| Column I | Column II | ||
| (A). | Biodegradable | (P). | Polyacrylonitrie |
| (B). | Synthetic | (Q). | PHBV |
| (C). | Natural | (R). | Dacron |
| (D). | Polyester | (S). | Rubber |
Match the terms in Column-I with their description in Column-II and choose the correct option: Column I Column II (A). Biodegradable (P). Polyacrylonitrile (B). Synthetic (Q). PHBV (C). Natural (R). Dacron (D). Polyester (S). Rubber
Solution: * (A). Biodegradable matches with (Q). PHBV. * (B). Synthetic matches with (P). Polyacrylonitrile and (R). Dacron. * (C). Natural matches with (S). Rubber. * (D). Polyester matches with (R). Dacron. Therefore, the correct matching is: * A - Q * B - P, R * C - S * D - R

In the given figure, the blocks $A$, $B$ and $C$ weigh $4\,\text{kg}$, $6\,\text{kg}$ and $8\,\text{kg}$ respectively. The coefficient of sliding friction between any two surfaces is $0.5$. The force $\vec{F}$ required to slide the block $C$ with constant speed is ___ N.
(Given: $g = 10\,\text{m s}^{-2}$) 
The equivalent resistance between the points \(A\) and \(B\) in the given circuit is \[ \frac{x}{5}\,\Omega. \] Find the value of \(x\). 
Method used for separation of mixture of products (B and C) obtained in the following reaction is: 
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