last verified on 08-05-2026
وہ ایٹم جو مختلف عناصر سے تعلق رکھتے ہوں لیکن ان کا کمیت نمبر ایک جیسا ہو، انہیں کیا کہتے ہیں؟
- lons
- Isobars
- Isotopes
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Atoms are classified based on atomic number and mass number.
- When atoms of different elements have the same mass number, they are called isobars.
- Mass number = protons + neutrons.
- Isobars have different atomic numbers but equal mass numbers.
- They are not chemically identical elements.
Last verified on 08-05-2026
کون سا تابکار اخراج کوئی چارج نہیں رکھتا اور اس لیے برقی یا مقناطیسی میدان میں مڑتا نہیں ہے؟
- Alpha radiation
- Gamma radiation
- Beta radiation
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Radioactive emissions include alpha, beta, and gamma rays.
- Charged particles are deflected in electric and magnetic fields.
- Neutral radiation does not show deflection.
- Gamma rays are electromagnetic waves with no charge.
- Therefore, they pass straight without deviation.
Last verified on 08-05-2026