Questions

Sound is a kind of energy created when something vibrates. When this vibration reaches an ear, it is translated into what we recognize as a sound. Sound vibration must travel through matter. Therefore, it can travel through air and water but not through vacuum.

According to al-Biruni, the sufi theories of the soul were similar to those in Patanjali’s Yoga Sutra. Like the Yoga Sutra, sufi works also stated that ‘the bodies are the snares of the souls for the purpose of acquiring recompense’. Al-Biruni also identifies the sufi doctrine of divine love as self-annihilation with parallel passages from the Bhagavad Gita. There was also much exchange of ideas between the Sufis and Indian yogis. In fact the hatha-yoga treatise Amrita Kunda was translated into Arabic and Persian, So C is right.

Hujwiri was known as Datta Ganj Baksh. Hujwiri comments that before he settled in Lahore some sufis believed in theories that he calls brahmanical. According to Hujwiri they wrongly believed that ‘annihilation (fand’) signifies loss of essence and destruction of the personality, and that subsistence (baqa) indicates the subsistence of God in man.

The point or place of origin of an earthquake is called Focus. 

And,

The point where the seismic waves reach the surface is called as Epicenter.

The general properties of acids are as follows :-

1.They are sour to taste.

2.They turn blue litmus paper red but the red litmus paper have no effect of acids and it remains unaffected.

3.They release hydrogen ions H+ in the solution medium, making the conditions acidic.