Q. Which of the following is a characteristic of pathogenic microbes? (2019)
A.
They are always beneficial
B.
They can cause diseases
C.
They are used in food production
D.
They are harmless
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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)
A.
Growth towards light
B.
Growth away from light
C.
Uniform growth in all directions
D.
Growth in response to gravity
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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)
A.
They are harmful bacteria
B.
They promote gut health
C.
They cause infections
D.
They are not found in food
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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)
A.
Membrane-bound organelles
B.
Nucleus
C.
Circular DNA
D.
Multicellular
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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 radioactive decay? (2019)
A.
It is a random process
B.
It occurs at a constant rate
C.
It can be accelerated by external factors
D.
It produces energy only
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Solution
Radioactive decay is a random process, meaning that it cannot be predicted when a particular nucleus will decay.
Correct Answer:
A
— It is a random process
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Q. Which of the following is a characteristic of sexual reproduction in plants? (2019)
A.
Produces genetically identical offspring
B.
Involves gamete formation
C.
Occurs only in flowering plants
D.
Is faster than asexual reproduction
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Solution
Sexual reproduction in plants involves the formation of gametes (male and female) and results in genetically diverse offspring.
Correct Answer:
B
— Involves gamete formation
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Q. Which of the following is a characteristic of sexual reproduction? (2022)
A.
Produces identical offspring
B.
Involves two parents
C.
Occurs in all organisms
D.
Faster than asexual reproduction
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Solution
Sexual reproduction typically involves two parents and results in offspring that are genetically diverse.
Correct Answer:
B
— Involves two parents
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Q. Which of the following is a characteristic of the image formed by a concave mirror when the object is placed between the focal point and the mirror? (2019)
A.
Real and inverted
B.
Virtual and erect
C.
Real and erect
D.
Virtual and inverted
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Solution
When the object is placed between the focal point and the mirror, the image formed by a concave mirror is virtual and erect.
Correct Answer:
B
— Virtual and erect
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Q. Which of the following is a characteristic of the kingdom Animalia? (2021)
A.
Cell walls
B.
Autotrophic nutrition
C.
Multicellular and heterotrophic
D.
Chlorophyll
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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 Archaea? (2023)
A.
Presence of peptidoglycan in cell walls
B.
Extreme environmental conditions
C.
Eukaryotic cells
D.
Photosynthetic
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Solution
Archaea are known for thriving in extreme environmental conditions.
Correct Answer:
B
— Extreme environmental conditions
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Q. Which of the following is a characteristic of the kingdom Monera? (2019)
A.
Eukaryotic cells
B.
Multicellular organisms
C.
Prokaryotic cells
D.
Chloroplasts
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Solution
Monera consists of prokaryotic cells, which are unicellular and lack a defined nucleus.
Correct Answer:
C
— Prokaryotic cells
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Q. Which of the following is a characteristic of the kingdom Plantae? (2022)
A.
Heterotrophic
B.
Cellulose in cell walls
C.
Unicellular
D.
Motile
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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 kingdom Protista?
A.
All are multicellular
B.
All are prokaryotic
C.
Includes both autotrophic and heterotrophic organisms
D.
Only unicellular organisms
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Solution
The kingdom Protista includes both autotrophic and heterotrophic organisms.
Correct Answer:
C
— Includes both autotrophic and heterotrophic organisms
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Q. Which of the following is a characteristic of the phylum Annelida? (2023)
A.
Body is segmented
B.
Presence of a shell
C.
Radial symmetry
D.
Exoskeleton
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Solution
Annelida, or segmented worms, are characterized by their segmented bodies.
Correct Answer:
A
— Body is segmented
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Q. Which of the following is a characteristic of the phylum Echinodermata? (2021)
A.
Bilateral symmetry
B.
Radial symmetry in adults
C.
Exoskeleton made of chitin
D.
Presence of a notochord
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Solution
Echinoderms exhibit radial symmetry in their adult form, which is a defining characteristic of this phylum.
Correct Answer:
B
— Radial symmetry in adults
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Q. Which of the following is a characteristic of the phylum Nematoda? (2022)
A.
Segmented body
B.
Presence of a true coelom
C.
Body covered with a cuticle
D.
Radial symmetry
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Solution
Nematodes, or roundworms, are characterized by a body covered with a cuticle and are unsegmented.
Correct Answer:
C
— Body covered with a cuticle
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Q. Which of the following is a characteristic of the phylum Porifera? (2019)
A.
