The latin roots for the word

Which name is commonly used for "Sirius," the brightest star visible outside our solar system? 

What causes the permanent hardness of water?

For domestic wiring purposes, how are circuits connected?

Which of the following is used as a substitute for mercury in thermometers?

What is the term for the Moon's orbit around the Earth with respect to the stars? 

On which day does the difference between day and night lengths reach its maximum?

What is the most abundant gas in the Earth's atmosphere.

Which enzyme is pivotal in blood clotting?

Which one is the largest Island of Japan?

Which of the following is used for the electrical insulation bulttons?