A maths symbol is hidden in the below Bar Graph. Can you decipher it?

Can you replace the question mark with the correct number?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

Suppose that you are trapped on the surface of a frozen lake. The surface is so smooth and ideal that there is no friction at all. You cant make any grip on the ice and no wind is blowing to help you out. You have just a mobile phone with you which has got no reception disabling you to call for help.

How will you plan your escape before you freeze to death on the frozen lake?

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

In a contest, four fruits (an apple, a banana, an orange, and a pear) have been placed in four closed boxes (one fruit per box). People may guess which fruit is in which box. 123 people participate in the contest. When the boxes are opened, it turns out that 43 people have guessed none of the fruits correctly, 39 people have guessed one fruit correctly, and 31 people have guessed two fruits correctly.
How many people have guessed three fruits correctly, and how many people have guessed four fruits correctly

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?