What month of the year has 28 days?

Replace the question mark in the picture below.

Can anyone tell me a word in the English dictionary which has a silent 'z'?

A girl was sitting in her hotel room when she heard a knock on the door. She opened the door and found that a man was standing outside. The man said, "Oh! I am really sorry, I thought this was my room." He then walked through the corridor to the elevator. The girl did not know the man. She closed her door and called security asking them to apprehend the man. What made her suspicious of that man? He might have been genuinely mistaken.

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

It belongs to you, but other people use it more than you do. What is it?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls, will you have to pick up so that you have at least 4 balls of the same colour?

In the picture given below, can you find out which digit will take place of the question mark?

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?