Carbonate removal from coastal sediments for the determination of organic c a...Mahbubul Hassan
The document compares two methods for removing inorganic carbon from samples to isolate organic carbon for analysis: the aqueous method using hydrochloric acid (HClaq) and the vaporous method using hydrochloric acid vapor (HClvap). It evaluates the methods based on their ability to have low blank levels, efficiently remove dolomite, yield accurate measurements of organic carbon percentage and isotopic signatures (δ13C and Δ14C). The vaporous method met all criteria if samples were not overexposed to acid. The aqueous method gave similar results but was less reliable and consistently underestimated organic carbon percentage. Optimal acid exposure times need to be determined for each sample type to obtain the most accurate isotopic measurements.
2015 01-8 pr davies spectroscopic and afm studies of the functionalisation of...Philip R. Davies
This document summarizes research on functionalizing graphite surfaces using acid treatments and deposition of gold nanoparticles. Key findings include:
1. Acid treatments like HCl and HNO3 lead to local delamination of graphite and functionalization of oxygen groups like OH at defect sites.
2. Heating treated graphite to 573K converts OH groups to C=O and C-O-C groups.
3. Gold nucleation is faster on OH-functionalized surfaces and OH provides stronger stabilization of gold nanoparticles than C=O groups based on DFT calculations.
4. Increasing acid concentration affects gold deposition, with lower concentrations producing more uniform nanoparticles due to changes in surface hydrophil
Spectroscopic and AFM studies of the functionalisation of carbonPhilip R. Davies
Short presentation to the Faraday discussion No. 173 about our studies of functional groups at carbon surfaces. We have selectively derivatised oxygen groups and can unambiguously identify OH and C=O groups. We are also fairly confident about the presence of O-C-O!
The document summarizes the synthesis of a series of bis(silirane) compounds, which are precursors to disilyne, via a molecular beam method. A tert-butyl substituted bis(silirane) was synthesized and characterized using NMR spectroscopy and X-ray crystallography. The NMR data and computational results support the bis(silirane) structure over alternative isomers. Bromination of the bis(silirane) was challenging due to side product formation, but HPLC separation yielded the pure brominated compound. The bis(silirane) and related compounds could fragment upon laser ablation to potentially generate disilyne for characterization by mass spectrometry.
Carbonate removal from coastal sediments for the determination of organic c a...Mahbubul Hassan
The document compares two methods for removing inorganic carbon from samples to isolate organic carbon for analysis: the aqueous method using hydrochloric acid (HClaq) and the vaporous method using hydrochloric acid vapor (HClvap). It evaluates the methods based on their ability to have low blank levels, efficiently remove dolomite, yield accurate measurements of organic carbon percentage and isotopic signatures (δ13C and Δ14C). The vaporous method met all criteria if samples were not overexposed to acid. The aqueous method gave similar results but was less reliable and consistently underestimated organic carbon percentage. Optimal acid exposure times need to be determined for each sample type to obtain the most accurate isotopic measurements.
2015 01-8 pr davies spectroscopic and afm studies of the functionalisation of...Philip R. Davies
This document summarizes research on functionalizing graphite surfaces using acid treatments and deposition of gold nanoparticles. Key findings include:
1. Acid treatments like HCl and HNO3 lead to local delamination of graphite and functionalization of oxygen groups like OH at defect sites.
2. Heating treated graphite to 573K converts OH groups to C=O and C-O-C groups.
3. Gold nucleation is faster on OH-functionalized surfaces and OH provides stronger stabilization of gold nanoparticles than C=O groups based on DFT calculations.
4. Increasing acid concentration affects gold deposition, with lower concentrations producing more uniform nanoparticles due to changes in surface hydrophil
Spectroscopic and AFM studies of the functionalisation of carbonPhilip R. Davies
Short presentation to the Faraday discussion No. 173 about our studies of functional groups at carbon surfaces. We have selectively derivatised oxygen groups and can unambiguously identify OH and C=O groups. We are also fairly confident about the presence of O-C-O!
