Can you find the key in the picture below?

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?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

What does the below image rebus riddle means ?

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

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

People put me on the table and cut me but do not eat me. What am I?

There is a place where if I stand up straight, I will still be considered sideways.