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A piano is a musical instrument which has keys, pedals and strings in which the strings are struck by hammers.

Generally Accepted Accounting Principles (GAAP) are basic accounting principles and guidelines are concepts that govern the field of accounting.

Accounting principles and guidelines include :

* Business Entity Assumption

* Accounting Period

* Historical Cost Concept

* Full Disclosure Principle

* Cost Principle

* Matching Principle

* Materiality

* Monetary Unit Assumption.

The substances in which two or more atoms are attached together are called as molecular substances. 

Properties of molecular substances ::

1. Molecular substances are bonded with covalent bonds

2. Bad heat conductivity

3. Bad electrical conductivity

4. Have low melting points.

Auto-immune disease :: Sometimes, due to genetic and other unknown reasons, the body attack self-cells. This results in damage to the body and is called auto-immune disease.

From the options,

-> Rheumatoid arthritis is an autoimmune disorder in which antibodies are produced against the synovial membrane and cartilage.

-> Vitiligo causes white patches on skin also characterised as autoimmune disorder.

-> Psoriasis is a skin disease that causes itchy or sore patches of thick red skin and is also autoimmune.

-> Alzheimer's disease is a chronic neurodegenerative disease. Alzheimer's disease is due to deficiency of neurotransmitter acetylcholine.

Hence, Alzheimer's is not the auto-immune disease.

Vitamins are indispensable for the maintenance of optimal health is the only statement that is true about vitamins.

Allahabad is known as the City of Prime Ministers because seven out of 15 prime ministers of India since independence have connections to Allahabad(Jawaharlal Nehru, Lal Bahadur Shastri, Indira Gandhi, Rajiv Gandhi, Gulzarilal Nanda, Vishwanath Pratap Singh and Chandra Shekhar).

Teressa Island is located in Andaman & Nicobar of India.