JEST 5 YEARS PAST PAPERS PDF
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
کیا تھرموڈائنامک نظام میں کیا گیا کام ایک اسٹیٹ فنکشن ہے؟
False
True
Only sometimes
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
In thermodynamics , state functions depend only on initial and final states. They do not depend on the path taken. Examples include internal energy, enthalpy, and entropy . Work done depends on the path of the process. Therefore, it is not a state function . Last verified on 11-04-2026
نمک اور پانی کے مرکب کو الگ کر کے دونوں اجزاء حاصل کرنے کے لیے کون سا طریقہ استعمال کیا جاتا ہے؟
Evaporation
Distillation
Crystallization
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
A salt and water mixture is a homogeneous solution. To separate both components , we need a method that recovers water and salt separately. Some methods only recover one component. Proper separation depends on physical properties like boiling point. Distillation is used for complete separation of both substances. Last verified on 11-04-2026
مناسب درجہ حرارت سے زیادہ درجہ حرارت انزائم کی کارکردگی کیوں کم کر دیتا ہے؟
It accelerates substrate product complex formation
It increases substrate bonding
It alters the enzyme's structure
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Enzymes work best at an optimum temperature. Temperature changes affect enzyme activity and shape. High temperature can damage enzyme structure . This reduces the enzyme’s ability to function properly. Enzymes are sensitive biological catalysts. Last verified on 11-04-2026
پیشاب کے اخراج کا درست ترتیب کیا ہے؟
Kidney → Urethra → Urinary Bladder → Ureter
Kidney → Ureter → Urinary Bladder → Urethra
Kidney → Urinary Bladder → Ureter → Urethra
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
The human urinary system functions as a sequence of organs that filter blood and eliminate waste in a specific order:
Kidney : The starting point where blood is filtered and urine is formed. Ureter : Narrow, tubular structures that transport the formed urine from the kidneys down to the bladder. Urinary Bladder : A muscular sac in the pelvic cavity that acts as a temporary storage reservoir for urine. Urethra : The final canal-shaped tube through which urine is expelled from the body to the exterior. Last verified on 11-04-2026
صحرا کے ماحولیاتی نظام میں ثانوی صارفین (سانپوں) کی آبادی کم ہو جائے تو اس کا سب سے ممکنہ نتیجہ کیا ہوگا؟
Termination of the population of primary consumers
Increase in the population of primary consumers
Decrease in the population of primary consumers
None of these
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Explanation
Snakes normally control the population of primary consumers . When snakes decrease , predation pressure reduces. As a result, primary consumers (like rodents, insects) increase. This can disturb ecological balance in the desert ecosystem. Last verified on 11-04-2026
ایک نوزائیدہ بچے میں ڈاؤن سنڈروم کی رپورٹ میں گیمیٹس کی تشکیل میں غلطی ظاہر ہوئی ہے۔ یہ حالت کس وجہ سے پیدا ہوتی ہے؟
Alternation in cell division checkpoints
Improper segregation of homologous chromosomes
Crossing over between non-sister chromatids
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
This condition is caused by nondisjunction during meiosis. Homologous chromosomes fail to separate properly in meiosis I (or sister chromatids in meiosis II). As a result, one gamete gets an extra chromosome. After fertilization, this leads to trisomy 21 (Down syndrome). Last verified on 11-04-2026
لامارکزم کو بہترین طور پر کیسے بیان کیا جاتا ہے؟
Inheritance is affected by the use and disuse of organs
Change is driven by the struggle for existence
Acquired characters are determined by genetic makeup
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Lamarckism is an early evolutionary theory proposed by Jean-Baptiste Lamarck . It states that organs become stronger if used and weaker if not used. These acquired characteristics were believed to be passed to offspring For example, stretching of giraffe neck over generations. Hence, it is based on use and disuse of organs . Last verified on 12-04-2026
ایک انزائم کے تجربے میں کیمیکل ایکس (جو سبسٹریٹ سے ساخت میں ملتا جلتا ہے) شامل کرنے سے پروڈکٹ بننا بند ہو جاتا ہے۔ لیکن سبسٹریٹ کی مقدار بڑھانے سے دوبارہ ردِعمل شروع ہو جاتا ہے۔ یہ کون سا عمل ہے؟
Active activation
Competitive inhibition
Noncompetitive inhibition
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Competitive inhibition occurs when a substance similar to the substrate competes for the enzyme’s active site . Chemical X blocks the active site, stopping product formation. Increasing substrate concentration overcomes this effect. This restores enzyme activity. Therefore, this is competitive inhibition . Last verified on 12-04-2026
ایک چھوٹی آبادی جو ایک جزیرے میں محدود ہے، اچانک ایک آفت کا شکار ہو جاتی ہے اور %90 آبادی ختم ہو جاتی ہے۔ اس عمل کو کیا کہتے ہیں؟
Adaptive radiation
Bottleneck effect
Founder effect
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
When a sudden disaster drastically reduces a population size , it causes a loss of genetic variation. This random reduction is known as the bottleneck effect . The surviving population may not represent the original genetic diversity. It often leads to inbreeding and reduced adaptability. This is common in isolated populations like islands. Last verified on 12-04-2026
ایک طالب علم مائیکروسکوپ کے نیچے ایک امیبا کو خوراک کے ذرات کو نگلتے ہوئے دیکھتا ہے۔ یہ کیا ظاہر کرتا ہے کہ پروٹسٹ کیا ہوتے ہیں؟
Capable of heterotrophic nutrition
Only autotrophic
Macroscopic
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Amoeba engulfs food particles through phagocytosis . This shows that protists cannot make their own food. Instead, they depend on other organisms for nutrition. Such organisms are called heterotrophs . Therefore, protists are capable of heterotrophic nutrition . Last verified on 12-04-2026