Q. What is the primary process involved in the formation of a colloidal solution? (2022)
-
A.
Evaporation
-
B.
Condensation
-
C.
Dispersion
-
D.
Sublimation
Solution
Colloidal solutions are formed by the dispersion of fine particles in a medium, which is the process of dispersion.
Correct Answer:
C
— Dispersion
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Q. What is the primary producer in a freshwater ecosystem? (2022)
-
A.
Fish
-
B.
Algae
-
C.
Fungi
-
D.
Bacteria
Solution
Algae are the primary producers in a freshwater ecosystem as they perform photosynthesis.
Correct Answer:
B
— Algae
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Q. What is the primary producer in a terrestrial ecosystem? (2019)
-
A.
Herbivores
-
B.
Carnivores
-
C.
Plants
-
D.
Decomposers
Solution
Plants are the primary producers in terrestrial ecosystems as they convert sunlight into energy through photosynthesis.
Correct Answer:
C
— Plants
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Q. What is the primary product of nuclear fission? (2019)
-
A.
Energy
-
B.
Neutrons
-
C.
Protons
-
D.
Alpha particles
Solution
The primary product of nuclear fission is energy, along with neutrons and smaller nuclei.
Correct Answer:
A
— Energy
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Q. What is the primary product of the electrolysis of water? (2023)
-
A.
Hydrogen
-
B.
Oxygen
-
C.
Hydrogen Peroxide
-
D.
Ozone
Solution
The primary products of the electrolysis of water are hydrogen and oxygen gases.
Correct Answer:
A
— Hydrogen
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Q. What is the primary product of the fission of Uranium-235? (2019)
-
A.
Helium
-
B.
Neutrons
-
C.
Barium and Krypton
-
D.
Carbon
Solution
The fission of Uranium-235 primarily produces Barium and Krypton along with additional neutrons.
Correct Answer:
C
— Barium and Krypton
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Q. What is the primary product of the fusion of hydrogen nuclei in stars? (2022)
-
A.
Helium
-
B.
Carbon
-
C.
Oxygen
-
D.
Nitrogen
Solution
The primary product of hydrogen fusion in stars is helium, which occurs through the proton-proton chain reaction.
Correct Answer:
A
— Helium
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Q. What is the primary product of the fusion of hydrogen nuclei? (2022)
-
A.
Helium
-
B.
Carbon
-
C.
Oxygen
-
D.
Deuterium
Solution
The primary product of the fusion of hydrogen nuclei (protons) is helium, along with the release of energy.
Correct Answer:
A
— Helium
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Q. What is the primary product of the reaction between hydrogen and chlorine? (2019)
-
A.
Hydrochloric acid
-
B.
Hydrogen chloride
-
C.
Chlorine gas
-
D.
Water
Solution
The primary product of the reaction between hydrogen and chlorine is hydrogen chloride (HCl).
Correct Answer:
B
— Hydrogen chloride
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Q. What is the primary product of the thermal decomposition of calcium carbonate? (2019)
-
A.
Calcium oxide
-
B.
Calcium hydroxide
-
C.
Calcium bicarbonate
-
D.
Calcium chloride
Solution
The thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2).
Correct Answer:
A
— Calcium oxide
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Q. What is the primary product when aluminum reacts with hydrochloric acid? (2020)
-
A.
AlCl3
-
B.
H2
-
C.
Al(OH)3
-
D.
Al2Cl6
Solution
When aluminum reacts with hydrochloric acid, hydrogen gas (H2) is produced along with aluminum chloride (AlCl3).
Correct Answer:
B
— H2
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Q. What is the primary product when calcium reacts with oxygen? (2022)
-
A.
Calcium oxide
-
B.
Calcium hydroxide
-
C.
Calcium carbonate
-
D.
Calcium peroxide
Solution
Calcium reacts with oxygen to form calcium oxide (CaO).
Correct Answer:
A
— Calcium oxide
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Q. What is the primary product when lithium reacts with nitrogen? (2022)
-
A.
Lithium nitride
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B.
Lithium oxide
-
C.
Lithium hydroxide
-
D.
Lithium carbonate
Solution
Lithium reacts with nitrogen to form lithium nitride (Li3N).
Correct Answer:
A
— Lithium nitride
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Q. What is the primary product when potassium permanganate (KMnO4) is reduced in acidic medium? (2019)
-
A.
MnO2
-
B.
Mn2+
-
C.
MnO4-
-
D.
KMnO4
Solution
In acidic medium, potassium permanganate (KMnO4) is reduced to Mn2+.
Correct Answer:
B
— Mn2+
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Q. What is the primary purpose of petals in a flower? (2023)
-
A.
To produce seeds
-
B.
To attract pollinators
-
C.
To support the flower
-
D.
To protect the ovary
Solution
Petals are often brightly colored and serve to attract pollinators to the flower.
Correct Answer:
B
— To attract pollinators
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Q. What is the primary purpose of reproduction in organisms? (2020)
-
A.
To increase genetic diversity
-
B.
To maintain homeostasis
-
C.
To produce energy
-
D.
To ensure survival of the species
Solution
Reproduction ensures the continuation of a species by producing offspring.
