Q. Which of the following is a characteristic of addition polymers? (2019)
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A.
Formed by condensation
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B.
Involves the elimination of small molecules
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C.
Monomers have double bonds
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D.
Decomposes easily
Solution
Addition polymers are formed from monomers that contain double bonds, which open up to form long chains.
Correct Answer: C — Monomers have double bonds
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Q. Which of the following is a characteristic of adsorption? (2023)
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A.
It is a bulk phenomenon.
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B.
It is a surface phenomenon.
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C.
It occurs at high temperatures only.
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D.
It is always exothermic.
Solution
Adsorption is a surface phenomenon, as it occurs at the interface between phases.
Correct Answer: B — It is a surface phenomenon.
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Q. Which of the following is a characteristic of algae? (2019)
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A.
They are all terrestrial
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B.
They are autotrophic
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C.
They have true roots
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D.
They are vascular plants
Solution
Algae are primarily autotrophic organisms that can perform photosynthesis.
Correct Answer: B — They are autotrophic
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Q. Which of the following is a characteristic of all living organisms? (2023)
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A.
Ability to photosynthesize
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B.
Ability to move from one place to another
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C.
Ability to respond to stimuli
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D.
Ability to produce heat
Solution
The ability to respond to stimuli is a characteristic of all living organisms, allowing them to interact with their environment.
Correct Answer: C — Ability to respond to stimuli
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Q. Which of the following is a characteristic of aromatic hydrocarbons? (2023)
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A.
They are saturated
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B.
They have a pleasant smell
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C.
They are highly reactive
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D.
They contain double bonds only
Solution
Aromatic hydrocarbons are known for their pleasant smell and contain a stable ring structure.
Correct Answer: B — They have a pleasant smell
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Q. Which of the following is a characteristic of asexual reproduction? (2019)
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A.
Involves two parents
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B.
Produces genetically identical offspring
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C.
Requires gametes
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D.
Occurs in higher organisms only
Solution
Asexual reproduction produces genetically identical offspring from a single parent.
Correct Answer: B — Produces genetically identical offspring
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Q. Which of the following is a characteristic of brittle materials? (2020)
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A.
High ductility
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B.
Low tensile strength
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C.
Low elasticity
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D.
Fracture without significant deformation
Solution
Brittle materials fracture without significant deformation.
Correct Answer: D — Fracture without significant deformation
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Q. Which of the following is a characteristic of bryophytes? (2019)
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A.
Presence of true roots
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B.
Presence of xylem and phloem
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C.
Moist habitats
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D.
All of the above
Solution
Bryophytes are typically found in moist habitats and do not have true roots, xylem, or phloem.
Correct Answer: C — Moist habitats
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Q. Which of the following is a characteristic of complete flowers? (2022)
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A.
Lack of sepals
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B.
Presence of both male and female parts
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C.
Only male parts
-
D.
Only female parts
Solution
Complete flowers have all four whorls: sepals, petals, stamens, and carpels.
Correct Answer: B — Presence of both male and female parts
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Q. Which of the following is a characteristic of cross-linked polymers? (2023)
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A.
Flexible
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B.
Linear structure
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C.
High melting point
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D.
Low tensile strength
Solution
Cross-linked polymers have a three-dimensional network structure, which gives them a high melting point and strength.
Correct Answer: C — High melting point
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Q. Which of the following is a characteristic of dicots? (2022)
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A.
Single cotyledon
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B.
Net-like leaf venation
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C.
Scattered vascular bundles
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D.
Fibrous root system
Solution
Dicots are characterized by having net-like leaf venation and two cotyledons.
Correct Answer: B — Net-like leaf venation
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Q. Which of the following is a characteristic of dicotyledons? (2019)
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A.
Two cotyledons
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B.
Parallel venation
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C.
Fibrous root system
-
D.
Single flower part
Solution
Dicotyledons are characterized by having two cotyledons in their seeds.
Correct Answer: A — Two cotyledons
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Q. Which of the following is a characteristic of elastic materials? (2023)
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A.
They return to original shape after deformation
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B.
They permanently deform
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C.
They break easily
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D.
They are always brittle
Solution
Elastic materials return to their original shape after the removal of the applied force.
Correct Answer: A — They return to original shape after deformation
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Q. Which of the following is a characteristic of elastomers?
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A.
Brittle
-
B.
Rigid
-
C.
Elastic
-
D.
Conductive
Solution
Elastomers are known for their elastic properties, allowing them to stretch and return to their original shape.
Correct Answer: C — Elastic
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Q. Which of the following is a characteristic of essential amino acids? (2019)
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A.
Can be synthesized by the body
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B.
Must be obtained from diet
-
C.
Are not required for protein synthesis
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D.
Are only found in animal products
Solution
Essential amino acids cannot be synthesized by the body and must be obtained through the diet.
Correct Answer: B — Must be obtained from diet
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Q. Which of the following is a characteristic of essential oils? (2019)
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A.
Water-soluble
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B.
Volatile
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C.
