ANS:D - 3214

No answer description is available. 

ANS:D - Both A and B.

No answer description is available. Let's discuss.

ANS:C - elevations along a straight line

In this process, take rl at a constant distance of a straight line. Take rl at a constant distance of a stright line in this process.

ANS:B - Both A and R are true and R is not the correct explanation of A

No answer description is available.

ANS:A - Pachuka tank

Among the listed options, Packed towers are not typically used in liquid-liquid extraction. Liquid-liquid extraction, also known as solvent extraction or partitioning, is a separation process in which a solute is transferred from one immiscible liquid phase to another immiscible liquid phase. The equipment commonly used in liquid-liquid extraction includes:

1. Agitated vessels: These vessels facilitate the mixing of the two immiscible liquids to enhance mass transfer and extraction efficiency.
2. Centrifugal extractors: Also known as liquid-liquid centrifuges or decanters, these devices use centrifugal force to separate the two immiscible liquid phases based on their densities.
3. Pachuka tank: Pachuca tanks, or air agitated leach tanks, are primarily used in hydrometallurgical processes for leaching minerals from ores. They are not specifically associated with liquid-liquid extraction processes.

ANS:C - Logarithmic law

The velocity distribution in the turbulent boundary layer typically follows the logarithmic law.

Explanation:

1. Turbulent Boundary Layer:
   • In a turbulent boundary layer, which forms on a surface when a fluid flows over it, the velocity profile across the boundary layer is characterized by fluctuations and eddies (turbulence).
2. Logarithmic Law:
   • According to the logarithmic law (also known as the logarithmic velocity profile), the velocity U(y)U(y)U(y) at a distance yyy from the wall in the turbulent boundary layer can be expressed as: U(y)=uτκln⁡(yy0)+BU(y) = \frac{u_\tau}{\kappa} \ln\left(\frac{y}{y_0}\right) + BU(y)=κuτ​​ln(y0​y​)+B where:
     • uτu_\tauuτ​ is the shear velocity,
     • κ\kappaκ is the von Kármán constant (approximately 0.41),
     • yyy is the distance from the wall,
     • y0y_0y0​ is the roughness length or displacement thickness,
     • BBB is a constant.
3. Other Laws:
   • Parabolic Law: This describes the velocity profile in laminar flow, where the velocity distribution is parabolic across the boundary layer. It is not applicable to turbulent flow.
   • Linear Law: This describes the velocity profile in very thin viscous sub-layers near the wall in turbulent flow, where velocity varies linearly with distance from the wall. It does not describe the overall velocity distribution across the turbulent boundary layer.
   • None of These: While the parabolic and linear laws apply to specific flow conditions, they do not describe the velocity distribution in a turbulent boundary layer.

Conclusion:

ANS:A - Varanasi

Prime Minister Modi laid the foundation stone of an international cricket stadium in Varanasi, his Lok Sabha constituency, during his visit to the city.

ANS:D - Delhi

The 14th edition of the Global Skills Summit is being held in Delhi, India. The two-day Summit began on September 22, 2023, and focuses on the theme of building skills, empowering youth, and creating a future. The Summit aims to create a road map for a high-quality industry-led skilling ecosystem in India.

ANS:B - New Delhi

The 10th meeting of the India-Malaysia Joint Sub-Committee on Defence Science, Technology and Industry Cooperation was held in New Delhi on September 18, 2023. During the meeting, the existing defence research and industry cooperation between the two countries was reviewed. Discussions were also held on issues of mutual interest.

ANS:A - King Fahd International Airport (DMM)

The largest airport in the world by size and area is King Fahd International Airport (DMM), located in Dammam, Saudi Arabia. It spans over 776 square kilometres (299.61 square miles), which is approximately the same size as New York City, including its five boroughs. King Fahd International Airport is a major hub for Saudi Arabian Airlines and is one of the busiest airports in the Middle East. It handles over 20 million passengers and 700,000 tons of cargo each year.