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

Can you find out the remainder when 3^300 is divided by 5?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

What is the word or phrase?

I am 5 letters long.
My first two tell you who I am
My first 3 could be a medicine
My last three reversed could be a young boy.
My 4th, 3rd and 2nd in that order could be a fruit drink.
If you have me you may hang me round your neck
WHAT AM I ?

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

Name the three-letter word that can complete the below words?

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

What four weights can be used to balance from 1 to 30 pounds?

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

I have branches, but no fruit, trunk or leaves. What am I?