COMBINED COMPETITIVE EXAMINATION PAPER 2026
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
گھومتے ہوئے آئس اسکیٹر کے ہاتھ اندر کرنے سے رفتار کیوں بڑھ جاتی ہے؟
- Increase in torque
- Increase in kinetic energy from muscles
- Conservation of angular momentum
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- A spinning ice skater speeds up when pulling arms inward due to conservation of angular momentum.
- When arms are pulled in, the moment of inertia decreases.
- To keep angular momentum constant, angular velocity increases.
- So the skater spins faster without any external force.
- This is a classic example of rotational motion in physics.
Last verified on 14-06-2026
سائیکل چلنے کی حالت میں مستحکم کیوں رہتی ہے لیکن کھڑی ہونے پر آسانی سے گر جاتی ہے؟
- Friction increases at higher
- Gyroscopic effect of rotating wheels
- Air resistance stabilizes motion
- None of these
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Explanation
- A bicycle stays stable in motion due to the gyroscopic effect of rotating wheels, which resists tilting.
- When the wheels spin, they create angular momentum that keeps the bicycle balanced.
- At rest, there is no rotation, so no gyroscopic stability is produced.
Last verified on 14-06-2026
ذیابیطس میلیٹس میں بار بار پیشاب آنے کی کیا وجہ ہے؟
- Glucose reduces ADH secretion
- Insulin increases water excretion
- Glucose increases osmotic pressure in renal tubules
- None of these
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Explanation
- Diabetes mellitus causes polyuria because glucose increases osmotic pressure in renal tubules, pulling more water into urine.
- High blood sugar exceeds the renal threshold (~180 mg/dL), so glucose appears in urine (glycosuria).
- This extra glucose draws water with it, increasing urine volume (osmotic diuresis).
- Normal blood glucose is about 90–100 mg/dL (fasting).
Last verified on 14-06-2026
ورزش کے دوران دل کی دھڑکن کیوں بڑھ جاتی ہے؟
- Increased vagal stimulation
- Decreased oxygen demand
- Increased sympathetic stimulation releasing norepinephrine
- None of these
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Explanation
- Heart rate increases during exercise due to increased sympathetic nervous system activity releasing norepinephrine.
- This prepares the body for higher oxygen and energy demand.
- It increases heart pumping strength and speed.
- More blood reaches muscles for ATP production.
- This is a normal physiological response during physical activity.
Last verified on 14-06-2026
جگر کے خلیوں میں ادویات کو زہریلے اثرات سے پاک کرنے میں سب سے زیادہ کون سا عضو حصہ لیتا ہے؟
- Smooth endoplasmic reticulum
- Lysosome
- Mitochondria
- None of these
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Explanation
- The smooth endoplasmic reticulum (SER) is responsible for drug detoxification in liver cells.
- It contains enzymes that break down harmful drugs and toxins.
- This process makes substances less toxic and easier to excrete.
- Liver cells have abundant SER for this function.
Last verified on 14-06-2026
الکحل اعصابی نظام کو سست کرنے والا مادہ کیوں ہے؟
- It accelerates nerve conduction
- It blocks dopamine receptors
- It enhances GABA activity
- None of these
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Explanation
- Alcohol acts as a depressant because it enhances GABA activity in the brain, which slows nerve signals.
- GABA is an inhibitory neurotransmitter that reduces brain activity.
- This leads to relaxation, slower reactions, and reduced coordination.
- Alcohol also suppresses excitatory signals.
- That is why it causes drowsiness and impaired judgment.
Last verified on 14-06-2026
سرخ خون کے خلیوں میں نیوکلیس کیوں نہیں ہوتا؟
- To maximize space for hemoglobin
- To reduce oxygen consumption
- To increase lifespan
- None of these
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Explanation
- Red blood cells lack a nucleus to maximize space for hemoglobin, which carries oxygen.
- More hemoglobin means more oxygen transport.
- This makes RBCs highly efficient for gas exchange.
- Lack of nucleus also gives them a flexible shape.
- This helps them pass through narrow blood capillaries.
Last verified on 14-06-2026
معدہ ہائیڈروکلورک ایسڈ کیوں خارج کرتا ہے؟
- To absorb glucose
- To dissolve fats
- To activate pepsinogen into pepsin
- None of these
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Explanation
- The stomach secretes hydrochloric acid (HCl) to activate pepsinogen into pepsin for protein digestion.
- HCl creates an acidic environment in the stomach.
- This acidity helps enzymes work properly.
- It also kills harmful microbes in food.
- Thus, it supports digestion and protection.
Last verified on 14-06-2026
کم وقت میں بہت زیادہ پانی پینے سے نقصان کیوں ہوتا ہے؟
- Water increases blood viscosity
- Kidneys stop filtering water
- Excess water dilutes sodium levels in blood
- None of these
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Explanation
- Drinking too much water quickly causes harm because it dilutes sodium levels in the blood (hyponatremia).
- Low sodium disrupts normal nerve and muscle function.
- Cells may swell due to water imbalance.
- This can affect brain function and become dangerous.
Last verified on 14-06-2026
شدید ورزش کے دوران پٹھوں میں لیکٹک ایسڈ کیوں جمع ہوتا ہے؟
- Carbon dioxide accumulates excessively
- Oxygen supply is insufficient for aerobic respiration
- Muscle fibers break down proteins
- None of these
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Explanation
- Lactic acid builds up in muscles because oxygen supply becomes insufficient during intense exercise.
- Muscles switch to anaerobic respiration for quick energy.
- This produces lactic acid as a by-product.
- Accumulation causes muscle fatigue and burning sensation.
- It is a temporary process until oxygen levels recover.
Last verified on 14-06-2026
