Q. What is the primary use of calcium carbonate? (2019)
-
A.
As a fertilizer
-
B.
In the production of glass
-
C.
As a building material
-
D.
In antacids
Solution
Calcium carbonate is commonly used in antacids to neutralize stomach acid.
Correct Answer:
D
— In antacids
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Q. What is the primary use of calcium in the industry?
-
A.
As a reducing agent
-
B.
In the production of cement
-
C.
In batteries
-
D.
As a fertilizer
Solution
Calcium is primarily used in the production of cement.
Correct Answer:
B
— In the production of cement
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Q. What is the primary use of chlorine in water treatment?
-
A.
To increase pH
-
B.
To remove hardness
-
C.
As a disinfectant
-
D.
To add minerals
Solution
Chlorine is primarily used as a disinfectant in water treatment.
Correct Answer:
C
— As a disinfectant
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Q. What is the primary use of citric acid in food?
-
A.
Preservative
-
B.
Flavor enhancer
-
C.
Thickener
-
D.
Coloring agent
Solution
Citric acid is commonly used as a flavor enhancer in food products.
Correct Answer:
B
— Flavor enhancer
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Q. What is the primary use of CRISPR technology in biotechnology? (2023)
-
A.
Gene editing
-
B.
Protein synthesis
-
C.
Cell culture
-
D.
DNA replication
Solution
CRISPR technology is primarily used for gene editing, allowing precise modifications to DNA sequences.
Correct Answer:
A
— Gene editing
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Q. What is the primary use of ethanol in everyday life?
-
A.
Fuel
-
B.
Solvent
-
C.
Antiseptic
-
D.
All of the above
Solution
Ethanol is used as a fuel, solvent, and antiseptic in various applications.
Correct Answer:
D
— All of the above
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Q. What is the primary use of glycerol in the food industry? (2023)
-
A.
Sweetener
-
B.
Preservative
-
C.
Thickening agent
-
D.
Flavor enhancer
Solution
Glycerol is commonly used as a sweetener in food products due to its sweet taste and ability to retain moisture.
Correct Answer:
A
— Sweetener
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Q. What is the primary use of hydrogen in the industry?
-
A.
Fertilizers
-
B.
Fuel cells
-
C.
Plastics
-
D.
Glass production
Solution
Hydrogen is primarily used in fuel cells for energy production.
Correct Answer:
B
— Fuel cells
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Q. What is the primary use of insulin produced through recombinant DNA technology? (2022)
-
A.
To treat diabetes
-
B.
To enhance growth in livestock
-
C.
To improve crop yield
-
D.
To produce biofuels
Solution
Insulin produced through recombinant DNA technology is primarily used to treat diabetes by regulating blood sugar levels.
Correct Answer:
A
— To treat diabetes
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Q. What is the primary use of lithium in batteries? (2023)
-
A.
As a conductor
-
B.
As a cathode material
-
C.
As an anode material
-
D.
As an electrolyte
Solution
Lithium is primarily used as an anode material in lithium-ion batteries due to its high electrochemical potential.
Correct Answer:
C
— As an anode material
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Q. What is the primary use of magnesium in industries? (2021)
-
A.
Construction
-
B.
Aerospace
-
C.
Electronics
-
D.
Pharmaceuticals
Solution
Magnesium is primarily used in the aerospace industry due to its lightweight and strength.
Correct Answer:
B
— Aerospace
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Q. What is the primary use of magnesium in industry? (2023)
-
A.
Construction
-
B.
Aerospace
-
C.
Electronics
-
D.
Pharmaceuticals
Solution
Magnesium is primarily used in construction and aerospace industries due to its lightweight and strength.
Correct Answer:
B
— Aerospace
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Q. What is the primary use of nuclear fission in power plants?
-
A.
To produce nuclear weapons
-
B.
To generate heat for electricity
-
C.
To create isotopes for medical use
-
D.
To study nuclear reactions
Solution
Nuclear fission is primarily used in power plants to generate heat, which is then converted into electricity.
Correct Answer:
B
— To generate heat for electricity
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Q. What is the primary use of nuclear fission?
-
A.
Medical imaging
-
B.
Nuclear power generation
-
C.
Smoke detectors
-
D.
Radiocarbon dating
Solution
Nuclear fission is primarily used for nuclear power generation.
Correct Answer:
B
— Nuclear power generation
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Q. What is the primary use of nuclear reactors?
-
A.
To produce nuclear weapons
-
B.
To generate electricity
-
C.
To create isotopes for medical use
-
D.
