scientist, discoveries & inventions MCQ section 2 Practice Questions Answers Test with Solutions & More Shortcuts

Answer: (d)

The first electric light was made in 1800 by Humphry Davy, an English scientist. However, Thomas Edison is usually credited with the invention of the light bulb. He invented the first commercially practical incandescent light in 1879.

Answer: (c)

Acquired Immunodeficiency Syndrome (AIDS) was first reported in 1981 in San Francisco and New York. However, it was in 1983-84 that the causative virus was isolated from patients of AIDS and was named HIV in 1986.

Answer: (b)

Pedology is the study of soils in their natural environment. It is concerned with all aspects of soils, including their physical and chemical properties, the role of organisms in soil production and in relation to soil character, the description and mapping of soil units, and the origin and formation of soils.

Answer: (d)

Meteorology is the study of the atmosphere, atmospheric phenomena, and atmospheric effects on our weather. It is a sub-discipline of the atmospheric sciences, a term that covers all studies of the atmosphere. The atmosphere is the gaseous layer of the physical environment that surrounds a planet.

Answer: (a)

A hygrometer, also known as a psychrometer, is used to measure the humidity in the air. A common way these devices work is by using a material that attracts moisture, and that changes depending on how moist it is.

Aside from greenhouses and industrial spaces, hygrometers are also used in some incubators, saunas, humidors and museums.