ANS:C - White

Explanation: All except White are colours of the' rainbow.

ANS:A - 4 V

V = J/C. V = 60/15, V = 4v.

ANS:B - egg shaped

The suitable cross-section of sewers to carry combined flow (both sanitary sewage and stormwater) often depends on various factors including flow characteristics, sediment transport, self-cleaning ability, and hydraulic efficiency. Among the options provided:

• Circular: Circular sewers are commonly used for combined flow because they provide good hydraulic performance, self-cleaning action due to the circular shape, and efficient flow conveyance. They are particularly effective in transporting both sanitary sewage and stormwater.
• Egg shaped: Egg-shaped sewers are also used for combined flow. They offer advantages such as self-cleaning ability, improved sediment transport, and reduced flow velocity during low-flow conditions. However, they may be more costly to construct compared to circular sewers.
• Rectangular: Rectangular sewers are less common for combined flow but can be suitable in certain situations, such as in urban areas with limited space for sewer installation. They may provide good flow capacity but may require more maintenance to prevent sediment accumulation.
• Horse shoe shaped: Horse shoe-shaped sewers, or semi-circular sewers, are sometimes used for combined flow. They offer advantages similar to circular sewers in terms of hydraulic efficiency and self-cleaning ability.

ANS:D - 12

2¹² = 4096.

ANS:C - 1160

To find the mass of butane formed by the liquefaction of 448 liters of gas measured at STP (standard temperature and pressure), we need to consider the molar volume of the gas at STP. At STP, 1 mole of any ideal gas occupies approximately 22.4 liters. Given that the gas is butane (𝐶4𝐻10C4​H10​), we need to calculate the number of moles of butane formed from the given volume: Volume of gas=448 litersVolume of gas=448liters Molar volume at STP=22.4 liters/molMolar volume at STP=22.4liters/mol Number of moles of butane=Volume of gasMolar volume at STPNumber of moles of butane=Molar volume at STPVolume of gas​ Number of moles of butane=448 liters22.4 liters/molNumber of moles of butane=22.4liters/mol448liters​ Number of moles of butane=20 molesNumber of moles of butane=20moles Now, we need to find the molar mass of butane (𝐶4𝐻10C4​H10​): Molar mass of 𝐶4𝐻10=4×molar mass of 𝐶+10×molar mass of 𝐻Molar mass of C4​H10​=4×molar mass of C+10×molar mass of H Molar mass of 𝐶4𝐻10=4×12.01 g/mol+10×1.01 g/molMolar mass of C4​H10​=4×12.01g/mol+10×1.01g/mol Molar mass of 𝐶4𝐻10=48.04 g/mol+10.1 g/molMolar mass of C4​H10​=48.04g/mol+10.1g/mol Molar mass of 𝐶4𝐻10=58.14 g/molMolar mass of C4​H10​=58.14g/mol Now, to find the mass of butane formed: Mass of butane=Number of moles of butane×Molar mass of 𝐶4𝐻10Mass of butane=Number of moles of butane×Molar mass of C4​H10​ Mass of butane=20 moles×58.14 g/molMass of butane=20moles×58.14g/mol Mass of butane=1162.8 gMass of butane=1162.8g So, the mass of butane formed by the liquefaction of 448 liters of the gas measured at STP would be approximately 1162.8 grams. Therefore, the closest answer to 1162.8 grams from the given options is 1160 grams.

ANS:C - Arun Alagappan

Arun Alagappan has been appointed and re-designated as the Executive Chairman of Coromandel International Ltd. (CIL). This leadership transition follows the retirement of A. Vellayan, the outgoing Chairman and Non-Executive Director. Alagappan's appointment signifies a significant change in the company's leadership structure, reflecting ongoing strategic shifts and continuity in leadership guidance.

ANS:C - Shooting

Sarabjot Singh, an Indian athlete, won the gold medal in the men's 10m Air Pistol event at the ISSF Rifle & Pistol World Cup.