Which is faster, Heat or Cold ? Explain.

In which direction should the missing arrow point?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?

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

John, a 5-year-old boy, was really fond of the chocolates. He asked his Mother to give him some money to buy his favourite chocolates. His Mother gave him $45. He went to the shopkeeper and asked, "How much is one chocolate for?". The shopkeeper said $3 for one chocolate. Also, if you give me the wrappers of three chocolates, I will give you one for the exchange.
In total, how much chocolate could John eat?

Which digit occurred maximum times between the number 1 and 1000?

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.

Prove that the below maths equation is true.

8 + 8 = 91

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?