Undergraduate
Q. Which of the following is a characteristic of a stable ecosystem? (2023)
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A.
High biodiversity
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B.
Low productivity
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C.
Limited interactions
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D.
Constant change
Solution
High biodiversity is a characteristic of a stable ecosystem, as it enhances resilience and stability.
Correct Answer: A — High biodiversity
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Q. Which of the following is a characteristic of a Zener diode? (2019)
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A.
Used for rectification
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B.
Operates in reverse bias
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C.
Has a high forward voltage drop
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D.
Acts as a switch
Solution
A Zener diode is designed to operate in reverse bias and maintain a constant voltage.
Correct Answer: B — Operates in reverse bias
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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 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 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
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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
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B.
Rigid
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C.
Elastic
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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 oils? (2019)
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A.
Water-soluble
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B.
Volatile
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C.
Non-toxic
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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 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
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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 genetically modified organisms (GMOs)? (2023)
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A.
They are always harmful to the environment
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B.
They contain genes from other species
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C.
They cannot reproduce
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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
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C.
Stimulation of leaf senescence
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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
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C.
Low density
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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 meristematic tissue? (2022)
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A.
It is differentiated
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B.
It has the ability to divide
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C.
It is dead
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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)
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A.
Occurs at low pressures only
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B.
Described by the Langmuir isotherm
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C.
Described by the BET theory
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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 organic compounds? (2021)
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A.
They contain carbon
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B.
They are always solid
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C.
They are ionic
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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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Q. Which of the following is a characteristic of p-type semiconductors? (2022)
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A.
Excess electrons
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B.
Excess holes
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C.
High conductivity
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D.
Low melting point
Solution
P-type semiconductors have an excess of holes as majority charge carriers.
Correct Answer: B — Excess holes
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Q. Which of the following is a characteristic of pathogenic microbes? (2019)
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A.
They are always beneficial
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B.
They can cause diseases
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C.
They are used in food production
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D.
They are harmless
Solution
Pathogenic microbes are those that can cause diseases in humans, animals, or plants.
Correct Answer: B — They can cause diseases
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Q. Which of the following is a characteristic of phototropism? (2019)
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A.
Growth towards light
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B.
Growth away from light
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C.
Uniform growth in all directions
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D.
Growth in response to gravity
Solution
Phototropism is the growth of a plant towards light, facilitated by auxins.
Correct Answer: A — Growth towards light
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Q. Which of the following is a characteristic of probiotics? (2022)
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A.
They are harmful bacteria
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B.
They promote gut health
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C.
They cause infections
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D.
They are not found in food
Solution
Probiotics are beneficial bacteria that promote gut health and are often found in fermented foods.
Correct Answer: B — They promote gut health
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Q. Which of the following is a characteristic of prokaryotic cells? (2022)
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A.
Membrane-bound organelles
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B.
Nucleus
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C.
Circular DNA
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D.
Multicellular
Solution
Prokaryotic cells have circular DNA and lack membrane-bound organelles.
Correct Answer: C — Circular DNA
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Q. Which of the following is a characteristic of the kingdom Animalia? (2021)
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A.
Cell walls
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B.
Autotrophic nutrition
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C.
Multicellular and heterotrophic
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D.
Chlorophyll
Solution
The kingdom Animalia consists of multicellular and heterotrophic organisms.
Correct Answer: C — Multicellular and heterotrophic
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Q. Which of the following is a characteristic of the kingdom Plantae? (2022)
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A.
Heterotrophic
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B.
Cellulose in cell walls
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C.
Unicellular
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D.
Motile
Solution
Plants are characterized by having cellulose in their cell walls.
Correct Answer: B — Cellulose in cell walls
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Q. Which of the following is a characteristic of the phylum Annelida? (2023)
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A.
Body is segmented
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B.
Presence of a shell
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C.
Radial symmetry
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D.
Exoskeleton
Solution
Annelida, or segmented worms, are characterized by their segmented bodies.
Correct Answer: A — Body is segmented
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