The document summarizes the synthesis of a series of bis(silirane) compounds, which are precursors to disilyne, via a molecular beam method. A tert-butyl substituted bis(silirane) was synthesized and characterized using NMR spectroscopy and X-ray crystallography. The NMR data and computational results support the bis(silirane) structure over alternative isomers. Bromination of the bis(silirane) was challenging due to side product formation, but HPLC separation yielded the pure brominated compound. The bis(silirane) and related compounds could fragment upon laser ablation to potentially generate disilyne for characterization by mass spectrometry.
This document contains a biology passage with 15 multiple choice questions covering various topics in biology including cell division, plant reproduction, evolution, genetics, and ecology. It also contains a chemistry passage with 30 multiple choice questions covering topics such as chemical reactions, atomic structure, organic chemistry, and thermodynamics. Finally, it contains one mathematics question. The document tests a wide range of concepts across biology, chemistry, and a single concept in mathematics through multiple choice questions.
This document contains 6 questions regarding water hardness, its treatment and analysis. It includes sub-questions about the constituents that cause hardness, calculating hardness from ion concentrations, the terms related to hardness, and methods for determining hardness including EDTA titrations and their principles. Methods for preventing scale formation and corrosion in boilers such as conditioning and Calgon treatment are also addressed.
This document discusses a lecture about diffusion phenomena given by Tatsuya Shibata in 2012. It begins by explaining one-dimensional random walks as a model of molecular diffusion. It describes how particles undergo random displacement steps but their average position does not change over time. It also shows that the variance in a particle's position increases linearly with time, following the equation that variance is equal to 2Dt, where D is the diffusion coefficient. This models how diffusion causes the distribution of particles to broaden over time.
This document summarizes a presentation about measuring the hydrocarbon degradation capacity of the bacterium Thalassolituus oleivorans and identifying the genes involved. The objectives were to analyze the genome of T. oleivorans, design primers, quantify growth rates on different hydrocarbons, and quantify hydrocarbon degradation and differential gene expression. Results showed growth occurred on shorter chain hydrocarbons but not longer ones. The AlkB gene was found to be expressed during degradation of C10-C20 hydrocarbons. Further work will quantify degradation using GC/MS and examine expression of additional genes.
This document summarizes an investigation into the effects of palladium nanoparticles (PdNPs), pH, and temperature on the reduction of hexavalent chromium (CrVI) to its less toxic form CrIII. Key findings include:
1) The optimal conditions for the reduction reaction were pH 4 and 45°C temperature.
2) Reaction kinetics followed pseudo-first order behavior, indicating a linear decrease in CrVI over time.
3) PdNPs catalyzed the reaction, decreasing the activation energy by 20±10 kJ/mol and increasing the rate constant over an order of magnitude.
4) Under optimal conditions, a 26% reduction of CrVI was achieved.
This document provides instructions for a science exam consisting of 39 questions divided into 5 sections (A-E). Section A has 20 multiple choice questions worth 1 mark each. Section B has 6 very short answer questions worth 2 marks each. Section C has 7 short answer questions worth 3 marks each. Section D has 3 long answer questions worth 5 marks each. Section E has 3 case-based questions with sub-parts worth 4 marks total. Students are instructed to answer all questions and show work for calculations.
The document provides instructions for a physics exam being administered on November 22, 2015. It notes the exam code, time allotted, and number of questions (80 multiple choice). It provides instructions for properly filling out answer sheets and details consequences for incorrect/incomplete information. It also outlines certificates and awards for high scoring students and availability of answers/solutions online after the exam.
This document contains a sample question paper for Class 10 Science with three sections. Section A has 24 multiple choice questions to attempt 20. Section B also has 24 multiple choice questions to attempt 20. Section C has 12 questions to attempt 10. The questions cover topics in science including chemistry experiments, chemical equations, acids and bases, human anatomy, light, and electricity. Correct answers are chosen from multiple options for objective type questions.
CBSE10th Science Sample Question Paper 2019Miso Study
Misostudy offers you free CBSE10th Science Sample Question Paper 2019, These papers having most important questions that are specially designed for CBSE class 10 aspirants on the basis of latest exam pattern. Every question is solved by our expert faculty in this field.
CREST Science Olympiad exam sample paper for class 9th. Check the sample questions of CSO Olympiad exam and prepare early in order to score the best ranks.
