Questions

Bhagat Singh and B.K. Dutt threw bombs in the Legislative Assembly as a protest against "Passage of public Safety bill".

Water can moderate temperature because of the two properties: high-specific heat and the high heat of vaporization. 

Hence, all the above given options are not the properties of water.

Apple briefly touched $800 billion market valuation, making it the world's first ever company to hit the milestone. At $800 billion, Apple's valuation was higher than the combined market cap of all the 30 Sensex companies, which stood at $784 billion. The world's most valuable company, Apple is followed by Google parent Alphabet, and Microsoft in market valuation.

It is Blackboard or Chalkboard which is Black when clean, and as you write on it with white chalk it becomes dirty in White color.

Punjab