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

What does below Rebus mean ?

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We are a group of eight brothers. We consider the weak, yet we protect the king in every battle. If we move ahead, we never turn back. Who are we?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

How many times in a given day, minutes and hour clock comes in a straight line ?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

There is a barrel with no lid and some wine in it. 'This barrel of wine is more than half full,' said Curly. 'No it's not,' says Mo. 'It's less than half full.' Without any measuring implements and without removing any wine from the barrel, how can they easily determine who is correct?

What kind of tree can you carry in your hand?

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?