SPSC PHYSICS 25 YEARS PAST PAPERS
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
ایک تابکار ایٹم ایکس ایک بیٹا پارٹیکل خارج کرتا ہے۔ نتیجے میں ایٹم _____؟
Must be radioactive
Has an atomic number that is one more than that of X
Has a mass number that is one less than that of X
None of these
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Explanation
Beta decay occurs when a neutron converts into a proton, emitting a beta particle (electron) and an antineutrino.The atomic number increases by 1 , but the mass number remains the same .
ایک مثالی گیس کے لئے ایک آئیسوتھرمل عمل _____ کے ذریعہ پی_وی آریگرام پر نمائندگی کیا جاتا ہے؟
A portion of a hyperbola
A horizontal line
A vertical line
None of these
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Explanation
In an isothermal process , temperature remains constant, so PV = constant , forming a hyperbolic curve on a P-V diagram. This follows Boyle’s Law (P ∝ 1/V) for an ideal gas.
ایک ذرہ پر ایک قوت قدامت پسند ہے اگر ______؟
Its work depends on the end points of every motion, not on the path between them
Its work equals the change in the kinetic energy of the particle
It obeys Newton’s Second Law
None of these
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Explanation
A conservative force (e.g., gravitational or electrostatic) depends only on the initial and final positions, not on the path taken. The work done by a conservative force can be recovered completely, unlike non-conservative forces (e.g., friction).
آئن اسٹائن کے ذریعہ متعارف کروائے جانے والے مندرجہ ذیل میں سے کون سے تصورات نے جدید کوانٹم میکانکس کی بنیاد رکھی؟
Photoelectric effect
Principle of Relativity
Theory of General Relativity
None of these
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Explanation
Einstein's explanation of the photoelectric effect (1905) introduced the concept of quantized energy (photons) , laying the foundation for quantum mechanics. This discovery led to Einstein receiving the Nobel Prize in Physics (1921) and helped develop wave-particle duality in quantum theory.
یہ دو لاشیں غیر صفر کی رفتار کے ساتھ مخالف سمتوں میں آگے بڑھ رہی ہیں ، مندرجہ ذیل میں سے کون سا بیان صحیح ہے؟
Relative velocity <= Absolute velocity
Relative velocity = Absolute velocity
Relative velocity < Absolute velocity
None of these
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Explanation
When two bodies are moving in opposite directions , their velocities are added to find the relative velocity.
Let's say the velocities of the two bodies are v1 and v2.
Relative velocity = v1 + v2
Since both velocities are non-zero and in opposite directions, the relative velocity will be greater than the absolute velocity of either body.
So, the statement " Relative velocity > Absolute velocity " is true.
کیپلر کے قانون کی مدت کا کیا تعلق ہے؟
Time period and semi-major axis
Time period and semi-minor axis
Time period and eccentricity
None of these
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Explanation
Kepler's Third Law of Planetary Motion states :
T² = (4π²/G * (M₁ + M₂)) * a³
Where:
T = Orbital Period
a = Semi-major Axis
G = Gravitational Constant
M₁ and M₂ = Masses of the two bodies (e.g., planet and star)
This law shows that the square of the orbital period (T) is proportional to the cube of the semi-major axis (a).
اگر کوئی مصنوعی سیارہ زمین کی سطح کے قریب سے گردش کر رہا ہے تو ______؟
Its kinetic energy will be maximum
Its speed is minimum
Its speed is minimum
None of these
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Explanation
When a satellite orbits close to the Earth's surface, it must travel faster to avoid falling towards the Earth due to gravity. This means its speed is maximum.
Since kinetic energy (KE) is proportional to the square of the speed (v), the kinetic energy will also be maximum:
KE = (1/2)mv^2
where m is the mass of the satellite.
So, when a satellite orbits close to the Earth's surface, its kinetic energy will be maximum.
گونج میں سیریز ایل سی آر سرکٹ کے لئے پاور فیکٹر کیا ہے؟
1
0
Infinity
None of these
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Explanation
At resonance in a series LCR circuit, the inductive reactance (XL) equals the capacitive reactance (XC), so the impedance (Z) is equal to the resistance (R).
Z = R
The power factor (PF) is the ratio of the real power (P) to the apparent power (S):
PF = P / S = R / Z
Since Z = R at resonance, the power factor is:
PF = R / R = 1
370 A/m
37 A/m
3.7 A/m
None of these
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Explanation
Magnetization (M) is the product of the magnetic field intensity (H) and the magnetic susceptibility (χ):
M = χH
Given:
χ = 3.7 × 10^-3
H = 10^4 A/m
M = (3.7 × 10^-3) × (10^4 A/m)
= 37 A/m
گاؤس ڈائیورجنس تھیوریم ______ کو تبدیل کرتا ہے؟
Surface to line integral
Surface to volume integral
Line to volume integral
None of these
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Explanation
The Gauss divergence theorem , also known as the divergence theorem, converts:
Volume integral to Surface integral
It states that the volume integral of the divergence of a vector field over a region is equal to the surface integral of the vector field over the boundary of that region.
Mathematically, it is expressed as:
∫∫∫_V (∇⋅F) dV = ∫∫_S F⋅dS
