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۔
620000 N
310000
47000
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
To find the minimum external force needed to crack the windows, we can use the formula:
Force (F) = Pressure (P) × Area (A)
Given:
P = 660 kPa = 660,000 Pa (converting kPa to Pa)
Diameter (d) = 0.30 m
Radius (r) = d/2 = 0.15 m
Area (A) = πr² = π(0.15)² ≈ 0.0707 m²
Now, calculate the force:
F = P × A ≈ 660,000 Pa × 0.0707 m² ≈ 46,662 N ≈ 47,000 N
پندرہ میٹر/سیکنڈ ہوا کے خلاف مزاحمت کی ابتدائی رفتار سے زمین سے عمودی طور پر اوپر کی طرف ایک پتھر کا تخمینہ نہ ہونے کے برابر ہے۔ پتھر سے زیادہ سے زیادہ اونچائی کتنی ہے؟
110 m
23 m
11 m
None of these
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Explanation
To find the maximum height, we can use the equation: v² = u² + 2as
where:
v = final velocity (0 m/s, since it momentarily stops at the maximum height)
u = initial velocity (15 m/s)
a = acceleration due to gravity (-9.8 m/s²)
s = displacement (height)
Rearranging the equation to solve for s:
s = u² / (2 × 9.8)
s = (15)² / (2 × 9.8)
s = 225 / 19.6
s ≈ 11.48 m
c
Any speed less than c
Infinite
None of these
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Explanation
According to special relativity , particles with zero rest mass (like photons) must always travel at the speed of light (c) in a vacuum. They cannot be at rest or travel at any other speed, as they have no mass to slow them down.
کچھ ستاروں سے روشنی ______ کی وجہ سے تعدد میں واضح تبدیلی ظاہر کرتی ہے؟
Relative motion
Reflection
Diffraction
None of these
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Explanation
The apparent change in frequency of light from stars is due to the Doppler effect . It is caused by their motion relative to Earth. If a star moves toward us , its light shifts to blue (higher frequency), and if it moves away , it shifts to red (lower frequency).
ایک ورچوئل امیج ایک _____ ہے؟
Toward which light rays converge and pass through
Toward which light rays converge but do not pass through
From which light rays diverge but do not pass through
None of these
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Explanation
A virtual image is formed when light rays appear to diverge from a point but do not actually pass through it. It is seen in plane mirrors and convex lenses/mirrors when the object is within the focal point.
برقی مقناطیسی لہر کے لئے ویکٹر ایکس بی کی سمت _____ دیتا ہے؟
The direction of the wave propagation
The direction of the electromagnetic force on a proton
The direction of the electric field
None of these
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Explanation
In an electromagnetic wave , the electric field (E) and magnetic field (B) are perpendicular to each other , and their cross product ( E × B ) gives the direction of wave propagation. This follows from Maxwell’s equations , which describe the movement of EM waves in space.
صفحے کے ہوائی جہاز میں تار کا ایک مربع لوپ ہے۔ مقناطیسی فیلڈ میں کمی کا صفحہ میں ہدایت کی گئی ہے۔ لوپ میں حوصلہ افزائی موجودہ ____ ہے؟
Zero
Clockwise
Counterclockwise
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Lenz's Law states that the induced current opposes the change in magnetic flux. Since the magnetic field is decreasing and directed into the page , the loop induces a current to oppose the decrease by creating a field into the page . To achieve this, the induced current must flow counterclockwise .
ایک مستقل کرنٹ ایک ہیلیکل کنڈلی کے ذریعے خیمہ ہے۔ کنڈلی ______؟
Produces zero magnetic field at its center
Tends to get shorter
Tends to get longer
None of these
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Explanation
When a constant current passes through a helical coil , it generates a magnetic field along its axis, similar to a solenoid. The electromagnetic forces between the coil’s turns act inward , causing the coil to contract and shorten rather than expand.
ایک کھوکھلی دھات کے دائرے سے کسی ممکنہ وی سے معاوضہ لیا جاتا ہے۔ اس کے مرکز میں صلاحیت _____ ہے؟
2V
-V
V
None of these
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Explanation
Inside a hollow conducting sphere , the electric field is zero due to electrostatic shielding. Since there is no electric field inside, the potential remains constant throughout the sphere, including at the center. Therefore, the potential at the center is V , the same as the surface.
h/4
h/3
h/2
None of these
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Explanation
The total mechanical energy (kinetic + potential) remains constant. Initially, the object has total energy E = K + U = mgh . When it loses 1/3 of its kinetic energy, the remaining kinetic energy is 2/3 of the initial value. Using energy conservation, solving for height gives h/2 .
