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  Q & A > ICSE Board Exam : Class X Solved Question Papers Class 10 Sample / Model Papers for Download - Previous Years What is the difference between Presbyopia and Hyperopia? Asked by: ajinsumesh

  Q & A > ICSE Board Exam : Class X Solved Question Papers Class 10 Sample / Model Papers for Download - Previous Years how does the asian dirt indicate in venue of war ? mention any 2 hardships experienced by the soldier Asked by: aswmgirl17

  Q & A > ICSE Board Exam : Class X Solved Question Papers Class 10 Sample / Model Papers for Download - Previous Years Can anybody advice me regarding the essay topics......on current affairs... Asked by: nirmithasreddy

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  Q & A > ICSE Board Exam : Class X Solved Question Papers Class 10 Sample / Model Papers for Download - Previous Years This custom prevailed upon the people . This custom prevails in the society. Am I right in both the cases? Asked by: anmj

  Q & A > ICSE Board Exam : Class X Solved Question Papers Class 10 Sample / Model Papers for Download - Previous Years I want to share a tip for maths For today that is Friday Read the book and all solved examples and solve them. Then for Saturday do three papers from past years . Make a level of scores And for Su Asked by: kushagra2014

  Q & A > ICSE Cu-----> Cu2+ +2e Is this example of oxidation or reduction? Asked by: cuuulboy

  Q & A > ICSE Board Exam : Class X Solved Question Papers Class 10 Sample / Model Papers for Download - Previous Years Now should I study history or English or physics or all three in these 5 days? Asked by: eldiablo0829

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  ICSE Class X Prelims 2025 : Physics (Smt. Sulochanadevi Singhania School, Thane)
  	The e.m.f of a cell depends on : (1) the material of the electrodes , (2) the electrolyte used in the cell chiku7459

  ICSE Class X Prelims 2025 : Physics (Smt. Sulochanadevi Singhania School, Thane)
  	51 is the CORRECT answer..likhvalo merese keshavtopper

  ICSE Class X Prelims 2023 : Economics (Walsingham House School, Mumbai)

  Public expenditure refers to the spending by government entities on various goods, services, and activities to fulfill public needs and promote economic growth. It includes all expenses incurred by federal, state, and local governments to run their operations and implement policies. Three economic objectives of public expenditure: 1. Economic growth: Government spending on infrastructure, education, and research can boost productivity and stimulate long-term economic growth. 2. Income redistribution: Public expenditure on social welfare programs and progressive taxation can help reduce income inequality and support disadvantaged groups. 3. Stabilization of the economy: Government spending can be used as a tool to manage economic cycles, increasing expenditure during recessions to stimulate demand and reducing it during periods of high inflation. Two non-economic objectives of public expenditure: 1. National security: Spending on defense and military capabilities to protect the country from external threats. 2. Social welfare: Expenditure on healthcare, education, and social services to improve the overall quality of life for citizens and promote social cohesion. aaamirie25

  CBSE Pre Board Class 10 2021 : Mathematics - Prelim 1 (Matushri Kashiben Vrajlal Valia International Vidyalaya (MKVV), Borivli, Mumbai)

  The given equation is: 9x² - 3(a + b)x + ab = 0 Using the quadratic formula: x = [-b ± √(b² - 4ac)] / (2a) Here, a = 9, b = -3(a + b), and c = ab x = [3(a + b) ± √(9(a + b)² - 36ab)] / 18 x = [3(a + b) ± √(9a² + 18ab + 9b² - 36ab)] / 18 x = [3(a + b) ± √(9a² - 18ab + 9b²)] / 18 x = [3(a + b) ± 3(a - b)] / 18 x = (a + b ± (a - b)) / 6 Therefore, the solutions are: x = (2a) / 6 = a / 3 x = (2b) / 6 = b / 3 vedaantm

  + 10 more by vedaantm  

  CBSE Pre Board Class 10 2021 : Mathematics - Prelim 1 (Matushri Kashiben Vrajlal Valia International Vidyalaya (MKVV), Borivli, Mumbai)
  	For the equations to have no solution, they must be parallel. This occurs when their slopes are equal but the y-intercepts are different. Slope of first equation: -2/3 Slope of second equation: -6/k For parallel lines: -2/3 = -6/k k = 9 Therefore, the equations have no solution when k = 9. vedaantm

