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Noun (National open university) Live 2019 POP Exam questions
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[QUOTE="Bracet, post: 3966, member: 477"] [B][IMG]file:///C:%5CUsers%5Cuser%5CAppData%5CLocal%5CTemp%5Cmsohtmlclip1%5C01%5Cclip_image001.png[/IMG][/B] [B]NATIONAL OPEN UNIVERSITY OF NIGERIA[/B] [B]PLOT 91, CADASTRAL ZONE, NNAMDI AZIKIWE EXPRESSWAY, JABI - ABUJA[/B] [B]FACULTY OF SCIENCES[/B] [B]DEPARTMENT OF PURE AND APPLIED SCIENCE[/B] [B]2019_1 SEMESTER EXAMINATION[/B] [B]COURSE CODE: PHY 456[/B] [B]COURSE TITLE: NUCLEAR REACTOR PHYSICS[/B] [B]CREDIT UNIT 3[/B] [B]TIME ALLOWED ([/B][B]2[/B][B]½[/B][B] HRS)[/B] [B]INSTRUCTION: [/B][B][I]Answer question one (1) and any other four (4)questions[/I][/B] [B]QUESTION 1[/B] (a). List five ways in which neutrons can interact with nuclei. [B](2.5 marks)[/B] (b). What is a moderator? [B](4 marks)[/B] (c). What is a nuclear reactor? [B](4 marks)[/B] (d). What is meant by the following terms: nuclear power, nuclear energy and atomic energy? [B](4.5 marks)[/B] (e). Consider the following nuclear fusion reaction that uses deuterium and tritium as fuel. (i). Complete the reaction equation. What is the name of the new particle released during the reaction? [B] (2 marks)[/B] (ii). Given the following information; ,, , Determine the mass defect of a single reaction [B](2 marks)[/B] (iii). Determine the energy in joules released during a single fusion reaction. [B](3 marks)[/B] [B]QUESTION 2[/B] (a). Explain, using your knowledge of criticality and nuclear reactions, why water makes a fantastic moderator. [B](4 marks)[/B] (b). What are the qualities of a good control rod material? [B](2 marks)[/B] (c). Define the following terms: (i) subcritical system; [B](2 marks)[/B] (ii) critical system; [B](2 marks)[/B] and supercritical system [B](2 marks)[/B] [B]QUESTION 3[/B] (a). If there are n scattering centers (nuclei) per unit volume, each of area σ, in a thin target of thickness dT, find the ratio R of the area covered by scattering centers to the total are of the targets. [B](2 marks)[/B] (b). Given that and . Show that. It must be assumed that all symbols carried their usual meanings. [B](7 marks)[/B] (c). Describe moderation. [B](3 marks)[/B] [B]QUESTION 4[/B] (a).What is macroscopic cross section? [B](1.5 marks)[/B] (b). Why is it possible to produce the fission of U-235 with slow neutrons whereas it is necessary to use fast neutrons to produce the fission of U-238? [B](9 marks)[/B] (c). Define cross section [B](1.5 marks)[/B] [B]QUESTION 5[/B] (a). Concisely discuss the following as related to nuclear reaction: (i) Radiative capture [B](1.5marks)[/B]; (ii) Charged-particle reactions [B](1.5marks)[/B] (b). Write a short note on (i). Nuclear fission[B](2 marks)[/B] (ii). Nuclear fusion [B](2 marks)[/B] (c). Determine the product nucleus and Q value in the equation comment on your result. (Masses of Al, Mg, d and α are 26.9901 amu, 24.9936 amu, 2.0147 amu and 4.0039 amu respectively) [B](5marks)[/B] [B]QUESTION 6[/B] (a). Determine the unknown particles X in the following nuclear reactions: [LIST] [*], [B](2 marks) [/B] [*], [B](2 marks)[/B] [*][B](2 marks)[/B] [/LIST] (b). As observed in the laboratory system, a 8 MeV proton is incident on a stationary carbon-12 target. Find the velocity of the centre of mass system. Take the mass of the proton to be 1 amu. [B](4 marks)[/B] (c). State Fick’s law. [B](2 marks)[/B] NATIONAL OPEN UNIVERSITY OF NIGERIA DEPARTMENT OF CRIMINOLOGY AND SECURITY STUDIES FACULTY OF SOCIAL SCIENCES 2019_1 EXAMINATION QUESTIONS COURSE CODE: CSS 356 COURSE TITLE: TRADITIONAL AND INFORMAL MECHANISMS OF CRIME CONTROL CREDIT UNIT: 3 TME ALLOWED: 3 HOURS INSTRUCTION: ANSWER ANY FOUR QUESTIONS [LIST=1] [*]Differentiate between traditional and informal mechanism of crime control. (17.5 marks) [/LIST][LIST=1] [*]Explain the relationship among control, justice and law. (17.5 marks) [/LIST][LIST=1] [*]Discuss the factors enabling indigenous social control in modern African States. (17.5 marks) [/LIST][LIST=1] [*]Briefly discuss the functions of the “Ayelala” traditional control mechanism of crime. (17.5 marks). [/LIST][LIST=1] [*]Discuss the main characteristics of traditional, Informal justice system that explains their contribution to better access to crime control. (17.5 marks) [/LIST][LIST=1] [*]Explain the reasons why some people may not use formal control mechanism. (17.5Marks) [/LIST] [/QUOTE]
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