Q. What is the primary type of bonding in metallic solids? (2020)
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A.
Ionic bonding
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B.
Covalent bonding
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C.
Metallic bonding
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D.
Hydrogen bonding
Solution
Metallic solids are primarily held together by metallic bonding, which involves a 'sea of electrons' that are free to move.
Correct Answer: C — Metallic bonding
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Q. What is the primary use of bioremediation? (2023)
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A.
To produce biofuels
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B.
To clean up environmental pollutants
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C.
To enhance soil fertility
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D.
To increase crop yield
Solution
Bioremediation is primarily used to clean up environmental pollutants using microorganisms.
Correct Answer: B — To clean up environmental pollutants
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Q. What is the primary use of boron in the industry? (2023)
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A.
Fertilizers
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B.
Glass production
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C.
Detergents
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D.
Pharmaceuticals
Solution
Boron is primarily used in the production of glass and ceramics.
Correct Answer: B — Glass production
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Q. What is the primary use of calcium carbonate? (2019)
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A.
As a fertilizer
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B.
In the production of glass
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C.
As a building material
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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 CRISPR technology in biotechnology? (2023)
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A.
Gene editing
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B.
Protein synthesis
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C.
Cell culture
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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 glycerol in the food industry? (2023)
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A.
Sweetener
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B.
Preservative
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C.
Thickening agent
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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 insulin produced through recombinant DNA technology? (2022)
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A.
To treat diabetes
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B.
To enhance growth in livestock
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C.
To improve crop yield
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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)
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A.
As a conductor
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B.
As a cathode material
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C.
As an anode material
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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)
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A.
Construction
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B.
Aerospace
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C.
Electronics
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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 sulfuric acid (H2SO4) in industry? (2019)
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A.
Fertilizer production
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B.
Battery acid
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C.
Cleaning agent
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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 in the industry? (2023)
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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 titanium dioxide (TiO2)? (2023)
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A.
Pigment
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B.
Catalyst
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C.
Semiconductor
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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 third energy level? (2019)
Solution
The principal quantum number (n) indicates the energy level; for the third energy level, n = 3.
Correct Answer: C — 3
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Q. What is the principal quantum number of the outermost electron in a chlorine atom? (2022)
Solution
Chlorine has an atomic number of 17, and its outermost electrons are in the 3rd shell, so n=3.
Correct Answer: C — 3
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Q. What is the principal quantum number of the outermost electron in an atom of potassium? (2022)
Solution
Potassium has an atomic number of 19, and its outermost electron is in the n=4 shell.
Correct Answer: C — 3
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Q. What is the principal quantum number of the outermost electrons in an atom of chlorine? (2022)
Solution
Chlorine has an atomic number of 17, and its outermost electrons are in the n=3 shell.
Correct Answer: C — 3
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Q. What is the principle behind a photodiode? (2022)
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A.
Thermal emission
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B.
Photoelectric effect
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C.
P-N junction
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D.
Capacitance
Solution
A photodiode operates on the principle of the photoelectric effect, where light generates electron-hole pairs.
Correct Answer: B — Photoelectric effect
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Q. What is the principle behind a thermos flask? (2022)
-
A.
Conduction
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B.
Convection
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C.
Radiation
-
D.
Insulation
Solution
The principle behind a thermos flask is insulation, which minimizes heat transfer.
Correct Answer: D — Insulation
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Q. What is the principle behind the operation of a hydraulic lift? (2019)
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A.
Bernoulli's principle
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B.
Archimedes' principle
-
C.
Pascal's law
-
D.
Newton's law
Solution
A hydraulic lift operates based on Pascal's law, which states that pressure applied to a confined fluid is transmitted undiminished in all directions.
Correct Answer: C — Pascal's law
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Q. What is the principle behind the working of a galvanometer? (2023)
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A.
Electromagnetic induction
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B.
Magnetic force on a current-carrying conductor
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C.
Electrostatic force
-
D.
Magnetic field lines
Solution
A galvanometer works on the principle of the magnetic force acting on a current-carrying conductor placed in a magnetic field.
Correct Answer: B — Magnetic force on a current-carrying conductor
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Q. What is the principle that states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure?
-
A.
Bernoulli's Principle
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B.
Archimedes' Principle
-
C.
Pascal's Law
-
D.
Newton's Law
Solution
Bernoulli's Principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure.
Correct Answer: A — Bernoulli's Principle
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Q. What is the principle that states that the buoyant force on an object is equal to the weight of the fluid displaced by the object?
-
A.
Archimedes' Principle
-
B.
Pascal's Law
-
C.
Bernoulli's Principle
-
D.
Newton's Law
Solution
Archimedes' Principle states that the buoyant force on an object is equal to the weight of the fluid displaced by the object.
Correct Answer: A — Archimedes' Principle
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Q. What is the principle that states that the pressure in a fluid decreases as the fluid's velocity increases?
-
A.
Bernoulli's Principle
-
B.
Pascal's Principle
-
C.
Archimedes' Principle
-
D.
Hydrostatic Principle
Solution
Bernoulli's Principle states that an increase in the velocity of a fluid occurs simultaneously with a decrease in pressure.
Correct Answer: A — Bernoulli's Principle
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Q. What is the probability of obtaining a homozygous recessive offspring from a cross between two heterozygous parents? (2022)
-
A.
0%
-
B.
25%
-
C.
50%
-
D.
75%
Solution
The probability of obtaining a homozygous recessive offspring (aa) from a cross between two heterozygous parents (Aa x Aa) is 25%.
Correct Answer: B — 25%
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Q. What is the process by which DNA is copied to produce two identical DNA molecules? (2021)
-
A.
Transcription
-
B.
Translation
-
C.
Replication
-
D.
Recombination
Solution
Replication is the process by which DNA is copied to produce two identical DNA molecules.
Correct Answer: C — Replication
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Q. What is the process called when a nucleus emits an alpha particle? (2019)
-
A.
Beta decay
-
B.
Gamma decay
-
C.
Alpha decay
-
D.
Fission
Solution
The emission of an alpha particle from a nucleus is known as alpha decay.
Correct Answer: C — Alpha decay
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Q. What is the process called when heat is transferred through a fluid? (2019)
-
A.
Conduction
-
B.
Convection
-
C.
Radiation
-
D.
Insulation
Solution
Convection is the process of heat transfer through a fluid (liquid or gas) due to the movement of the fluid itself.
Correct Answer: B — Convection
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Q. What is the process of converting a neutron into a proton called? (2020)
-
A.
Beta decay
-
B.
Alpha decay
-
C.
Gamma decay
-
D.
Fission
Solution
Beta decay is the process in which a neutron is converted into a proton, emitting an electron and an antineutrino.
Correct Answer: A — Beta decay
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Q. What is the process of fusion of male and female gametes called? (2019)
-
A.
Pollination
-
B.
Fertilization
-
C.
Germination
-
D.
Transpiration
Solution
The process of fusion of male and female gametes is called fertilization.
Correct Answer: B — Fertilization
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