What does this rebus means ?

PROG WORKRESS

The centre of the third figure is empty. What digit should fit inside?

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

How is a fly different from a mosquito?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

There are three boxes of different sizes with three cupcakes inside each of the boxes in Christina's kitchen. At night her daughter wakes up and goes to the kitchen. She opens a box and eats all three cakes.

But in the morning Christina finds out that each box still had three cupcakes. How?

What does the below rebus puzzle mean?

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?

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?