What is black when you buy it, red when you use it, and gray when you throw it away?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

I don't get anymore wetter, no matter how much rain falls on me.

Can you identify the Oscar-winning movie from the rebus below?

You see me once in June, twice in November, and not at all in May. What am I?

Can you find out which triangle will have a bigger area among the following?
1. A triangle with sides 300, 400 and 500
2. A triangle with sides 300, 400 and 700

Complete the table series riddle by finding the number that can replace "??".

In a supermarket, there is an intelligent glass pane before a refrigerating unit. This glass pane allows cherries and apples through it but does not allow grapes and Orange to pass through it.

Can you identify the rule that the glass pane is following?

Usually, a boxing match consists of twelve rounds. In a particular friendly match between two heavyweights, the match was finished in the ninth round itself as one of the boxers knocked out the other one.

But, in that fight, no man threw even a single punch.

How can this be possible?