The document is a sample science question paper for class 10 with instructions for students. It contains two sections - Section A with short answer questions worth 1-5 marks each, and Section B with multiple choice questions based on practical skills. Section A questions cover topics like the periodic table, chemistry of carbon compounds, human reproduction, environmental issues, light, and biology. Section B questions test identification and understanding of experiments related to chemistry, biology and physics concepts like reflection, refraction, and microscopy. Students are instructed to attempt all questions from both sections in the allotted time of 3 hours.
This document contains a general science exam paper with four sections - Section I contains multiple choice and short answer questions worth 10 marks, Section II contains short answer questions worth 4 marks, Section III contains short answer questions worth 16 marks, and Section IV contains a five mark question. The paper also includes a separate section with 20 multiple choice questions worth 10 marks. The summary provides an overview of the structure and content of the exam paper in 3 sentences.
9th science sample pape for summative assessment-1APEX INSTITUTE
APEX INSTITUTE has been established with sincere and positive resolve to do something rewarding for ENGG. / PRE-MEDICAL aspirants. For this the APEX INSTITUTE has been instituted to provide a relentlessly motivating and competitive atmosphere.
CBSE Science Paper | 10th Class | Mia Miaseomiamia
Mia Mia is one of the best listing website for Science Classes in Mumbai. We are also known for our systematic listing of various IPCC, Science coaching for CBSE, Engineering and other courses in Mumbai. QLI is a class where each student is our priority. We are one of the best listing website for Science Classes in Mumbai.
This document contains a model question paper for class 10 physical science with 40 total marks. It is divided into 4 sections:
1) Section I contains 4 mark questions with detailed answers required (16 marks total). Example questions include chemical reactions of calcium oxide and hydrochloric acid, and the use of detergents.
2) Section II contains short answer questions worth 4 marks total.
3) Section III contains very short answer questions worth 6 marks total.
4) Section IV contains multiple choice questions worth 6 marks total. The final section provides a blueprint of the question distribution.
APEX INSTITUTE was conceptualized in May 2008, keeping in view the dreams of young students by the vision & toil of Er. Shahid Iqbal. We had a very humble beginning as an institute for IIT-JEE / Medical, with a vision to provide an ideal launch pad for serious JEE students . We actually started to make a difference in the way students think and approach problems.
Science-Question-Bank for the class 10th studentssuneelKUMAR259
This document contains a question bank for Class 10 Biology exam. It includes questions on various topics like life processes (nutrition, respiration, transportation, excretion, coordination, control, reproduction, inheritance, environment), with some chemistry questions as well. The questions range from simple definition and labelling questions to more complex questions requiring explanations and comparisons. There are over 50 questions in total covering the entire biology syllabus for Class 10.
I got a question in web site https://www.entrancei.com can anyone help me to ...entrancei
A balloon containing 1 mole air at 1 atm initially is filled further with air till pressure increases to 4 atm. The initial diameter of the balloon is 1 m and the pressure at each stage is proportional to diameter of the balloon. How many moles of air added to change the pressure from 1 atm to 4 atm.
This document contains a biology passage with 15 multiple choice questions covering various topics in biology including cell division, plant reproduction, evolution, genetics, and ecology. It also contains a chemistry passage with 30 multiple choice questions covering topics such as chemical reactions, atomic structure, organic chemistry, and thermodynamics. Finally, it contains one mathematics question. The document tests a wide range of concepts across biology, chemistry, and a single concept in mathematics through multiple choice questions.
This document contains 6 questions regarding water hardness, its treatment and analysis. It includes sub-questions about the constituents that cause hardness, calculating hardness from ion concentrations, the terms related to hardness, and methods for determining hardness including EDTA titrations and their principles. Methods for preventing scale formation and corrosion in boilers such as conditioning and Calgon treatment are also addressed.
This document discusses a lecture about diffusion phenomena given by Tatsuya Shibata in 2012. It begins by explaining one-dimensional random walks as a model of molecular diffusion. It describes how particles undergo random displacement steps but their average position does not change over time. It also shows that the variance in a particle's position increases linearly with time, following the equation that variance is equal to 2Dt, where D is the diffusion coefficient. This models how diffusion causes the distribution of particles to broaden over time.
