You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. 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?

Solve the puzzle by telling what does below picture means.

Can you find the key in the picture below?

What four weights can be used to balance from 1 to 30 pounds?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

At a Society election for president, precisely 963 votes were cast.
There is a total of 4 candidates that participate in the election.

The winning candidate exceeds the opponents by 53, 79 and 105 votes.

How many votes do each candidate gets?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

What Time Should the last watch show in the below figure?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?