General Science Questions

Q:

Which of the following is not an intensive property?

A) Weight B) Density
C) Refractive index D) Melting point
 
Answer & Explanation Answer: A) Weight

Explanation:

An intensive property is a physical quantity whose value does not depend on the amount of the substance for which it is measured. For example, the temperature of a system in thermal equilibrium is the same as the temperature of any part of it. If the system is divided the temperature of each subsystem is identical. The same applies to the density of a homogeneous system, if the system is divided in half, the mass and the volume change in the identical ratio and the density remains unchanged. Additionally, the boiling point of a substance is another example of an intensive property. For example, the boiling point for water is 100 °C at a pressure of one atmosphere, a fact which remains true regardless of quantity.

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Q:

Exercise is a subset of physical activity that is

A) Repetative B) Planned
C) Structured D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

Exercise is a subset of physical activity that is planned, structured and repetative.

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Q:

The term "simple carbohydrates" refers to

A) polysaccharides B) monosaccharides and disaccharides
C) starch and glycogen D) dietary fiber
 
Answer & Explanation Answer: B) monosaccharides and disaccharides

Explanation:

Simple carbohydrates are also called as Simple sugars. Monosaccharides and Disaccharides refers to simple carbohydrates.

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Q:

A Disease which spreads by contact?

A) Infectious B) Fatal
C) Incurable D) Contagious
 
Answer & Explanation Answer: D) Contagious

Explanation:

A Disease which spreads by contact are Contagious.

Infectious diseases : These are caused by microscopic germs such as bacteria or viruses that get into the body and cause problems. Some but not all infectious diseases spread directly from one person to another. Infectious diseases that spread from person to person are said to be contagious. Some infections spread to people from an animal or insect, but are not contagious from another human. 

Contagious diseases such as the flu, colds, or strep throat spread from person to person in several ways. One way is through direct physical contact, like touching or kissing a person who has the infection. Another way is when an infectious microbe travels through the air after someone nearby sneezes or coughs.

Fatal Diseases : Diseases leading to failure or disaster.

Incurable Diseases : Diseases of a sick person not able to be cured.

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Q:

How many hours does it take for a housefly's egg to hatch?

Answer

24 hours

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Q:

The closest algal relatives of land plants are

A) charophytes B) chrysophytes
C) rhodophytes D) bacillariophytes
 
Answer & Explanation Answer: A) charophytes

Explanation:

The charophytes are the extant group of green algae that are most closely related to modern land plants.

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Q:

Which of the following causes tornadoes?

A) condensation B) dry climates
C) wind shear D) stationary fronts
 
Answer & Explanation Answer: B) dry climates

Explanation:

Conditions suitable for the formation of a tornado develop when varying temperatures and humidity come together and form thunderclouds. This refers to the presence of warm and moist condition in the lower atmosphere and cold and dry conditions in the upper atmosphere. The place where these varying masses of air meet is known as the dry-line. Such conditions, which are suitable for the formation of a tornado, are most often observed just before a low pressure system develops.

 

Once the ideal conditions occur, the warm air tries to rise in the atmosphere, while the cold air blocks it. This makes the air in between rotate horizontally. In the meanwhile, the land is heated by the Sun, and hence, the air near the ground becomes warm and starts rising. Continuous fueling by the heat energy from the Sun ensures that the warm air has an upper hand over cold air. As a result of this, the cold air at the top starts sinking and the warm air below starts rising in a spinning motion. As the amount of warm air increases, the formation gains height and becomes intense. The intensity of these devastating tornadoes is such that they can clear off anything that comes in their path.

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Q:

Generally, plants absorb dissolved nitrates from soil and convert them into

A) Ammonia B) Urea
C) Protein D) Nitrogen
 
Answer & Explanation Answer: D) Nitrogen

Explanation:

Generally, plants absorb dissolved nitrates from soil and convert them into free nitrogen.

 

  • Free nitrogen is simply molecular nitrogen (N2).

 

  • Nitrogen, in its molecular form, consists of two nitrogen atoms bound together with a triple bond.
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