GRE Questions

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Yes, a square is a rhombus. But a rhombus is not a square unless the interior angles are at right angles.

We know that, a square is a quadrilateral with all sides equal and all the interior angles are 90 deg i.e, at right angles. 

Whereas

a rhombus is also a quadrilateral with all sides equal but the interior angles are not at right angles. Hence, if the interior angles of a rhombus are all at right angles (90 deg), then it is square.

Enforcing a penalty will motivate people to pay the bills. So, course of action a follows.
It is general tendency to act accordingly when a penalty clause slapped. So, course of action b follows.

The Riddle itself has the Answers.

What is a 4 letter word

Yet is written in 3 letters

Everything is written with 9 letters

Then with 4 letters

Rarely has 6 letters

Never is written in 5 letters.

Its a Needle. Needle has an eye but can't see.

When you are Asleep or Dead, you cannot answer Are you Asleep or Dead?

NOTHING.

A rich man needs nothing, a poor man has nothing with him, and if we eat nothing, we will die.

A snowman is a cold man without a soul, if there is warmth in it, it slowly will kill him.

The resistivity of wire or the metal conductor is depend on the number density of free electrons in the conductor. so its mainly depends on nature of the material