SPSC PHYSICS 25 YEARS PAST PAPERS
SPSC 5 years Past Papers Click here
Show Answers
چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
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
اس سوال کو وضاحت کے ساتھ پڑھیں
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
اس سوال کو وضاحت کے ساتھ پڑھیں
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
اس سوال کو وضاحت کے ساتھ پڑھیں
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 .
چونکہ ایک مثالی گیس میں دباؤ میں اضافہ ہوتا ہے جس میں اوسطا سالماتی رفتار _____ ہے؟
Stays the same
Decreases at high temperature
Increases at high temperature, decreases at low
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
In an isothermal process , temperature remains constant , and the average molecular speed of an ideal gas depends only on temperature. Since temperature doesn't change , the average molecular speed also remains the same .
0.05Hz
10s
2Hz
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Frequency (f) = Number of vibrations / Time f = 20 / 10 = 2 Hz Frequency is measured in Hertz (Hz) , where 1 Hz = 1 cycle per second .
جب بہتا ہوا پانی افقی پائپ پانی کے ______ کی مجبوری میں داخل ہوتا ہے؟
Speed decreases and pressure increases
Speed decreases and pressure decreases
Speed increases and pressure decreases
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
According to Bernoulli’s Principle , when fluid flows through a constriction, its velocity increases and pressure decreases .This happens because the total energy (kinetic + pressure) remains constant in an ideal fluid flow.
اگر کوئی شخص ______ اگر زمین پر زیادہ سے زیادہ دباؤ ڈال سکتا ہے تو؟
He stands with both feet flat on the ground
He lies down on the ground
He stands on the toes of one foot
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Pressure = Force / Area , so reducing the contact area increases pressure. Standing on the toes of one foot minimizes the area , thus exerting maximum pressure on the ground.
جسمانی مقدار "تسلسل" میں وہی جہت ہے جو ______ کی طرح ہے؟
Momentum
Force
Power
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Impulse is defined as Force × Time (F × t) , and its unit is Ns (Newton-second) . Momentum is Mass × Velocity (m × v) , which also has the unit Ns , meaning both have the same dimensions.
ایک شے سمندر میں مستقل رفتار پر عمودی طور پر اترتی ہے۔ آبجیکٹ پر کام کرنے والی تین قوتیں چپچپا ڈریگ اپرسٹ اور وزن ہیں۔ ان کی وسعت کے مابین کون سا تعلق درست ہے؟
Weight > upthrust
Weight < upthrust
Weight < drag
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
The object moves vertically downward at constant velocity , meaning forces are balanced. Weight is greater than upthrust because an additional force (viscous drag) also acts upward to balance the system.
