ETEA GENERAL SCIENCE 25 YEARS PAST PAPERS
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
ہوا مختلف گیسوں کا مرکب ہے۔ ہوا میں نائٹروجن کا کتنا حصہ ہے؟
98%
18%
48%
78%
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Explanation
Nitrogen makes up about 78% of Earth's atmosphere,
It is the most abundant gas .
It is essential for plant growth as.
It is a key component of proteins and DNA.
Nitrogen is the chemical element with the symbol N and atomic number 7 .
It was first discovered and isolated by Scottish physician Daniel Rutherford in 1772 .
ایک کیمرہ فلم کے پچھلے حصے پر تصویر بنانے کے لیےاستعمال کرتا ہے۔
Convex lens
Concave lens
Diverging lens
None of these
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Explanation
A convex lens is thicker at the centre than at the edges.
A camera uses a convex lens to focus light rays and form an image on a piece of film or a digital sensor at the back, capturing the scene in front of it.
جانوروں کے خلیے اپنا کھانا نہیں بناتے ہیں کیونکہ ان کے پاس _____ نہیں ہے؟
Centrioles
Vacuoles
Mitochondria
Chloroplasts
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Explanation
Chloroplasts contain chlorophyll , which is essential for photosynthesis —the process by which plants make their own food.
Animal cells lack chloroplasts , so they cannot perform photosynthesis and must obtain food from external sources.
بیج کے کوٹ پر ایک سوراخ ہوتا ہے، اسے کیا کہتے ہیں؟
Radicle
Testa
Plumule
Micropyle
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Explanation
Micropyle is a small pore in the seed coat that allows water and air to enter for germination.
It also facilitates the passage of the pollen tube during fertilization.
مالیکیولز کے درمیان پرکشش قوت کس میں زیادہ مضبوط ہوتی ہے؟
Solid
Gas
Liquid
None of these
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Explanation
In solids , molecules are tightly packed, and intermolecular forces are strongest .
In liquids and gases , these forces are weaker , allowing movement and fluidity.
ایک کیمیائی عمل جو گرمی دیتا ہے اسے _____ کہا جاتا ہے؟
Synthesis
Conduction
Polymerization
Combustion
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Explanation
Combustion is a chemical reaction where a substance burns in oxygen, releasing heat and light.
It is an exothermic process, meaning it gives out heat.
آئسوٹوپس میں ایک ہی ______ ہے؟
Atomic number
Atomic mass
Neutrons
None of the above
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Explanation
Isotopes of an element have the same atomic number (number of protons). It means they have the same chemical properties and are considered the same element.
اناج کے بیجوں میں ، کوٹیلڈنز کی تعداد ______ ہے؟
2
3
4
None of these
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Explanation
Grain seeds , such as wheat and maize , belong to monocots , which have one cotyledon. But dicot plants (like beans) have two cotyledons .
Since grain seeds can refer to dicots as well, the correct general answer is 2 .
گیس کے ذرات کے مابین کشش کی طاقت ______ ہے؟
Weak
Strong
Normal
None of these
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Explanation
The force of attraction between gas particles is weak because gas molecules are far apart and move freely .
This allows gases to expand and take the shape of their container.
محدب عینک سے اضطراب کے بعد ، پرنسپل محور کے متوازی ایک کرن ______؟
Does not bend
Passes through its principal focus
Passes through centre of curvature
None of these
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Explanation
In a convex lens , a ray parallel to the principal axis bends and passes through the principal focus on the other side.
This follows the lens refraction rule in optics.