  CBSE Pre Board Class 10 2021 : Mathematics - Prelim 1 (Matushri Kashiben Vrajlal Valia International Vidyalaya (MKVV), Borivli, Mumbai)
  	Steps to divide a line segment of 8 cm internally in the ratio 3:4: 1. Draw a line segment AB of length 8 cm. 2. From point A, draw a line at an angle (e.g., 30°). 3. On this line, mark 7 equal divisions (3 + 4 = 7). 4. Join the 3rd point from A to B. 5. The point where this line intersects AB is the required point of division. vedaantm

  CBSE Pre Board Class 10 2021 : Mathematics - Prelim 1 (Matushri Kashiben Vrajlal Valia International Vidyalaya (MKVV), Borivli, Mumbai)
  	Diameter of semi-circular protractor = 14 cm Radius = 14/2 = 7 cm Perimeter = Length of diameter + Length of semicircle = 14 + (1/2 × 2πr) = 14 + πr = 14 + π × 7 = 14 + 22 = 36 cm vedaantm

  CBSE Pre Board Class 10 2021 : Mathematics - Prelim 1 (Matushri Kashiben Vrajlal Valia International Vidyalaya (MKVV), Borivli, Mumbai)
  	The probability of getting a sum of 7 when two dice are thrown simultaneously is 1/6. Reasoning: There are 6 ways to get a sum of 7: (1,6), (2,5), (3,4), (4,3), (5,2), and (6,1). The total number of possible outcomes when throwing two dice is 6 × 6 = 36. Therefore, the probability is 6/36 = 1/6. vedaantm

  CBSE Pre Board Class 10 2021 : Mathematics - Prelim 1 (Matushri Kashiben Vrajlal Valia International Vidyalaya (MKVV), Borivli, Mumbai)
  	Given: α and β are zeros of x² - 5x + k, and α - β = 1 Using Vieta's formulas: α + β = 5 (sum of roots) αβ = k (product of roots) We know that (α - β)² = (α + β)² - 4αβ 1² = 5² - 4k 1 = 25 - 4k 4k = 24 k = 6 Therefore, the value of k is 6. vedaantm

  CBSE Pre Board Class 10 2021 : Mathematics - Prelim 1 (Matushri Kashiben Vrajlal Valia International Vidyalaya (MKVV), Borivli, Mumbai)
  	Area of a quadrant = (1/4) × πr² Circumference = 2πr = 44 cm r = 44 / (2π) = 7 cm Area of quadrant = (1/4) × π × 7² = (49π)/4 ≈ 38.48 cm² vedaantm

  CBSE Pre Board Class 10 2021 : Mathematics - Prelim 1 (Matushri Kashiben Vrajlal Valia International Vidyalaya (MKVV), Borivli, Mumbai)
  	Let a be the first term and d be the common difference of the A.P. 17th term = a + 16d 10th term = a + 9d Given: (a + 16d) - (a + 9d) = 7 16d - 9d = 7 7d = 7 d = 1 Therefore, the common difference is 1. vedaantm

  CBSE Pre Board Class 10 2021 : Mathematics - Prelim 1 (Matushri Kashiben Vrajlal Valia International Vidyalaya (MKVV), Borivli, Mumbai)
  	Given: 2p + 1, 13, 5p - 3 are consecutive terms of an A.P. Let a = 2p + 1, d be the common difference. Then, 13 = a + d and 5p - 3 = a + 2d 13 = (2p + 1) + d d = 12 - 2p 5p - 3 = (2p + 1) + 2(12 - 2p) 5p - 3 = 2p + 1 + 24 - 4p 5p - 3 = 25 - 2p 7p = 28 p = 4 Therefore, the value of p is 4. vedaantm

  CBSE Pre Board Class 10 2021 : Mathematics - Prelim 1 (Matushri Kashiben Vrajlal Valia International Vidyalaya (MKVV), Borivli, Mumbai)
  	The given pair of equations is consistent. To determine this, we compare the ratios of the coefficients: 3/6 = 4/8 = 5/10 = 1/2 Since all the ratios are equal, the equations are consistent, meaning they have at least one common solution. vedaantm

