Practise All MCQs in Lecturer Physics Past Papers and Syllabus. Attempt multiple-choice questions, check answers and revise related subtopics.
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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ایک نوڈ اور اینٹینوڈ کے درمیان مرحلے کا فرق _____ ہے؟
Answer: 90°
Explanation In a standing wave , the phase difference between a node (zero displacement) and an antinode (maximum displacement) is 90° (π/2 radians) . This means that when the antinode reaches maximum displacement, the node remains at rest.
بریگ کی مساوات _____ کا نتیجہ ہے؟
Answer: Laue equations
Explanation Bragg's equation (nλ = 2d sinθ) is derived from Laue equations . It describe the diffraction of X-rays by crystal lattices. Max von Laue formulated these equations, which later led to Bragg's Law , explaining X-ray diffraction patterns.
عوامی صحت کی دیکھ بھال کا معیار_____ اس کے لیے مختص رقم پر۔
Answer: Depends
Explanation The quality of public healthcare " depends " on the amount of money allocated to it.
جب آواز ایک میڈیم سے دوسرے میڈیم میں داخل ہوتی ہے تو کیا تبدیل نہیں ہوتا؟
Answer: Frequency
Explanation When sound travels from one medium to another, speed and wavelength change due to the change in the medium's properties. Frequency remains constant because it is determined by the source of the sound, not the medium.
اگر آپ نے قواعد کی پیروی کی تھی، تو آپ کو _____ نااہل قرار دے دیا گیا۔
Answer: Would not have been
Explanation "If you had followed the rules, you would not have been disqualified ."
سیمیکمڈکٹر میں چارج کیریئر کی نقل و حرکت کا انحصار _____ کے ذریعہ دیا گیا ہے؟
Answer: μ ∝ 1/T¹/²
Explanation The mobility (μ) of charge carriers in a semiconductor is inversely proportional to the square root of temperature (T) due to increased lattice scattering at higher temperatures. This relation is expressed as μ ∝ 1/T¹/² , meaning mobility decreases as temperature increases.
ایس ٹی ایم کی مکمل شکل _____ ہے؟
Answer: Scanning Tunneling Microscope
Explanation Scanning Tunneling Microscope (STM) is a powerful tool used to image surfaces at the atomic level using quantum tunneling . It was invented by Gerd Binnig and Heinrich Rohrer in 1981 . It is widely used in nanotechnology .
ایچ اسپیکٹرم کی مندرجہ ذیل سیریز میں سے کون سی بالائے بنفشی خطے میں واقع ہے؟
Answer: Lyman series
Explanation - Lyman Series: Electron transitions from higher energy levels (n ≥ 2) to n = 1. - Since these transitions release high-energy photons, they fall in the ultraviolet range of the electromagnetic spectrum. - Example transitions: - n = 2 → 1 - n = 3 → 1 - etc.
Answer: 135
Explanation To find the work done, we need to integrate the force with respect to the displacement. Given: F(x) = 7 - 2x + 3x^2 N x_initial = 0 m x_final = 5 m Work done (W) is the integral of force (F) with respect to displacement (x): W = ∫[x_initial, x_final] F(x) dx = ∫[0, 5] (7 - 2x + 3x^2) dx Evaluating the integral: W = [7x - x^2 + x^3] from 0 to 5 = (7(5) - 5^2 + 5^3) - (7(0) - 0^2 + 0^3) = (35 - 25 + 125) - 0 = 135 J
متعلقہ میکانکس جسمانی طور پر کلاسیکی میکانکس سے مختلف نتائج پیدا کرتا ہے؟
Answer: Very high velocities
Explanation Relativistic mechanics differs from classical mechanics when objects move at speeds close to the speed of light ( v ≈ c v approx c ). At low velocities , classical mechanics gives accurate results, but at very high velocities , effects like time dilation and mass increase become significant.
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