Which is faster, Heat or Cold ? Explain.

Living above a star, I do not burn
Eleven friends and they do not turn
I can just be visited in a sequence, not once or repeatedly
PQRS are my initials
Can you tell my name accurately?

I look at you, you look at me, I raise my right, you raise your left. What am I?

Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?

Which of the following words don't belong in the group and why?
CORSET, COSTER, SECTOR, ESCORT, COURTS

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

I have nine bottles of wine and one of the nine bottles is poisoned.
I need to find the poisoned bottle with two facts
(1) Poison is deadly, only a sip will cost death
(2) I have two mice to do so.

How should I do it?

What has 13 hearts but no other organs?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?