ANS:C - Polyandry

No answer description is available. 

ANS:C - Both 1 and 2 are correct.

No answer description is available. Let's discuss.

ANS:B - Angles from two transit stations

No answer description is available.

ANS:D - R_i = R_L

No answer description is available.

ANS:D - Packed

The correct answer is packed column. In gas absorption processes, packed columns are commonly used. These columns are filled with packing materials such as rings, saddles, or structured packing. The packing provides a large surface area for intimate contact between the gas phase containing the solute to be absorbed and the liquid phase (absorbent). This facilitates the transfer of the solute from the gas phase to the liquid phase, resulting in efficient absorption.

ANS:D - ∞

For an ideal fluid flow, the Reynolds number (ReReRe) is 0. Here’s why:

• Ideal Fluid Flow: An ideal fluid is an imaginary fluid that is inviscid (zero viscosity) and incompressible (constant density). In such a fluid, there are no shear forces between layers of fluid, and thus, no viscosity effects are present.
• Reynolds Number Definition: The Reynolds number (ReReRe) is defined as: Re=ρVLμRe = \frac{\rho V L}{\mu}Re=μρVL​ where:
  • ρ\rhoρ is the density of the fluid,
  • VVV is the characteristic velocity of the flow,
  • LLL is a characteristic length (such as the diameter of a pipe),
  • μ\muμ is the dynamic viscosity of the fluid.
• Ideal Fluid Characteristics: In an ideal fluid where viscosity (μ\muμ) is zero, the Reynolds number becomes: Re=ρVL0=∞Re = \frac{\rho V L}{0} = \inftyRe=0ρVL​=∞ This indicates that in ideal fluid flow, the Reynolds number tends towards infinity because there is no viscous resistance to flow.

ANS:A - freeze drying

Common salt is generally not produced commonly by electrolytic method from brine. Common salt is generally not produced commonly by the electrolytic method from brine because:

Electrolytic Method Overview:

1. Process: The electrolytic method involves passing an electric current through brine (a concentrated solution of sodium chloride), leading to the electrolysis of sodium chloride into its components.
2. Products: This method produces sodium hydroxide (NaOH), chlorine gas (Cl₂), and hydrogen gas (H₂) as the primary products, rather than just sodium chloride (common salt).

Reasons for Not Using Electrolysis for Common Salt Production:

1. Complexity and Cost: The electrolytic process is more complex and expensive compared to other methods, making it less viable for the straightforward production of common salt.
2. Desired Product: The main goal of producing common salt is to obtain pure sodium chloride, whereas electrolysis yields additional products that may not be desirable for salt production.
3. Alternative Methods: More efficient and cost-effective methods for producing common salt include:
   • Solar Evaporation: Utilizing sunlight to evaporate water from seawater or brine, leaving behind crystallized salt.
   • Vacuum Evaporation: Evaporating water under reduced pressure to obtain salt crystals.

Summary:

ANS:D - Mumbai

India's first 'Migration Monitoring System' has been inaugurated in Mumbai. The system has been developed by the Department of Women and Child Development.

ANS:B - Alkyl benzene sulphonate (ABS)

Alkyl benzene sulphonate (ABS) is a detergent. Alkyl benzene sulphonate (ABS) is a detergent due to its chemical structure and properties that make it effective in cleaning applications. Here’s an explanation:

Structure and Composition:

1. Chemical Structure: ABS consists of a long hydrophobic alkyl chain attached to a benzene ring, which is further sulfonated to create a hydrophilic sulfonate group. This dual nature makes it an ideal surfactant.
2. Surfactant Properties: The hydrophobic (water-repelling) tail interacts with oils and dirt, while the hydrophilic (water-attracting) head interacts with water, allowing the detergent to effectively emulsify and remove stains.

Functionality:

1. Cleaning Action: When ABS is used in cleaning products, it reduces the surface tension of water, allowing it to spread and penetrate surfaces more easily. This helps in lifting and removing dirt and grease.
2. Foaming Ability: ABS produces foam, which enhances its cleaning action and improves the user experience in products like laundry detergents and dishwashing liquids.

Applications:

1. Household Cleaners: ABS is commonly found in household cleaning products, including laundry detergents, dishwashing liquids, and surface cleaners.
2. Industrial Uses: It is also used in various industrial applications where effective cleaning agents are required, such as in textile and leather processing.

Advantages of ABS:

• Biodegradable: Many formulations of ABS are designed to be biodegradable, making them environmentally friendly options compared to some other surfactants.
• Effective in Hard Water: ABS performs well in hard water conditions, maintaining its cleaning efficacy despite the presence of calcium and magnesium ions.

Summary:

ANS:B - HAL

Prime Minister Narendra Modi unveiled HTT-40, an indigenous trainer aircraft designed and developed by Hindustan Aeronautics Limited (HAL).