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۔
کون سی شعاعیں نیوکلیئس سے خارج ہونے والے تیز رفتار الیکٹرانز پر مشتمل ہوتی ہیں؟
- Gamma rays
- Beta rays
- Alpha rays
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Beta radiation consists of high-speed electrons emitted from the nucleus.
- These are produced during beta decay of unstable atoms.
- They are more penetrating than alpha but less than gamma radiation.
- Beta radiation can be stopped by thin metal sheets (like aluminum).
Last verified on 06-05-2026
لیزر کو فائبر آپٹکس میں وسیع پیمانے پر کیوں استعمال کیا جاتا ہے؟
- Low coherence
- High directionality
- Color change
- None of these
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Explanation
- LASER stands for “Light Amplification by Stimulated Emission of Radiation.”
- Laser light is highly directional and travels in a narrow beam.
- Fiber optic communication requires focused and efficient light transmission.
- Due to high directionality, signal loss becomes very low.
- Lasers are widely used in communication and medical technology.
Last verified on 22-05-2026
ایسے ایٹمز جن کا ایٹمی نمبر ایک جیسا ہو لیکن نیوٹران مختلف ہوں، انہیں کیا کہتے ہیں؟
- Isotopes
- lons
- Isotones
- None of these
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Explanation
- Atoms of the same element always have the same atomic number.
- When they differ in the number of neutrons, they are called isotopes.
- Isotopes have similar chemical properties but different masses.
- The concept of isotopes was developed in the early 20th century.
Last verified on 22-05-2026
کون سی شعاع انسانی جسم میں آسانی سے داخل ہو سکتی ہے لیکن کم آئنائزنگ ہوتی ہے؟
- Gamma
- Alpha
- Beta
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Radiation is energy emitted in the form of waves or particles.
- Different types include alpha, beta, and gamma radiation.
- Gamma rays have the highest penetration power.
- They are less ionizing compared to alpha particles but more penetrating.
- Gamma radiation can pass through the human body easily.
Last verified on 22-05-2026
پروٹون کے مقابلے میں کس ذرّے کی کمیت نہ ہونے کے برابر ہوتی ہے؟
- Electron
- Proton
- Nucleus
- None of these
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Explanation
- Atoms are made of protons, neutrons, and electrons.
- Protons and neutrons are heavy particles located in the nucleus.
- Electrons are very light compared to protons.
- Electron mass is almost negligible in atomic calculations.
- That is why electron is considered the lightest fundamental particle in this context.
Last verified on 22-05-2026
کون سا توانائی کا ذریعہ بجلی پیدا کرنے کے لیے ایندھن کے جلنے کی ضرورت رکھتا ہے؟
- Coal
- Solar
- Tidal
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Electricity can be generated from different energy sources.
- Fossil fuels like coal produce electricity through combustion (burning).
- Burning coal releases heat energy that drives turbines.
- Coal is a non-renewable and conventional energy source.
Last verified on 22-05-2026
پلانک نے کوانٹم تھیوری کس کی وضاحت کے لیے پیش کی؟
- Gravity
- Atomic mass
- Blackbody radiation
- None of these
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Explanation
- Classical theory failed to explain radiation from heated objects.
- Planck proposed that energy is emitted in discrete packets (quanta).
- This successfully explained blackbody radiation behavior.
Last verified on 14-05-2026
روشنی کی فریکوئنسی بڑھنے سے کیا بڑھتا ہے؟
- Number of electron
- Intensity
- Energy of electrons
- None of these
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Explanation
- According to Planck’s theory: E = hf
- Energy (E) is directly proportional to frequency (f).
- Higher frequency light gives more energy to electrons.
- This can eject electrons with higher kinetic energy (photoelectric effect).
Last verified on 14-05-2026
نیپ ٹائڈز کس وجہ سے پیدا ہوتے ہیں؟
- Earth rotation
- Right angle position of Moon
- Strong winds
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Neap tides occur when the Sun and Moon are at right angles to Earth.
- Their gravitational pulls partially cancel each other.
- This results in the lowest difference between high and low tides.
Last verified on 14-05-2026
توانائی کا کون سا شعبہ بنیادی طور پر نقل و حمل کے لیے استعمال کرتا ہے؟
- Transport
- Industrial
- Agriculture
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Transport sector uses fuel like petrol, diesel, and gas.
- It powers vehicles for movement of passengers and goods.
- It is one of the largest energy-consuming sectors.
Last verified on 14-05-2026
