SPSC CCE PAST PAPER 06-06-2026
SPSC CCE 5 years
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
موہو ڈسکنٹی نیوٹی کہاں پائی جاتی ہے؟
- Inner core and outer core
- Crust and Mantle
- Upper mantle and lower mantle
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
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
اس سوال کو وضاحت کے ساتھ پڑھیں
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
اس سوال کو وضاحت کے ساتھ پڑھیں
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
اس سوال کو وضاحت کے ساتھ پڑھیں
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
زمین کی قدیم ترین چٹانوں کی عمر معلوم کرنے کے لیے کون سا آاسوٹوپ تناسب استعمال ہوتا ہے؟
- Carbon-14 to Nitrogen-14
- Potassium-40 to Argon-40
- Uranium-238 to Lead-206
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- The age of Earth’s oldest rocks is commonly determined using the Uranium-238 → Lead-206 radioactive decay system.
- Uranium-238 decays very slowly over billions of years.
- This long half-life makes it ideal for dating ancient geological materials.
- It helps scientists estimate Earth’s age (~4.5 billion years).
Last verified on 14-06-2026
فلوروسینٹ لیمپس میں کون سی گیس استعمال ہوتی ہے؟
- Neon
- Xenon
- Argon
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Fluorescent lamps mainly use argon gas (often with a small amount of mercury vapor).
- Electric current excites the gas and produces ultraviolet (UV) light.
- The UV light then hits the phosphor coating inside the tube.
- This coating produces visible light.
- Argon helps in starting and maintaining the discharge.
Last verified on 14-06-2026
بلیک ہولز کے آہستہ آہستہ ختم ہونے کی وضاحت کون سا تصور کرتا ہے؟
- Hawking radiation
- Dark energy repulsion
- Gravitational wave emission
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Black holes may eventually evaporate due to Hawking radiation.
- This is a theoretical process where black holes emit tiny amounts of radiation.
- Over a very long time, they lose mass and energy.
- As mass decreases, the black hole slowly shrinks.
- Eventually, it can completely evaporate.
Last verified on 14-06-2026
ورم ہول کا نظریاتی کام کیا ہوتا ہے؟
- A region where time stops
- A black hole that emits radiation
- A tunnel connecting two distant points in space time
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- A wormhole is a theoretical structure that acts as a tunnel connecting two distant points in space-time.
- It is a solution from Einstein’s general relativity equations.
- It could, in theory, allow shortcuts between far parts of the universe.
- It may also connect different times or regions of space.
Last verified on 14-06-2026
بلیک ہول کا شوارزشلڈ رداس کیا ہوتا ہے؟
- The radius of the accretion disk
- The radius at which escape velocity equals the speed of light
- The radius where nuclear fusion stops
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- The Schwarzschild radius is the distance from a black hole where the escape velocity becomes equal to the speed of light.
- If an object comes within this radius, even light cannot escape.
- It defines the event horizon of a non-rotating black hole.
- It depends only on the mass of the object.
Last verified on 14-06-2026
دور کی کہکشائیں جتنی زیادہ دور ہوں، اتنی زیادہ تیزی سے دور جاتی کیوں دکھائی دیتی ہیں؟
- Hubble's law
- Newton's law of gravitation
- Doppler effect
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- The observation that distant galaxies move away faster is explained by Hubble’s Law.
- It states that the recessional velocity of galaxies is directly proportional to their distance.
- So, the farther a galaxy is, the faster it appears to move away.
- This is evidence that the universe is expanding.
- It is based on redshift observations of light from galaxies.
Last verified on 14-06-2026
