Q. What is the primary characteristic of adsorption? (2023)
A.
It is a bulk phenomenon.
B.
It involves a chemical reaction.
C.
It is a surface phenomenon.
D.
It requires high temperature.
Show solution
Solution
Adsorption is a surface phenomenon where molecules adhere to the surface of a solid or liquid.
Correct Answer:
C
— It is a surface phenomenon.
Learn More →
Q. What is the primary characteristic of alkaline earth metals? (2020)
A.
They are highly reactive
B.
They have a +2 oxidation state
C.
They are gases at room temperature
D.
They form covalent bonds
Show solution
Solution
Alkaline earth metals typically have a +2 oxidation state due to the loss of two electrons.
Correct Answer:
B
— They have a +2 oxidation state
Learn More →
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 of gases compared to solids and liquids? (2023)
A.
Definite shape
B.
Definite volume
C.
High compressibility
D.
Low density
Show solution
Solution
Gases have high compressibility due to the large spaces between particles, unlike solids and liquids which have definite shape and volume.
Correct Answer:
C
— High compressibility
Learn More →
Q. What is the primary characteristic of gases? (2023)
A.
Definite shape
B.
Definite volume
C.
Compressibility
D.
Incompressibility
Show solution
Solution
Gases are highly compressible due to the large spaces between particles, allowing them to occupy more volume when pressure is applied.
Correct Answer:
C
— Compressibility
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 natural gas? (2020)
A.
Ethane
B.
Propane
C.
Methane
D.
Butane
Show solution
Solution
The primary component of natural gas is methane (CH4).
Correct Answer:
C
— Methane
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 membrane?
A.
Proteins
B.
Carbohydrates
C.
Phospholipids
D.
Nucleic Acids
Show solution
Solution
Phospholipids are the primary component of cell membranes, forming a bilayer.
Correct Answer:
C
— Phospholipids
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 liquids and gases? (2023)
A.
Shape
B.
Volume
C.
Compressibility
D.
Density
Show solution
Solution
Gases are highly compressible while liquids are not, due to the distance between particles in each state.
Correct Answer:
C
— Compressibility
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 difference between solids and liquids in terms of particle arrangement? (2023)
A.
Solids have loosely packed particles
B.
Liquids have tightly packed particles
C.
Solids have fixed shape and volume
D.
Liquids have fixed shape but variable volume
Show solution
Solution
Solids have a fixed shape and volume due to closely packed particles, while liquids take the shape of their container but have a fixed volume.
Correct Answer:
C
— Solids have fixed shape and volume
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 affecting the rate of adsorption of a gas on a solid surface?
A.
Temperature
B.
Pressure
C.
Surface area
D.
Molecular weight
Show solution
Solution
The rate of adsorption increases with the surface area of the solid, as more surface provides more sites for gas molecules to adhere.
Correct Answer:
C
— Surface area
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 →
Showing 3211 to 3240 of 5509 (184 Pages)