Physics
Stars appears to move from east to west because

The background of the stars moves from west to east
The earth rotates from west to east
The earth rotates from east to west
All stars move from east to west

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Physics
Which of the following is not a property of heavy water ?

Boiling point of heavy water is lower than that or ordinary water
Density of heavy water is higher than that of ordinary water
Freezing point of heavy water is higher than that of ordinary water
It produces corrosion

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