EVERYDAY SCIENCE
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
ضیائی تالیف کے عمل میں خارج ہونے والی آکسیجن کا ذریعہ کیا ہے؟
- Water
- Salt
- Mineral
- None of these
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Explanation
- During photosynthesis, water molecules are split in the light-dependent reactions. This process is called photolysis.
- The oxygen released into the atmosphere comes from water (H₂O).
- The splitting of water also provides electrons and hydrogen ions needed for photosynthesis.
Last verified on 31-10-2026
ایچ آئی وی کے بارے میں درج ذیل میں سے کون سا بیان غلط ہے؟
- It does not cause AIDS
- It's a retrovirus
- It's surrounded by an envelop
- It cause deficiency of human
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Explanation
- HIV (Human Immunodeficiency Virus) causes AIDS (Acquired Immunodeficiency Syndrome).
- HIV is an enveloped retrovirus that attacks CD4 T-helper cells.
- It weakens the immune system, making the body more vulnerable to infections.
Last verified on 31-10-2026
- Serine
- Glucose
- Alanine
- None of these
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Explanation
- Alanine is an α-amino acid with the molecular formula C₃H₇NO₂.
- It contains an amino group (–NH₂), a carboxyl group (–COOH), and a methyl group (–CH₃).
- Alanine is one of the 20 standard amino acids used to build proteins.
Last verified on 31-10-2026
خون کے گروپ او والا شخص کن بلڈ گروپس کو خون عطیہ کر سکتا ہے؟
- A and O
- A, B, AB, O
- AB only
- None of these
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Explanation
- O-negative (O−) red blood cells can generally be donated to all ABO and Rh blood groups, making O− the universal red-cell donor.
- O-positive (O+) red blood cells can be donated to O+, A+, B+, and AB+ recipients.
Last verified on 30-10-2026
خصیوں کے اندر سپرم کس حصے میں پیدا ہوتے ہیں؟
- Collecting Duct
- Seminiferous tubules
- Sperm Duct
- None of these
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Explanation
- Seminiferous tubules are tiny, highly coiled tubes inside the testes where sperm are produced through a process called spermatogenesis.
- The testes also produce testosterone, the primary male sex hormone.
- After production, sperm mature further in the epididymis, where they are stored temporarily.
Last verified on 30-10-2026
مدافعتی نظام کے افعال اور اس کی خرابیوں کے مطالعے کو کیا کہتے ہیں؟
- Immunology
- Immunity
- Immune response
- None of these
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Explanation
- Immunology is the branch of biology and medicine that studies the immune system, its functions, and its disorders.
- Immunity is the body's ability to resist infections and harmful substances.
Last verified on 30-10-2026
- Aspirin
- Resorcinol
- Picric acid
- None of these
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Explanation
- Picric acid is the common name for 2,4,6-trinitrophenol.
- It contains one hydroxyl group (–OH) and three nitro groups (–NO₂) at positions 2, 4, and 6.
- Its molecular formula is C₆H₃N₃O₇.
Last verified on 30-10-2026
درج ذیل میں سے کون سا مرکب ٹولینز ری ایجنٹ کے ساتھ سلور ٹیسٹ دیتا ہے؟
- C₆H₅OH
- HCHO
- CH₃–O–CH₃
- None of these
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Explanation
- HCHO (formaldehyde) is an aldehyde and gives a positive Tollens' test.
- Tollens' reagent oxidizes the aldehyde and reduces silver ions to metallic silver.
- A shiny silver mirror forms on the inner wall of the test tube.
Last verified on 30-10-2026
آئیوڈوفارم ٹیسٹ میں ایتھانول کی موجودگی کی تصدیق کس مشاہدے سے ہوتی ہے؟
- Yellow crystal
- Colorless crystal
- Red crystal
- None of these
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Explanation
- Ethanol gives a positive iodoform test when treated with iodine and sodium hydroxide.
- A yellow precipitate of iodoform (CHI₃) is formed.
- Iodoform has a characteristic antiseptic smell.
Last verified on 30-10-2026
پہلے درجے کے تعامل کے لیے ریٹ کانسٹنٹ کی اکائی کیا ہوتی ہے؟
- s⁻¹
- dm³ mol⁻¹ s⁻¹
- mol dm⁻³ s⁻¹
- None of these
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Explanation
- For a first-order reaction, the rate constant has the unit of inverse time.
- Its SI unit is s⁻¹.
- The unit remains the same regardless of the concentration unit used.
Last verified on 30-10-2026
