The device used to convert Alternate Current into Direct Current is called
(A) Anemometer
(B) Battery
(C) Galvanometer
(D) Rectifier
About 50% of the Earth’s crust, including the waters on the Earth and atmosphere, is
(A) Oxygen
(B) Cabon Dioxide
(C) Silicon
(D) Clay
Acid rain is mainly caused by emissions of __________ in the atmosphere
(A) Sulfur Dioxide and Potassium Nitrate
(B) Sulfur and Charcoal
(C) Nitrogen Oxide and Potassium Nitrate
(D) Sulfur Dioxide and Nitrogen Oxide
In general, wind speed of 105–137 caused_______
(A) minor or no damage
(B) considerable damage
(C) severe damage
(D) extreme damage
The natural fats and oils are composed of_________
(A) Carbon, Hydrogen and Oxygen
(B) Carbon, Hydrogen and Nitrogen
(C) Carbon, Oxygen and Nitrogen
(D) Hydrogen, Oxygen and Nitrogen