Which of the following substances are ozone-depleting?

Select the correct answer from the code given below.

                I.         Chlorofluorocarbons

             II.         Halones

            III.         Carbon tetrachloride

           IV.         Hydrochlorofluorocarbon

Lightning is seen before thunder because

If * is an operation such that a * b = 3a – 4b. find the value of 3*4

Global warming is believed to be due to:

Five rods are kept in a line such that any of the rods is thrice the length of the previous one. The average length of the rods is about

40% of an amount is Rs 55. 160% of the same amount will be 

Under the Article 148, the Comptroller and Auditor General of India shall be appointed by:    

The six freedoms in Article 19 can be curtailed by:

Which one of the following rivers is also known as the ‘sorrow of Benagal’?