ANS:D - 2431

No answer description is available. 

ANS:C - ?:

No answer description is available. Let's discuss.

ANS:C - range and period of oscillation both vary

The magnetic meridian swings like a pendulum. It swings in one direction for a long time (100 to 200 years) and gradually comes to rest and then swings in the opposite direction.

The change produced annually by secular variation amounts in different places from 0 to 12 minutes (Period) but does not remain constant at any place.

ANS:C - -45°

No answer description is available.

ANS:B - gas

In the absorption process, ammonia gas is being dissolved into water. The liquid phase refers to the water into which the ammonia gas is being absorbed. The absorption process involves the transfer of the gas (ammonia) from the gas phase (the environment) into the liquid phase (the water). The resistance to this transfer occurs primarily within the liquid phase. Factors such as the solubility of ammonia in water, the surface area available for contact between the gas and liquid phases, the concentration gradient of ammonia between the gas and liquid phases, and the mass transfer coefficient (which characterizes the rate of mass transfer between phases) all contribute to the resistance encountered in the liquid phase during absorption. In summary, the liquid phase plays a significant role in determining how effectively ammonia gas is absorbed into water, making it the main resistance to absorption in this process.

ANS:A - C_v . 2gH

The actual velocity at the vena contracta (the point where the cross-sectional area of flow is the smallest downstream of an orifice) for flow through an orifice from a reservoir is given by: Cd2gHC_d \sqrt{2gH}Cd​2gH​ where:

• CdC_dCd​ is the discharge coefficient of the orifice,
• ggg is the acceleration due to gravity,
• HHH is the height of fluid above the center of the orifice.

Explanation:

1. Discharge Coefficient (CdC_dCd​):
   • The discharge coefficient CdC_dCd​ accounts for losses due to friction, contraction, and other factors affecting the flow through the orifice. It is dimensionless and typically less than 1.
   • CdC_dCd​ is determined experimentally and varies with the shape and size of the orifice.
2. Velocity Calculation:
   • The velocity at the vena contracta can be derived using Bernoulli's equation, taking into account the pressure difference between the reservoir and the orifice exit.
   • For an orifice, the velocity can be expressed as 2gH\sqrt{2gH}2gH​, where HHH is the height of the fluid column above the orifice.
3. Relationship:
   • The actual velocity VVV at the vena contracta is related to the discharge coefficient CdC_dCd​ and the square root of the head HHH: V=Cd2gHV = C_d \sqrt{2gH}V=Cd​2gH​
   • This formula accounts for the effective area of flow at the vena contracta, which is typically smaller than the area of the orifice due to contraction effects.

Conclusion:

ANS:C - Jaipur

President Murmu inaugurated Samvidhan Udyan in Jaipur.

ANS:D - Hyderabad

Hyderabad is to become India's first city with 100% sewerage facilities by May 2023.

ANS:D - Rajnath Singh

Defence minister Rajnath Singh inaugurated steel arch Siyom Bridge.

ANS:C - Srinagar

CRPF celebrated Jashn-e-Chillai-Kalan' with students in Srinagar.