How can you make number one disappear by adding something to it?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

Find the smallest sentence with all the English alphabet.

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

With the help clues provided in the image, can you find the 5 digit key?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

Which is heavier: a ton of bricks or a ton of feathers?

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?

The LCD device should be able to tell the right time in the format HH:MM: SS in a 12-hour format. You can refer to the picture to get an idea. The device is a simple "level indicator" which has to be converted into a watch. How will you program it to work?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?