What has no start, end, or centre?

Count the Triangle in the figure given below:

What occurs twice in a week, once in a year but never in a day?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

This is a simple one. You just have to count the number of Fs in the given sentence.

Finished Files are the result of years of scientific study combined with the experience of years.

How many did you count?

What goes through cities and fields, but never moves?

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

You have to put a letter on the following to make it a meaningful word. The only challenge is that you can't use 'E'.

S E Q U E N C _

Three playing cards in a row. Can you name them with these clues? There is a two to the right of a king. A diamond will be found to the left of a spade. An ace is to the left of a heart. A heart is to the left of a spade. Now, identify all three cards.