Solution:

Muz is the required code word.

In the statements (1), (2) and (3), common coded word is 'Stew' and common normal word is 'are'. Therefore, 'Stew' = 'are'.
k
In the statements (1) and (4), common coded word (except 'are') is 'Choi' and common normal word is 'Spirits'. Therefore, 'Choi' = 'Spirits'.

Likewise, in the statements (2), (3) and (4), common coded word is 'Fru' and common normal word is 'Sinister'. So, 'Fru' = 'Sinister'.

Hence, 'Choi', 'Stew', 'Fru' means 'Spirits', 'are', 'Sinister' respectively. Thus, in statement (4), the remaining word i.e., 'Muz' = 'the'.

Solution:

It is best if the person sits on the back of the train. After the stop, the train will be accelerating as it goes into the tunnel. Thus the train will be much master when the back of the train enters the tunnel. In this way, he will have to spend much less time in the tunnel.

Solution:

Read the question carefully again. New Year do falls after Christmas but that happens if two different years. The question is put up against the year 2050 and thus there will be 51 weeks and 2 days in between them as New Year will appear on 1 January 2050 and Christmas will happen on 25 December 2050.

Solution:

one fish, one cat and one dog.

Explanation:
The question might appear a bit difficult in the starting but if you analyze the statements, you will realize that it is just a tricky one.

All except two were fishes and all except two were cats. With these statements we can assume that two of the animals were not fishes and two were not cats. Now one of those animals that are not fishes can be a cat and one of those two animals that are not cats can be a fish. Just carry out the same analysis for the statement that all except two animals were not dogs and you will come across the result i.e.:
In that competition, there was one fish, one cat and one dog.

Solution:

LOTTO

Explanation:
Just flip the two rows 1 and 2 vertically, you will find the word "Lotto".

Solution:

The clerk said that every day the password is CHANGED. Changed is the password.

Solution:

192 021

If you look at it as two-digit numbers you'll see:10 11 12 13 14 15 16 17 18 19 20 21

Solution:

The ball will take infinite bounces before it is stopped. As per the question it will keep on bouncing half way up every time it hits the ground. But gravity will play its part at certain point of time which will make it stop.

Solution:

41312432

Solution:

Zouma is 3 and has two footballs.
Ake is 1 and has one football.
Kalas is 4 and has three footballs.
Aina is 2 and has four footballs.

Solution:

Slumdog Millionare = Slum + Dog + Million + air