This document summarizes a presentation about measuring the hydrocarbon degradation capacity of the bacterium Thalassolituus oleivorans and identifying the genes involved. The objectives were to analyze the genome of T. oleivorans, design primers, quantify growth rates on different hydrocarbons, and quantify hydrocarbon degradation and differential gene expression. Results showed growth occurred on shorter chain hydrocarbons but not longer ones. The AlkB gene was found to be expressed during degradation of C10-C20 hydrocarbons. Further work will quantify degradation using GC/MS and examine expression of additional genes.
This document summarizes an investigation into the effects of palladium nanoparticles (PdNPs), pH, and temperature on the reduction of hexavalent chromium (CrVI) to its less toxic form CrIII. Key findings include:
1) The optimal conditions for the reduction reaction were pH 4 and 45°C temperature.
2) Reaction kinetics followed pseudo-first order behavior, indicating a linear decrease in CrVI over time.
3) PdNPs catalyzed the reaction, decreasing the activation energy by 20±10 kJ/mol and increasing the rate constant over an order of magnitude.
4) Under optimal conditions, a 26% reduction of CrVI was achieved.
This document provides instructions for a science exam consisting of 39 questions divided into 5 sections (A-E). Section A has 20 multiple choice questions worth 1 mark each. Section B has 6 very short answer questions worth 2 marks each. Section C has 7 short answer questions worth 3 marks each. Section D has 3 long answer questions worth 5 marks each. Section E has 3 case-based questions with sub-parts worth 4 marks total. Students are instructed to answer all questions and show work for calculations.
The document provides instructions for a physics exam being administered on November 22, 2015. It notes the exam code, time allotted, and number of questions (80 multiple choice). It provides instructions for properly filling out answer sheets and details consequences for incorrect/incomplete information. It also outlines certificates and awards for high scoring students and availability of answers/solutions online after the exam.
This document contains a sample question paper for Class 10 Science with three sections. Section A has 24 multiple choice questions to attempt 20. Section B also has 24 multiple choice questions to attempt 20. Section C has 12 questions to attempt 10. The questions cover topics in science including chemistry experiments, chemical equations, acids and bases, human anatomy, light, and electricity. Correct answers are chosen from multiple options for objective type questions.
CBSE10th Science Sample Question Paper 2019Miso Study
Misostudy offers you free CBSE10th Science Sample Question Paper 2019, These papers having most important questions that are specially designed for CBSE class 10 aspirants on the basis of latest exam pattern. Every question is solved by our expert faculty in this field.
CREST Science Olympiad exam sample paper for class 9th. Check the sample questions of CSO Olympiad exam and prepare early in order to score the best ranks.
The document is a sample science question paper for class 10 with instructions for students. It contains two sections - Section A with short answer questions worth 1-5 marks each, and Section B with multiple choice questions based on practical skills. Section A questions cover topics like the periodic table, chemistry of carbon compounds, human reproduction, environmental issues, light, and biology. Section B questions test identification and understanding of experiments related to chemistry, biology and physics concepts like reflection, refraction, and microscopy. Students are instructed to attempt all questions from both sections in the allotted time of 3 hours.
This document contains a general science exam paper with four sections - Section I contains multiple choice and short answer questions worth 10 marks, Section II contains short answer questions worth 4 marks, Section III contains short answer questions worth 16 marks, and Section IV contains a five mark question. The paper also includes a separate section with 20 multiple choice questions worth 10 marks. The summary provides an overview of the structure and content of the exam paper in 3 sentences.
9th science sample pape for summative assessment-1APEX INSTITUTE
APEX INSTITUTE has been established with sincere and positive resolve to do something rewarding for ENGG. / PRE-MEDICAL aspirants. For this the APEX INSTITUTE has been instituted to provide a relentlessly motivating and competitive atmosphere.
CBSE Science Paper | 10th Class | Mia Miaseomiamia
Mia Mia is one of the best listing website for Science Classes in Mumbai. We are also known for our systematic listing of various IPCC, Science coaching for CBSE, Engineering and other courses in Mumbai. QLI is a class where each student is our priority. We are one of the best listing website for Science Classes in Mumbai.
This document contains a model question paper for class 10 physical science with 40 total marks. It is divided into 4 sections:
1) Section I contains 4 mark questions with detailed answers required (16 marks total). Example questions include chemical reactions of calcium oxide and hydrochloric acid, and the use of detergents.
2) Section II contains short answer questions worth 4 marks total.
