The number of oscillations per second is called the_____.
A. hertz
B. waves
C. pitch
D. frequency » Read More…
The first chemical explosive, Gunpowder, is a mixture of_____.
A. Sulfur, Charcoal and Nitrogen Oxide
B. Sulfur, Charcoal, and Potassium Nitrate
C. Sulfur and Charcoal
D. Charcoal and Potassium Nitrate
Mitochondria contain their own supply of_____.
A. DNA
B. Amino acids
C. Vitamins
D. Oxygen
______ are called the powerhouses of the cell.
A. Mitochondria
B. Vesicles
C. Lungs
D. Liver
During photosynthesis, plants_____.
A. take in Carbon Dioxide
B. take in Oxygen
C. give off Carbon Dioxide
D. give off Oxygen » Read More…
In night, when photosynthesis is stopped, plants_____.
A. take in Carbon Dioxide
B. take in Oxygen
C. give off Carbon Dioxide
D. give off Oxygen
The device used to convert Alternate Current into Direct Current is called_____.
A. Anemometer
B. Battery
C. Galvanometer
D. Rectifier » Read More…
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