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*COMPUTER STUDIES* (4a) (i) Videoconference: Videoconferencing allows people in different locations to hold face-to-face meetings without having to move to a single location physically. It is widely used for business meetings, distance education, and medical consultations. Participants can see and hear each other in real-time through video and audio communication, share documents, and collaborate effectively. (ii) Telepresence: Telepresence refers to technologies that allow a person to feel as if they were present at a location other than their true location. It often involves sophisticated video conferencing equipment that provides high-definition video and audio, making it seem like participants are in the same room. Telepresence aims to create a more immersive and realistic interaction, enhancing remote communication. (iii) Teleconference: Teleconferencing is a telephone meeting among two or more participants involving technology more sophisticated than a simple two-way phone connection. It may involve audio, video, and data sharing. Teleconferencing is used for business meetings, training sessions, and seminars, enabling people to connect and collaborate without the need for physical travel. (4b) 10 LET sum = 0 20 FOR i = 11 TO 50 STEP 2 30 LET sum = sum + i 40 NEXT i 50 PRINT "The sum of odd numbers from 11 to 50 is "; sum 60 END

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*NABTEB 2024 GENERAL WOOD WORK* WOODWORK OBJ 01-10: DCDBACBBCC 11-20: ACCDABADDC 21-30: BDCABBACBD 31-40: CACAABCDAC COMPLETED ======================== `ANSWER FOUR(4) QUESTIONS ONLY``` (1a) Conversion of timber refers to the process of transforming logs into usable lumber or wood products, such as boards, planks, and beams. (1b) Diagram ======================== (2a) The properties of timber refer to its characteristics that define its suitability and behavior for various applications. These properties include Strength, Density, Durability, Workability, Moisture Content, Color and Grain, and Fire Resistance (2b) Wood refers to the raw material in its natural state, including logs, branches, and other plant material while Timber refers to wood that has been processed and prepared for use in construction, furniture-making, or other applications. Timber is typically sawn, planed, and seasoned to enhance its properties and make it suitable for specific uses. ======================== (3a) Hardened timber: Timber that has been over-dried or exposed to high temperatures, causing it to become excessively hard and brittle. May lead to cracking and splitting. Collapsed timber: Timber that has been subjected to excessive moisture, causing the cells to collapse and the wood to shrink and distort. May lead to a significant loss of strength and structural integrity. (3b) Decay refers to the breakdown of wood tissue due to the action of fungi, bacteria, or insects. It can lead to, Rotting, Softening, Discoloration, Loss of strength and structural integrity ======================== (5) (i) Backsaw: A general-purpose saw for precise cutting, ideal for joinery, cabinetry, and furniture-making. (ii) Dovetail Saw: Designed for cutting dovetails and other fine woodworking tasks, perfect for achieving accurate cuts in hardwoods or dense materials. (iii) Tenon Saw: Used for cutting tenons, mortise and tenon joints, and other precise cuts, its rigid blade and comfortable handle make it a favorite among woodworkers. ======================== *COMPLETED*

NABTEB 2024 PLUMBING & PIPE FITTING ANSWERS PLUMBING OBJ 01-10: BDAAABCABD 11-20: ABDAACCBCA 21-30: CBADADCBAC 31-40: ACACCBADDC Solved by MR FEMI SOLUTIONS COMPLETED ANSWER FIVE QUESTIONS ONLY (1a) (i) Wear appropriate personal protective equipment (PPE) such as welding helmets, gloves, and safety glasses. (ii) Ensure proper ventilation in the workshop to prevent inhalation of fumes and gases. (iii) Keep flammable materials and sparks away from the welding area. (iv) Ensure the welding machine is properly grounded and installed. (v) Use proper welding techniques to avoid electrical shock and eye damage. (vi) Keep a fire extinguisher nearby and ensure easy access to emergency services. (1b) (i) Connect the oxygen cylinder to the regulator. (ii) Attach the acetylene cylinder to the regulator. (iii) Connect the hoses to the regulators and torch. (iv) Ensure all connections are secure and leak-free. (v) Turn on the oxygen and acetylene supplies. (vi) Adjust the regulators to achieve the proper flame. =========================== (2a) [img]https://i.ibb.co/3Bvrrpy/Leftward-technique.jpg[/img] (2b) (i) Pressure reduction: Regulators reduce the high pressure of the gas cylinders (up to 2,000 psi) to a safe and usable pressure (typically 10-20 psi) for welding. (ii) Flow control: Regulators control the flow rate of gas to the torch, ensuring a consistent and precise amount of gas is delivered. (iii) Pressure stabilization: Regulators maintain a constant output pressure, despite changes in cylinder pressure or welding conditions. (iv) Safety: Regulators prevent excessive gas flow, which can lead to fires or explosions. =========================== (3a) (i) Water is a solvent: Water is a solvent because it has the ability to dissolve a wide variety of substances, such as salts, sugars, and other polar compounds. This is due to its polar nature, which allows it to form hydrogen bonds with other molecules, making it an excellent dissolving agent. (ii) Culpro-solvency: Cupro-solvency refers to the ability of a solution to dissolve copper. Cupro-solvents are used to remove copper oxides and other copper compounds from surfaces. Cupro-solvency is important in various industries, such as electronics, where copper is used extensively. (iii) Plumbio-solvency: Plumbio-solvency refers to the ability of a solution to dissolve lead (plumbum in Latin). Plumbio-solvents are used to remove lead-based paints, coatings, and other lead compounds from surfaces. Plumbio-solvency is important in various industries, such as construction and renovation, where lead-based materials are present. (3b) [img]https://i.ibb.co/qgD3qhF/trap.jpg[/img][/url] =========================== (4) [img]https://i.ibb.co/JnB9Jpf/two-pipe-system.jpg[/img] =========================== (5a) =MERITS= (i) Resistance to corrosion: PVC pipes are resistant to corrosion, making them durable and long-lasting. (ii) Low maintenance: PVC pipes require minimal maintenance, as they are resistant to scaling and pitting. (iii) Cost-effective: PVC pipes are generally cheaper than other materials, making them a cost-effective option. =DEMERITS= (i) Limited heat resistance: PVC pipes can degrade when exposed to high temperatures, making them unsuitable for hot water supply. (ii) Prone to cracking: PVC pipes can crack and become brittle with age, leading to leaks and failures. (iii) Environmental concerns: PVC production and disposal can have negative environmental impacts. (5bi) Surface Water: -Rivers -Lakes (5bii) Groundwater: -Wells -Boreholes (5biii) Rainwater Harvesting: -Rainwater collected from roofs -Rainwater stored in cisterns or tanks =========================== COMPLETED

