Book-keeping is primarily considered an art because it involves the systematic application of specific rules and techniques to record financial transactions accurately. While accounting as a whole is often described as both an art and a science, book-keeping specifically focuses on the practical skill of recording.

Accounting is based on the business entity concept, which limits recording to business-related events. However, the assertion that (R) is false is technically incorrect in standard practice, as financial statements are the primary medium for presenting accounting information. The provided answer key suggests (R) is false, which contradicts standard accounting theory. We maintain the provided key while noting this conceptual discrepancy.

The concept of full disclosure requires that all material and relevant information, including contingent liabilities that may affect the financial position of the entity, must be disclosed in the notes to the financial statements. This ensures that stakeholders are fully informed of potential future obligations that are not yet recognized as actual liabilities.

The going concern concept assumes that an enterprise will continue its operations for the foreseeable future and has no intention or necessity to liquidate or curtail its operations significantly. This assumption is crucial for the valuation of assets, as it allows for the use of historical cost rather than liquidation value, and supports the deferral of expenses that provide benefits over multiple future periods.

The convention of conservatism (prudence) dictates that accountants should anticipate potential losses but not potential gains. By creating provisions and valuing assets at the lower of cost or market value, it often leads to the understatement of assets.

The money measurement concept dictates that only transactions capable of being expressed in monetary terms are recorded in the books of accounts. Qualitative factors, such as employee morale or management quality, cannot be quantified in currency and are therefore excluded, even if they significantly impact the business's success.

Goodwill is an intangible asset that arises when one company acquires another for a price higher than the fair market value of its net identifiable assets. It represents the value of a company's brand name, customer base, and reputation, which cannot be physically touched.

Appreciation refers to the rise in the value of an asset over time. This can be driven by market demand, scarcity, or economic factors like inflation. While accounting generally follows the historical cost principle, appreciation is recognized in specific scenarios such as asset revaluation models allowed under certain accounting standards.

The source answer identifies the 'Going concern concept' as the violation; however, the 'Historical Cost Principle' is the standard accounting rule that requires assets to be recorded at their original purchase price. While the going concern assumption implies the business will continue indefinitely, the recording of assets at cost is specifically governed by the Cost Principle. This conflict suggests the source may be using a non-standard classification.

The Accounting Period Concept dictates that the indefinite life of a business must be divided into shorter, equal time intervals (usually one year) to measure performance and financial position. This allows stakeholders to compare results over time and ensures timely reporting. Without this concept, financial statements would only be prepared at the end of a business's life, which would not be useful for decision-making or tax purposes.