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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261. When object is thrown upward it rises to height "h" how high is the object in terms of h, when it has lost one third of its original Kinetic Energy?

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Answer: h/2

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 .

262. Ulaanbaatar is the capital of which country?

اولانبتار کس ملک کا دارالحکومت ہے؟

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Answer: Mongolia

Explanation Mongolia Capital is Ulaanbaatar . Mongolia Currency is Togrog . Mongolia official language is Mongolian . Mongolia located is in Continent Asia . Mongolia Primary Religion is Buddhism . Mongolia Head of Govt. is Prime Minister – Luvsannamsrain Oyun-Erdene . Mongolia Parliament called Great People’s Khural . agm.5.3.23

263. If a satellite is orbiting as close to the earth's surface as possible ______?

اگر کوئی مصنوعی سیارہ زمین کی سطح کے قریب سے گردش کر رہا ہے تو ______؟

Check answer and explanation

Answer: Its kinetic energy will be maximum

Explanation When a satellite orbits close to the Earth's surface, it must travel faster to avoid falling towards the Earth due to gravity. This means its speed is maximum. Since kinetic energy (KE) is proportional to the square of the speed (v), the kinetic energy will also be maximum: KE = (1/2)mv^2 where m is the mass of the satellite. So, when a satellite orbits close to the Earth's surface, its kinetic energy will be maximum.

264. One projectile moving with velocity V in space gets burst into 2 parts of masses in the ratio 1:3. The smaller part becomes stationary. What is the velocity of the other part?

Check answer and explanation

Answer: 4V/3

Explanation Since the smaller part becomes stationary, it means that the larger part will carry all the momentum. Let's say the mass of the smaller part is m and the mass of the larger part is 3m. Initial momentum = Final momentum mV + 3mV = 3mV' where V' is the velocity of the larger part. Combine like terms: 4mV = 3mV' Divide both sides by 3m: V' = 4V/3

265. The phenomenon of land and sea breeze is a result of _____?

زمین اور سمندری ہوا کا رجحان _____ کا نتیجہ ہے؟

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Answer: Convection

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 .

266. Magnetic field used in a moving coil galvanometer is _____?

مقناطیسی فیلڈ چلتی کنڈلی گالوانومیٹر میں استعمال _____ ہوتا ہے؟

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Answer: Radial

Explanation A moving coil galvanometer uses a radial magnetic field to ensure that the coil experiences torque in a uniform manner, regardless of its position. This field is achieved using a curved permanent magnet. This allowing the plane of the coil to always be perpendicular to the magnetic field.

267. Quantum Numbers are solution of _____?

کوانٹم نمبر _____ کے حل ہیں؟

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Answer: Schrodinger's Wave Equation

Explanation Quantum numbers arise as solutions to Schrödinger's wave equation . It describes the behavior of electrons in an atom. These numbers define electron properties like energy levels (n), shape (l), orientation (mₗ), and spin (mₛ).

268. A disc of mass 2 kg and diameter 2m is performing rotational motion. Find the work done, if the disc is rotating from 300 rpm to 600 rpm?

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Answer: 1479 J

Explanation The correct answer is approximately 1479 J.

269. A cubical block rests on an incline plane of μ = 1/√3. Determine the angle of inclination when the block just slides down the inclined plane?

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Answer: 30°

Explanation Since μ = 1/√3, we can use the fact that μ = tan(θ) when the block just slides down the inclined plane. μ = 1/√3 = tan(θ) θ = arctan(1/√3) θ = 30°

270. If momentum decreases by 20% kinetic energy will decrease _____?

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Answer: 36%

Explanation Momentum (p) is proportional to velocity (v), while kinetic energy (KE) is proportional to v². When momentum decreases by 20% , velocity decreases by 20% . So, kinetic energy decreases by (1 - 0.8²) × 100% ≈ 36%.

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