Q. What is the primary characteristic of amorphous solids? (2023)
A.
Long-range order
B.
Short-range order
C.
Definite melting point
D.
High thermal conductivity
Show solution
Solution
Amorphous solids have short-range order but lack long-range order, unlike crystalline solids.
Correct Answer: B — Short-range order
Learn More →
Q. What is the primary characteristic that distinguishes living organisms from non-living things? (2020)
A.
Ability to reproduce
B.
Ability to move
C.
Ability to grow
D.
Ability to respond to stimuli
Show solution
Solution
The primary characteristic that distinguishes living organisms from non-living things is their ability to reproduce, which is essential for the continuation of species.
Correct Answer: A — Ability to reproduce
Learn More →
Q. What is the primary component of blood that is responsible for transporting oxygen? (2021)
A.
Plasma
B.
Red blood cells
C.
White blood cells
D.
Platelets
Show solution
Solution
Red blood cells contain hemoglobin, which binds to oxygen and transports it throughout the body.
Correct Answer: B — Red blood cells
Learn More →
Q. What is the primary component of plasma in blood? (2020)
A.
Water
B.
Proteins
C.
Electrolytes
D.
Nutrients
Show solution
Solution
Plasma is composed of approximately 90% water, which serves as a solvent for various substances in the blood.
Correct Answer: A — Water
Learn More →
Q. What is the primary component of the cell wall in plants? (2023)
A.
Cellulose
B.
Chitin
C.
Peptidoglycan
D.
Lipid
Show solution
Solution
Cellulose is the primary component of the cell wall in plants, providing structural support.
Correct Answer: A — Cellulose
Learn More →
Q. What is the primary criterion for classifying organisms into different kingdoms? (2023)
A.
Cell structure
B.
Habitat
C.
Reproductive methods
D.
Size
Show solution
Solution
The primary criterion for classifying organisms into different kingdoms is cell structure, distinguishing between prokaryotic and eukaryotic cells.
Correct Answer: A — Cell structure
Learn More →
Q. What is the primary difference between physisorption and chemisorption? (2023)
A.
Physisorption is stronger than chemisorption
B.
Chemisorption involves chemical bonds, while physisorption involves van der Waals forces
C.
Physisorption is irreversible, while chemisorption is reversible
D.
Chemisorption occurs at lower temperatures than physisorption
Show solution
Solution
The primary difference is that chemisorption involves the formation of chemical bonds, while physisorption involves weaker van der Waals forces.
Correct Answer: B — Chemisorption involves chemical bonds, while physisorption involves van der Waals forces
Learn More →
Q. What is the primary effect of cortisol in the body? (2023)
A.
Increase blood sugar
B.
Decrease inflammation
C.
Regulate metabolism
D.
All of the above
Show solution
Solution
Cortisol has multiple effects including increasing blood sugar levels, decreasing inflammation, and regulating metabolism.
Correct Answer: D — All of the above
Learn More →
Q. What is the primary effect of deforestation on the environment? (2021)
A.
Increased biodiversity
B.
Soil conservation
C.
Loss of habitat
D.
Improved air quality
Show solution
Solution
Deforestation leads to the loss of habitat for many species, contributing to biodiversity loss and ecosystem degradation.
Correct Answer: C — Loss of habitat
Learn More →
Q. What is the primary effect of parathyroid hormone (PTH)? (2019)
A.
Increase calcium levels in blood
B.
Decrease calcium levels in blood
C.
Regulate metabolism
D.
Stimulate growth
Show solution
Solution
Parathyroid hormone (PTH) increases calcium levels in the blood by promoting the release of calcium from bones and increasing absorption in the intestines.
Correct Answer: A — Increase calcium levels in blood
Learn More →
Q. What is the primary energy source for muscle contraction during short bursts of activity? (2022)
A.
A. Fatty acids
B.
B. Glucose
C.
C. Creatine phosphate
D.
D. Lactic acid
Show solution
Solution
Creatine phosphate provides a rapid source of energy for muscle contraction during short bursts of activity.
Correct Answer: C — C. Creatine phosphate
Learn More →
Q. What is the primary energy source for muscle contraction? (2023)
A.
Glucose
B.
Fatty acids
C.
ATP
D.
Creatine phosphate
Show solution
Solution
ATP (adenosine triphosphate) is the primary energy source for muscle contraction.
Correct Answer: C — ATP
Learn More →
Q. What is the primary excretory product of human metabolism? (2021)
A.
Urea
B.
Creatinine
C.
Uric acid
D.
Ammonia
Show solution
Solution
Urea is the primary excretory product formed from the breakdown of proteins in the liver and is excreted by the kidneys.
Correct Answer: A — Urea
Learn More →
Q. What is the primary excretory product of humans? (2021)
A.
Urea
B.
Creatinine
C.
Uric acid
D.
Ammonia
Show solution
Solution
Urea is the primary nitrogenous waste product excreted by humans, formed in the liver from ammonia and carbon dioxide.
Correct Answer: A — Urea
Learn More →
Q. What is the primary factor affecting the rate of a chemical reaction? (2022)
A.
Concentration
B.
Temperature
C.
Catalyst
D.
All of the above
Show solution
Solution
All of the above factors affect the rate of a chemical reaction.
