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۔
کھوکھلی کروی کنڈکٹر کے اندر فیلڈ ______ ہے؟
- Function of distance from the center
- Constantly zero
- Constant but not necessarily zero
- None of these
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Explanation
According to Gauss's Law, the electric field inside a hollow spherical conductor is zero because any excess charge resides on the outer surface.This happens because the conducting material redistributes charge to cancel out internal electric fields.
زمین اور سمندری ہوا کا رجحان _____ کا نتیجہ ہے؟
- Entropy
- Conduction
- Convection
- None of these
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Explanation
Land and sea breezes occur due to convection currents, where warm air rises and cool air moves in to replace it.During the day, land heats up faster than water, causing air above it to rise and cooler sea air to move in, creating a sea breeze.At night, the process reverses, forming a land breeze.
سائنس دان جس نے روشنی کی رفتار کو صحیح طریقے سے ماپا تھا وہ _____ تھا؟
- Michelson
- Maxwell
- Galileo
- None of these
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Explanation
Albert A. Michelson accurately measured the speed of light in 1879 using a rotating mirror experiment.He later refined his measurements in the Michelson-Morley experiment.He confirming that light travels at approximately 299,792 km/s in a vacuum.
ایک سادہ خوردبین کی صورت میں حاصل کردہ تصویر ______؟
- Virtual and inverted
- Real and erect
- Virtual and erect
- None of these
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Explanation
A simple microscope (convex lens) forms a virtual and erect image when the object is placed within the focal length.The image appears magnified and on the same side as the object.
میڈیم جس میں روشنی کی رفتار مستقل رہتی ہے؟
- Plane medium
- Homogeneous
- Heterogeneous
- None of these
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Explanation
The velocity of light remains constant in a homogeneous medium, where the material properties (such as refractive index) are uniform throughout.In a heterogeneous medium, variations in composition cause light to change speed and direction.
میں آواز کی رفتار سب سے بڑی ہے؟ ______
- Steel
- Water
- Air
- None of these
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Explanation
The velocity of sound is highest in solids, followed by liquids and then gases. Because sound travels faster in denser and more elastic materials.Steel, being a solid with high elasticity.It allows sound to travel faster compared to water, air, or glass.
مندرجہ ذیل میں سے کس جگہ پر ایک سادہ لاکٹ کی حرکت تیز ہوتی جاتی ہے؟
- Karachi
- Muree
- Lahore
- None of these
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Explanation
The motion of a simple pendulum depends on gravitational acceleration (g), which increases with higher altitude.Murree is at a higher elevation, so g is slightly higher, making the pendulum move faster.
گھومنے والی حرکت میں ، طاقت کا ینالاگ ______ ہے؟
- Speed
- Torque
- Momentum
- None of these
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Explanation
In rotational motion, torque is the rotational analog of force in linear motion.Just as force causes linear acceleration (Newton's Second Law: F = ma).Torque causes angular acceleration (τ = Iα), where τ is torque, I is the moment of inertia, and α is angular acceleration.
ستاروں کے رنگ ان کے _____ کی وجہ سے ہیں؟
- Temperature
- Size
- Distance
- Composition
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Explanation
- The color of a star is primarily determined by its surface temperature.
- Stars come in a range of colors, including red, orange, yellow, white, and blue, which are indicative of their surface temperatures.
- The hotter the star, the bluer it appears, while the cooler the star, the redder it appears.
کس قسم کے برقی مقناطیسی تابکاری میں سب سے کم طول موج اور اعلی ترین توانائی ہے؟
- Ultraviolet rays
- Gamma rays
- X-rays
- None of these
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Explanation
- Gamma rays have the shortest wavelength in the electromagnetic spectrum.
- Wavelength: Shorter than 0.01 nanometers (smaller than an atom's nucleus)
- Energy & Frequency: Highest frequency and highest photon energy of any wave type.
- Origin: Created by radioactive atomic nuclei decay
- They are used in medical treatments and scientific research.