Correct Answer:
D
— To ensure survival of the species
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Q. What is the primary purpose of reproductive health education? (2020)
-
A.
To promote early marriage
-
B.
To prevent sexually transmitted diseases
-
C.
To encourage multiple partners
-
D.
To discourage family planning
Solution
Reproductive health education aims to inform individuals about safe practices, including the prevention of sexually transmitted diseases.
Correct Answer:
B
— To prevent sexually transmitted diseases
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Q. What is the primary purpose of using recombinant DNA technology in medicine? (2019)
-
A.
To create vaccines
-
B.
To produce antibiotics
-
C.
To synthesize hormones
-
D.
All of the above
Solution
Recombinant DNA technology is used to create vaccines, produce antibiotics, and synthesize hormones like insulin.
Correct Answer:
D
— All of the above
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Q. What is the primary purpose of using restriction enzymes in biotechnology? (2020)
-
A.
To amplify DNA
-
B.
To cut DNA at specific sequences
-
C.
To insert genes into plasmids
-
D.
To sequence DNA
Solution
Restriction enzymes are proteins that cut DNA at specific sequences, which is essential for cloning and genetic engineering.
Correct Answer:
B
— To cut DNA at specific sequences
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Q. What is the primary reason for the brittleness of certain materials? (2023)
-
A.
High ductility
-
B.
Low atomic bonding energy
-
C.
High atomic bonding energy
-
D.
High elasticity
Solution
Brittleness is primarily due to high atomic bonding energy, which prevents the material from deforming plastically.
Correct Answer:
C
— High atomic bonding energy
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Q. What is the primary reason for the high compressibility of gases?
-
A.
Large intermolecular spaces
-
B.
Strong intermolecular forces
-
C.
Low temperature
-
D.
High pressure
Solution
Gases are highly compressible due to large intermolecular spaces between particles.
Correct Answer:
A
— Large intermolecular spaces
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Q. What is the primary reason for the high electronegativity of halogens? (2020)
-
A.
Large atomic size
-
B.
High ionization energy
-
C.
Low electron affinity
-
D.
High atomic mass
Solution
Halogens have high electronegativity due to their high ionization energy, which allows them to attract electrons effectively.
Correct Answer:
B
— High ionization energy
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Q. What is the primary reason for the increase in human population over the last century? (2023)
-
A.
Increased birth rates
-
B.
Decreased death rates
-
C.
Improved healthcare
-
D.
All of the above
Solution
The increase in human population is attributed to a combination of increased birth rates, decreased death rates, and improved healthcare.
Correct Answer:
D
— All of the above
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Q. What is the primary reason for the increase in ionization energy across a period in p-block elements? (2023)
-
A.
Increase in atomic size
-
B.
Increase in nuclear charge
-
C.
Decrease in shielding effect
-
D.
Increase in electron affinity
Solution
The increase in nuclear charge across a period leads to higher ionization energy.
Correct Answer:
B
— Increase in nuclear charge
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Q. What is the primary reason for the phenomenon of plastic deformation in materials? (2023)
-
A.
Elastic limit
-
B.
Yield strength
-
C.
Ultimate tensile strength
-
D.
Ductility
Solution
Plastic deformation occurs when the material is subjected to stress beyond its yield strength.
Correct Answer:
B
— Yield strength
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Q. What is the primary reason for the stability of a nucleus? (2022)
-
A.
Number of protons
-
B.
Number of neutrons
-
C.
Ratio of neutrons to protons
-
D.
Size of the nucleus
Solution
The stability of a nucleus is primarily determined by the ratio of neutrons to protons, which affects the balance of forces within the nucleus.
Correct Answer:
C
— Ratio of neutrons to protons
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Q. What is the primary reason for the use of soft iron in electromagnets? (2023)
-
A.
High electrical conductivity
-
B.
Low cost
-
C.
High magnetic permeability
-
D.
Low density
Solution
Soft iron is used in electromagnets because it has high magnetic permeability, allowing it to be easily magnetized and demagnetized.
Correct Answer:
C
— High magnetic permeability
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Q. What is the primary reason for the variable oxidation states of transition metals?
-
A.
Presence of d-electrons
-
B.
High atomic mass
-
C.
Low ionization energy
-
D.
High electronegativity
Solution
The presence of d-electrons allows transition metals to exhibit variable oxidation states.
Correct Answer:
A
— Presence of d-electrons
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Q. What is the primary reason that gases can be compressed more than liquids or solids?
-
A.
High density
-
B.
Low density
-
C.
Large intermolecular spaces
-
D.
Strong intermolecular forces
Solution
Gases can be compressed more than liquids or solids because they have large intermolecular spaces.
Correct Answer:
C
— Large intermolecular spaces
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Q. What is the primary role of auxins in apical dominance? (2019)
-
A.
Promote lateral bud growth
-
B.
Inhibit lateral bud growth
-
C.
Stimulate root growth
-
D.
Enhance leaf expansion
Solution
Auxins inhibit the growth of lateral buds, maintaining apical dominance and directing growth towards the apex.
Correct Answer:
B
— Inhibit lateral bud growth
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