Physics Paper-I – Bihar Forests Conservator Exam (75 marks)
- Conducted By BPSC
- Questions 4
- Maximum Marks 75
Exam Details
| Detail | Information |
|---|---|
| Examination | Physics Paper-I |
| Conducting Body | BPSC |
| Paper | Physics Paper-I |
| Subject | Physics |
| Maximum Marks | 75 |
| Number of Questions | 4 |
This dataset represents Physics Paper-I for the Assistant Conservator of Forests Competitive Examination in Bihar. The paper is bilingual (Hindi and English) and has a total of 75 marks. Page 1 provides exam instructions and context, while Page 2 repairs and lists four descriptive questions. The questions cover a rocket motion problem (Tsiolkovsky-like), invariance of the spacetime interval in Minkowski space, step-index multimode fiber parameters (core/cladding refractive indices, numerical aperture, and acceptance angle), and a diffraction/grating problem involving a plane transmission grating with 5000 lines per cm and a wavelength of 6000 Å.
Major Topics Covered
- Rocket motion
- Conservation in rocket dynamics
- Special relativity
- Minkowski space
- Invariant interval
- Fiber optics
- Step-index multimode fiber
- Refractive index (core/cladding)
- Numerical aperture
- Maximum acceptance angle
- Diffraction gratings
- Plane transmission grating
- Optical wavelengths
- Angstrom (Å) spectroscopy
- Photon optics
- Inertial frames
- Relativistic invariants
- Optical communication
- Linear optics
- Question paper formatting
Why This Paper is Important
- Useful for Assistant Conservator of Forests Competi preparation
- Helps understand the latest exam pattern
- Useful for practice and self-assessment
- Covers frequently asked General Studies topics
- Helpful for analysing question trends
Related Resources
Instructions
- पूर्णांक : 75 Instructions: • Symbols carry their usual meanings. All questions carry equal marks. Answer any five questions. Candidates are required to give their answers in their own words as far as practicable. • All questions have been printed both in Hindi and English. In case of any ambiguity in Hindi version, the English version shall be considered authentic. • Parts of the same question must be answered together and must not be interposed between answers to other questions. अनुदेश: • संकेतों का अपना सामान्य अर्थ है।
- सभी प्रश्नों के अंक बराबर हैं।
- किन्हीं पाँच प्रश्नों के उत्तर दें। • परीक्षार्थी यथासम्भव अपने शब्दों में ही उत्तर दें। • सभी प्रश्न हिन्दी और अंग्रेजी दोनों भाषा में छपे हैं।
- यदि हिन्दी भाषा में कोई संदेह है, तो अंग्रेजी भाषा को ही प्रामाणिक माना जाएगा। • एक ही प्रश्न के विभिन्न खण्डों के उत्तर अनिवार्य रूप से एक-साथ ही लिखे जाएँ तथा उनके बीच में अन्य प्रश्नों के उत्तर न लिखे जाएँ। \vert P.T.O. /23
Questions (page 2)
Q1. A rocket having initial mass 200 kg ejects fuel at the rate of 5 kg/sec with a speed of 2 km per sec vertically downwards relative to itself. Calculate its velocity 25 seconds after start, assuming initial velocity to be zero and neglecting gravity.
Q2. Show that the interval between two events in Minkowski space is independent of the frame of reference, i.e., invariant under transformation from one inertial frame to another in Minkowski space. दर्शाइए कि मिनकाउस्की स्थल (Minkowski space) में दो घटनाओं के बीच का अन्तराल निर्देश फ्रेम से स्वतंत्र है अर्थात् मिनकाउस्की स्थल के प्रत्येक जड़त्वीय फ्रेम में समान होता है। 3. For a step-index multimode fiber refractive index of core is 1.5 and \Delta = 0.015. Calculate refractive index of cladding, numerical aperture and maximum acceptance angle. कदम सूचकांक (step-index) बहुपद्धति फाइबर एक (multimode fiber) के कोर का अपवर्तनांक 1.5 एवं \Delta = 0.015 है। आवरण (cladding) का अपवर्तनांक, संख्यात्मक छिद्र (numerical aperture) तथा अधिकतम स्वीकार्य कोण (acceptance angle) ज्ञात कीजिए। A plane transmission grating having 5000 lines 4. per cm is used under normal incidence of light. Calculate the following : (a) Highest order spectrum that can be seen for the light of wavelength 6000 A 04/SBS/M-2020-12A/23 2
Q3.
For a step-index multimode fiber refractive index of core is 1.5 and \Delta = 0.015. Calculate refractive index of cladding, numerical aperture and maximum acceptance angle.
कदम सूचकांक (step-index) बहुपद्धति फाइबर एक (multimode fiber) के कोर का अपवर्तनांक 1.5 एवं \Delta = 0.015 है। आवरण (cladding) का अपवर्तनांक, संख्यात्मक छिद्र (numerical aperture) तथा अधिकतम स्वीकार्य कोण (acceptance angle) ज्ञात कीजिए।
Q4. A plane transmission grating having 5000 lines per cm is used under normal incidence of light. Calculate the following : (a) Highest order spectrum that can be seen for the light of wavelength 6000 A
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Frequently asked questions
Q1. What is the exam name observed in the document?
Physics Paper-I for the Assistant Conservator of Forests Competitive Examination (Bihar region), as indicated in the page header.
Q2. How many questions are in Page 2 content provided?
Four numbered questions are present on Page 2: Q1 to Q4.
Q3. What is the maximum marks listed for the paper?
75 marks as shown on Page 1.
Q4. Are the questions bilingual in the document?
Yes. The stems present English and Hindi text for several questions.
Q5. Are there multiple-choice options provided in Page 2?
The provided questions appear descriptive; no options are listed for the stems.
Q6. What is the paper code mentioned in the OCR text?
04/SBS/M-2020-12A/23 appears in the OCR text near the end of Page 2.