Q. Which of the following is a potential risk associated with genetically modified crops? (2021)
-
A.
Increased biodiversity
-
B.
Development of resistant pests
-
C.
Higher nutritional value
-
D.
Lower production costs
Solution
One potential risk of genetically modified crops is the development of resistant pests, which can lead to increased agricultural challenges.
Correct Answer:
B
— Development of resistant pests
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Q. Which of the following is a potential risk associated with the use of biotechnology in agriculture? (2022)
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A.
Increased food production
-
B.
Development of resistant pests
-
C.
Improved nutritional value
-
D.
Lower environmental impact
Solution
One potential risk is the development of resistant pests, which can lead to increased pesticide use.
Correct Answer:
B
— Development of resistant pests
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Q. Which of the following is a potential risk associated with the use of GMOs? (2019)
-
A.
Increased biodiversity
-
B.
Development of resistant pests
-
C.
Higher nutritional value
-
D.
Lower environmental impact
Solution
A potential risk associated with the use of GMOs is the development of resistant pests, which can lead to increased pesticide use.
Correct Answer:
B
— Development of resistant pests
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Q. Which of the following is a practical application of electromagnetic induction? (2019)
-
A.
Electric generator
-
B.
Resistor
-
C.
Capacitor
-
D.
Diode
Solution
Electric generators utilize electromagnetic induction to convert mechanical energy into electrical energy.
Correct Answer:
A
— Electric generator
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Q. Which of the following is a primary alcohol? (2020) 2020
-
A.
2-Propanol
-
B.
1-Butanol
-
C.
Cyclohexanol
-
D.
2-Pentanol
Solution
1-Butanol has the hydroxyl group (-OH) attached to a primary carbon, making it a primary alcohol.
Correct Answer:
B
— 1-Butanol
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Q. Which of the following is a primary alcohol? (2022) 2022
-
A.
1-butanol
-
B.
2-butanol
-
C.
tert-butanol
-
D.
cyclohexanol
Solution
1-butanol has the hydroxyl group (-OH) attached to a primary carbon atom, making it a primary alcohol.
Correct Answer:
A
— 1-butanol
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Q. Which of the following is a primary amine? (2022) 2022
-
A.
Ethylamine
-
B.
Dimethylamine
-
C.
Trimethylamine
-
D.
Aniline
Solution
Ethylamine (C2H5NH2) is a primary amine as it has one alkyl group attached to the nitrogen atom.
Correct Answer:
A
— Ethylamine
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Q. Which of the following is a primary cell? (2023) 2023
-
A.
Lead-acid battery
-
B.
Nickel-cadmium battery
-
C.
Zinc-carbon battery
-
D.
Lithium-ion battery
Solution
The zinc-carbon battery is a type of primary cell, which cannot be recharged.
Correct Answer:
C
— Zinc-carbon battery
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Q. Which of the following is a primary function of the phloem? (2023)
-
A.
Transport of water
-
B.
Transport of nutrients
-
C.
Transport of food
-
D.
Storage of water
Solution
Phloem is responsible for the transport of food, primarily in the form of sucrose, from the leaves to other parts of the plant.
Correct Answer:
C
— Transport of food
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Q. Which of the following is a primary producer in an ecosystem? (2022)
-
A.
Herbivores
-
B.
Carnivores
-
C.
Plants
-
D.
Decomposers
Solution
Primary producers, such as plants, convert solar energy into chemical energy through photosynthesis.
Correct Answer:
C
— Plants
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Q. Which of the following is a product of biotechnology used in agriculture? (2019)
-
A.
Insulin
-
B.
Bt cotton
-
C.
Human growth hormone
-
D.
Vaccines
Solution
Bt cotton is a genetically modified organism (GMO) that has been engineered to express a bacterial toxin, making it resistant to certain pests.
Correct Answer:
B
— Bt cotton
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Q. Which of the following is a product of microbial fermentation? (2022)
-
A.
Antibiotics
-
B.
Vitamins
-
C.
Alcohol
-
D.
All of the above
Solution
Microbial fermentation can produce antibiotics, vitamins, and alcohol, among other products.
Correct Answer:
D
— All of the above
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Q. Which of the following is a prokaryotic cell? (2022)
-
A.
Plant cell
-
B.
Animal cell
-
C.
Bacterial cell
-
D.
Fungal cell
Solution
Bacterial cells are prokaryotic, meaning they lack a defined nucleus and membrane-bound organelles.
Correct Answer:
C
— Bacterial cell
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Q. Which of the following is a prokaryotic organism? (2022)
-
A.
Fungi
-
B.
Bacteria
-
C.
Plants
-
D.
Animals
Solution
Bacteria are prokaryotic organisms, which means they lack a defined nucleus and membrane-bound organelles.
Correct Answer:
B
— Bacteria
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Q. Which of the following is a property of actinides? (2020)
-
A.
All are radioactive
-
B.
All are non-metals
-
C.
All are stable
-
D.
All are found in nature
Solution
All actinides are radioactive, with many being synthetic and unstable.
Correct Answer:
A
— All are radioactive
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Q. Which of the following is a property of addition polymers? (2022)
-
A.
