Which is faster, Heat or Cold ? Explain.

Solve below rebus puzzle?

I am quite hot but become too cold if you remove the first two letters. What am I?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Given below is simple addition with a defined pattern pattern:
7 + 7 = 2
8 + 8 = 4
8 + 5 = 1
6 + 9 = 3
10 + 11 = 9

Can you analyze the pattern and find out the answer for:

4 + 9 = ?

what one word does the below rebus identifies?

Why do people go to bed?

John speaks the truth only once a day in a week. Below are a few hints for you:

First: Days are Sunday, Monday and so on.
Second: One day he says, "I lie on Monday and Tuesday".
Third: On the next day, he says, "Today is either Thursday, Saturday or Sunday".
Fourth: On the next day, he says, "I lie on Wednesday and Friday".

Can you identify the day on which he speaks the truth?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?