Undergraduate
Q. Which of the following animals is classified under phylum Chordata? (2019)
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A.
Earthworm
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B.
Cockroach
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C.
Shark
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D.
Starfish
Solution
Phylum Chordata includes animals that possess a notochord at some stage of their development, such as sharks.
Correct Answer: C — Shark
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Q. Which of the following best describes a climax community? (2018)
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A.
A community that is in a state of constant change.
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B.
A stable community that has reached a steady state.
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C.
A community that is dominated by pioneer species.
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D.
A community that is always changing due to disturbances.
Solution
A climax community is a stable and mature ecological community that has reached a steady state.
Correct Answer: B — A stable community that has reached a steady state.
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Q. Which of the following best describes a food web? (2023)
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A.
A linear sequence of energy transfer
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B.
A complex network of feeding relationships
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C.
A diagram showing only producers
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D.
A representation of energy loss
Solution
A food web is a complex network of feeding relationships that illustrates how different organisms are interconnected in an ecosystem.
Correct Answer: B — A complex network of feeding relationships
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Q. Which of the following best describes a trophic level? (2023)
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A.
A group of organisms that share the same habitat
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B.
A level in a food chain or food web
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C.
The total biomass of an ecosystem
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D.
The number of species in an ecosystem
Solution
A trophic level refers to the position an organism occupies in a food chain or food web, indicating its role in energy transfer.
Correct Answer: B — A level in a food chain or food web
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Q. Which of the following best describes adaptive radiation? (2012)
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A.
Rapid evolution of many species from a common ancestor
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B.
Evolution of similar traits in unrelated species
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C.
Gradual change in a species over time
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D.
Extinction of species due to environmental changes
Solution
Adaptive radiation refers to the rapid evolution of many species from a common ancestor, often in response to new environmental opportunities.
Correct Answer: A — Rapid evolution of many species from a common ancestor
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Q. Which of the following best describes genetic drift? (2022)
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A.
Change in allele frequencies due to random sampling
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B.
Change in allele frequencies due to natural selection
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C.
Change in allele frequencies due to mutation
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D.
Change in allele frequencies due to gene flow
Solution
Genetic drift refers to random changes in allele frequencies in a population, often having a more significant effect in small populations.
Correct Answer: A — Change in allele frequencies due to random sampling
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Q. Which of the following best describes the arrangement of particles in a liquid? (2023)
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A.
Random and far apart
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B.
Close together and fixed
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C.
Close together but can move past each other
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D.
Random and tightly packed
Solution
In liquids, particles are close together but can move past each other, allowing liquids to flow.
Correct Answer: C — Close together but can move past each other
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Q. Which of the following best describes the behavior of gases according to the kinetic molecular theory? (2019)
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A.
Particles are tightly packed
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B.
Particles are in fixed positions
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C.
Particles are in constant random motion
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D.
Particles have strong intermolecular forces
Solution
According to the kinetic molecular theory, gas particles are in constant random motion.
Correct Answer: C — Particles are in constant random motion
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Q. Which of the following best describes the concept of 'survival of the fittest'?
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A.
Only the strongest survive
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B.
The most adaptable survive
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C.
The fastest survive
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D.
The largest survive
Solution
'Survival of the fittest' refers to the idea that those individuals best adapted to their environment are more likely to survive and reproduce.
Correct Answer: B — The most adaptable survive
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Q. Which of the following best describes the particles in a gas? (2015)
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A.
Tightly packed and vibrating
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B.
Close together and sliding past each other
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C.
Far apart and moving freely
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D.
Fixed in place
Solution
In gases, particles are far apart and move freely, allowing them to fill the container they are in.
Correct Answer: C — Far apart and moving freely
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Q. Which of the following best describes the process of adaptive radiation? (1959)
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A.
Rapid evolution of many species from a common ancestor
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B.
Evolution of similar traits in unrelated species
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C.
Gradual change in a species over time
-
D.
Extinction of species due to environmental changes
Solution
Adaptive radiation refers to the rapid evolution of many species from a common ancestor, often in response to new environmental opportunities.
Correct Answer: A — Rapid evolution of many species from a common ancestor
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Q. Which of the following best describes the term 'carrying capacity'? (2020)
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A.
The maximum population size that an environment can sustain
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B.
The minimum population size for survival
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C.
The average population size over time
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D.
The population size at which birth rates equal death rates
Solution
Carrying capacity refers to the maximum population size that an environment can sustainably support.
Correct Answer: A — The maximum population size that an environment can sustain
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Q. Which of the following biomolecules is primarily responsible for genetic information? (2021)
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A.
Proteins
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B.
Carbohydrates
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C.
Nucleic acids
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D.
Lipids
Solution
Nucleic acids, such as DNA and RNA, carry genetic information.
Correct Answer: C — Nucleic acids
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Q. Which of the following carboxylic acids has a pungent odor? (2022)
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A.
Acetic acid
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B.
Butanoic acid
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C.
Formic acid
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D.
Propanoic acid
Solution
Butanoic acid has a pungent odor, often described as rancid butter.
Correct Answer: B — Butanoic acid
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Q. Which of the following carboxylic acids has the highest boiling point? (2020)
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A.