3) Section III contains very short answer questions worth 6 marks total.
4) Section IV contains multiple choice questions worth 6 marks total. The final section provides a blueprint of the question distribution.
APEX INSTITUTE was conceptualized in May 2008, keeping in view the dreams of young students by the vision & toil of Er. Shahid Iqbal. We had a very humble beginning as an institute for IIT-JEE / Medical, with a vision to provide an ideal launch pad for serious JEE students . We actually started to make a difference in the way students think and approach problems.
Science-Question-Bank for the class 10th studentssuneelKUMAR259
This document contains a question bank for Class 10 Biology exam. It includes questions on various topics like life processes (nutrition, respiration, transportation, excretion, coordination, control, reproduction, inheritance, environment), with some chemistry questions as well. The questions range from simple definition and labelling questions to more complex questions requiring explanations and comparisons. There are over 50 questions in total covering the entire biology syllabus for Class 10.
I got a question in web site https://www.entrancei.com can anyone help me to ...entrancei
A balloon containing 1 mole air at 1 atm initially is filled further with air till pressure increases to 4 atm. The initial diameter of the balloon is 1 m and the pressure at each stage is proportional to diameter of the balloon. How many moles of air added to change the pressure from 1 atm to 4 atm.
This document contains a model question paper for 10th standard science exam. It has 3 sections with a total of 75 marks. Section A contains 15 multiple choice questions with 1 mark each. Section B contains 20 short answer questions with 2 marks each. Section C contains 4 long answer questions with 5 marks each, with questions from 4 groups where students must answer 1 question from each group. The document provides sample questions on various science topics to test students' understanding of concepts and principles.
This document provides instructions for a sample science test for Class 10. It consists of 5 sections with a total of 39 questions. Section A has 20 objective type questions carrying 1 mark each. Section B has 6 very short answer questions carrying 2 marks each. Section C has 7 short answer questions carrying 3 marks each. Section D has 3 long answer questions carrying 5 marks each. Section E has 3 source-based/case-based questions carrying 4 marks each with sub-parts. The document provides examples of questions from Section A to illustrate the format and level of difficulty.
This document contains a mixture of questions related to science topics like heat, temperature, chemical reactions, acids and bases. It includes fill-in-the-blank questions, multiple choice questions, and questions asking to identify substances, experimental setups, chemical equations and more. The document tests knowledge across various concepts in chemistry.
Sample paper of science for class 9 will help assess the preparation of the student and enable them to gain insights into their strength and weakness. Based on the same, students can plan their revision strategy accordingly.
CREST Reasoning Olympiad exam sample paper for class 8. Refer to the sample papers of CRO exam and prepare for it accordingly in order to score the best ranks.
CREST English Olympiad exam sample paper for class 1. Check the exam questions and get an overview of the CEO Olympiad exam in order to score the best numbers in it.
This document contains a sample paper for the Crest Mathematics Olympiad (CMO) exam. The sample paper includes 10 multiple choice questions covering topics like integers, geometry, ratios, and word problems. It also provides the class-wise question distribution and marking scheme for the CMO exam. The syllabus for the CMO can be found online at the provided URL. The document seeks to enhance students' practical mathematics knowledge through this digital exam initiative.
CREST Maths Olympiad exam sample paper for class 2. Check the sample questions and get an overview of the CMO Olympiad Exams and start an early preparation. This will help you to get best scores in CREST Maths Olympiad.
CREST Mathematics Olympiad exam sample paper for class 1. Get an overview of the exam pattern of CMO Class 1 exam with the questions and prepare early for the exam.
(1) The document contains a sample paper for a mathematics olympiad competition with 10 multiple choice questions covering topics like factors, geometry, expenses, graphs, and statistics.
(2) It also provides the class-wise syllabus and marking scheme for the exam, with practical mathematics questions worth 1 mark each and an achievers section worth 2 marks per question.
(3) Additional information is given on CREST Olympiads, a digital initiative to enhance practical mathematics knowledge through such competitive exams.
A workshop hosted by the South African Journal of Science aimed at postgraduate students and early career researchers with little or no experience in writing and publishing journal articles.
Strategies for Effective Upskilling is a presentation by Chinwendu Peace in a Your Skill Boost Masterclass organisation by the Excellence Foundation for South Sudan on 08th and 09th June 2024 from 1 PM to 3 PM on each day.
