Q. Which of the following is a characteristic of aromatic hydrocarbons? (2023)
-
A.
They are saturated
-
B.
They have a pleasant smell
-
C.
They are highly reactive
-
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)
-
A.
Involves two parents
-
B.
Produces genetically identical offspring
-
C.
Requires gametes
-
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 bases?
-
A.
Taste sour
-
B.
Turn litmus red
-
C.
Feel slippery
-
D.
Release H+ ions
Solution
Bases feel slippery and can turn litmus paper blue.
Correct Answer:
C
— Feel slippery
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Q. Which of the following is a characteristic of beta decay?
-
A.
Emission of alpha particles
-
B.
Conversion of a neutron into a proton
-
C.
Emission of gamma rays
-
D.
No change in atomic number
Solution
In beta decay, a neutron is converted into a proton, resulting in an increase in atomic number by one.
Correct Answer:
B
— Conversion of a neutron into a proton
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Q. Which of the following is a characteristic of brittle materials? (2020)
-
A.
High ductility
-
B.
Low tensile strength
-
C.
Low elasticity
-
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)
-
A.
Presence of true roots
-
B.
Presence of xylem and phloem
-
C.
Moist habitats
-
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 carbohydrates?
-
A.
High energy density
-
B.
Soluble in organic solvents
-
C.
Hydrophilic nature
-
D.
Insoluble in water
Solution
Carbohydrates are generally hydrophilic, meaning they are soluble in water.
Correct Answer:
C
— Hydrophilic nature
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Q. Which of the following is a characteristic of cellulose?
-
A.
Soluble in water
-
B.
Composed of glucose units
-
C.
Used for energy storage
-
D.
Contains α-1,4 glycosidic bonds
Solution
Cellulose is composed of glucose units linked by β-1,4 glycosidic bonds and is not soluble in water.
Correct Answer:
B
— Composed of glucose units
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Q. Which of the following is a characteristic of chemisorption?
-
A.
Reversible process
-
B.
Low heat of adsorption
-
C.
Specificity to adsorbate
-
D.
Occurs at low temperatures
Solution
Chemisorption is characterized by its specificity to adsorbate due to the formation of chemical bonds.
Correct Answer:
C
— Specificity to adsorbate
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Q. Which of the following is a characteristic of cis-trans isomers?
-
A.
Same connectivity, different spatial arrangement
-
B.
Different connectivity
-
C.
Same molecular formula, different molecular weight
-
D.
Different boiling points only
Solution
Cis-trans isomers have the same connectivity but differ in the spatial arrangement of groups around a double bond.
Correct Answer:
A
— Same connectivity, different spatial arrangement
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Q. Which of the following is a characteristic of complete flowers? (2022)
-
A.
Lack of sepals
-
B.
Presence of both male and female parts
-
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 composite numbers?
-
A.
They have exactly two distinct positive divisors.
-
B.
They are greater than 1.
-
C.
They cannot be expressed as a product of two smaller natural numbers.
-
D.
They are always odd.
Solution
Composite numbers are defined as natural numbers greater than 1 that are not prime, meaning they have more than two distinct positive divisors.
Correct Answer:
B
— They are greater than 1.
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Q. Which of the following is a characteristic of covalent compounds? (2019)
-
A.
High melting points
-
B.
Conduct electricity in solution
-
C.
Low melting points
-
D.
Brittle
Solution
Covalent compounds generally have low melting points and do not conduct electricity in solution.
Correct Answer:
C
— Low melting points
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Q. Which of the following is a characteristic of cross-linked polymers? (2023)
-
A.
Flexible
-
B.
Linear structure
-
C.
High melting point
-
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 cycloalkanes?
-
A.
They are always aromatic
-
B.
They have a ring structure
-
C.
They are unsaturated
-
D.
They contain only single bonds
Solution
Cycloalkanes have a ring structure and can be saturated or unsaturated.
Correct Answer:
B
— They have a ring structure
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Q. Which of the following is a characteristic of dicots? (2022)
-
A.
Single cotyledon
-
B.
Net-like leaf venation
-
C.
Scattered vascular bundles
-
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)
-
A.
Two cotyledons
-
B.
Parallel venation
-
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 digital communication systems?
-
A.
Continuous signal representation
-
B.
Higher susceptibility to noise
-
C.
Easier encryption and security
-
D.
Lower data transmission rates
Solution
Digital communication systems allow for easier encryption and security measures compared to analog systems.
Correct Answer:
C
— Easier encryption and security
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Q. Which of the following is a characteristic of digital signals?
-
A.
Continuous in nature
-
B.
Discrete in nature
-
C.
More susceptible to noise
-
D.
Require more bandwidth than analog signals
Solution
Digital signals are discrete in nature, representing data in binary form, which makes them less susceptible to noise compared to analog signals.
Correct Answer:
B
— Discrete in nature
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Q. Which of the following is a characteristic of elastic materials? (2023)
-
A.
They return to original shape after deformation
-
B.
They permanently deform
-
C.
They break easily
-
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?
-
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 enzymes?
-
A.
They are consumed in reactions
-
B.
They increase the activation energy
-
C.
They are specific to substrates
-
D.
They function at all temperatures
Solution
Enzymes are highly specific to their substrates, allowing them to catalyze specific biochemical reactions.
Correct Answer:
C
— They are specific to substrates
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Q. Which of the following is a characteristic of essential amino acids? (2019)
-
A.
Can be synthesized by the body
-
B.
Must be obtained from diet
-
C.
Are not required for protein synthesis
-
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)
-
A.
Water-soluble
-
B.
Volatile
-
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)
-
A.
Higher boiling point than alcohols
-
B.
Lower boiling point than alcohols
-
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)
-
A.
No nucleus
-
B.
Circular DNA
-
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
-
B.
They contain introns
-
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 exponential functions?
-
A.
They have a constant rate of change.
-
B.
They grow or decay at a constant percentage rate.
-
C.
They are always positive.
-
D.
They can be represented by a straight line.
Solution
Exponential functions grow or decay at a constant percentage rate, which is a defining characteristic.
Correct Answer:
B
— They grow or decay at a constant percentage rate.
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Q. Which of the following is a characteristic of fibrous proteins?
-
A.
Soluble in water
-
B.
Structural role
-
C.
Globular shape
-
D.
Enzymatic activity
Solution
Fibrous proteins are typically insoluble in water and serve structural roles in cells and tissues.
Correct Answer:
B
— Structural role
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Q. Which of the following is a characteristic of gamma radiation?
-
A.
It has mass
-
B.
It is positively charged
-
C.
It has high penetrating power
-
D.
It can be deflected by magnetic fields
Solution
Gamma radiation is a form of electromagnetic radiation with high penetrating power and no mass or charge.
Correct Answer:
C
— It has high penetrating power
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