Step 1: Understanding the Concept:
This question is about the classification of resources based on their availability, accessibility, and the technology to utilize them.
Step 3: Detailed Explanation:
\[\begin{array}{rl} \bullet & \text{(D) Actual resources: These are resources that have been surveyed, their quantity and quality determined, and are currently being used.} \\ \bullet & \text{(B) Potential resources: These are resources that exist in a region and could be used in the future, but are not yet fully utilized, perhaps due to economic inviability. We have the technology but are not using them yet.} \\ \bullet & \text{(C) Stock resources: These are resources that are known to exist but cannot be used because we do not have the appropriate technology to harness them. For example, extracting hydrogen and oxygen from water (H\(_2\)O) on a large scale for energy is currently technologically not advanced enough, so water can be considered a stock resource for this purpose.} \\ \bullet & \text{(A) Reserve resources: These are a subset of stock resources that can be put into use with the help of existing technology but are deliberately kept for future needs.} \\ \end{array}\]
The question specifically mentions a "lack of technology" as the reason for non-exploration, which is the definition of stock resources.
Step 4: Final Answer:
Resources available but not explored due to a lack of technology are referred to as stock resources.
Consider a Pelton wheel of 1 m diameter. The magnitude of relative velocity of water at the bucket inlet is the same as the magnitude of relative velocity of water at the bucket exit. The absolute speed of water at the bucket inlet is 125.66 m/s\(^{-1}\). For maximum power output from the Pelton wheel, the rpm of the Pelton wheel is (rounded off to 1 decimal place).
A simply supported beam of length 1 m is subjected to a uniformly distributed bending moment of 1 N m per meter throughout the length as shown in the figure. The bending moment at the mid-point of the beam is __________ N m (rounded off to the nearest integer).

Cylindrical workpieces of diameter 60 mm and length 400 mm are machined on a lathe at a cutting speed of 25 m/min and a feed of 0.2 mm/rev. The Taylor’s tool life parameters \(C\) and \(n\) for this setup are 75 and 0.25, respectively. The tool changing time is 3 minutes. With a labor and overhead cost of ₹5 per minute, the tool changing cost per piece is ₹_________ (rounded off to 2 decimal places).
A company uses 3000 units of a part annually. The units are priced as given in the table below. It costs ₹150 to place an order. Carrying costs are 40 percent of the purchase price per unit on an annual basis. The minimum total annual cost is ₹ _________ (rounded off to 1 decimal place).

A project involves eight activities with the precedence relationship and duration as shown in the table below. The slack for the activity D is __________ hours (answer in integer).