Correct Answer: D — All of the above
Learn More →
Q. What is the primary factor that affects the rate of photosynthesis in relation to water transport?
A.
Light intensity
B.
Carbon dioxide concentration
C.
Water availability
D.
Temperature
Show solution
Solution
Water availability is crucial for photosynthesis, as it is a raw material needed for the process.
Correct Answer: C — Water availability
Learn More →
Q. What is the primary factor that determines the distribution of organisms in an ecosystem? (2020)
A.
Soil type
B.
Climate
C.
Topography
D.
Human activity
Show solution
Solution
Climate is the primary factor influencing the distribution of organisms, as it affects temperature, precipitation, and seasonal changes.
Correct Answer: B — Climate
Learn More →
Q. What is the primary factor that determines the inductance of a coil? (2020)
A.
Length of the wire
B.
Number of turns
C.
Material of the core
D.
All of the above
Show solution
Solution
The inductance of a coil is determined by the length of the wire, the number of turns, and the material of the core.
Correct Answer: D — All of the above
Learn More →
Q. What is the primary factor that determines the type of ecosystem in a particular area? (2022)
A.
Soil type
B.
Climate
C.
Topography
D.
Human activity
Show solution
Solution
Climate is the primary factor that determines the type of ecosystem in a particular area, influencing temperature and precipitation.
Correct Answer: B — Climate
Learn More →
Q. What is the primary focus of ex-situ conservation? (2022)
A.
Protecting species in their natural habitat
B.
Captive breeding of endangered species
C.
Restoring degraded ecosystems
D.
Creating wildlife corridors
Show solution
Solution
Ex-situ conservation focuses on the captive breeding of endangered species outside their natural habitats.
Correct Answer: B — Captive breeding of endangered species
Learn More →
Q. What is the primary focus of the Convention on Biological Diversity (CBD)? (2019)
A.
Climate change
B.
Sustainable development
C.
Pollution control
D.
Economic growth
Show solution
Solution
The primary focus of the Convention on Biological Diversity (CBD) is sustainable development and the conservation of biological diversity.
Correct Answer: B — Sustainable development
Learn More →
Q. What is the primary force holding the atoms together in covalent network solids? (2022)
A.
Ionic bonds
B.
Covalent bonds
C.
Metallic bonds
D.
Van der Waals forces
Show solution
Solution
Covalent network solids are held together by covalent bonds, forming a continuous network throughout the solid.
Correct Answer: B — Covalent bonds
Learn More →
Q. What is the primary force holding together the atoms in a metallic solid? (2020)
A.
Ionic bonds
B.
Covalent bonds
C.
Metallic bonds
D.
Van der Waals forces
Show solution
Solution
Metallic solids are held together by metallic bonds, which involve a 'sea' of delocalized electrons around positively charged metal ions.
Correct Answer: C — Metallic bonds
Learn More →
Q. What is the primary force holding together the atoms in metallic solids? (2020)
A.
Ionic bonds
B.
Covalent bonds
C.
Metallic bonds
D.
Van der Waals forces
Show solution
Solution
Metallic solids are held together by metallic bonds, which involve a 'sea of electrons' that are free to move.
Correct Answer: C — Metallic bonds
Learn More →
Q. What is the primary function of a diode? (2022)
A.
To amplify current
B.
To rectify current
C.
To store charge
D.
To generate voltage
Show solution
Solution
A diode primarily functions to rectify current, allowing it to flow in one direction only.
Correct Answer: B — To rectify current
Learn More →
Q. What is the primary function of a transformer? (2021)
A.
To convert AC to DC
B.
To increase or decrease voltage
C.
To store electrical energy
D.
To measure current
Show solution
Solution
A transformer is used to increase or decrease the voltage in an AC circuit while keeping the power constant.
Correct Answer: B — To increase or decrease voltage
Learn More →
Q. What is the primary function of antibiotics? (2020)
A.
Pain relief
B.
Bacterial infection treatment
C.
Viral infection treatment
D.
Fungal infection treatment
Show solution
Solution
Antibiotics are primarily used to treat bacterial infections by inhibiting the growth of bacteria.
Correct Answer: B — Bacterial infection treatment
Learn More →
Q. What is the primary function of antioxidants in food? (2022)
A.
Enhance flavor
B.
Preserve color
C.
Prevent oxidation
D.
Increase sweetness
Show solution
Solution
Antioxidants prevent oxidation, which can lead to spoilage and degradation of food quality.
Correct Answer: C — Prevent oxidation
Learn More →
Q. What is the primary function of antioxidants in the body? (2020)
A.
Increase energy
B.
Prevent oxidation
C.
Enhance digestion
D.
Boost immunity
Show solution
Solution
Antioxidants prevent oxidation by neutralizing free radicals, thus protecting cells from damage.
Correct Answer: B — Prevent oxidation
Learn More →
Q. What is the primary function of antioxidants in the human body? (2020)
A.
Increase energy
B.
Prevent oxidation
C.
Enhance digestion
D.
Boost immunity
Show solution
Solution
Antioxidants prevent oxidation, which can lead to cellular damage and contribute to various diseases.
Correct Answer: B — Prevent oxidation
Learn More →
Showing 1231 to 1260 of 2979 (100 Pages)