  CBSE Pre Board Class 10 2021 : Mathematics - Prelim 1 (Matushri Kashiben Vrajlal Valia International Vidyalaya (MKVV), Borivli, Mumbai)
  	To solve this, let's break it down step-by-step: 1) First, simplify the right side of the equation: sin 45° cos 45° + sin 30° We know that: sin 45° = cos 45° = 1/√2 sin 30° = 1/2 So, (1/√2) * (1/√2) + 1/2 = 1/2 + 1/2 = 1 2) Now our equation is: tan 3x = 1 3) We know that tan 45° = 1 4) Therefore: 3x = 45° 5) Solving for x: x = 45° / 3 = 15° Thus, the value of x is 15°. vedaantm

  1st National Certification Exam Energy Managers 2004 Paper 1

  c) coal Reasoning: Coal is the correct answer as it is a source of stored chemical energy. Coal is a fossil fuel that contains energy stored in chemical bonds formed over millions of years from decomposed plant matter. When coal is burned, these chemical bonds are broken, releasing the stored energy as heat. This process is used in power plants to generate electricity. Electricity (option a) is a form of energy, but it's not stored chemical energy. It's typically generated from other sources. Water (option b) doesn't inherently contain stored chemical energy. While it can be used in hydroelectric power, that's potential energy due to its position, not chemical energy. Compressed air (option d) contains potential energy due to pressure, not chemical energy. wrd1996

  Q & A > Muljibhai Mehta International School (MMIS)

  The difficulty of a Term 1 paper is subjective and depends on several factors, including: * **The student's preparation:** A well-prepared student will find the paper easier than a poorly prepared one. * **The specific subjects:** Some subjects are inherently more challenging than others. * **The individual's strengths and weaknesses:** A student might find certain topics easier than others, regardless of overall preparation. * **The marking scheme:** A lenient marking scheme can make a seemingly difficult paper appear easier. * **The teacher's expectations:** The difficulty of the paper might reflect the teacher's expectations for the class. Therefore, there's no single answer to whether the Term 1 paper is difficult. It's relative to the student and the context. To get a better understanding, you could ask classmates for their opinions, or review the paper yourself to assess its difficulty in relation to your own knowledge and understanding. james

  CBSE Class 10 Pre Board 2021 : Social Science (Smt Ramkuwar Devi Fomra Vivekananda Vidyalaya (SRDFVV), Chromepet, Chennai)

  The soil with the features described is Black soil, also known as Regur soil. Reasoning: 1. Found in Deccan trap region: Black soil is predominantly found in the Deccan Plateau region of India, which is known for its extensive lava flows. 2. Made up of Lava flows: Black soil is formed from the weathering of basaltic lava rocks. The Deccan Trap is a large igneous province composed of multiple layers of solidified flood basalt. Black soil is characterized by its dark color, high clay content, and excellent water retention capacity. It is highly fertile and suitable for growing crops like cotton, hence also known as "black cotton soil." mkjk

  Chapter 2.1 - Fuels and Combustion

  d) low excess air Reasoning: A high percentage of carbon monoxide (CO) in the flue gas of a boiler indicates incomplete combustion, which is typically caused by insufficient air supply or low excess air. When there's not enough oxygen available for complete combustion, carbon in the fuel doesn't fully oxidize to carbon dioxide (CO2) and instead forms carbon monoxide (CO). High excess air would result in more complete combustion and lower CO levels. Complete combustion would produce primarily CO2 rather than CO. Good control of pollutants would typically aim to minimize CO production. Therefore, the presence of high CO levels points to low excess air, which leads to incomplete combustion and higher CO formation. balamurali19

  + 6 more by balamurali19  

  Chapter 2.1 - Fuels and Combustion

  d) mix of fixed carbon and ash Reasoning: When analyzing the composition of coal in a laboratory, the sample is heated in an oven to drive off volatile matter. The volatile matter includes gases and liquids that are released when coal is heated, such as methane, hydrogen, and various hydrocarbons. After this process, what remains in the oven is not just ash, but a mixture of fixed carbon and ash. Fixed carbon is the solid combustible residue that remains after the volatile matter is driven off. It consists mainly of carbon, with small amounts of hydrogen, oxygen, nitrogen, and sulfur. Ash is the non-combustible mineral matter left after complete combustion. It includes various inorganic compounds like silica, alumina, iron oxide, and others. Options a), b), and c) are incorrect because: a) Sulphur is typically present in small amounts and would not be the only remaining component. b) Moisture would have been driven off during the heating process. c) Ash alone doesn't account for the fixed carbon content, which is a significant part of coal. Therefore, the correct answer is d) mix of fixed carbon and ash, as this accurately represents the solid content remaining after the volatile matter is distilled off in coal analysis. balamurali19

