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 General Science Questions

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Q:

If a tropical rain forest is removed, it does not regenerate quickly as compared to a tropical deciduous forest. This is because 

A) The soil of rain forest is deficient in nutrients B) Propagules of the trees in a rain forest have poor viability
C) The rain forest species are slow growing D) Exotic species invade the fertile soil of rain forest
 
Answer & Explanation Answer: A) The soil of rain forest is deficient in nutrients

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Q:

Seawater (i.e. saltwater) freezes at: 

A) at a slightly higher temperature than fresh water B) at a slightly lower temperature than fresh water.
C) the same temperature as fresh water. D) seawater does not freeze.
 
Answer & Explanation Answer: B) at a slightly lower temperature than fresh water.

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Q:

The radioactive element most commonly detected in humans is

A) potassium-40 B) cobalt-60
C) iodine-131 D) plutonium-238
 
Answer & Explanation Answer: A) potassium-40

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Q:

The filament of an electric bulb is made of

A) tungsten B) nichrome
C) graphite D) iron
 
Answer & Explanation Answer: A) tungsten

Explanation:

A filament is a metal wire that glows when electricity is channeled into it. The filament of an electric bulb is made of Tunsten. 

 

The_filament_of_an_electric_bulb_is_made_of1554113110.jpg image

 

Because of its high melting point and its greatest tensile strength, it makes for a good filament in light bulbs.

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Q:

What is laughing gas?

A) Nitrous Oxide B) Carbon monoxide
C) Sulphur dioxide D) Hydrogen peroxide
 
Answer & Explanation Answer: A) Nitrous Oxide

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Q:

Of the following, which element is common to all acids

A) hydrogen B) carbon
C) sulphur D) oxygen
 
Answer & Explanation Answer: A) hydrogen

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Q:

What does airbag, used for safety of car driver, contain?

A) Sodium bicarbonate B) Sodium azide
C) Sodium nitrite D) Sodium peroxide
 
Answer & Explanation Answer: B) Sodium azide

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Q:

Which of the following plants is not capable of manufacturing own food?

A) Algae B) Mushroom
C) Carrot D) Cabbage
 
Answer & Explanation Answer: B) Mushroom

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