What breaks yet never falls, and what falls yet never breaks?

Can you find the thief by just looking at the picture below?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Two fathers and two sons decided to go to a shop and buy some sweets upon reaching. Each of them bought 1 kg of sweet. All of them returned home after some time and found out that they had 3kg of sweets with them.

They did not eat the sweets in the way, nor threw or lose anything. Then, how can this be possible?

One evening there was a murder in the home of a married couple, their son and daughter. One of these four people murdered one of the others. One of the members of the family witnessed the crime.

The other one helped the murderer.

These are the things we know for sure:

1. The witness and the one who helped the murderer were not of the same sex.

2. The oldest person and the witness were not of the same sex.

3. The youngest person and the victim were not of the same sex.

4. The one who helped the murderer was older than the victim.

5. The father was the oldest member of the family.

6. The murderer was not the youngest member of the family.

Who was the murderer?

Count the number of triangles in the below picture?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?