EVERYDAY SCIENCE
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
جب سورج، زمین اور چاند کس حالت میں ہوں تو مدّ و جزر سب سے زیادہ ہوتے ہیں؟
- Random position
- Opposite motion
- Straight line
- None of these
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Explanation
- Highest tides are called Spring tides.
- They occur when the Sun, Earth, and Moon are aligned in a straight line.
- Their gravitational forces combine and produce very high and very low tides.
Last verified on 23-05-2026
کون سا شعبہ زیادہ تر توانائی گاڑیوں کے لیے استعمال کرتا ہے؟
- Transport
- Domestic
- Commercial
- None of these
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Explanation
- The transport sector uses energy mainly for running vehicles like cars, buses, trucks, trains, and airplanes.
- It depends mostly on petroleum fuels such as petrol, diesel, and CNG.
- This sector is one of the largest consumers of fossil fuels worldwide.
Last verified on 23-05-2026
گھروں میں قدرتی گیس زیادہ تر کس مقصد کے لیے استعمال ہوتی ہے؟
- Cooking and heating
- Transport only
- Mining
- None of these
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Explanation
- Natural gas is commonly used in homes for cooking food and heating water or rooms.
- It is a fossil fuel mainly composed of methane gas.
- It burns cleaner than coal and oil.
- It producing less smoke and pollution.
Last verified on 23-05-2026
کون سا توانائی کا ذریعہ بہتے ہوئے پانی سے چلنے والی ٹربائنز پر منحصر ہوتا ہے؟
- Hydro
- Solar
- Biomass
- None of these
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Explanation
- Hydroelectric energy uses flowing or falling water to rotate turbines and generate electricity.
- Dams are commonly built on rivers for hydroelectric power production.
- It is one of the oldest and clean renewable energy sources.
Last verified on 23-05-2026
کون سا حصہ مادّوں کے اندر اور باہر جانے کو کنٹرول کرنے والی رکاوٹ کا کام کرتا ہے؟
- Nucleus
- Cell membrane
- Cytoplasm
- None of these
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Explanation
- The cell membrane is a thin protective layer surrounding the cell.
- It controls the movement of substances into and out of the cell.
- It is also called the plasma membrane.
- It is selectively permeable.
Last verified on 23-05-2026
درج ذیل میں سے کون سی غذا جسم کی نشوونما اور بافتوں/پٹھوں کی مرمت میں مدد دیتی ہے؟
- Carbohydrates
- Vitamins
- Proteins
- Minerals
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Explanation
- Proteins are called body-building foods.
- They help in growth, repair of tissues, and muscle development.
- They are essential for maintaining and rebuilding body cells.
- They are made of amino acids, the building blocks of the body.
- Deficiency of protein can lead to weak muscles and poor growth.
Last verified on 06-05-2026
کون سی شعاعیں نیوکلیئس سے خارج ہونے والے تیز رفتار الیکٹرانز پر مشتمل ہوتی ہیں؟
- Gamma rays
- Beta rays
- Alpha rays
- None of these
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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
اگر ایک خالص سیمی کنڈکٹر کو فاسفورس (گروپ وی عنصر) سے ڈوپ کیا جائے تو وہ کیا بنے گا؟
- P-type semiconductor
- N-type semiconductor
- Insulator
- None of these
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Explanation
- Intrinsic semiconductor is pure silicon or germanium.
- Doping changes its conductivity by adding impurities.
- Phosphorus is a Group V element (has 5 valence electrons).
- It donates extra electrons when added to silicon.
- So it increases negative charge carriers (electrons).
Last verified on 22-05-2026
ہال ایفیکٹ کس چیز کے تعین کے لیے استعمال ہوتا ہے؟
- Type of charge carriers
- Carrier concentration
- Mobility of charge carriers
- All of these
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Explanation
- The Hall Effect occurs when a magnetic field is applied perpendicular to a current-carrying conductor.
- It produces a measurable Hall voltage.
- This effect gives important information about charge carriers in a material.
- It helps identify type, number, and motion of carriers.
- So it is widely used in solid-state physics.
Last verified on 22-05-2026
ایک مثالی گیس کے آئسو تھرمل عمل میں کیا ہوتا ہے؟
- Heat added equals change in internal energy
- Heat entering the system equals work done by the system
- Work done is zero
- None of these
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Explanation
- An isothermal process occurs at constant temperature.
- For an ideal gas, internal energy depends only on temperature.
- So in isothermal process, change in internal energy is zero (ΔU = 0).
- From first law: Q = W.
- Heat supplied is completely converted into work.
Last verified on 22-05-2026
