What has one letter and starts with an E?

Can you identify the hidden rebus in the image below?

Akbar called Birbal and asked him to draw a line on the floor. He asked Birbal to make that line smaller without erasing it. Birbal smiled and did it before Akbar could blink his eyes.

How did he managed to do it?

Make a sentence consisting of three words that have the whole alphabet.

What is the centre of gravity?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Can you find the odd number in the following five choices?

1) 482636
2) 259807
3) 865195
4) 104739
5) 391744

What you cannot hold but it is yours?

How can you drop a raw egg from a height onto a concrete floor without cracking it?