What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

What demands an answer, but asks no questions

In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls, will you have to pick up so that you have at least 4 balls of the same colour?

Can you write down eight eights so that they add up to one thousand?

What seven-letter word has hundreds of letters in it?

A mathematics teacher took exams for his students. Out of the total students, 25% passed both the tests included in the exam. However, only 42% were able to clear the first test.

Can you find out the percentage of those students who passed the first test and also passed the second test?

What goes through cities and fields, but never moves?

What does Alexander the Great and Winnie the Pooh have in common?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?