Formic acid
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B.
Acetic acid
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C.
Propanoic acid
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D.
Butanoic acid
Solution
Butanoic acid has the highest boiling point due to its longer carbon chain and greater molecular weight.
Correct Answer: D — Butanoic acid
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Q. Which of the following changes will NOT affect the position of equilibrium in a chemical reaction?
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A.
Changing the concentration of reactants
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B.
Changing the temperature
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C.
Adding a catalyst
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D.
Changing the pressure
Solution
Adding a catalyst speeds up the rate of both the forward and reverse reactions equally, thus it does not affect the position of equilibrium.
Correct Answer: C — Adding a catalyst
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Q. Which of the following classes of animals is known for having scales? (2023)
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A.
Amphibia
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B.
Reptilia
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C.
Mammalia
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D.
Aves
Solution
Reptiles are known for having scales that protect their bodies and reduce water loss.
Correct Answer: B — Reptilia
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Q. Which of the following classifications is the most inclusive? (2019)
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A.
Species
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B.
Genus
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C.
Family
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D.
Kingdom
Solution
Kingdom is the most inclusive classification among the options provided, encompassing a large group of related organisms.
Correct Answer: D — Kingdom
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Q. Which of the following complexes exhibits geometrical isomerism? (2022) 2022
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A.
[CoCl2(NH3)4]+
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B.
[Ni(CO)4]
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C.
[CuCl2(NH3)2]
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D.
[Zn(NH3)4]2+
Solution
[CoCl2(NH3)4]+ can exhibit geometrical isomerism due to the different arrangements of ligands around the cobalt ion.
Correct Answer: A — [CoCl2(NH3)4]+
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Q. Which of the following complexes is paramagnetic? (2023) 2023
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A.
[Ni(CN)4]2-
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B.
[Fe(H2O)6]3+
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C.
[Cu(NH3)4]2+
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D.
[Zn(NH3)4]2+
Solution
[Fe(H2O)6]3+ has unpaired electrons, making it paramagnetic, while the others have all paired electrons.
Correct Answer: B — [Fe(H2O)6]3+
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Q. Which of the following compounds can be prepared by the reduction of nitrobenzene? (2022)
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A.
Aniline
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B.
Benzylamine
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C.
Ethylamine
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D.
Methylamine
Solution
Nitrobenzene can be reduced to aniline using reducing agents like Sn/HCl.
Correct Answer: A — Aniline
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Q. Which of the following compounds can be used to distinguish between primary, secondary, and tertiary amines? (2023)
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A.
Bromine water
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B.
Nitrous acid
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C.
Sodium hydroxide
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D.
Hydrochloric acid
Solution
Nitrous acid can be used to distinguish between primary, secondary, and tertiary amines, as it reacts differently with each type.
Correct Answer: B — Nitrous acid
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Q. Which of the following compounds contains a carboxylic acid functional group? (2021)
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A.
C2H5OH
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B.
C3H6O
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C.
C2H4COOH
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D.
C4H10
Solution
C2H4COOH (acetic acid) contains the carboxylic acid functional group (-COOH).
Correct Answer: C — C2H4COOH
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Q. Which of the following compounds contains a coordinate bond? (2023)
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A.
NH3
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B.
H2O
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C.
CO
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D.
NaCl
Solution
Carbon monoxide (CO) contains a coordinate bond between carbon and oxygen.
Correct Answer: C — CO
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Q. Which of the following compounds contains a double bond? (2023)
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A.
H2O
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B.
CO2
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C.
NH3
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D.
CH4
Solution
Carbon dioxide (CO2) contains double bonds between carbon and oxygen.
Correct Answer: B — CO2
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Q. Which of the following compounds contains a p-block element? (2022) 2022
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A.
NaCl
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B.
MgO
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C.
SiO2
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D.
Fe2O3
Solution
Silicon dioxide (SiO2) contains silicon, which is a p-block element.
Correct Answer: C — SiO2
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Q. Which of the following compounds contains hydrogen in a negative oxidation state? (2021)
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A.
HCl
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B.
NaH
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C.
H2O
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D.
NH3
Solution
In sodium hydride (NaH), hydrogen has an oxidation state of -1.
Correct Answer: B — NaH
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Q. Which of the following compounds has a dipole moment? (2023)
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A.
CO2
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B.
CH4
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C.
HCl
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D.
CCl4
Solution
HCl has a dipole moment because it is a polar molecule with a significant difference in electronegativity between hydrogen and chlorine.
Correct Answer: C — HCl
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Q. Which of the following compounds is a common oxidation state of vanadium? (2022)
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A.
V2O5
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B.
VO
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C.
V2O3
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D.
All of the above
Solution
All the listed compounds represent common oxidation states of vanadium: +5 in V2O5, +2 in VO, and +3 in V2O3.
Correct Answer: D — All of the above
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Q. Which of the following compounds is a hydrogen halide? (2022)
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A.
H2O
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B.
NH3
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C.
HCl
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D.
CH4
Solution
Hydrogen chloride (HCl) is a hydrogen halide, which is a binary compound of hydrogen and a halogen.
Correct Answer: C — HCl
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