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UPRAHUL
This Dissertation explores the particular circumstances of Mirzapur, a region located in the
core of India. Mirzapur, with its varied terrains and abundant biodiversity, offers an optimal
environment for investigating the changes in vegetation cover dynamics. Our study utilizes
advanced technologies such as GIS (Geographic Information Systems) and Remote sensing to
analyze the transformations that have taken place over the course of a decade.
The complex relationship between human activities and the environment has been the focus
of extensive research and worry. As the global community grapples with swift urbanization,
population expansion, and economic progress, the effects on natural ecosystems are becoming
more evident. A crucial element of this impact is the alteration of vegetation cover, which plays a
significant role in maintaining the ecological equilibrium of our planet.Land serves as the foundation for all human activities and provides the necessary materials for
these activities. As the most crucial natural resource, its utilization by humans results in different
'Land uses,' which are determined by both human activities and the physical characteristics of the
land.
The utilization of land is impacted by human needs and environmental factors. In countries
like India, rapid population growth and the emphasis on extensive resource exploitation can lead
to significant land degradation, adversely affecting the region's land cover.
Therefore, human intervention has significantly influenced land use patterns over many
centuries, evolving its structure over time and space. In the present era, these changes have
accelerated due to factors such as agriculture and urbanization. Information regarding land use and
cover is essential for various planning and management tasks related to the Earth's surface,
providing crucial environmental data for scientific, resource management, policy purposes, and
diverse human activities.
Accurate understanding of land use and cover is imperative for the development planning
of any area. Consequently, a wide range of professionals, including earth system scientists, land
and water managers, and urban planners, are interested in obtaining data on land use and cover
changes, conversion trends, and other related patterns. The spatial dimensions of land use and
cover support policymakers and scientists in making well-informed decisions, as alterations in
these patterns indicate shifts in economic and social conditions. Monitoring such changes with the
help of Advanced technologies like Remote Sensing and Geographic Information Systems is
crucial for coordinated efforts across different administrative levels. Advanced technologies like
Remote Sensing and Geographic Information Systems
9
Changes in vegetation cover refer to variations in the distribution, composition, and overall
structure of plant communities across different temporal and spatial scales. These changes can
occur natural.
Walmart Business+ and Spark Good for Nonprofits.pdfTechSoup
"Learn about all the ways Walmart supports nonprofit organizations.
You will hear from Liz Willett, the Head of Nonprofits, and hear about what Walmart is doing to help nonprofits, including Walmart Business and Spark Good. Walmart Business+ is a new offer for nonprofits that offers discounts and also streamlines nonprofits order and expense tracking, saving time and money.
The webinar may also give some examples on how nonprofits can best leverage Walmart Business+.
The event will cover the following::
Walmart Business + (https://business.walmart.com/plus) is a new shopping experience for nonprofits, schools, and local business customers that connects an exclusive online shopping experience to stores. Benefits include free delivery and shipping, a 'Spend Analytics” feature, special discounts, deals and tax-exempt shopping.
Special TechSoup offer for a free 180 days membership, and up to $150 in discounts on eligible orders.
Spark Good (walmart.com/sparkgood) is a charitable platform that enables nonprofits to receive donations directly from customers and associates.
Answers about how you can do more with Walmart!"
This slide is special for master students (MIBS & MIFB) in UUM. Also useful for readers who are interested in the topic of contemporary Islamic banking.
Main Java[All of the Base Concepts}.docxadhitya5119
This is part 1 of my Java Learning Journey. This Contains Custom methods, classes, constructors, packages, multithreading , try- catch block, finally block and more.
বাংলাদেশের অর্থনৈতিক সমীক্ষা ২০২৪ [Bangladesh Economic Review 2024 Bangla.pdf] কম্পিউটার , ট্যাব ও স্মার্ট ফোন ভার্সন সহ সম্পূর্ণ বাংলা ই-বুক বা pdf বই " সুচিপত্র ...বুকমার্ক মেনু 🔖 ও হাইপার লিংক মেনু 📝👆 যুক্ত ..
