What is the wavelength of visible spectrum:
What is the wavelength of visible spectrum:
A. 1300-3000A
B. 3900-7600A
C. 7800-8000A
D. None of these
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Edward Genner discovered ‘vaccine’ in___________?
Edward Genner discovered ‘vaccine’ in___________?A. 1796
B. 1978
C. 1686
D. 1933On May 14, 1796, Jenner took fluid from a cowpox blister and scratched it into the skin of James Phipps, an eight-year-old boy. A single blister rose up on the spot, but James soon recovered. On July 1, Jenner inoculated the boy again, this time with smallpox matter, and no disease developed. The vaccine was a success.
The scientific study of fingerprints is called _________ ?
The scientific study of fingerprints is called _________ ?A. Dactylography
B. Dactylology
C. Dactyliology
D. Dialectology
Dactylography is also called Dactyloscopy, the examination of finger prints. NOTE: Dermatoglyphics (from ancient Greek derma = “skin”, glyph = “carving”) is the scientificstudy of fingerprints.The main cause of air pollution is __________?
The main cause of air pollution is __________?A. Burning Of Fuels
B. Forests
C. Fertilizers
D. None of theseWhy the needle of iron swims on water surface when it is kept gently ?
Why the needle of iron swims on water surface when it is kept gently ?A. It will remain under the water, when it will displace more water than its weight
B. the density of needle is less than that of water
C. due to surface tension
D. due to its shapeEarthquakes occur most frequently at __________?
Earthquakes occur most frequently at __________?A. Plate boundaries
B. Plate surface
C. Ocean beds
D. All of the aboveThe Virus of AIDS affects the growth of_____________?
The Virus of AIDS affects the growth of_____________?
A. Hemoglobin
B. RBCs in blood
C. T cells in blood
D. Grey Cells in blood