To study nuclear physics
Solution
The primary use of nuclear reactors is to generate electricity through controlled nuclear fission.
Correct Answer:
B
— To generate electricity
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Q. What is the primary use of polarizers in photography?
-
A.
To increase brightness
-
B.
To reduce glare
-
C.
To enhance colors
-
D.
To focus light
Solution
Polarizers are primarily used in photography to reduce glare from reflective surfaces.
Correct Answer:
B
— To reduce glare
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Q. What is the primary use of polyethylene?
-
A.
Insulation
-
B.
Packaging
-
C.
Textiles
-
D.
Adhesives
Solution
Polyethylene is primarily used in packaging due to its flexibility and durability.
Correct Answer:
B
— Packaging
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Q. What is the primary use of polystyrene?
-
A.
Insulation
-
B.
Packaging
-
C.
Textiles
-
D.
Adhesives
Solution
Polystyrene is widely used in packaging materials due to its lightweight and cushioning properties.
Correct Answer:
B
— Packaging
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Q. What is the primary use of potassium in agriculture?
-
A.
Fertilizer
-
B.
Pesticide
-
C.
Herbicide
-
D.
Soil conditioner
Solution
Potassium is primarily used as a fertilizer in agriculture.
Correct Answer:
A
— Fertilizer
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Q. What is the primary use of radioactive isotopes in medicine?
-
A.
Energy production
-
B.
Diagnostic imaging
-
C.
Food preservation
-
D.
Industrial applications
Solution
Radioactive isotopes are primarily used in medicine for diagnostic imaging and treatment.
Correct Answer:
B
— Diagnostic imaging
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Q. What is the primary use of silicon in the industry?
-
A.
Fertilizers
-
B.
Semiconductors
-
C.
Glass production
-
D.
Alloys
Solution
Silicon is primarily used in the semiconductor industry.
Correct Answer:
B
— Semiconductors
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Q. What is the primary use of sodium bicarbonate (NaHCO3)? (2020)
-
A.
Baking
-
B.
Cleaning
-
C.
Medicine
-
D.
All of the above
Solution
Sodium bicarbonate is used in baking, cleaning, and medicine, making it versatile.
Correct Answer:
D
— All of the above
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Q. What is the primary use of sodium bicarbonate in households?
-
A.
Cleaning agent
-
B.
Food preservative
-
C.
Antacid
-
D.
All of the above
Solution
Sodium bicarbonate is used for cleaning, as a food preservative, and as an antacid.
Correct Answer:
D
— All of the above
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Q. What is the primary use of sodium bicarbonate?
-
A.
Baking
-
B.
Medicine
-
C.
Cleaning
-
D.
All of the above
Solution
Sodium bicarbonate is used in baking, medicine, and cleaning.
Correct Answer:
D
— All of the above
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Q. What is the primary use of sulfuric acid (H2SO4) in industry? (2019)
-
A.
Fertilizer production
-
B.
Battery acid
-
C.
Cleaning agent
-
D.
Food preservative
Solution
Sulfuric acid is primarily used in the production of fertilizers.
Correct Answer:
A
— Fertilizer production
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Q. What is the primary use of sulfuric acid (H2SO4)? (2022)
-
A.
Fertilizer
-
B.
Battery acid
-
C.
Detergent
-
D.
Food preservative
Solution
Sulfuric acid is primarily used as battery acid in lead-acid batteries.
Correct Answer:
B
— Battery acid
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Q. What is the primary use of sulfuric acid in the industry? (2023)
-
A.
Fertilizer production
-
B.
Battery acid
-
C.
Detergent manufacturing
-
D.
Food preservation
Solution
Sulfuric acid is primarily used as battery acid in lead-acid batteries.
Correct Answer:
B
— Battery acid
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Q. What is the primary use of Teflon?
-
A.
Insulation
-
B.
Non-stick coatings
-
C.
Adhesives
-
D.
Textiles
Solution
Teflon is primarily used for non-stick coatings in cookware due to its low friction properties.
Correct Answer:
B
— Non-stick coatings
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Q. What is the primary use of titanium dioxide (TiO2)? (2023)
-
A.
Pigment
-
B.
Catalyst
-
C.
Semiconductor
-
D.
Reagent
Solution
Titanium dioxide (TiO2) is primarily used as a white pigment in paints and coatings.
Correct Answer:
A
— Pigment
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Q. What is the principal quantum number for an electron in the 4th shell?
Solution
The principal quantum number (n) corresponds to the shell number. For the 4th shell, n=4.
Correct Answer:
D
— 4
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