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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321. Over-damping results in _____?

میں زیادہ سے زیادہ نمٹنے کے نتائج؟ _____

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Answer: Slower return to equilibrium

Explanation Over-damping occurs when damping is strong enough to prevent oscillations, causing the system to return to equilibrium slowly without oscillating . This is commonly observed in systems like heavy doors with hydraulic closers , which close slowly without bouncing.

322. When a substance was heated, its conductivity was increased, what should it be out of the following?

جب کسی مادے کو گرم کیا گیا تو ، اس کی چالکتا میں اضافہ کیا گیا تھا ، تو اسے مندرجہ ذیل میں سے کیا ہونا چاہئے؟

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Answer: Semi-conductors

Explanation In semiconductors , increasing temperature excites more electrons from the valence band to the conduction band, increasing conductivity. In contrast, metals have decreasing conductivity with temperature due to increased electron scattering.

323. The coefficient of transmission and coefficient of reflection for a given body at a given temperature are 0.33 and 0.64 respectively. Then the coefficient of emission of the same body at the same temperature will be ______?

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Answer: 0.03

Explanation According to Kirchhoff's law: Coefficient of emission (e) + Coefficient of reflection (r) + Coefficient of transmission (t) = 1 Given: t = 0.33, r = 0.64 e + 0.64 + 0.33 = 1 e = 1 - 0.97 = 0.03

324. Turbulent flow occurs when the Reynolds number is above ______?

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Answer: 5000

Explanation In a pipe flow, flow becomes turbulent at a Reynolds number greater than 4000 i.e. Re ≥ 4000. Fluid layers are not parallel to each other. Reynolds number (Re) determines the type of flow: Re < 2000 → Laminar flow 2000 < Re < 4000 → Transitional flow Re > 4000 - 5000 → Turbulent flow For most practical cases, turbulence begins around Re = 5000 .

325. The specific heat of lead is 0.030 cal/gC° 300g of lead shot at 100°C is mixed with 100 g of water at 70°C in an insulated container. The final temperature of the mixture is?

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Answer: 72.5°C

Explanation To find the final temperature, we can use the principle of heat transfer: Heat lost by lead = Heat gained by water Given: Specific heat of lead (c Pb) = 0.030 cal/g°C Mass of lead (m Pb) = 300 g Initial temperature of lead (T Pb) = 100°C Mass of water (m w) = 100 g Initial temperature of water (T w) = 70°C Specific heat of water (c w) = 1 cal/g°C (approximately) Let the final temperature be T f. Heat lost by lead = m Pb × c Pb × (T Pb - T f) = 300 × 0.030 × (100 - T f) Heat gained by water = m w × c w × (T f - T w) = 100 × 1 × (T f - 70) Equating the two expressions: 300 × 0.030 × (100 - T f) = 100 × 1 × (T f - 70) Simplifying the equation: 9(100 - T f) = 100T f - 7000 900 - 9T f = 100T f - 7000 109T f = 7900 T f ≈ 72.5°C

326. The Black Forest is located in which country?

بلیک فاریسٹ کس ملک میں واقع ہے؟

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Answer: Germany

Explanation The Black Forest (Schwarzwald) is a mountainous region in southwestern Germany . This is known for its dense forests and scenic beauty. It is famous for cuckoo clocks, spa towns , and being the inspiration for many fairy tales.

327. For growth, Viruses require _____?

ترقی کے لئے، وائرس کو _____ کی ضرورت ہے؟

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Answer: Living host

Explanation Viruses are obligate intracellular parasites , This meaning they cannot grow or reproduce outside a living host cell . They lack cellular machinery for metabolism . It rely entirely on the host's cells to replicate.

328. A particle executing simple harmonic motion of amplitude 5 cm has maximum speed of 31.4 cm/s. The frequency of its oscillation is ______?

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Answer: 1 Hz

Explanation To find the frequency, we can use the equation: v_max = A * ω where v_max = 31.4 cm/s, A = 5 cm ω = v_max / A = 31.4 cm/s / 5 cm = 6.28 rad/s Now, ω = 2 * π * f f = ω / (2 * π) = 6.28 rad/s / (2 * π) = 1 Hz

329. The Antonym of Ingenious is?

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Answer: Devious

Explanation Ingenious means ذہین Devious means شیطان

330. Canonical transformations can often be conveniently found or verified by using a ______?

کا استعمال کرکے کیننیکل تبدیلیاں اکثر آسانی سے پائی جاسکتی ہیں یا اس کی تصدیق کی جاسکتی ہیں؟ _____

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Answer: Generating function

Explanation Canonical transformations in classical mechanics are often determined using generating functions, which help in transforming coordinates while preserving Hamiltonian structure. These functions ensure that the new and old variables satisfy Hamilton’s equations , maintaining the system’s fundamental properties.

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