True tissues
B.
Radial symmetry
C.
Body with pores
D.
Bilateral symmetry
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Solution
Phylum Porifera, which includes sponges, is characterized by a porous body structure.
Correct Answer:
C
— Body with pores
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Q. Which of the following is a characteristic property of ethers? (2019)
A.
High boiling point
B.
Solubility in water
C.
Low reactivity
D.
Acidic nature
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Solution
Ethers are generally low in reactivity compared to alcohols and phenols, making them stable compounds.
Correct Answer:
C
— Low reactivity
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Q. Which of the following is a characteristic property of group 13 elements? (2019)
A.
Forming covalent compounds
B.
High melting points
C.
Good conductors of electricity
D.
Forming ionic compounds
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Solution
Group 13 elements typically form covalent compounds due to their tendency to share electrons.
Correct Answer:
A
— Forming covalent compounds
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Q. Which of the following is a characteristic property of halogens? (2020)
A.
Good conductors of electricity
B.
High melting points
C.
Diatomic molecules
D.
Metallic luster
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Solution
Halogens exist as diatomic molecules (e.g., Cl2, F2) in their elemental form.
Correct Answer:
C
— Diatomic molecules
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Q. Which of the following is a characteristic property of noble gases? (2019)
A.
High reactivity
B.
Colorless and odorless
C.
Forming ionic bonds
D.
High boiling points
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Solution
Noble gases are colorless and odorless under standard conditions.
Correct Answer:
B
— Colorless and odorless
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Q. Which of the following is a common allotrope of phosphorus? (2022)
A.
Red phosphorus
B.
Black phosphorus
C.
White phosphorus
D.
All of the above
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Solution
Phosphorus exists in several allotropes, including red, black, and white phosphorus.
Correct Answer:
D
— All of the above
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Q. Which of the following is a common analgesic? (2021)
A.
Ibuprofen
B.
Aspirin
C.
Paracetamol
D.
All of the above
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Solution
All of the options listed (Ibuprofen, Aspirin, and Paracetamol) are common analgesics used to relieve pain.
Correct Answer:
D
— All of the above
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Q. Which of the following is a common application of biotechnology in medicine? (2018)
A.
Bioremediation
B.
Gene cloning
C.
Fermentation
D.
Tissue culture
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Solution
Gene cloning is a common application in biotechnology for producing proteins and studying genes.
Correct Answer:
B
— Gene cloning
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Q. Which of the following is a common application of biotechnology in the food industry? (2020)
A.
Fermentation
B.
Genetic modification
C.
Food preservation
D.
All of the above
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Solution
Biotechnology is widely used in the food industry for fermentation, genetic modification, and food preservation.
Correct Answer:
D
— All of the above
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Q. Which of the following is a common application of biotechnology in the pharmaceutical industry? (2020)
A.
Production of biofuels
B.
Development of genetically modified crops
C.
Synthesis of therapeutic proteins
D.
Bioremediation of oil spills
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Solution
The synthesis of therapeutic proteins, such as insulin and monoclonal antibodies, is a common application of biotechnology in the pharmaceutical industry.
Correct Answer:
C
— Synthesis of therapeutic proteins
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Q. Which of the following is a common application of microbes in agriculture? (2019)
A.
Pesticides
B.
Fertilizers
C.
Soil enhancement
D.
All of the above
Show solution
Solution
Microbes are used in agriculture for pesticides, fertilizers, and enhancing soil fertility.
Correct Answer:
D
— All of the above
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Q. Which of the following is a common application of photodiodes? (2022)
A.
Voltage regulation
B.
Light detection
C.
Signal amplification
D.
Energy storage
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Solution
Photodiodes are commonly used for light detection in various applications.
Correct Answer:
B
— Light detection
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Q. Which of the following is a common application of semiconductors? (2019)
A.
Light bulbs
B.
Transistors
C.
Resistors
D.
Capacitors
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Solution
Transistors are a common application of semiconductors, used in various electronic devices.
Correct Answer:
B
— Transistors
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Q. Which of the following is a common application of yeast in human welfare? (2021)
A.
Antibiotic production
B.
Alcoholic fermentation
C.
Pathogen control
D.
Nutrient recycling
Show solution
Solution
Yeast is commonly used in alcoholic fermentation to produce beverages like beer and wine.
Correct Answer:
B
— Alcoholic fermentation
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