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A. √l(l + 1) h/2π
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B. √l(l + 3) h/2π
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C. None of these
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D. √l(l + 2) h/2π
Explanation
- In Schrödinger wave mechanics, angular momentum is quantized as L = √l(l + 1) h/2π, where l is the azimuthal quantum number.
- This differs from Bohr's model, which assumes L = nh/2π without considering quantum wave behavior.
متحدہ پاکستان کے آخری دن کس نے لکھا تھا؟
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A. G.W. Chaudhary
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B. I.H. Qureshi
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C. Herbert Feklman
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D. None of these
Explanation
- "The Last Days of United Pakistan" was written by G.W. Chaudhary.
- The book discusses the political and historical events leading to the separation of East Pakistan in 1971.
ہم زیادہ تر اشیاء دیکھ سکتے ہیں کیونکہ وہ _______؟
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A. Refract light
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B. Reflect light
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C. None of these
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D. Emit light
Explanation
- Most objects are visible because they reflect light into our eyes.
- Only luminous objects emit light, while others rely on reflection.
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A. 6000 years
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B. None of these
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C. 9000 years
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D. 12000 years
Explanation
If the radioactivity is half of that in fresh wood, the time elapsed is equal to one half-life of C-14, which is 6000 years.
Therefore, the tomb is approximately 6000 years old.
نگرانی کا ایک اہم مقصد اساتذہ اور _____ کے وژن کو بڑھانا ہے؟
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A. Improvement
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B. None of these
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C. Freedom
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D. Performance
Explanation
- Supervision in education is designed to enhance teaching practices by providing constructive feedback and support.
- It aims to broaden the teacher's perspective and foster continuous improvement in classroom performance.
لوہے کا ایک ایٹم ______ بار ہے جس میں ہائیڈروجن کے ایٹم کی طرح بھاری ہے۔
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A. 1638
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B. None of these
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C. 238
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D. 55
Explanation
- The atomic mass of iron (Fe) is approximately 55, while the atomic mass of hydrogen (H) is about 1.
- Therefore, an iron atom is roughly 55 times heavier than a hydrogen atom.
-
A. 5
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B. 10
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C. 8
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D. None of these
Explanation
- pH is calculated as pH = -log[H⁺].
- Given [H⁺] = 1 × 10⁻⁸, so pH = 8.
-
A. 3
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B. None of these
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C. 5
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D. 0
Explanation
- In elemental form (N₂), nitrogen is in its natural, uncombined state.
- The oxidation number of any element in its pure form is always 0.
آکسائم _____ کے نام سے بھی جانا جاتا ہے؟
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A. None of these
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B. Formaldehyde amine
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C. Cyanohydrin
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D. Acetaldehyde amine
Explanation
- Oximes are chemical compounds derived from aldehydes or ketones by reaction with hydroxylamine.
- They are also referred to as Formaldehyde amine due to their structural similarity.
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A. AB + BC = A(B + C)
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B. A + (BC) = (A + B)(A + C)
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C. A(B + C) = AB + AC
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D. None of these
Explanation
- The distributive law in Boolean algebra states that multiplication distributes over addition: A(B + C) = AB + AC.
- It ensures logical expressions can be simplified systematically while maintaining equivalence.
