I shave every day, but my beard stays the same. What am I?

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

I’m tall when I’m young, and I’m short when I’m old. What am I?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

If an earthquake is 1 point higher on the Richter Scale than another earthquake which is actually 10 times stronger, how much stronger would an earthquake be if it was just half a point higher on the Richter scale?

How many triangles can you find in this given picture?

What word does this rebus represent?

meta meta
meta meta

what does the below math rebus puzzle mean?

I inserted a coin in a bottle and closed its mouth with the help of a cork. Now, I was able to take the coin out from the bottle without taking out the cork or breaking the bottle. Can you tell me how I did it?