Non-toxic
-
D.
All of the above
Solution
Essential oils are volatile compounds that are often used for their aromatic properties and therapeutic benefits.
Correct Answer: B — Volatile
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Q. Which of the following is a characteristic of ethers? (2019)
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A.
Higher boiling point than alcohols
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B.
Lower boiling point than alcohols
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C.
Soluble in water
-
D.
Flammable
Solution
Ethers generally have lower boiling points than alcohols due to the absence of hydrogen bonding.
Correct Answer: B — Lower boiling point than alcohols
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Q. Which of the following is a characteristic of eukaryotic cells? (2019)
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A.
No nucleus
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B.
Circular DNA
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C.
Membrane-bound organelles
-
D.
Binary fission
Solution
Eukaryotic cells are characterized by the presence of membrane-bound organelles, including a nucleus.
Correct Answer: C — Membrane-bound organelles
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Q. Which of the following is a characteristic of eukaryotic genes? (2023)
-
A.
They are polycistronic
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B.
They contain introns
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C.
They lack regulatory sequences
-
D.
They are circular
Solution
Eukaryotic genes often contain introns, which are non-coding sequences that are removed during RNA processing.
Correct Answer: B — They contain introns
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Q. Which of the following is a characteristic of genetically modified organisms (GMOs)? (2023)
-
A.
They are always harmful to the environment
-
B.
They contain genes from other species
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C.
They cannot reproduce
-
D.
They are not regulated by any laws
Solution
GMOs are organisms whose genetic material has been altered using genetic engineering techniques, often incorporating genes from other species.
Correct Answer: B — They contain genes from other species
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Q. Which of the following is a characteristic of gibberellins? (2019)
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A.
Inhibition of seed germination
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B.
Promotion of flowering
-
C.
Stimulation of leaf senescence
-
D.
Inhibition of stem elongation
Solution
Gibberellins promote flowering and are also involved in seed germination and stem elongation.
Correct Answer: B — Promotion of flowering
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Q. Which of the following is a characteristic of ionic solids? (2020)
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A.
High electrical conductivity in solid state
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B.
High melting point
-
C.
Low density
-
D.
Malleable
Solution
Ionic solids are characterized by high melting points due to the strong electrostatic forces between the ions.
Correct Answer: B — High melting point
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Q. Which of the following is a characteristic of isomers? (2022)
-
A.
Same molecular formula
-
B.
Different molecular formula
-
C.
Same physical properties
-
D.
Same structural formula
Solution
Isomers have the same molecular formula but different structural or spatial arrangements.
Correct Answer: A — Same molecular formula
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Q. Which of the following is a characteristic of life? (2022)
-
A.
Ability to evolve
-
B.
Ability to freeze
-
C.
Ability to dissolve
-
D.
Ability to float
Solution
The ability to evolve is a characteristic of life, allowing organisms to adapt to their environment over generations.
Correct Answer: A — Ability to evolve
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Q. Which of the following is a characteristic of living organisms? (2022)
-
A.
They can exist in isolation
-
B.
They can evolve
-
C.
They do not require energy
-
D.
They cannot adapt
Solution
Living organisms can evolve over time, which is a fundamental characteristic of life.
Correct Answer: B — They can evolve
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Q. Which of the following is a characteristic of meristematic tissue? (2022)
-
A.
It is differentiated
-
B.
It has the ability to divide
-
C.
It is dead
-
D.
It is found in mature tissues
Solution
Meristematic tissue is characterized by its ability to divide and give rise to various types of plant tissues.
Correct Answer: B — It has the ability to divide
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Q. Which of the following is a characteristic of multilayer adsorption? (2019)
-
A.
Occurs at low pressures only
-
B.
Described by the Langmuir isotherm
-
C.
Described by the BET theory
-
D.
Involves only physical adsorption
Solution
Multilayer adsorption is described by the BET theory, which accounts for the formation of multiple layers of adsorbate on the adsorbent.
Correct Answer: C — Described by the BET theory
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Q. Which of the following is a characteristic of nuclear fusion? (2023)
-
A.
Releases energy
-
B.
Requires high temperature
-
C.
Occurs in stars
-
D.
All of the above
Solution
Nuclear fusion releases energy, requires high temperatures, and occurs in stars, making all options correct.
Correct Answer: D — All of the above
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Q. Which of the following is a characteristic of nuclear reactions compared to chemical reactions? (2023)
-
A.
Involves electrons
-
B.
Involves large energy changes
-
C.
Involves only valence electrons
-
D.
Involves breaking of chemical bonds
Solution
Nuclear reactions involve large energy changes due to the conversion of mass into energy, unlike chemical reactions.
Correct Answer: B — Involves large energy changes
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Q. Which of the following is a characteristic of organic compounds? (2021)
-
A.
They contain carbon
-
B.
They are always solid
-
C.
They are ionic
-
D.
They do not burn
Solution
Organic compounds are primarily characterized by the presence of carbon atoms in their structure.
Correct Answer: A — They contain carbon
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