Solution:

811105 is the highest number that can be formed moving two matchsticks.

If your answer was 511108, you're almost right. All you have to do is look at that upside down. See the first picture and then the second.

Solution:

The answer is D.

Since all the patters appear twice in the given picture, the answer will be the option which does not have similar faces.

Solution:

The required digit is 0.
If you add up all the digits in any diagonal, you will find the sum to be 25.

Solution:

Popular Illusion - It can be seen as
1. Vase painted with white
Or
2. Two faces facing each other painted in black.

Solution:

There are twenty-four triangles in the given picture.

Solution:

The rabbit is present in the left tusk of the elephant.

Solution:

The number missing on the left is 8 and the one on right is 7.

Explanation:
The pattern:
The number in the center of triangle is the square root of the sum of the numbers sitting outside on the corners.

Thus,
10 + 22 + 4 = 36
Square Root of 36 = 6

In the same manner:

10 + 42 + 12 = 64
Square Root of 64 = 8

12 + 22 + 15 = 49
Square Root of 49 = 7

Solution:

It can be achieved as it is shown in the figure.

Solution:

The correct choice will be the option 'd'.

In each succeeding row, the previous column is reversed and the lowest digits are omitted.

Solution:

We have provided you with one of the possible solutions. However, there can be three more solutions to this problem.