Physical Science
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Q161.The carbon dioxide content in the air that we exhale is about?
Correct Answer: A
The carbon dioxide content in the air that we exhale is about: 4%. Its composition and chemical or physical behavior give it the stated classification or property.
Q162.The Carbon Dioxide in the atmosphere, by volume, is____?
Correct Answer: A
The Carbon Dioxide in the atmosphere, by volume, is 0.039%. Its geographic position or physical characteristics account for the description given.
Q163.The chemical name of Acid” (Tezaab) is____?
Correct Answer: A
The chemical name of Acid” (Tezaab) is Sulfuric acid. Its composition and chemical or physical behavior give it the stated classification or property.
Q164.The chemical name of bauxite ____ ?
Correct Answer: A
The chemical name of bauxite Aluminium Oxide. Its composition and chemical or physical behavior give it the stated classification or property.
Q165.The chemical name of chalk is
Correct Answer: D
The chemical name of chalk is Calcium carbonate. Its composition and chemical or physical behavior give it the stated classification or property.
Q166.The chemical name of Laughing gas is____?
Correct Answer: D
The chemical name of Laughing gas is Nitrous oxide. Its composition and chemical or physical behavior give it the stated classification or property.
Q167.The chemical name of quartz is:
Correct Answer: A
The chemical name of quartz is Silicon Dioxide. Its composition and chemical or physical behavior give it the stated classification or property.
Q168.The chief constituents of gobar gas is____?
Correct Answer: A
The chief constituents of gobar gas is Methane. Its composition and chemical or physical behavior give it the stated classification or property.
Q169.The element common to all acids is:____?
Correct Answer: A
The element common to all acids is: Hydrogen. Its composition and chemical or physical behavior give it the stated classification or property.
Q170.The element used in lead pencils is____?
Correct Answer: C
The element used in lead pencils is Carbon. Its composition and chemical or physical behavior give it the stated classification or property.
Q171.The gas used in a refrigerator to cool water is____?
Correct Answer: D
The gas used in a refrigerator to cool water is Tetrafluoroethane. Its composition and chemical or physical behavior give it the stated classification or property.
Q172.The gas usually filled in the electric bulb is____?
Correct Answer: A
The gas usually filled in the electric bulb is Nitrogen. Its composition and chemical or physical behavior give it the stated classification or property.
Q173.The gas, commonly known as laughing gas”, is
Correct Answer: C
The gas, commonly known as laughing gas”, is Nitrous Oxide. Its composition and chemical or physical behavior give it the stated classification or property.
Q174.The gases which are used by drivers as an artificial atmosphere are helium and____?
Correct Answer: B
The gases which are used by drivers as an artificial atmosphere are helium and Oxygen. Its geographic position or physical characteristics account for the description given.
Q175.The Green House Effect is caused by an excess of ?
Correct Answer: A
The Green House Effect is caused by an excess of: Carbon dioxide. The named agent or condition produces the characteristic biological changes associated with the disease.
Q176.The group of minerals chemically containing hydrocarbons is____?
Correct Answer: B
The group of minerals chemically containing hydrocarbons is Organic group. Its composition and chemical or physical behavior give it the stated classification or property.
Q177.The half life of a radioactive element is 8-days. How long it take to reduce it from 10 mg to 5 mg?
Correct Answer: D
The half life of a radioactive element is 8-days. How long it take to reduce it from 10 mg to 5 mg: 8 days. Its composition and chemical or physical behavior give it the stated classification or property.
Q178.The heaviest man made element found so for is____?
Correct Answer: B
The heaviest man made element found so for is Ununoctium. Its composition and chemical or physical behavior give it the stated classification or property.
Q179.The heaviest naturally-occurring element is____?
Correct Answer: C
The heaviest naturally-occurring element is Uranium. Its composition and chemical or physical behavior give it the stated classification or property.
Q180.The main constituent of Pearls are: ____?
Correct Answer: B
The main constituent of Pearls are: Calcium Carbonate &Megnesium Carbonate. This description follows from the defining characteristics and established facts associated with the subject.