How many words can a pen with half refill write?

Which is heavier: a ton of bricks or a ton of feathers?

Take one out and scratch my head, I am now black but once was red. What am I?

I look at you, you look at me I raise my right, you raise your left. What am I?

Count the Triangle in the figure given below:

Can you find any error in the following sentence?

A taxi was standing outside a fort at night. A man came out of the fort, opened the gate and hit the taxi driver killing him instantly. He took all the money out of the meter and started running till he was caught by a local sheriff.

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

I have thought of a number that is made up by using all the ten digits just once. Here are a few clues for you to guess my number:

First digits is divisible by 1.
First two digits are divisible by 2.
First three digits are divisible by 3.
First four digits are divisible by 4.
First five digits are divisible by 5.
First six digits are divisible by 6.
First seven digits are divisible by 7.
First eight digits are divisible by 8.
First nine digits are divisible by 9.
The number is divisible by 10.

Can you find out the number ?

Different lights make me strange by changing me into different sizes. What am I?

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

Can you find the number?