They are formed by the elimination of small molecules
-
B.
They have a high degree of crystallinity
-
C.
They are formed from unsaturated monomers
-
D.
They are always biodegradable
Solution
Addition polymers are formed from unsaturated monomers through addition reactions.
Correct Answer:
C
— They are formed from unsaturated monomers
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Q. Which of the following is a property of aldehydes? (2023)
-
A.
They are generally more reactive than ketones
-
B.
They do not undergo oxidation
-
C.
They are less soluble in water than ketones
-
D.
They have higher boiling points than alcohols
Solution
Aldehydes are generally more reactive than ketones due to the presence of the hydrogen atom attached to the carbonyl carbon.
Correct Answer:
A
— They are generally more reactive than ketones
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Q. Which of the following is a property of amorphous solids? (2023)
-
A.
Anisotropic
-
B.
Isotropic
-
C.
Definite melting point
-
D.
Ordered structure
Solution
Amorphous solids are isotropic, meaning their properties are the same in all directions, unlike crystalline solids.
Correct Answer:
B
— Isotropic
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Q. Which of the following is a property of covalent network solids? (2023)
-
A.
Good electrical conductors
-
B.
High melting points
-
C.
Malleable
-
D.
Soluble in water
Solution
Covalent network solids, such as diamond, have very high melting points due to the strong covalent bonds throughout the structure.
Correct Answer:
B
— High melting points
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Q. Which of the following is a property of electric field lines? (2023)
-
A.
They can be broken
-
B.
They can be created
-
C.
They can be destroyed
-
D.
They cannot intersect
Solution
Electric field lines cannot intersect because it would imply two different directions of the electric field at a point.
Correct Answer:
D
— They cannot intersect
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Q. Which of the following is a property of ethers? (2020)
-
A.
High boiling point
-
B.
Soluble in water
-
C.
Flammable
-
D.
Non-polar
Solution
Ethers are generally flammable due to their hydrocarbon nature, although they have moderate boiling points.
Correct Answer:
C
— Flammable
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Q. Which of the following is a property of halogens? (2021) 2021
-
A.
They are all metals
-
B.
They have low electronegativity
-
C.
They form diatomic molecules
-
D.
They are colorless gases
Solution
Halogens exist as diatomic molecules (e.g., Cl2, F2).
Correct Answer:
C
— They form diatomic molecules
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Q. Which of the following is a property of intrinsic semiconductors? (2023)
-
A.
Doped with impurities
-
B.
High conductivity
-
C.
Pure form
-
D.
Low melting point
Solution
Intrinsic semiconductors are in their pure form without any doping.
Correct Answer:
C
— Pure form
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Q. Which of the following is a property of ketones? (2020)
-
A.
More reactive than aldehydes
-
B.
Less polar than aldehydes
-
C.
Higher boiling points than aldehydes
-
D.
None of the above
Solution
Ketones are generally less polar than aldehydes due to the absence of a hydrogen atom attached to the carbonyl carbon.
Correct Answer:
B
— Less polar than aldehydes
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Q. Which of the following is a purine? (2019)
-
A.
Cytosine
-
B.
Thymine
-
C.
Adenine
-
D.
Uracil
Solution
Adenine is a purine, which is one of the two types of nitrogenous bases in nucleic acids.
Correct Answer:
C
— Adenine
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Q. Which of the following is a reducing agent in the reaction 2MnO4- + 5C2O4^2- + 16H+ → 2Mn^2+ + 10CO2 + 8H2O? (2020)
-
A.
MnO4-
-
B.
C2O4^2-
-
C.
H+
-
D.
CO2
Solution
C2O4^2- (oxalate ion) is oxidized to CO2, thus it acts as a reducing agent in this reaction.
Correct Answer:
B
— C2O4^2-
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Q. Which of the following is a role of microbes in agriculture? (2021)
-
A.
Nitrogen fixation
-
B.
Soil erosion
-
C.
Pest infestation
-
D.
Plant diseases
Solution
Microbes, particularly certain bacteria, play a vital role in nitrogen fixation, which is essential for plant growth.
Correct Answer:
A
— Nitrogen fixation
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Q. Which of the following is a role of yeast in human welfare? (2020)
-
A.
Causing infections
-
B.
Producing alcohol
-
C.
Decomposing waste
-
D.
None of the above
Solution
Yeast, particularly Saccharomyces cerevisiae, is used in the production of alcohol through fermentation.
Correct Answer:
B
— Producing alcohol
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Q. Which of the following is a saturated carboxylic acid?
-
A.
Hexanoic acid
-
B.
Hexenoic acid
-
C.
Cyclohexanoic acid
-
D.
Benzoic acid
Solution
Hexanoic acid is a saturated carboxylic acid.
Correct Answer:
A
— Hexanoic acid
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Q. Which of the following is a saturated fatty acid?
-
A.
Oleic acid
-
B.
Stearic acid
-
C.
Linoleic acid
-
D.
Palmitoleic acid
Solution
Stearic acid is a saturated fatty acid, meaning it has no double bonds between carbon atoms.
Correct Answer:
B
— Stearic acid
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