আমাদের সবার জন্য খুব খুব গুরুত্বপূর্ণ একটি বই ..বিসিএস, ব্যাংক, ইউনিভার্সিটি ভর্তি ও যে কোন প্রতিযোগিতা মূলক পরীক্ষার জন্য এর খুব ইম্পরট্যান্ট একটি বিষয় ...তাছাড়া বাংলাদেশের সাম্প্রতিক যে কোন ডাটা বা তথ্য এই বইতে পাবেন ...
তাই একজন নাগরিক হিসাবে এই তথ্য গুলো আপনার জানা প্রয়োজন ...।
বিসিএস ও ব্যাংক এর লিখিত পরীক্ষা ...+এছাড়া মাধ্যমিক ও উচ্চমাধ্যমিকের স্টুডেন্টদের জন্য অনেক কাজে আসবে ...
How to Add Chatter in the odoo 17 ERP ModuleCeline George
In Odoo, the chatter is like a chat tool that helps you work together on records. You can leave notes and track things, making it easier to talk with your team and partners. Inside chatter, all communication history, activity, and changes will be displayed.
The simplified electron and muon model, Oscillating Spacetime: The Foundation...RitikBhardwaj56
Discover the Simplified Electron and Muon Model: A New Wave-Based Approach to Understanding Particles delves into a groundbreaking theory that presents electrons and muons as rotating soliton waves within oscillating spacetime. Geared towards students, researchers, and science buffs, this book breaks down complex ideas into simple explanations. It covers topics such as electron waves, temporal dynamics, and the implications of this model on particle physics. With clear illustrations and easy-to-follow explanations, readers will gain a new outlook on the universe's fundamental nature.
Exploiting Artificial Intelligence for Empowering Researchers and Faculty, In...Dr. Vinod Kumar Kanvaria
Exploiting Artificial Intelligence for Empowering Researchers and Faculty,
International FDP on Fundamentals of Research in Social Sciences
at Integral University, Lucknow, 06.06.2024
By Dr. Vinod Kumar Kanvaria
Exploiting Artificial Intelligence for Empowering Researchers and Faculty, In...
Cso sample-papers-for-class-10
1. CLASS
10
SAMPLE PAPER
CREST Science Olympiad (CSO)
1
1. Three resistors Ra, Rb and Rc are connected to form the sides of a triangle N1N2N3. The
resistance of side N1N3 is 80 Ω, side N1N2 is 50 Ω and that of side N2N3 is 70 Ω.
Find the effective resistance between points N1 and N3.
a) 48 Ω b) 40 Ω
c) 58 Ω d) 60 Ω
Class Topic/Section No. of Questions Marks per Questions Total Marks
Practical Science 25 1 25
1st
to 4th
Achievers Section 10 2 20
Grand Total 35 - 45
Practical Science 40 1 40
5th
to 10th
Achievers Section 10 2 20
Grand Total 50 - 60
Syllabus for CSO is available at https://www.crestolympiads.com/cso-syllabus
Pattern And Marking Scheme
2. 2
2. A tank is filled with water to a height of 10 cm. The apparent depth of the stone lying at
the bottom of the tank is measured to be 7.5 cm.
i. What is the refractive index of water?
ii. If water is replaced by a liquid of refractive index 1.6 up to same height, what will be
the new apparent depth of the stone?
a) i: 1.43, ii: 6.25 cm b) i: 1.33, ii: 8.25 cm
c) i: 1.33, ii: 6.25 cm d) i: 1.43, ii: 9.25 cm
3. Which of the following sequences in is the correct order to know the steps involved to
test the presence of starch in a leaf?
P - Boil the leaf in alcohol in a water bath
Q - Add iodine solution
R - Wash the leaf in water
S - Boil the leaf in water
a) S, Q, R and P b) P, S, Q and R
c) Q, R, P and S d) S, P, R and Q
CREST Olympiads – A digital initiative to
enhance practical knowledge
3. 3
4. Carefully look at the figure below. A magnet is approaching a solenoid with a constant
speed v.
