All MCQs - Lecturer Physics Past Papers and Syllabus Practice | PakExamPoint

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All MCQs and revision practice

Study All through multiple-choice questions in Lecturer Physics Past Papers and Syllabus. This subtopic contains 342 practice questions. Read the wording carefully, compare the options and attempt an answer before checking the solution in learning mode.

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11. Which of the following concepts introduced by Einstein laid the foundation for modern quantum mechanics?

آئن اسٹائن کے ذریعہ متعارف کروائے جانے والے مندرجہ ذیل میں سے کون سے تصورات نے جدید کوانٹم میکانکس کی بنیاد رکھی؟

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Answer: Photoelectric effect

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.

12. If the plates of a charged parallel plate capacitors are pulled away from each other ______?

اگر چارج شدہ متوازی پلیٹ کیپسیٹرز کی پلیٹیں ایک دوسرے سے دور ہوجاتی ہیں ______؟

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Answer: Voltage decreases

Explanation The capacitance of a parallel plate capacitor is given by C = ε₀A/d , where d is the distance between the plates. If d increases, C decreases. The voltage across a capacitor is V = Q/C . Since Q remains constant and C decreases, V increases.

13. A Carnot engine, with its cold body at 17°C, has 50% efficiency. If the temperature of its hot body is now increased by 145°C, the efficiency becomes _____?

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Answer: 60%

Explanation Given: Initial efficiency (η₁) = 50% = 0.5 Initial cold body temperature (T₁) = 17°C = 290 K Initial hot body temperature (T₂) = unknown We know that the efficiency of a Carnot engine is: η = 1 - (T₁ / T₂) 0.5 = 1 - (290 K / T₂) T₂ = 580 K Now, the hot body temperature is increased by 145°C: New hot body temperature (T₂') = 580 K + 145°C = 725 K New efficiency (η₂) is: η₂ = 1 - (T₁ / T₂') = 1 - (290 K / 725 K) ≈ 0.6 New efficiency (η₂) is approximately 60%.

14. Katpana desert is located in ____?

کَٹپانا ریگستان کہاں واقع ہے؟

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Answer: Skardu

Explanation Katpana Desert is a cold desert located in Skardu, Gilgit-Baltistan , Pakistan. Popular for photography, jeep safaris, and desert snow landscapes . Additional information : Altitude: 2,226 meters above sea level Global ranking: 16th largest desert in the world Approximate area: ~ 50 km² Average winter temperature: -10°C to 5°C Last verified on 12-03-2026

15. Compton effect is associated with ______?

کامپٹن اثر ______ کے ساتھ وابستہ ہے؟

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Answer: X-Rays

Explanation The Compton Effect describes the scattering of X-rays when they collide with electrons, causing a change in wavelength. This effect provided key evidence for the particle nature of light (photon theory). It is significant in quantum mechanics .

16. The train went_____the tunnel.

ٹرین چلی ___ سرنگ۔

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Answer: Through

Explanation The train went " through " the tunnel. ٹرین سرنگ میں سے گزری۔ " Through " is used to indicate movement from one side to the other inside a space, like a tunnel.

17. A line drive to the short stop is caught at the same height as it was it was originally hit. Over it's entire flight the work done by gravity and the work done by air resistance, respectively are _____?

مختصر اسٹاپ پر ایک لائن ڈرائیو اسی اونچائی پر پکڑی گئی تھی جیسا کہ یہ اصل میں مارا گیا تھا۔ اس کی پوری پرواز کے دوران کشش ثقل کے ذریعہ کیا گیا ہے اور ہوا کے خلاف مزاحمت کے ذریعہ بالترتیب کام کیا گیا ہے _____؟

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Answer: Zero; negative

Explanation The work done by gravity is zero because gravity is a conservative force, and the ball returns to the same height where it started. The work done by air resistance is negative because it always opposes the motion, reducing the ball’s kinetic energy.

18. A stone thrown from the top of a tall building follows a path that is ______?

لمبی عمارت کے اوپری حصے سے پھینک دیا جانے والا ایک پتھر اس راستے پر چلتا ہے جو ______ ہے؟

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Answer: Parabolic

Explanation A projectile follows a parabolic path under the influence of gravity and initial velocity. The motion combines horizontal uniform velocity and vertical acceleration due to gravity.

19. The Antonym of Feisty is?

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Answer: Spiritless

Explanation Feisty means جوش ميں آيا ہُوا Spiritless means بے روح

20. Optical fiber operates on the principle of ______?

آپٹیکل فائبر ______ کے اصول پر کام کرتا ہے؟

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Answer: Total internal reflectance

Explanation Optical fibers transmit data as light signals. The signal is confined within the fiber due to the phenomenon where light hits a medium boundary. It is completely reflected back.

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