All MCQs - Lecturer Physics Past Papers and Syllabus Practice | PakExamPoint
Practise All MCQs in Lecturer Physics Past Papers and Syllabus. Attempt multiple-choice questions, check answers and revise related subtopics.
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.
Use these All MCQs to identify the facts, rules or methods you need to revise. Where an explanation is available, work through it and write down why your chosen option was correct or incorrect. Revisit difficult questions after reviewing your notes, then use exam mode for timed practice.
Explanation Nuclear fusion releases more energy than fission because lighter nuclei (e.g., hydrogen) fuse to form a heavier nucleus (e.g., helium) , releasing a large amount of energy. The energy per nucleon in fusion is higher than fission , as seen in stars like the Sun, where hydrogen fusion powers immense energy output .
Explanation The rule for addition of significant figures states that the result should have the same number of decimal places as the number with the fewest decimal places. Given numbers : 72.1 (1 decimal place) 3.32 (2 decimal places) 0.003 (3 decimal places) Sum: 72.1 + 3.32 + 0.003 = 75.423 Rounding to one decimal place (as in 72.1), the final answer is 75.4 .
Explanation Magnetization (M) is the product of the magnetic field intensity (H) and the magnetic susceptibility (χ): M = χH Given: χ = 3.7 × 10^-3 H = 10^4 A/m M = (3.7 × 10^-3) × (10^4 A/m) = 37 A/m
جب جسم پر لگائے جانے والے تناؤ کو زیادہ سے زیادہ قیمت سے زیادہ بڑھایا جاتا ہے اور کچھ وقت کے بعد اسے ہٹا دیا جاتا ہے تو کیا ہوتا ہے؟ ینگ کے ماڈیولس کی تعریف ______ کے طور پر کی گئی ہے؟
A. Tensile stress/tensile strain
B. Tensile strain × tensile stress
C. Tensile strain/tensile stress
D. None of these
Check answer and explanation
Answer: Tensile stress/tensile strain
Explanation Young's modulus is a measure of the stiffness of a material, defined as the ratio of tensile stress to tensile strain within the elastic limit. It quantifies how much a material will stretch or compress under a given force.
جب بہتا ہوا پانی افقی پائپ پانی کے ______ کی مجبوری میں داخل ہوتا ہے؟
A. Speed decreases and pressure increases
B. Speed increases and pressure decreases
C. Speed decreases and pressure decreases
D. None of these
Check answer and explanation
Answer: Speed increases and pressure decreases
Explanation According to Bernoulli’s Principle , when fluid flows through a constriction, its velocity increases and pressure decreases . This happens because the total energy (kinetic + pressure) remains constant in an ideal fluid flow.
انسانی جسم میں سب سے زیادہ وافر معدنیات کون سی ہے؟
A. Potassium
B. Magnesium
C. None of the above
D. Calcium
E. Sodium
Check answer and explanation
Answer: Calcium
Explanation Calcium is the most abundant mineral in the human body, calcium makes up 1.5 to 2% of the total body weight. Approximately 1,200 g of calcium is present in the body of an adult human more than 99% of that amount is found in bones. *** ND11-12-2022
حرکت پذیر جسم سے وابستہ ڈی بروگلی لہر گروپ _____ رفتار کے ساتھ سفر کرتا ہے؟
A. One fourth of the velocity with which the body is moving
B. With which body is moving
C. Half of the De Broglie wave groups velocity
D. None of these
Check answer and explanation
Answer: With which body is moving
Explanation The velocity of the De Broglie wave group (group velocity) is equal to the velocity of the particle or body in motion . This is because the De Broglie wave group represents the particle's motion.
B. Can be constructed from two similar waves travelling in opposite directions
C. Has motionless points that are closer than half a wavelength
D. None of these
Check answer and explanation
Answer: Can be constructed from two similar waves travelling in opposite directions
Explanation A standing wave is formed by the interference of two waves with the same frequency and amplitude moving in opposite directions. This results in nodes (motionless points) and antinodes (points of maximum displacement) at fixed positions.
ایک مساوی پرزم اور ہوا کا 45 ڈگری کا نازک زاویہ ہوتا ہے۔ اگر آنے والی شعاع ریفریکٹنگ سطح پر کھڑی ہے تو یہ _____؟
A. It is reflected from the second surface and emerges perpendicular from the third surface
B. None of these
C. It gets reflected from second and third surfaces and emerges from the first surface
D. It keeps reflecting from all the three sides of the prism and never emerges out
Check answer and explanation
Answer: It is reflected from the second surface and emerges perpendicular from the third surface
Explanation Total Internal Reflection (TIR) : Since the critical angle is 45° , and the incident ray is perpendicular to the first surface , it enters without deviation and strikes the second surface at 60° (greater than 45°), causing TIR . Emergence : After reflecting from the second surface, the ray reaches the third surface at 30° , which is less than the critical angle , so it emerges perpendicularly from the third surface .
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