COMBINED COMPETITIVE EXAMINATION PAPER 2026
CCE 5 years Past Papers Clickhere
چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
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
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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
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
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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
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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
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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
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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
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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
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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
ایکو کارڈیوگرافی میں ڈوپلر ایفیکٹ کیسے مدد دیتا ہے؟
- It amplifies sound waves in arteries
- It measures changes in blood pressure
- It detects frequency shifts in ultrasound waves reflected by moving blood
- None of these
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Explanation
- In echocardiography, the Doppler effect is used to detect frequency changes in ultrasound waves reflected by moving blood.
- When blood flows toward the probe, frequency increases; when it moves away, it decreases.
- These shifts help measure blood flow speed and direction inside the heart.
- It allows doctors to detect blockages and valve problems.
Last verified on 14-06-2026
ایم آر آئی میں مضبوط مقناطیسی میدان کیوں استعمال کیا جاتا ہے؟
- To accelerate electrons in blood
- To align hydrogen nuclei in the body
- To heat tissues for imaging
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- MRI uses strong magnetic fields to align hydrogen nuclei (protons) in the body.
- The human body has lots of water, so hydrogen is abundant.
- When aligned, these nuclei respond to radio waves and produce signals.
- These signals are used to create detailed internal body images.
- MRI works without harmful radiation.
Last verified on 14-06-2026
