When Hydrogen starts burning in air it

The probability a red marble selected at a random from a Jar containing p red, q blue and "r” green marbles is

Pointing to a girl, Akash said, “She is the daughter of the only child of my grandmother.” How is that girl related to Akash? 

From the given options, select the alphanumeric group which will come in place of the question mark (?) in the following series. 

Based on the following information, which of the following means that S is the maternal grandfather of T?  

Select the number from the given options which will come in place of the question mark (?) in the following series. 

15, 16, 18, 21, 25, ?

If the following words are arranged according to their order in the English dictionary, which of the following words will come last? 

Answer the question given below on the basis of the given number and symbol series. 

(Left) 3% $ 7 2 5 $ 1 & 6 # * 3 9 ! 4 3 @ S 8 (right) 

A student can type 21 pages in 15 minutes. At the same rate, how long will it take the student to type 84 pages?

The teacher was extremely angry on the boys who had thrown stones at the dogs.