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۔
جب حدی تعدد سے زیادہ روشنی ڈالی جائے تو روشنی کی شدت بڑھانے سے بنیادی طور پر کیا بڑھتا ہے؟
- Threshold frequency itself
- Number of emitted electrons
- Mass of the electrons
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Photoelectric Effect states that when light frequency exceeds the threshold frequency, electrons are emitted from the metal surface.
- Increasing the intensity of light increases the number of photons striking the surface.
- More photons cause more electrons to be emitted, but the energy of each electron depends on frequency.
Last verified on 25-05-2026
وہ کون سی مدوجزر پیدا ہوتی ہے جب سورج اور چاند ایک دوسرے کے قائمہ زاویے پر کھینچاؤ ڈالیں اور مدوجزر کا اثر کم ہو جائے؟
- Neap tide
- High tide
- Spring tide
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Neap Tide occurs when the Sun and Moon are at right angles to the Earth.
- Their gravitational forces partly cancel each other, producing weaker tides.
- Neap tides usually occur during the first and third quarter phases of the Moon.
Last verified on 25-05-2026
مقامی فراہمی اور آبپاشی کے لیے زیرِ زمین پانی نکالنے میں کون سا ذریعہ خاص طور پر اہم ہے؟
- Tube wells
- Flood channels
- Glaciers only
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Groundwater is commonly extracted through tube wells for drinking water and irrigation purposes.
- Tube wells use pumps to bring underground water to the surface, especially in agricultural areas.
- They are widely used in Pakistan for farming and local water supply.
Last verified on 25-05-2026
بھاری پیداواری مشینری چلانے میں استعمال ہونے والی توانائی سب سے زیادہ کس شعبے میں شمار ہوتی ہے؟
- Residential lighting sector
- Household sector
- Industrial sector
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- The Industrial Engineering sector uses heavy machines, factories, and large production equipment.
- So it consumes the highest amount of industrial energy.
- Industries require electricity, gas, coal, and fuel to run manufacturing plants and machinery.
- Heavy industries like steel, cement, textile, and automobile production are major energy consumers.
Last verified on 25-05-2026
توانائی کے چھوٹے پیکٹس کو کیا کہا جاتا ہے؟
- Atoms
- Quanta
- Waves
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Energy is not continuous; it exists in small packets.
- These packets are called quanta (singular: quantum).
- Light energy is carried in quanta called photons.
- This idea is part of quantum theory.
- It explains atomic and subatomic behavior of energy.
Last verified on 24-05-2026
تھریش ہولڈ فریکوئنسی کی تعریف کیا ہے؟
- Average frequency
- Random frequency
- Minimum frequency to emit electrons
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Threshold frequency is a concept of the photoelectric effect.
- It is the minimum frequency of light needed to remove electrons from a metal surface.
- Below this frequency, no electrons are emitted.
- Different metals have different threshold frequencies.
- This concept was explained by Albert Einstein in 1905.
Last verified on 24-05-2026
مد و جزر کی قوت بنیادی طور پر کس وجہ سے پیدا ہوتی ہے؟
- Wind
- Moon gravity
- Sun heat
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Tidal forces are mainly caused by the Moon’s gravitational pull.
- The Moon attracts Earth’s oceans, creating high and low tides.
- The Sun also affects tides but less than the Moon.
- Tides occur regularly due to Earth-Moon interaction.
- Coastal areas experience noticeable tidal changes daily.
Last verified on 24-05-2026
زمین کے اندر موجود پانی فراہم کرنے کا ذریعہ کون سا ہے؟
- Rivers
- Dams
- Tube wells
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Tube wells extract water from underground layers called aquifers.
- They are widely used for irrigation and drinking water.
- Water is pumped to the surface using electric or diesel pumps.
- Tube wells are important in agricultural areas.
- They help where surface water is limited.
Last verified on 24-05-2026
کون سا شعبہ توانائی کو زیادہ تر مشینری اور پیداوار کے لیے استعمال کرتا ہے؟
- Industrial
- Commercial
- Transport
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- The industrial sector uses energy for manufacturing and machinery.
- Factories require electricity and fuel for production processes.
- Heavy industries consume large amounts of energy daily.
- Industries are important for economic growth and employment.
- Common industrial energy sources include electricity, gas, and coal.
Last verified on 25-05-2026
قدرتی گیس کا اہم جزو کونسا ہے؟
- Methane
- Ethane
- Propane
- Chlorine
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Natural gas contains about 80% to 95% methane.
- It is a hydrocarbon fuel.
- It is the chief (major) component of natural gas.
- It is also a greenhouse gas.
- Chemical formula: CH₄
- It is a clean-burning fuel used in daily life.
Last verified on 07-05-2026
