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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31. What happens when the stress applied to the body is increased beyond the maximum value and is removed after some time?

کیا ہوتا ہے جب جسم پر لگنے والا تناؤ زیادہ سے زیادہ قدر سے بڑھ جاتا ہے اور کچھ عرصے بعد اسے ہٹا دیا جاتا ہے؟

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Answer: The body cannot return to its original position

Explanation When the stress applied to the body is increased beyond the maximum value and then removed after some time, the body will " not be able to return to its original position ." This situation is known as plastic deformation , where the body undergoes permanent deformation.

32. In which Constitution of Pakistan, the Ministers were neither members of the parliament nor answerable to the Parliament?

پاکستان کے کس آئین میں ، وزراء نہ تو پارلیمنٹ کے ممبر تھے اور نہ ہی پارلیمنٹ کے جوابدہ تھے؟

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Answer: 1962 constitution

Explanation The 1962 Constitution of Pakistan introduced a presidential system , where ministers were appointed by the president and were not members of the parliament. They were directly accountable to the president , not the legislature. The Constitution of 1962 was promulgated by President Ayub Khan on 1 March 1962 and finally came into effect on 8 June 1962 .

33. A radioactive atom X emits an beta-particle. The resulting atom _____?

ایک تابکار ایٹم ایکس ایک بیٹا پارٹیکل خارج کرتا ہے۔ نتیجے میں ایٹم _____؟

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Answer: Has an atomic number that is one more than that of X

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 .

34. The primary producers of organic matter in nature are _____?

فطرت میں نامیاتی مادے کے بنیادی پروڈیوسر _____ ہیں؟

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Answer: Green plants

Explanation Green plants are primary producers because they convert sunlight into organic matter through photosynthesis . They form the base of the food chain . It producing oxygen and energy-rich compounds essential for life.

35. Which of the following organization was established in November 1945?

نومبر 1945 میں مندرجہ ذیل میں سے کون سی تنظیم قائم کی گئی تھی؟

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Answer: UNESCO

Explanation United Nations Educational Scientific and Cultural Organization (UNESCO) Founded 16 November 1945 Headquarters Paris, France Founded in London, UK Members 193

36. The scientist who correctly measured the velocity of light was _____?

سائنس دان جس نے روشنی کی رفتار کو صحیح طریقے سے ماپا تھا وہ _____ تھا؟

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Answer: Michelson

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.

37. The process in which pressure remains constant is called ______?

جس عمل میں دباؤ مستقل رہتا ہے اسے ______ کہا جاتا ہے؟

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Answer: Isobaric

Explanation “Iso-” means constant; “baric ” relates to pressure . In an isobaric process , pressure remains unchanged . Volume or temperature can change during the process. Examples: heating a gas in a piston-cylinder system a t constant atmospheric pressure. Isochoric = constant volume, isothermal = constant temperature, adiabatic = no heat transfer. Last updated question 25 feb 2026

38. A 20-F capacitor is charged to 200V. It's stored energy is _______?

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Answer: 40000 J

Explanation To find the stored energy, we can use the formula: Energy (E) = 0.5 × Capacitance (C) × Voltage² (V²) Given: C = 20 F V = 200 V E = 0.5 × 20 F × (200 V)² = 0.5 × 20 × 40,000 = 400,000 J

39. The Lifespan of Red Blood Cells (RBCs) ____ days.

خون کے سرخ خلیات کی عمر کتنے دن ہے؟

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Answer: 120

Explanation The lifespan of a red blood cell is around 120 days. Blood cells are made in the bone marrow. It produces about 95% of the body's blood cells. Additional information: The lifespan of white blood cells ranges from 13 to 20 days ,

40. The vacuum or free space, what observations are made?

ویکیوم یا خالی جگہ ، کون سے مشاہدات کیے جاتے ہیں؟

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Answer: p = 0, J = 0

Explanation In a vacuum or free space, there are no particles or matter, so: Pressure (p) is zero . Current density (J) is also zero , since there are no charged particles to carry current. Therefore, the correct observation is p = 0, J = 0.

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