BPSC EVERYDAY SCIENCE 25 YEARS PAST PAPERS
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
اونچی لہریں کب پیدا ہوتی ہیں؟
- Sun and Moon act in opposition
- Gravitational forces align
- Wind speed increases
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- High tides occur when the gravitational pull of the Moon and Sun align.
- This happens during new moon and full moon phases.
- Their combined force produces stronger tides (spring tides).
Last verified on 06-05-2026
صنعتی سرگرمیوں میں اضافہ براہِ راست کس چیز کا باعث بنتا ہے؟
- Increase in energy consumption
- No effect on energy
- Reduction in fuel use
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Industrial growth requires more machinery, production, and transport.
- All these processes need more energy to operate.
- Therefore, increased industrial activity directly leads to higher energy consumption.
- Most industries rely on fossil fuels and electricity.
Last verified on 06-05-2026
قدرتی گیس کو صاف ایندھن کیوں سمجھا جاتا ہے؟
- Emits less carbon dioxide
- Produces solid waste
- Is non-flammable
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Natural gas burns more cleanly than other fossil fuels.
- It produces less carbon dioxide (CO₂) and fewer pollutants.
- This makes it more environmentally friendly compared to coal and oil.
- Main component of natural gas is methane (CH₄).
- It is widely used for cooking, heating, and electricity generation.
Last verified on 06-05-2026
قابلِ تجدید توانائی کے ذرائع کو غیر قابلِ تجدید ذرائع سے کون سی خصوصیت ممتاز کرتی ہے؟
- Limited supply
- Natural replenishment
- Fossil origin
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Renewable energy sources are naturally replenished over time.
- They do not run out quickly and can be used repeatedly.
- It is environment-friendly and reduces pollution.
- In contrast, non-renewable sources have limited supply and take millions of years to form.
- Non-renewable sources like coal and oil are finite and exhaustible.
Last verified on 06-05-2026
سرجری میں لیزر بیم کو کس وجہ سے ترجیح دی جاتی ہے؟
- Low energy
- Color variation
- Precision and focus
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Laser beams are highly focused and precise.
- They can target very small areas without damaging surrounding tissues.
- This makes them ideal for delicate surgical procedures.
- Lasers reduce bleeding and infection risk during surgery.
- Commonly used in eye, skin, and dental surgeries.
Last verified on 06-05-2026
کسی عنصر کے آئسوٹوپس میں کون سی خاصیت تبدیل نہیں ہوتی؟
- Mass number
- Chemical behavior
- Atomic mass
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Isotopes of an element have the same number of protons and electrons.
- Because of this, their electronic configuration remains the same.
- Hence, their chemical behavior does not change, even though mass differs.
Last verified on 06-05-2026
اگر ایک ایٹم ایک الیکٹران کھو دے تو اس پر کیا چارج ہوگا؟
- Positive
- Negative
- Neutral
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- An electron carries a negative charge.
- When an atom loses one electron, it loses negative charge.
- As a result, the atom becomes positively charged (cation).
- Atoms become ions to achieve stability (octet rule).
Last verified on 06-05-2026
کون سا توانائی کا ذریعہ جغرافیائی محلِ وقوع اور موسمی تبدیلیوں سے سب سے زیادہ متاثر ہوتا ہے؟
- Nuclear energy
- Natural gas
- Solar energy
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Solar energy depends directly on sunlight availability.
- Its efficiency changes with location (latitude) and weather conditions.
- Clouds, seasons, and day length strongly affect solar power output.
- Solar energy is renewable and eco-friendly.
Last verified on 06-05-2026
کوانٹم تھیوری کے مطابق توانائی کس شکل میں خارج اور جذب ہوتی ہے؟
- Continuous waves
- Discrete packets
- Random bursts
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Quantum theory explains how energy is emitted and absorbed.
- Energy is not continuous; it is released in fixed small units.
- These units are called quanta (photons).
- This idea was introduced by Max Planck in 1900.
Last verified on 04-05-2026
فوٹو الیکٹرک ایفیکٹ یہ ظاہر کرتا ہے کہ روشنی کس طرح برتاؤ کرتی ہے؟
- Mechanical vibrations
- A continuous wave only
- A stream of particles
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- The photoelectric effect shows that light can eject electrons from a metal surface.
- This happens only when light has enough energy (frequency).
- It proves light behaves as tiny packets of energy (photons).
- This supports the particle nature of light, not just wave theory.
Last verified on 04-05-2026
