Questions

The 1950 Constitution had includeed 14 languages in the 8th Schedule. Sindhi was added seventeen years later, by the Constitution Act of 1967. Three more viz, Konkani, Nepali and Manipuri were added in 1992 by the 71st Amendment Act.

Relegate means Assigning an inferior rank or position to. That means, downgrading or pulling down, lower a person.

All other options have words with opposite in meaning.

Hence, Relegate is an English word which is similar in meaning to Downgrade.

Sodium hydroxide - NaOH is caustic soda

Sodium carbonate - Na2CO3 is washing soda

Sodium bicarbonate - NaHCO3  is baking soda 

Venus is the only planet that rotates in clockwise where all other planets in the solar system rotates in anti - clockwise direction.

Pluto dwells on the inner edge of the The Kuiper belt which is a belt of asteroids that lies on the outer edge of the solar system.

Pluto is a dwarf planet that is supposed to be no longer a planet and is still considered a planet because of its history in the solar system.

It takes 248 years to make one orbit around the sun. As to where it is, depends on time.