How can you tell a raw egg from a hard-boiled egg?

Peter wakes up daily to pick up his cycle and crosses the border between Spain and France daily with a bag on his shoulder. He is investigated daily by the officials but they don't find anything suspicious.

If we tell you that he is smuggling something what would it be?

There are 100 bulbs in a room. 100 strangers have been accumulated in the adjacent room. The first one goes and lights up every bulb. The second one goes and switches off all the even-numbered bulbs - second, fourth, sixth... and so on. The third one goes and reverses the current position of every third bulb (third, sixth, ninth? and so on.) i.e. if the bulb is lit, he switches it off and if the bulb is off, he switches it on. All the 100 strangers progress similarly.

After the last person has done what he wanted, which bulbs will be lit and which ones will be switched off?

Be active and find the killer in the picture Riddle below.

If an electric train is travelling south, then which way is the smoke going?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

What does this mean?

CCCCCCC

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

Open a Laptop which is password protected. Hint for the password is given as below:

1 mobile 3 books 2 Boards 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?