I have branches, but no fruit, trunk or leaves. What am I?

Suppose you are sitting in an interview and the interviewee asks you an aptitude question.

You have three buckets with a capacity of 4 litres, 8 litres and 10 litres and you have a large tank of water. Now you have to measure 3 litres of water precisely using those buckets. How will you do it?

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

Solve the counting riddle by identifying the number of triangles in the given picture.

What word begins and ends with an E, but has only one letter?

It belongs to you, but other people use it more than you do. What is it?

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?

Which digit occurred maximum times between the number 1 and 1000?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?