(i) What is the magnetic pole induced at the portion A and B of the solenoid and the
v direction of the induced current into the galvanometer (G)?
a) (i)- Polarity at A: N, Polarity at B: S, Direction of the induced current: From the left
b) (i)- Polarity at A: S, Polarity at B: N, Direction of the induced current: From the left
c) (i)- Polarity at A: S, Polarity at B: N, Direction of the induced current: From the right
d) (i)- Polarity at A: N, Polarity at B: S, Direction of the induced current: From the right
5. In a lab experiment, four students Sam, Sarah, Rayan and James were given
colourless liquids W (water), X (lemon juice), Y (mixture of water and lemon juice). The
students tested the liquids with pH paper and reported the following sequences in
colour change of pH paper:
Which of the following student reported the colour change of the pH paper Correctly?
a) Sam b) Sarah
c) Rayan d) James
Students W X Y
Sam Blue Red Green
Sarah Red Green Green
Rayan Orange Green Green
James Green Red Red
CREST Olympiads – A digital initiative to
enhance practical knowledge
4. 4
6. 5 ml of an aqueous solution of barium chloride was taken in a test tube A and an equal
amount of sodium sulphate solution was taken in another test tube B. In another
beaker, solutions from test tube A and B were added together, and the colour of the
precipitate formed was noted.
Which of the following observation is correct?
a) Reaction: Double displacement reaction, Precipitate: BaSO4 (white)
b) Reaction: Double displacement reaction, Precipitate: Sodium chloride (white)
c) Reaction: Displacement reaction, Precipitate: Sodium chloride (yellow)
d) Reaction: Displacement reaction, Precipitate: BaSO4 (white)
7. Consider the following experiment:
A small amount of sodium bicarbonate is taken in a test tube and a sufficient amount of
acetic acid is added to it. In the reaction, a gas is evolved. This evolved gas is then
passed through the lime water.
Which of the following is the correct observation of the above experiment?
a) The gas evolved is hydrogen and it does not change the colour of lime water.
b) The gas evolved is carbon dioxide and it does not change the colour of lime water.
c) The gas evolved is hydrogen and it turns the lime water milky.
d) The gas evolved is carbon dioxide and it turns the lime water milky.
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5. 5
8. Correct the given statements by replacing the underlined words and select the correct
option.
(i) The leaves of the mimosa plant fold up quickly, when touched with a finger. This is
h an example of chemotropism.
(ii) Thigmotropism is a nastic movement of a plant part (like petals of flower) in
n response to light.
(iii) Cytokinins are the plant hormones which causes the bending of the root of the
m plant away from a source of light.
(iv) Most of the plant hormones promotes the plant growth. Ascorbic acid is a plant
b hormone which inhibits the plant growth.
a) i-Thigmonasty, ii-Photonasty, iii-Auxins, iv-Abscisic acid
b) i-Chemotropism, ii-Photonasty, iii-Gibberellin, iv-Ethene
c) i-Hydrotropism, ii-Chemotropism, iii- Abscisic acid, iv-Ethene
d) i- Thigmonasty, ii-Chemotropism, iii- Auxins, iv-Ethene
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6. 6
9. Four test tubes were taken and marked 1, 2, 3 and 4 respectively. 20 ml solution of
ZnSO4, CuSO4, Al2(SO4)3, FeSO4 was taken in each beaker and the initial colour of
these solutions was noted. Fe rod was inserted in each solution and left undisturbed for
2 hours, the colour of each solution was again noted.
Which of the following correctly shows the change of colour of each solution?
a) 1 2 3 4
Change in
colour
Colourless Light blue No change Colourless
b) 1 2 3 4
Change in
colour
No change Green No change No change
c) 1 2 3 4
Change in
colour
Colourless No change No change Colourless
d) 1 2 3 4
Change in
colour
Colourless Light green No change Colourless
Achiever’s Section
7. 7
10. Refer to the given figure and select the incorrect statements:
(i) The part labelled ‘P’ contains the female reproductive cell of plants.
(ii) The part labelled ‘Q’ contains ovules which develops into seed upon fertilization.
(iii) The part labelled ‘R’ is the tube through which cells produced by pollen grain
k reaches the ovary.
(iv) The part labelled ‘S’ is the part of the pistil where fertilization takes place.
Which of the above statements is/are incorrect?
a) Only (i) b) Only (iii)
b) Both (i) and (iv) d) (ii), (iii) and (iv)
1.(a), 2. (c), 3. (d), 4. (a), 5. (d), 6. (a), 7. (d), 8. (a), 9 (b), 10. (b)
Answers
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