I make two people out of one. What am I?

They are three errirs in this question. Can you find them?

Two friends were stuck in a cottage. They had nothing to do and thus they started playing cards. Suddenly the power went off and Friend 1 inverted the position of 15 cards in the normal deck of 52 cards and shuffled it. Now he asked Friend 2 to divide the cards into two piles (need not be equal) with equal number of cards facing up. The room was quite dark and Friend 2 could not see the cards. He thinks for a while and then divides the cards in two piles.

On checking, the count of cards facing up is same in both the piles. How could Friend 2 have done it ?

Identify the next two numbers in this series.

101, 112, 131, 415, 161, 718, ???, ???

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

A man embarked on a questionnaire game. He kept asking the same question to whomever he found. The answer each time was different.

Can you guess what the question was?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

Solve the rebus riddle in the picture below.