Can you find out which number multiplied by itself will give the output as 12345678987654321?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

What 8 letter word can have a letter taken away and it still makes a word. Take another letter away and it still makes a word. Keep on doing that until you have one letter left. What is the word?

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

As a whole I am both
safe and secure.

Behead me and I become
a place of meeting.

Behead me again and I am
the partner of ready.

Restore me, and I become
the domain of beasts.

What am I?

In the four images below, can you find the odd one out?

Sachin bought a car with a strange 5 digit numbered plate.The water image of the number is 78633 more than my car number. All the digits of car number are distinct.

What is the original number on number plate?