What four weights can be used to balance from 1 to 30 pounds?

In the picture given below, can you find out which digit will take place of the question mark?

Its something that each of us devours,
Not just us but birds, beats, trees, and flowers,
Frets iron and nibbles steel,
Toil hard stones to meal,
Exterminates king, collapse town,
And blows the mountains down.

Identify the 10 differences between the two given pictures.

Can you Find and name the hidden bird in the picture below ?

Steffi's daughter Jazelle needs to be picked up from school every day.
Steffi asks one of her colleagues to pick up Jazelle from the school. Steffi devised a password system to confirm that Jazelle goes with the correct colleague only.

The password on Monday was SJM16.
The password on Wednesday was TAW39.

What will the password be for Friday?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?