Questions

It returns -1

Galton's whistle is also called as Dogs whistle or silent whistle, is a type of whistle that emits sound in the ultrasonic range, which people cannot hear but some other animals can, including dogs and domestic cats, and is used in their training.

Arya Samaj was an Indian religious movement  based   on   Vedas  and was     founded     by     Dayananda Saraswati on April 7, 1875 and was based in Punjab and western Uttar Pradesh     states     like,     Aligarh, Varanasi, etc.  It  was  against  caste system  and  supported  equality  of men   and   women,moreover   it mainly    comprised    the    trading castes;    while    Brahmo    Samaj, founded  by  Raja  Rammohan  Roy, was limited because it was popular only   among   elite   and   educated society.

Can’t delete a row from primary table if there are related rows in secondary table.

silver is the best conductor of electricity.

When compared to remaining 3 metals, as Silver having more number of free electrons in its valency shell it is the good conductor of electricity.

Conductors Thermal Conductivity @ 25degree C

Silver --- 429
Copper --- 401
Gold --- 310
Aluminium --- 250