I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

A boy was locked in a room by some robbers. All that is in the room is a piano, a calendar, and a bed. The room is locked from the outside. What does he eat, drink, and how does he escape and get out?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

Can you find out who is the kidnapper in below Picture and why, Explain ?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

O_er_t_o_

Complete the missing letters of the given word.

A time long back, there lived a king who ruled the great kingdom of Trojan House. As a part of the renovation of the kingdom to meet future security needs, he asked his chief architect to lay down a new play in a manner that all of his 10 castles are connected through five straight walls and each wall must connect four castles together. He also asked the architect that at least one of his castles should be protected with walls. The architect could not come up with any solution that served all of King's choices, but he suggested the best plan that you can see in the picture below. Can you find a better solution to serve the king's demand?

Why is a river so rich ?

Forwards I am heavy, backward I am not. What am I?

If you drop a 15 kg iron bar and a 5 kg bag of cotton from a height of 50 meters which will reach the ground first?