  Chapter 2.1 - Fuels and Combustion

  False Reasoning: The statement is false because it contains an error in terminology. The correct term is "proximate analysis" when referring to coal analysis, not "approximate analysis." Proximate analysis is a specific method used in coal characterization that determines the distribution of products obtained when coal is heated under specified conditions. It typically includes the measurement of moisture, volatile matter, fixed carbon, and ash content. The word "proximate" in this context does have a meaningful interpretation. It refers to the analysis being a close estimation or approximation of the coal's composition, providing important information about its properties and potential use, without conducting a full elemental analysis. The term "approximate" is not typically used in this specific coal analysis context and would be considered incorrect terminology in the field of coal science and engineering. balamurali19

  Chapter 2.1 - Fuels and Combustion

  c) maximum fuel input over minimum fuel input Reasoning: The turndown ratio for burners refers to the range of fuel input that a burner can effectively handle while maintaining stable combustion. It is calculated by dividing the maximum fuel input capacity by the minimum fuel input capacity. This ratio indicates the burner's flexibility in operating at different heat outputs. A higher turndown ratio means the burner can operate efficiently over a wider range of heat demands, which is important for energy efficiency and process control in various industrial applications. balamurali19

  Chapter 2.1 - Fuels and Combustion

  False. Reasoning: The statement is incorrect. Coal actually requires a higher percentage of excess air for efficient combustion compared to natural gas. Coal is a solid fuel with a complex composition, including various impurities. It requires more excess air to ensure complete combustion of all combustible components and to overcome mass transfer limitations. Typically, coal-fired boilers operate with 15-40% excess air. Natural gas, on the other hand, is a gaseous fuel that mixes more easily with air. It has a simpler chemical composition (primarily methane) and burns more completely with less excess air. Natural gas-fired systems typically operate with 10-15% excess air. The lower excess air requirement for natural gas contributes to its higher combustion efficiency compared to coal. This is one of the reasons why natural gas is considered a cleaner-burning fuel. balamurali19

  Chapter 2.1 - Fuels and Combustion

  a) lighter oil have higher specific heat Reasoning: In fuel oils, there is an inverse relationship between specific heat and specific gravity. Lighter oils have lower specific gravity (density) and higher specific heat capacity. This is because: 1. Lighter oils have smaller, less complex molecules, which can absorb and store more thermal energy per unit mass. 2. Heavier oils have larger, more complex molecules that are already more tightly bound, leaving less capacity to absorb additional thermal energy. 3. The specific heat of a substance is related to its molecular structure and bonds. Lighter oils with simpler structures tend to have more degrees of freedom for molecular motion, resulting in higher specific heat. 4. As the molecular weight increases (heavier oils), the specific heat generally decreases. This relationship is important in understanding the heating and cooling properties of different fuel oils in various applications, such as combustion engines and heating systems. balamurali19

  Chapter 2.1 - Fuels and Combustion

  b) LSHS (Low Sulphur Heavy Stock) Reasoning: Specific gravity is a measure of the density of a substance compared to the density of water. Among the given fuel options, LSHS typically has the highest specific gravity. This is because: 1. LSHS is a heavy residual fuel oil, which means it's composed of heavier hydrocarbons. 2. Furnace oil, while also a heavy fuel, generally has a slightly lower specific gravity than LSHS. 3. LDO (Light Diesel Oil) and HSD (High-Speed Diesel) are both distillate fuels with lower densities compared to residual fuels like LSHS and furnace oil. The specific gravity of these fuels typically follows this order (from highest to lowest): LSHS > Furnace Oil > LDO > HSD Therefore, LSHS has the highest specific gravity among the given options. balamurali19

  Chapter 3.1 - Electrical Systems

  c) 36 times Reasoning: The voltage drop in a power distribution system is inversely proportional to the square of the voltage. When the voltage is increased from 11 kV to 66 kV, we can calculate the factor by which the voltage drop will decrease: (66 kV / 11 kV)² = (6)² = 36 This means that by raising the distribution voltage from 11 kV to 66 kV, the voltage drop will be reduced by a factor of 36 times. Therefore, option c) 36 times is the correct answer. ajoy_menon

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