Quantitative Aptitude - Arithmetic Ability Questions

Which of the following option is CORRECT about the figure shown below?

The radius of a sphere and right circular cylinder is 'r'. Their volumes are equal. The ratio of the height and radius of the cylinder is:

The ratio of angles of a triangle are 1 : 2/3 : 3. Then the smallest angle is

Convert decimal 99 to binary.

What is the mean of first hundred natural numbers?

Pipes A and C can fill an empty cistern in 32 and 48 hrs, respectively while Pipe B can drain the filled cistern in 24hrs. If the three pipes are turned on together when the cistern is empty, how many hrs will it take for the cistern to be 2/3 full?

What is the sum of the first 11 terms of an arithmetic progression if the 4th term is 11 and the 7th term is -4?

One of the roots of the equation x2 - 4x + k = 0 is x = 3. The other root is