ANS:E - Mercury

Explanation: Mercury is the only liquid metal in the group.

ANS:A - ampere

Coulomb refers to the amount of charge stored in a conductor, the symbol of charge (q) is expressed by Coulomb.

ANS:D - all of these.

Sewer manholes are essential components of sewer systems and are strategically placed at various points along the network to facilitate maintenance, inspection, and access to the sewer lines. Let's explore the reasons why sewer manholes are generally provided at the following locations:

1. At the Change of Gradient: Sewer manholes are often installed at points where there is a significant change in the gradient or slope of the sewer line. Changes in gradient can affect the flow velocity and direction of wastewater within the sewer pipe. By placing manholes at these points, engineers can access the sewer line to inspect and maintain the integrity of the pipe, ensure proper flow conditions, and address any blockages or buildup of debris that may occur due to changes in slope.
2. At the Change of Direction: Manholes are also commonly installed at locations where there is a change in the direction of the sewer line, such as bends, curves, or intersections. Changes in direction can impact the flow dynamics and hydraulic performance of the sewer system. Manholes provide access points for inspection and maintenance activities, allowing engineers to monitor the condition of the sewer lines, remove obstructions, and perform repairs if necessary. Additionally, manholes at change-of-direction points facilitate the flushing of sediment and debris that may accumulate in the pipes, helping to maintain the overall efficiency of the sewer network.
3. At the Junctions of Sewers: Junctions, where multiple sewer lines converge or intersect, are critical points in the sewer network. Manholes are typically installed at these junctions to facilitate the connection and branching of sewer lines. These manholes serve as access points for inspecting and maintaining the junction structure, ensuring proper alignment and sealing of the pipes, and preventing infiltration or exfiltration of groundwater or surface water. Additionally, manholes at sewer junctions allow for the installation of flow control devices, such as valves or gates, to regulate the flow of wastewater within the network and prevent overloading or surcharging of the system during heavy rainfall events.

ANS:B - False

Other gates are also available.

ANS:D -

The Maxwell relation derived from the differential expression for the Helmholtz free energy (𝑑𝐴dA) relates the second derivative of the Helmholtz free energy with respect to two different thermodynamic variables. It can be expressed as: (∂2𝐴∂𝑋∂𝑌)𝑇=−(∂2𝐴∂𝑌∂𝑋)𝑇(∂X∂Y∂2A​)T​=−(∂Y∂X∂2A​)T​ Where:

• 𝐴A is the Helmholtz free energy.
• 𝑋X and 𝑌Y are two thermodynamic variables (e.g., pressure 𝑃P, volume 𝑉V, temperature 𝑇T, etc.).
• 𝑇T is the temperature.

ANS:B - New Delhi

The Indian Army conducted a tabletop exercise at the Manekshaw Centre in New Delhi from December 4 to 8, as part of joint military training initiatives with ASEAN member states, affirming a commitment to gender inclusivity and enhancing the capabilities of women in military roles.

ANS:D - Russia

Members of the G7 have agreed to impose a price cap on Russian oil in a bid to hit Moscow's ability to finance the war in Ukraine.