EVERYDAY SCIENCE
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
بریزنگ اور ویلڈنگ کس قسم کے عمل ہیں؟
- Hot working processes
- Cold working processes
- Mechanical processes
- None of these
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Explanation
- Brazing and welding are hot working processes.
- Because they involve the use of heat to join metals.
- In welding, metals are melted and joined together using heat.
- In brazing, a filler metal is melted to join two metal pieces without melting the base metals.
Last verified on 16-06-2026
لیبارٹری میں آنکھوں کی حفاظت کے لیے کون سا آلہ استعمال ہوتا ہے؟
- Safety goggles
- Thermometer
- Beaker
- None of these
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Explanation
- Safety goggles are used to protect eyes in the laboratory.
- They protect from chemicals, splashes, dust, and harmful particles.
- They are an essential part of lab safety equipment.
Last verified on 16-06-2026
پانی کی سختی بنیادی طور پر کن آئنز کی موجودگی کی وجہ سے ہوتی ہے؟
- Ca²⁺ and Mg²⁺ ions
- Na⁺ and K⁺ ions
- Cl⁻ and SO₄²⁻ ions
- None of these
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Explanation
- The hardness of water is mainly caused by the presence of calcium (Ca²⁺) and magnesium (Mg²⁺) ions.
- These ions react with soap and reduce its ability to form foam.
- Hard water commonly contains dissolved salts of calcium and magnesium.
- Temporary hardness is mainly due to bicarbonates.
- Permanent hardness is due to sulfates and chlorides.
- Water hardness is measured in terms of calcium carbonate (CaCO₃) equivalent.
Last verified on 14-06-2026
کون سا عمل فی یونٹ کمیت سب سے زیادہ توانائی خارج کرتا ہے؟
- Fusion of hydrogen nuclei
- Combustion of coal
- Combustion of methane
- None of these
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Explanation
- Fusion of hydrogen nuclei releases the most energy per unit mass.
- In nuclear fusion, light hydrogen nuclei combine to form helium and release huge amounts of energy.
- Fusion converts a small amount of mass into energy according to Einstein’s equation (E = mc²).
- It powers stars, including the Sun.
Last verified on 14-06-2026
ہیلوجن عناصر میں سب سے مضبوط آکسیڈائزنگ ایجنٹ کون سا ہے؟
- Chlorine
- Fluorine
- Iodine
- None of these
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Explanation
- Fluorine (F₂) is the strongest oxidizing agent among the halogens.
- It has the highest tendency to gain electrons due to its high electronegativity.
- Oxidizing power decreases down the halogen group.
- The order is: F₂ > Cl₂ > Br₂ > I₂.
- Fluorine reacts very easily with other elements.
Last verified on 14-06-2026
ایٹم میں آربیٹل بھرنے کی ترتیب کو کون سا اصول کنٹرول کرتا ہے؟
- Aufbau Principle
- Pauli Exclusion Principle
- Heisenberg Uncertainty Principle
- None of these
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Explanation
- The Aufbau Principle explains the order in which electrons fill atomic orbitals (lowest energy first).
- Electrons first occupy lower energy levels before moving to higher ones.
- This helps build the correct electronic configuration of atoms.
- It follows increasing energy order of orbitals.
- Example order: 1s → 2s → 2p → 3s → 3p → 4s …
Last verified on 14-06-2026
موہو ڈسکنٹی نیوٹی کہاں پائی جاتی ہے؟
- Inner core and outer core
- Crust and Mantle
- Upper mantle and lower mantle
- None of these
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Explanation
- Moho discontinuity is the boundary between the Earth’s crust and mantle.
- It was discovered by seismologist Andrija Mohorovičić in 1909.
- It is identified by a sudden change in seismic wave speed.
- The crust is solid outer layer, while the mantle lies beneath it.
- Depth varies from 5–70 km depending on land or ocean area.
Last verified on 02-04-2026
فینٹ ینگ سن پیراڈاکس کیا بتاتا ہے اور ابتدائی زمین کو گرم رکھنے والا اہم عنصر کون سا تھا؟
- Elevated greenhouse gas concentrations
- Higher geothermal heat flux
- Stronger magnetic shielding
- None of these
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Explanation
- The faint Young Sun paradox is resolved mainly by high greenhouse gas concentrations in early Earth’s atmosphere.
- Early Sun was about 70–75% as bright as today, so Earth should have frozen.
- But gases like CO₂, methane, and water vapor trapped heat effectively.
- This greenhouse effect kept Earth warm enough for liquid water.
Last verified on 14-06-2026
چاندلر وابل کس چیز کو کہتے ہیں؟
- Variation in Earth's orbital eccentricity
- Irregular precession of Earth's rotation axis
- Shifts in tectonic plate boundaries
- None of these
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Explanation
- Chandler wobble refers to the small irregular movement (wobble) of Earth’s rotation axis.
- It causes the geographic poles to shift slightly over time.
- This is not a change in orbit, but a change in Earth’s spin axis position.
- It occurs over a period of about 14 months (~433 days).
Last verified on 14-06-2026
زمین کے مینٹل میں سب سے زیادہ پایا جانے والا معدنیات کون سا ہے؟
- Olivine
- Feldspar
- Pyroxene
- None of these
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Explanation
- The most abundant mineral in Earth’s mantle is Olivine.
- It dominates the upper mantle, especially in the form of peridotite rocks.
- Olivine is rich in magnesium and iron.
- It forms under high pressure and temperature conditions.
Last verified on 14-06-2026
