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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Answer: 4
Explanation The energy required to excite an electron from the second orbit to the third orbit is: ΔE = 13.6Z^2(1/4 - 1/9) eV Given ΔE = 42.7 eV: 42.7 = 13.6Z^2(1/4 - 1/9) Solving for Z: Z = 4
Answer: 40 W
Explanation When four equal resistors are connected in series, the total resistance (R_total) is: R_total = 4R The power dissipated (P) is: P = V² / R_total Given P = 10 W, we can rewrite the equation as: 10 = V² / (4R) Now, if one resistor is connected across the same battery, the power dissipated (P') will be: P' = V² / R Comparing the two equations, we can see that: P' = 4P = 4 × 10 W = 40 W
کسی بھی لہر کے کرسٹ سے کرسٹ تک کا فاصلہ ______ کہا جاتا ہے؟
Answer: Wavelength
Explanation The wavelength is the distance between two consecutive crests or troughs in a wave. It is typically measured in meters (m) . It is represented by the symbol λ (lambda) .
Answer: Wasteful
Explanation Prodigal means فضول خرچ Recklessly Wasteful means فضول خرچ Profligate means منافع
Answer: 2h
Explanation When a man throws a ball to the maximum height (h), the initial velocity (v₀) is entirely vertical. The maximum height (h) is given by: h = v₀² / (2g) where g is the acceleration due to gravity. Now, when the man throws the same ball to the maximum horizontal distance, the initial velocity (v₀) is entirely horizontal. The maximum horizontal distance (R) is given by: R = v₀² / g Substituting the expression for v₀² from the first equation: R = 2h
Answer: 8%
Explanation Uncertainty propagation in multiplication/division follows the rule: Δ P P = 2 × Δ V V + Δ R R Given uncertainty in V = e% and uncertainty in R = 2% , Total uncertainty = 2 ( e ) + 2 = 8 % text{Total uncertainty} = 2(e) + 2 = 8% (assuming e = 3%)
مندرجہ ذیل میں سے کون سا پروجیکشن زاویے کا نتیجہ سب سے بڑی حد میں ہوگا؟
Answer: 45°
Explanation The maximum range in projectile motion occurs at a launch angle of 45° , assuming no air resistance. At this angle, the horizontal and vertical components of velocity are optimally balanced , leading to the greatest distance covered.
انٹراپی میں اضافہ کا مطلب ہے میں اضافہ؟
Answer: Randomness
Explanation Increase in entropy generally means an increase in " randomness ."
پاکستان کے 1973 کے آئین میں کل ترامیم ہوئے ہیں؟
Answer: 27
Explanation The 1973 Constitution of Pakistan has undergone 27 amendments, with the 26th Amendment enacted in late 2024. The first 10 amendments are known as the Bill of Rights.
مواد کی ریفریجویٹ انڈیکس تقریبا _____ کے مربع جڑ کے برابر ہے؟
Answer: Electrical permittivity × Magnetic permeability
Explanation The refractive index (n) of a material is given by: n = μ ε n = sqrt{mu varepsilon} where μ is the magnetic permeability and ε is the electrical permittivity of the material. This relation shows how light propagation depends on both electric and magnetic properties of the medium.
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