Which of the following substances is a bad conductor of

Which number will replace the question mark (?) in the following number series?

  5, 4, 6, 15, 56, ?

How many right angled triangles can be made from the given shape?

A is the son-in-law of B, whose son is D. D is the brother of C, whose only daughter is E. How is C related to A? 

This question is based on the five, three-digit numbers given below.

'A × B' का अर्थ है 'A, B का पति है' 

'A + B' का अर्थ है 'A, B का भाई है' 

Which diagram correctly represents the relationship of pigeons, birds, dogs?

Statements:

1. Some mammals are animals.

2. All animals are birds.

Conclusions:

1. All birds are animals.

Question: Among 6 trees, A, B, C, D, E and F each having a different height, which tree is the third tallest?

Statement: