Q. Which of the following is a unicellular organism? (2019)
-
A.
Euglena
-
B.
Mango tree
-
C.
Human
-
D.
Frog
Solution
Euglena is a unicellular organism.
Correct Answer:
A
— Euglena
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Q. Which of the following is a unit of frequency? (2023)
-
A.
Hertz
-
B.
Joule
-
C.
Newton
-
D.
Pascal
Solution
Hertz (Hz) is the unit of frequency, defined as cycles per second.
Correct Answer:
A
— Hertz
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Q. Which of the following is a vector for malaria? (2019)
-
A.
Housefly
-
B.
Mosquito
-
C.
Tick
-
D.
Louse
Solution
Malaria is transmitted by the female Anopheles mosquito, which acts as a vector.
Correct Answer:
B
— Mosquito
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Q. Which of the following is a vector for the transmission of dengue fever? (2021)
-
A.
Housefly
-
B.
Mosquito
-
C.
Tick
-
D.
Louse
Solution
Dengue fever is transmitted by Aedes mosquitoes.
Correct Answer:
B
— Mosquito
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Q. Which of the following is a waste product of protein metabolism? (2019)
-
A.
Glucose
-
B.
Urea
-
C.
Lactate
-
D.
Glycogen
Solution
Urea is a waste product formed from the breakdown of proteins and is excreted in urine.
Correct Answer:
B
— Urea
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Q. Which of the following is an abiotic factor in an ecosystem? (2019)
-
A.
Fungi
-
B.
Bacteria
-
C.
Temperature
-
D.
Plants
Solution
Abiotic factors are the non-living physical and chemical components of an ecosystem, such as temperature.
Correct Answer:
C
— Temperature
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Q. Which of the following is an ether? (2023)
-
A.
Ethyl alcohol
-
B.
Dimethyl ether
-
C.
Phenol
-
D.
Acetic acid
Solution
Dimethyl ether is an ether, characterized by the presence of an oxygen atom connected to two alkyl or aryl groups.
Correct Answer:
B
— Dimethyl ether
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Q. Which of the following is an example of a biotic factor in an ecosystem? (2022)
-
A.
Soil pH
-
B.
Temperature
-
C.
Plants
-
D.
Water availability
Solution
Plants are a biotic factor as they are living organisms that interact with other organisms in the ecosystem.
Correct Answer:
C
— Plants
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Q. Which of the following is an example of a colligative property? (2021)
-
A.
Boiling point elevation
-
B.
Density
-
C.
Color
-
D.
pH
Solution
Colligative properties depend on the number of solute particles in a solution, and boiling point elevation is one such property.
Correct Answer:
A
— Boiling point elevation
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Q. Which of the following is an example of a condensation polymer? (2023)
-
A.
Polyethylene
-
B.
Nylon-6,6
-
C.
Polystyrene
-
D.
Polyvinyl chloride
Solution
Nylon-6,6 is a condensation polymer formed by the reaction of hexamethylenediamine and adipic acid.
Correct Answer:
B
— Nylon-6,6
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Q. Which of the following is an example of a decomposer? (2023)
-
A.
Fungi
-
B.
Grass
-
C.
Lion
-
D.
Insect
Solution
Fungi are decomposers that break down dead organic matter, returning nutrients to the soil.
Correct Answer:
A
— Fungi
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Q. Which of the following is an example of a density-dependent factor affecting population growth? (2021)
-
A.
Natural disasters
-
B.
Disease
-
C.
Climate change
-
D.
Habitat destruction
Solution
Density-dependent factors, such as disease, have a greater effect as the population density increases.
Correct Answer:
B
— Disease
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Q. Which of the following is an example of a dihybrid cross? (2019)
-
A.
Aa x Aa
-
B.
AaBb x AaBb
-
C.
AA x aa
-
D.
Aa x aa
Solution
A dihybrid cross involves two traits, and AaBb x AaBb is an example of such a cross.
Correct Answer:
B
— AaBb x AaBb
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Q. Which of the following is an example of a genetically modified organism used in agriculture? (2023)
-
A.
Golden rice
-
B.
Organic wheat
-
C.
Traditional maize
-
D.
Heritage tomatoes
Solution
Golden rice is a genetically modified organism enriched with vitamin A to combat malnutrition.
Correct Answer:
A
— Golden rice
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Q. Which of the following is an example of a genetically modified organism? (2021)
-
A.
Organic tomatoes
-
B.
Bt corn
-
C.
Heritage wheat
-
D.
Wild strawberries
Solution
Bt corn is genetically modified to express a bacterial protein that provides resistance to certain pests.
Correct Answer:
B
— Bt corn
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Q. Which of the following is an example of a keystone species? (2018)
-
A.
Elephants
-
B.
Rabbits
-
C.
Deer
-
D.
Sparrows
Solution
Elephants are considered a keystone species because they play a critical role in maintaining the structure of their ecosystem.
Correct Answer:
A
— Elephants
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Q. Which of the following is an example of a longitudinal wave? (2023)
-
A.
Light wave
-
B.
Sound wave
-
C.
Water wave
-
D.
Seismic S-wave
Solution
A sound wave is an example of a longitudinal wave, where the particle displacement is parallel to the direction of wave propagation.
Correct Answer:
B
— Sound wave
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Q. Which of the following is an example of a lyophilic colloid? (2021)
-
A.
Starch in water
-
B.
Smoke in air
-
C.
Milk
-
D.
Dust in air
Solution
Starch in water is a lyophilic colloid as it has a strong affinity for the solvent.
Correct Answer:
A
— Starch in water
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Q. Which of the following is an example of a metallic solid? (2023)
-
A.
NaCl
-
B.
SiO2
-
C.
Fe
-
D.
C12H22O11
Solution
Iron (Fe) is an example of a metallic solid, characterized by its metallic bonding and properties.
Correct Answer:
C
— Fe
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Q. Which of the following is an example of a molecular solid? (2023)
-
A.
NaCl
-
B.
Diamond
-
C.
Iodine (I2)
-
D.
Iron (Fe)
Solution
Iodine (I2) is an example of a molecular solid, where molecules are held together by van der Waals forces.
Correct Answer:
C
— Iodine (I2)
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Q. Which of the following is an example of a mutualistic relationship? (2023)
-
A.
Bees pollinating flowers
-
B.
Lions hunting zebras
-
C.
Moss growing on a tree
-
D.
Birds nesting in trees
Solution
Bees pollinating flowers is a mutualistic relationship where both species benefit from the interaction.
Correct Answer:
A
— Bees pollinating flowers
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Q. Which of the following is an example of a natural sweetener? (2021)
-
A.
Aspartame
-
B.
Stevia
-
C.
Sucralose
-
D.
Saccharin
Solution
Stevia is a natural sweetener derived from the leaves of the Stevia rebaudiana plant, making it a healthier alternative to synthetic sweeteners.
Correct Answer:
B
— Stevia
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Q. Which of the following is an example of a non-renewable energy source? (2017)
-
A.
Solar energy
-
B.
Wind energy
-
C.
Natural gas
-
D.
Hydropower
Solution
Natural gas is a non-renewable energy source as it is derived from fossil fuels that cannot be replenished in a short time.
Correct Answer:
C
— Natural gas
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Q. Which of the following is an example of a non-stoichiometric solid? (2023)
-
A.
NaCl
-
B.
FeO
-
C.
MgO
-
D.
KCl
Solution
FeO is an example of a non-stoichiometric solid because it can have varying ratios of iron and oxygen.
Correct Answer:
B
— FeO
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Q. Which of the following is an example of a plasma? (2023)
-
A.
Ice
-
B.
Water
-
C.
Steam
-
D.
Lightning
Solution
Lightning is an example of plasma, which is a state of matter consisting of ionized gas with free electrons.
Correct Answer:
D
— Lightning
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Q. Which of the following is an example of a primary consumer? (2021)
-
A.
Grass
-
B.
Rabbit
-
C.
Fox
-
D.
Mushroom
Solution
A rabbit is an example of a primary consumer as it feeds on plants (producers).
Correct Answer:
B
— Rabbit
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Q. Which of the following is an example of a saturated hydrocarbon? (2023)
-
A.
Ethylene
-
B.
Propylene
-
C.
Butane
-
D.
Benzene
Solution
Butane is a saturated hydrocarbon, meaning it contains only single bonds between carbon atoms.
Correct Answer:
C
— Butane
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Q. Which of the following is an example of a scalar quantity? (2023)
-
A.
Velocity
-
B.
Force
-
C.
Mass
-
D.
Acceleration
Solution
Mass is a scalar quantity as it has magnitude but no direction.
Correct Answer:
C
— Mass
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Q. Which of the following is an example of a sex-linked trait? (2019)
-
A.
Color blindness
-
B.
Height
-
C.
Seed shape
-
D.
Flower color
Solution
Color blindness is a sex-linked trait, primarily located on the X chromosome, affecting males more frequently than females.
Correct Answer:
A
— Color blindness
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Q. Which of the following is an example of a substance in the plasma state? (2023)
-
A.
Water
-
B.
Oxygen gas
-
C.
Lightning
-
D.
Ice
Solution
Plasma is a state of matter where gases are energized until atomic electrons are no longer associated with the nucleus, as seen in lightning.
Correct Answer:
C
— Lightning
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