SPSC 25 YEARS PAST PAPERS 2001 TO 2026
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
متعلقہ میکانکس جسمانی طور پر کلاسیکی میکانکس سے مختلف نتائج پیدا کرتا ہے؟
Zero velocity
Low velocities
Very high velocities
None of these
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Explanation
Relativistic mechanics differs from classical mechanics when objects move at speeds close to the speed of light (v ≈ c v approx c At low velocities , classical mechanics gives accurate results, but at very high velocities , effects like time dilation and mass increase become significant.
200 mF
500 mF
300 mF
None of these
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Explanation
When capacitors are connected in series, the total capacitance (C_total) is given by:
1/C_total = 1/C1 + 1/C2
Given:
C1 = 300 mF
C2 = 600 mF
1/C_total = 1/300 + 1/600
= (2 + 1) / 600
= 3 / 600
= 1 / 200
C_total = 200 mF
Body-centered cubic (BCC)
Face-centered cubic (FCC)
Simple cubic (SC)
None of these
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Explanation
Sodium chloride (NaCl) crystallizes in a face-centered cubic (FCC) lattice with Cl⁻ ions forming an FCC arrangement and Na⁺ ions occupying octahedral voids. This structure ensures high stability and strong ionic bonding in the crystal.
ایک نوڈ اور اینٹینوڈ کے درمیان مرحلے کا فرق _____ ہے؟
280°
90°
45°
None of these
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Explanation
In a standing wave , the phase difference between a node (zero displacement) and an antinode (maximum displacement) is 90° (π/2 radians) .This means that when the antinode reaches maximum displacement, the node remains at rest.
Plate
Cube
Sphere
None of these
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Explanation
The rate of cooling follows Newton’s Law of Cooling , which depends on surface area. The thin circular plate has the largest surface area-to-volume ratio. This allowing it to lose heat faster than the cube or sphere.
چاند پر خلاباز کی ریڈیو ٹرانسمیشن زمین پر کتنی دیر بعد موصول ہوگی؟ (زمین سے ملین میٹر)۔
1.27s
0.38s
0.25s
None of these
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Explanation
The distance between the Earth and the Moon is approximately 384,000 kilometers (384 million meters). Using the speed of light (c = 3 × 10⁸ m/s), time = distance/speed = 384 × 10⁶ / 3 × 10⁸ = 1.27 seconds.
میں زیادہ سے زیادہ نمٹنے کے نتائج؟ _____
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 is strong enough to prevent oscillations, causing the system to return to equilibrium slowly without oscillating . This is commonly observed in systems like heavy doors with hydraulic closers , which close slowly without bouncing.
_____ کے دوران ڈیٹا بے ترتیب رسائی میموری (رام) میں محفوظ کیا جاتا ہے؟
Enable operation
Write operation
Read operation
None of these
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Explanation
In RAM , data is stored during the write operation , where the processor transfers data to memory locations. The read operation retrieves stored data without modifying it.
a/(4/√3)
a/4/13)
al(4/12)
None of these
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Explanation
In a Body-Centered Cubic (BCC) lattice, the relation between the lattice parameter a and atomic radius r is:
4 r = 3 a Since atomic diameter = 2r , solving gives:
Atomic Diameter = 4 r 2 = a 4 / 3
موجودہ کثافت اور میگنیٹائزیشن کے مابین مندرجہ ذیل میں سے کون سا صحیح تعلق ہے؟
J = Grad(M)
J = Div(M)
J = Curl(M)
None of these
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Explanation
The correct relation between current density (J mathbf{J} M mathbf{M} is:
J = ∇ × M This equation describes how the curl of magnetization produces bound current density in magnetized materials.