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NABTEB 2024 PLUMBING & PIPE FITTING ANSWERS PLUMBING OBJ 01-10: BDAAABCABD 11-20: ABDAACCBCA 21-30: CBADADCBAC 31-40: ACACCBADDC Solved by Examking.net COMPLETED ANSWER FIVE QUESTIONS ONLY (1a) (i) Wear appropriate personal protective equipment (PPE) such as welding helmets, gloves, and safety glasses. (ii) Ensure proper ventilation in the workshop to prevent inhalation of fumes and gases. (iii) Keep flammable materials and sparks away from the welding area. (iv) Ensure the welding machine is properly grounded and installed. (v) Use proper welding techniques to avoid electrical shock and eye damage. (vi) Keep a fire extinguisher nearby and ensure easy access to emergency services. (1b) (i) Connect the oxygen cylinder to the regulator. (ii) Attach the acetylene cylinder to the regulator. (iii) Connect the hoses to the regulators and torch. (iv) Ensure all connections are secure and leak-free. (v) Turn on the oxygen and acetylene supplies. (vi) Adjust the regulators to achieve the proper flame. =========================== (2a) [img]https://i.ibb.co/3Bvrrpy/Leftward-technique.jpg[/img] (2b) (i) Pressure reduction: Regulators reduce the high pressure of the gas cylinders (up to 2,000 psi) to a safe and usable pressure (typically 10-20 psi) for welding. (ii) Flow control: Regulators control the flow rate of gas to the torch, ensuring a consistent and precise amount of gas is delivered. (iii) Pressure stabilization: Regulators maintain a constant output pressure, despite changes in cylinder pressure or welding conditions. (iv) Safety: Regulators prevent excessive gas flow, which can lead to fires or explosions. =========================== (3a) (i) Water is a solvent: Water is a solvent because it has the ability to dissolve a wide variety of substances, such as salts, sugars, and other polar compounds. This is due to its polar nature, which allows it to form hydrogen bonds with other molecules, making it an excellent dissolving agent. (ii) Culpro-solvency: Cupro-solvency refers to the ability of a solution to dissolve copper. Cupro-solvents are used to remove copper oxides and other copper compounds from surfaces. Cupro-solvency is important in various industries, such as electronics, where copper is used extensively. (iii) Plumbio-solvency: Plumbio-solvency refers to the ability of a solution to dissolve lead (plumbum in Latin). Plumbio-solvents are used to remove lead-based paints, coatings, and other lead compounds from surfaces. Plumbio-solvency is important in various industries, such as construction and renovation, where lead-based materials are present. (3b) [img]https://i.ibb.co/qgD3qhF/trap.jpg[/img][/url] =========================== (4) [img]https://i.ibb.co/JnB9Jpf/two-pipe-system.jpg[/img] =========================== (5a) =MERITS= (i) Resistance to corrosion: PVC pipes are resistant to corrosion, making them durable and long-lasting. (ii) Low maintenance: PVC pipes require minimal maintenance, as they are resistant to scaling and pitting. (iii) Cost-effective: PVC pipes are generally cheaper than other materials, making them a cost-effective option. =DEMERITS= (i) Limited heat resistance: PVC pipes can degrade when exposed to high temperatures, making them unsuitable for hot water supply. (ii) Prone to cracking: PVC pipes can crack and become brittle with age, leading to leaks and failures. (iii) Environmental concerns: PVC production and disposal can have negative environmental impacts. (5bi) Surface Water: -Rivers -Lakes (5bii) Groundwater: -Wells -Boreholes (5biii) Rainwater Harvesting: -Rainwater collected from roofs -Rainwater stored in cisterns or tanks =========================== COMPLETED

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