ANS:D - On tenterhooks

No answer description is available. 

ANS:B - Only 2 is correct.

No answer description is available. Let's discuss.

ANS:E - all the above.

No answer description is available.

ANS:C - 3075 m

Thanks @Anjila Bhatta.

ANS:C - causal system

No answer description is available.

ANS:C - Re^0.83

For turbulent mass transfer in pipes, the Sherwood number (𝑆ℎSh) is typically correlated with the Reynolds number (𝑅𝑒Re) and the Schmidt number (𝑆𝑐Sc) using empirical relationships. The most commonly used relationship is: 𝑆ℎ=𝐶⋅𝑅𝑒𝑚⋅𝑆𝑐𝑛Sh=C⋅Rem⋅Scn where 𝐶C, 𝑚m, and 𝑛n are constants that depend on the specific flow conditions and geometry of the system. For mass transfer in fully turbulent flow in pipes, the Sherwood number is often correlated with the Reynolds number raised to a power of approximately 0.83. Therefore, the Sherwood number depends on the Reynolds number as: 𝑅𝑒0.83Re0.83 So, the correct option is Re0.83.

ANS:A - h₁ > h₂ < h₃

In a venturi meter, which is used to measure fluid flow rate, the correct relationships among heads (pressure heads or static pressures) at points X, Y, and Z are typically represented as: h1 > h2 < h3 Here's an explanation for each point:

• h1: Represents the pressure head (or static pressure) at the entrance of the venturi meter (point X). This is typically higher than the pressure head at the throat (point Y), denoted as h2.
• h2: Represents the pressure head (or static pressure) at the throat of the venturi meter (point Y). Due to the principle of conservation of energy (Bernoulli's principle), the pressure head at the throat is lower than at the entrance because of the increase in fluid velocity at the throat.
• h3: Represents the pressure head (or static pressure) at the exit of the venturi meter (point Z). This is typically lower than the pressure head at the throat (h2) due to the recovery of pressure after the constriction.

ANS:A - plaster of paris

Calcination of gypsum produces plaster of Paris for several reasons:

1. Chemical Process:

• Heating Reaction: When gypsum (calcium sulfate dihydrate, CaSO₄·2H₂O) is heated to about 150-180 °C, it undergoes calcination, losing water to form calcium sulfate hemihydrate (CaSO₄·½H₂O), known as plaster of Paris.

2. Water Loss:

• Dehydration: The process involves the removal of two water molecules from the gypsum structure, leading to a powdery form that can rehydrate easily.

3. Rehydration Properties:

• Setting Ability: Plaster of Paris can be mixed with water to form a paste that sets quickly upon hardening, making it useful for casting molds, making sculptures, and in construction applications.

4. Versatile Applications:

• Construction and Art: It is widely used in construction for making decorative elements, as well as in art for creating sculptures and molds due to its smooth finish and ease of use.

5. Temperature Control:

• Controlled Calcination: The process is carefully controlled to ensure the proper formation of plaster of Paris without converting it into anhydrite (CaSO₄) by excessive heating.

Summary:

ANS:B - Dr Jitendra Singh

Union Minister Dr. Jitendra Singh has launched the Dashboard of the Department of Science and Technology (DST).

ANS:C - Ministry of Chemicals and Fertilisers

Under the Pradhan Mantri Bhartiya Janaushadhi Pariyojana, more than 8,700 Pradhan Mantri Bhartiya Janaushadhi Kendras have been opened across the country. It is implemented by the Ministry of Chemicals and Fertilisers.