SPSC LECTURER PHYSICS PAST PAPERS 2000 TO TILL DATE
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
ایک سادہ ماڈل میں گرم ہوا کا بغیر کسی بیرونی قوت کے اوپر اٹھنا کس وجہ سے ہوتا ہے؟
- Orographic lifting
- The low specific heat of air
- Buoyancy
- Steam rising
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Explanation
- The unforced rising of hot air in the atmosphere is due to buoyancy.
- Hot air becomes less dense than surrounding cold air.
- The surrounding denser air pushes it upward.
- This upward force is called buoyant force.
Last verified on 05-06-2026
ایک کرسٹل ڈھانچے کی دہرائی جانے والی ہستی کے نام سے جانا جاتا ہے؟
- Crystal
- Lattice
- Unit cell
- Miller indices
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Explanation
- A crystal structure is made of a repeating pattern of atoms.
- The smallest repeating part that builds the whole crystal is called the unit cell.
- By repeating the unit cell in all directions, the full crystal lattice is formed.
- It represents the basic structural unit of a crystal.
Last verified on 05-06-2026
ریپلسیو توانائی ہمیشہ کیا ہوتی ہے؟
- Negative
- Positive
- Could be either positive or negative depending on the conditions
- None of these
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Explanation
- The repulsive energy is always positive.
- It represents energy stored when particles are forced closer together.
- Work must be done against repulsive force.
Last verified on 05-06-2026
مندرجہ ذیل میں سے کون سی ٹھوس کی خاصیت نہیں ہے؟
- The solids have a high density in comparison to gasses
- Solids have definite shape
- Solids have an indefinite volume, not easily compressed
- Solids have relatively strong intermolecular force
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Explanation
- Solids are a state of matter with fixed shape and fixed volume.
- They have tightly packed particles with strong intermolecular forces.
- Because of strong forces, they are not easily compressed.
Last verified on 05-06-2026
- Less than 5 minute
- 5 minute
- More than 5 minute
- Less or more than 5 minutes depending upon the nature of the body
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Explanation
- Cooling follows Newton’s Law of Cooling.
- Rate of cooling is proportional to temperature difference with surroundings.
- At higher temperature, cooling is faster; at lower temperature, it becomes slower.
- So later stage cooling (70°C → 60°C) takes more time than earlier stage (90°C → 80°C).
Last verified on 05-06-2026
اگر سورج کا درجہ حرارت دوگنا ہو جائے تو زمین پر موصول ہونے والی توانائی کی شرح کتنی گنا بڑھ جائے گی؟
- 2
- 4
- 8
- 16
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Explanation
This uses Stefan-Boltzmann law: Energy radiated by a star ∝ T⁴If temperature of the sun becomes 2T instead of T:
Rate_new / Rate_old = (2T)⁴ / T⁴ = 2⁴ = 16
So Earth would receive 16 times more energy per second.
Last verified on 05-06-2026
مندرجہ ذیل میں سے کون سا بیان غلط ہے؟
- Rough surfaces are better radiators than smooth surfaces
- Highly polished mirror surfaces are very good radiators
- Black surfaces are better absorbs that white ones
- Black surfaces are better radiators then white ones
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Explanation
- Rough and black surfaces are good radiators of heat.
- Smooth and polished surfaces are poor radiators and good reflectors.
- Black surfaces absorb and emit heat better than white surfaces.
- Highly polished mirror surfaces reflect heat instead of radiating it.
Last verified on 05-06-2026
- r₁² / r₂²
- (r₁ / r₂)²
- (r₂ / r₁)²
- None of these
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Explanation
- Rate of heat loss is proportional to surface area of the body.
- Surface area of a sphere = 4πr².
- So, heat loss ratio = r₁² : r₂².
Last verified on 05-06-2026
اوور ڈیمپنگ کا نتیجہ کیا ہوتا ہے؟
- Slower return to equilibrium
- Faster return to equilibrium
- Equilibrium is never achieved
- Unrhythmic to equilibrium
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Explanation
- Over-damping occurs when damping force is very large.
- The system returns to equilibrium without oscillating.
- Because of strong resistance, motion becomes very slow.
- It takes more time compared to critical damping.
Last verified on 05-06-2026
فزیکل پینڈولم کا دورانیہ کیا ہوتا ہے؟
- T = 2π√(I/Mgd)
- T = 2π√(1/x)
- √T = 4¹/MgR
- All of these
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Explanation
- Physical pendulum depends on moment of inertia (I) and distance (d) from pivot to center of mass.
- Time period increases when mass is farther from pivot (larger d).
- Standard formula is T = 2π√(I/Mgd).
Last verified on 05-06-2026