A. 4 B. 5 C. 6 D. 7
Sound waves from a loudspeaker are caused by
A. frequency B. vibrations C. pitch D. amplitude
The number of oscillations per second is called the
A. hertz B. waves C. pitch D. frequency
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
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
The fourth state of matter is
A. Water B. Salts C. Vapours D. Plasma