The Epstein Files Unsealed: Everything You Need to Know About Jeffrey Epstein’s Documents, the 2026 Releases, Key Names, and What They Actually Reveal

  The Epstein Files Explained: What They Are, Why They Matter, and What We Know So Far The phrase “Epstein files” has become one of the most searched and discussed topics in recent years. It appears frequently in news headlines, social media debates, and online discussions about power, justice, and accountability. Yet many people are unclear about what the Epstein files actually are, what they contain, and why they continue to attract global attention years after Jeffrey Epstein’s death. This article provides a clear, balanced, and detailed explanation of the Epstein files, their background, the legal and political impact, and the ongoing public interest surrounding them. The goal is to separate confirmed facts from speculation while helping readers understand why this case remains significant. Who Was Jeffrey Epstein? Jeffrey Epstein was an American financier who became widely known not for his business career but for criminal allegations involving the sexual exploitation of under...
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Jiwaji university previous year solved question papers BA/B.COM/BSC Physics






EXAMINATION,  Exam - B.Sc. 


SUBJECT - PHYSICS

Paper-I

SOLID STATE PHYSICS DEVICE

Time : Three Hours

Maximum Marks : 85 (For Regular Students)
Minimum Pass Marks : 29
Maximum Marks : 100 (For Private Students)
Minimum Pass Marks : 34

नोट- सभी प्रश्न हल करने हैं। प्रश्न क्रमांक 1 अनिवार्य है।
Attempt all questions. Question
no. 1 is compulsory.

1. कोई पाँच प्रश्न हल कीजिए-
5x5=25/6X5=30
Attempt any five questions-

(a) सात क्रिस्टल समुदायों के नाम लिखिए।
Write name of seven crystal system.

(b) मिलर निर्देशांकाँ से आप क्या समझते हैं।
What do you mean by Miller Indices?

(C) हाल प्रभाब क्या है ?
What is Hall effect?

(d) शैथिल्य हानि का वक्र खींचिए।
Draw curve for hysteresis losses.

(e) अर्धचालक में अनुगमन वेग समझाइए।
Explain drift-velocity sermiconductors.

(f).एक ध्रुवी ट्रॉजिस्टर व द्विध्रुवी ट्रॉजिस्टर में अन्तर बताइए।
Differentiate mono and bipolar transistors. .

(g) परिपथ में Qबिन्दु एवं बायसिंग विभव क्या है?
What are Q-point and baising voltage in circuit ?

(h) माडुलन एवं संसूचन उदाहरण सहित समझाइए।
Explain modulation and detection with suitable example.

(i) नैनौ क्रिस्टल के उपयोग बताइए।
Write uses of nano crystals.

(j) नैनो क्रिस्टल साधारण क्रिस्टल से क्यों भिन्न हैं ?
Differentiate nano crystal and simple crystal.

2. यूनिट सेल किसे कहते हैं ? घनाकार लेटिस का उदाहरण लेकर सरल घनीय, फलक केन्द्रित, अन्त:केन्द्रित घनीय यूनिट सेल को चित्र द्वारा दर्शाइए।
What is unit cell ? Draw simple cubic, face centered, body centred cubic lattice diagram with special reference to simple cubic lattice.

अथवा
(Or)

किसी आयनिक क्रिस्टल की ससंजक ऊर्जा में किन-किन ऊर्जाओं का समावेश है ? व्यंजक व्युत्पन्न
कीजिए।
Explain in detail energy factors in cohesive energy of ionic crystal. Derive expression for it.

3.डिबाई के क्वाण्टम सिद्धान्त की सहायता से किसी ठोस की विशिष्ट ऊष्मा के लिए व्यंजक स्थापित
कीजिए।
Derive expression for specific heat of solid by Debye theory of quantum mechanics.

अथवा
(Or)

निम्न पर टिप्पणियाँ लिखिए-
(i) फोनोन की अवधारणा
(ii) ध्वनिकी तथा प्रकाशिकी विधाएँ
(iii) ब्रिलुवाँ जोन।
Write short notes on-
(1) Concept of phonon
(ii) Acoustic and optical modes
(iii) Brillouin zones.

4. ट्रांजिस्टर की PNP व NPN विधा में सम्भावित मूल परिपथ खींचिए तथा प्रत्येक विधा के गुण
लिखिए।
Draw circuits for possible modes of NPN and PNP transistor. Write down properties of each mode of
transistors. 

अथवा
(Or)

(a) पी. एन. संधि में सन्धि स्थल पर अवक्षय पर्त की चौड़ाई के लिए व्यंजक व्युत्पन्न कीजिए।
Derive expression for depletion layer at junction for p-n junction diode.

(b) एक जीनर डायोड का भंजन विभव 6 वोल्ट है। परिपथ से अधिकतम धारा 20 मिली एम्पियर बह सकती है। यदि लोड प्रतिरोध 1.0KO हो तो लोड धारा व जीनर धारा की गणना कीजिए।
Breakdown voltage of zener diode is 06 volts. 20 mA current can flow through circuit. If load resistance 1S 1.OK2 then determine load current and zener current.

5.

(a) ट्रांजिस्टर के 7 पैरामीटर से क्या अभिप्राय है? उभयनिष्ठ आधार विधा में व्यंजक व्युत्पन्न कीजिए।
What are h parameters of a transistor? Derive expression for common emitter mode of a transistor of it.

(b) What do you mean by distortion and noise in amplifiers?

or

(A) Explain working of R-C coupled amplifier. Draw frequency response curve.

(b)Determine length of antenna to transmit signals of 10 MHz radio signals.

6.

(a) अवस्थाओं के घनत्व से क्या तात्पर्य है? ID.2D तथा 3D संरचना में ऊर्जा के साथ चनत्व किस प्रकार बदलता है? समझाइए।
What do you mean by density of states ? In nano materials density changes with energy in 1D, 2D and 3D structures. Explain.

(b) नैनो मुद्रण से क्या तात्पर्य है?
What is nano Lithography?

(Or)

(D) नैनो टेक्नोलॉजी के अनुप्रयोग पर निबंध लिखिए।
Write detailed note on application of nanotechnology.

(b) प्राकृतिक रूप में पाए जाने वाले दो नैनो क्रिस्टलों के नाम लिखिए।
Write name of two natural nano crystals.

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