Which species would act as the cathode in the following reaction- - 4.docx

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Which species would act as the cathode in the following reaction? ? 4 Au(s) + 16 Cl - (aq) + 3 O 2 (g) + 6 H 2 O( l ) ? 4 AuCl 4 - (aq) + 12 OH - (aq) Select one: a. Pt(s) b. Cl - (aq) c. O 2 (g) d. Au(s) Solution Cathode is a negatively charged electrode at which the reduction takes place that is the cathode provides the electron to the positively charged ions In this cell reaction the Au(s) converted to Au 3+ ion. When the Au3+ ion moves toward the Au(s) the the reduction takes place hence the Au(s) act as cathode .

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Which species would act as the cathode in the following reaction- - 4.docx

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Which of the following is likely to contradict Samuel Huntington\'s idea that Mexican migrants to the US may not have an \"Americano dream?\" a. Mexican-American consumption pattern is not too different from the consumption pattern of rest of America. b. Mexican immigrants who come from Mexican villages take longer to assimilate, but the educated Mexican immigrants assimilate readily. c. Latinos are quite adept at climbing out of poverty. Sixty-eight percent of those who have been in this country 30 years, own their own homes. d. A large number of Mexican-Americans join the US Army. e. All of the above Solution e. All of the abovee. All of the above .

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Which of the following is correct? (a) Function dependencies are not associated with relations they are based on the semantics of information that we are dealing with (b) If a relation has no redundant information its attributes must not have any function dependencies (c) Functional dependencies may be determined if we are given several instances of a relation (d) The FDs that hold for attributes of a relation need not be satisfied at all times (e) BCNF is a fourth normal form. Solution Function dependencies are not associated with relations they are based on the semantics of information that we are dealing with .

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Which of the following is considered middleware? A. Atomicity B. OLE C. CORBA D. Object-oriented programming Solution C. Common Object Request Broker Architecture (CORBA) is vendor-independent middleware. Its purpose is to tie together different vendor products so that they can seamlessly work together over distributed networks. Answer B is incorrect because Object Linking and Embedding (OLE) is a proprietary system developed by Microsoft to allow applications to transfer and share information. Answer A is incorrect because atomicity deals with the validity of database transactions. Answer D is incorrect because object-oriented programming is a modular form of programming. .

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Which of the following is an effective method of preventing computer viruses from spreading? A. Require root/administrator access to run programs. B. Enable scanning of e-mail attachments. C. Prevent the execution of .vbs files. D. Install a host based IDS (Intrusion Detection System) Solution D. Install a host based IDS (Intrusion Detection System) Dictionaries may be used in a cracking program to determine passwords. A short dictionary attack involves trying a list of hundreds or thousands of words that are frequently chosen as passwords against several systems. Although most systems resist such attacks, some do not. In one case, one system in five yielded to a particular dictionary attack. Incorrect answers: .

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Which of the following ions are likely not to exist in biological settings. Why? Ca+ Zn2+ Zn3+ Hg+ H- Fe3+ Pb4+ Au3+ I2- S2- Solution Ca+, Zn3+, Hg+, Au3+, I2- are likely to be not exist bilogical settings because Ca+ has released one electron from 4s orbital and have partially filled s orbital which is very rare Zn3+ has released 3 electrons and have 4s orbital empty and 3d orbital with 9 electrons. After ejection of 2 electrons Zn will not loose electron further from fully filled 3d orbital Hg+ has 6s orbital half filled which is very rare same as Ca+ Au3+ has 6s orbital blank and 5d orbital have 8 electron which is partially filled so it also very tidious to stable I2- : since Iodine is a halogen so it need only one electron to become stable so it qill not retain 2 electron. .

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Which of the following international organizations was established to standardize the handling of forensic evidence? A. The International Organization on Forensic Analysis B. The EU Policy Council of Criminal Evidence C. The United Nations Organization on Computer Evidence D. The International Organization on Computer Evidence Solution The International Organization on Computer Evidence- IOCE is composed of accredited government agencies which are actively involved in computer forensic investigations. The members of IOCE are involved in identification and discussion on topics of mutual interest, while the organizations also facilitate the dissemination of information on international level. The organization is also involved in the development of recommendations which are considered by its members .

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Which of the following file structures is associated with the phenomenon of collisions? Hash Sequential Indexed All of the above Solution option A In general hash collisions occur if the hash is smaller than the data. It\'s fairly intuitive that you can\'t uniquely represent the numbers 1 - 10 in anything less than 10 numbers. The same is true for hash functions - to prevent collisions, there needs to be as many possible hashes as possible inputs. .

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which of the following elements would you expect to form mainly covalent bonds? Oxygen, potassium, phosphorus, fluorine, hydrogen, rubidium (how do you know if an element will have a covalent or ionic bond?) Solution Ionic compound: The ionic compound which consist ionic bond. The ionic bond is a type of bond which formed between positive and negative ions or one metal and one non-metal. Covalent compound: The covalent compound which consist covalent bond. The covalent bond is a type of bond which formed by sharing of electrons between atoms. It forms between two non-metals. P and H are mainly non-metal thus they will form covalent bonds. If an element is metal then it will from ionic bond. If element is non-metal like H2, N2 then it will from covalent bond. .

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which technique allows multiple applications to share a transport connection broadcasting multiplexing encapsulation segmentation Solution Broadcasting refers to transmitting a packet that will be received by every device on the network. Multiplexing is a method by which multiple analog or digital signals are combined into one signal over a shared medium to share an expensive resource. Encapsulation is a method of designing modular communication protocols in which logically separate functions in the network are abstracted from their underlying structures by inclusion or information hiding within higher level objects. Segmentation is the process of breaking a packet into smaller units at the Transport layerÂ Â before transmission. .

which technique allows multiple applications to share a transport conn.docx

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which statements are correct w ith the transport layer: i the ultimate goal is to provide efficient, reliable and cost-effective data transmission service to processes in the application layer (its users) ii to allow users to access the transport service, the transport layer must provide some operations to application programs - a transport service interface; its primitives include: LISTEN, CONNECT, SEND, and more iii the messages send from a transport layer (entity) to its peer (the transport layer on the receiving machine) are called segments; therefore, segments are contained in packets (exchanged by the network layer), which are contained in frames (exchanged by the data link layer) Solution i,ii and iii All three statements mentioned are correct for Transport Layer .

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Which of the following is not a function of decomposition? (Points : 5) Permit different parts of the system to be built at the same time by the same person. Allow attention to be concentrated on the part of the system pertinent to a particular audience, without confusing people with details irrelevant to their interests. Facilitate the focusing of attention on one area (subsystem) at a time without interference from other parts. Break a system into smaller, more manageable, and understandable subsystems. Build different parts of the system at independent times and have the help of different analysts. Solution Which of the following is not a function of decomposition Ans- Permit different parts of the system to be built at the same time by the same person .

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