Welcome to the Biological Molecules Water MDCAT MCQs with Answers. In this post, we have shared Water Multiple Choice Questions and Answers for PMC MDCAT 2024. Each question in MDCAT Biology offers a chance to enhance your knowledge regarding Biological Molecules Water in this MDCAT Online Test.
What is the primary role of water in biological systems?
a) Energy storage
b) Structural support
c) Temperature regulation
d) Genetic material
What type of bond is responsible for the cohesion of water molecules?
a) Ionic bond
b) Covalent bond
c) Hydrogen bond
d) Disulfide bond
Which property of water allows it to dissolve many substances?
a) Polarity
b) High heat capacity
c) Low density as a solid
d) High surface tension
What is the term for the ability of water to rise in capillary tubes?
a) Osmosis
b) Diffusion
c) Capillary action
d) Evaporation
Which of the following properties of water contributes to its high boiling point?
a) Low density
b) High heat capacity
c) High surface tension
d) Polarity
Water has a high specific heat capacity because of which type of bonding?
a) Ionic bonds
b) Hydrogen bonds
c) Covalent bonds
d) Van der Waals forces
What is the primary role of water in the process of photosynthesis?
a) Providing carbon
b) Providing energy
c) Serving as a solvent
d) Providing electrons and protons
Which property of water helps in the cooling of the body through sweating?
a) High surface tension
b) High heat capacity
c) High density
d) High solubility
Water’s ability to dissolve many substances is primarily due to its
a) Nonpolar nature
b) High density
c) Polarity
d) High boiling point
What phenomenon occurs when water molecules stick to other substances?
a) Cohesion
b) Adhesion
c) Evaporation
d) Condensation
Which property of water is demonstrated by water droplets forming on a leaf surface?
a) Cohesion
b) Surface tension
c) Polarity
d) Capillary action
Water’s high heat of vaporization is important for
a) Increasing the rate of chemical reactions
b) Maintaining constant body temperature
c) Facilitating photosynthesis
d) Enzyme catalysis
Which property of water is crucial for its role in transporting nutrients in plants?
a) High specific heat
b) High surface tension
c) High heat of vaporization
d) Polarity
What causes water to have a high boiling point relative to its molecular weight?
a) Ionic bonding
b) Hydrogen bonding
c) Van der Waals forces
d) Covalent bonding
Which property of water is responsible for the meniscus formation in a graduated cylinder?
a) Cohesion
b) Adhesion
c) Evaporation
d) Condensation
Which process describes the movement of water from the roots to the leaves in plants?
a) Photosynthesis
b) Transpiration
c) Respiration
d) Germination
What is the state of water at its freezing point under normal atmospheric pressure?
a) Liquid
b) Gas
c) Solid
d) Plasma
Which of the following substances would water be least likely to dissolve?
a) Salt
b) Sugar
c) Oil
d) Alcohol
What term describes the ability of water to act as a solvent in many biochemical reactions?
a) Reactivity
b) Polarity
c) Heat capacity
d) Cohesion
The density of water is greatest at which temperature?
a) 0°C
b) 25°C
c) 37°C
d) 4°C
Which property of water makes it a good coolant?
a) Low specific heat
b) High specific heat
c) High density
d) Low surface tension
What is the name of the process by which water evaporates from the surface of leaves?
a) Transpiration
b) Condensation
c) Sublimation
d) Precipitation
What property of water helps in temperature regulation in living organisms?
a) High specific heat
b) High density
c) Low boiling point
d) Low surface tension
In which of the following forms does water exist in the atmosphere?
a) Solid only
b) Liquid only
c) Gas only
d) Solid, liquid, and gas
What is the primary reason for the unique properties of water?
a) Its small molecular size
b) Its high density
c) Its ability to form hydrogen bonds
d) Its low boiling point
Which of the following is a property of water due to hydrogen bonding?
a) High density
b) High vapor pressure
c) High surface tension
d) Low specific heat
Which of the following best describes water’s role in the human body?
a) Solvent
b) Enzyme
c) Hormone
d) Coenzyme
What is the process called when water changes from a liquid to a gas?
a) Condensation
b) Sublimation
c) Evaporation
d) Freezing
Which property of water explains why ice floats on liquid water?
a) Water’s high heat capacity
b) Water’s high density
c) Water’s lower density as a solid
d) Water’s high surface tension
Which aspect of water contributes to its ability to regulate temperature in organisms?
a) Its high vapor pressure
b) Its high specific heat
c) Its low freezing point
d) Its low boiling point
Which property of water is essential for its role in regulating body temperature through sweating?
a) High density
b) High heat of vaporization
c) High surface tension
d) High specific heat
Which of the following properties of water allows it to act as a solvent for ionic compounds?
a) Polarity
b) Density
c) High specific heat
d) Low boiling point
What is the primary factor affecting the solubility of a substance in water?
a) Size of the molecule
b) Polarity of the substance
c) Boiling point
d) Melting point
What term describes the energy required to change water from a liquid to a gas?
a) Heat of fusion
b) Heat of vaporization
c) Specific heat
d) Latent heat
Which process involves water moving through a semi-permeable membrane from a region of lower solute concentration to higher solute concentration?
a) Osmosis
b) Diffusion
c) Filtration
d) Active transport
What does the term “specific heat” of water refer to?
a) The amount of heat required to raise the temperature of a unit mass of water by one degree Celsius
b) The amount of heat required to change water from a liquid to a solid
c) The amount of heat required to evaporate a unit mass of water
d) The temperature at which water boils
What happens to water’s density as it freezes?
a) It increases
b) It decreases
c) It remains the same
d) It fluctuates
Which property of water is demonstrated when water droplets bead up on a non-polar surface?
a) Adhesion
b) Cohesion
c) Polarity
d) Evaporation
Which form of water is the least dense?
a) Liquid
b) Gas
c) Solid
d) Plasma
What is the term for the movement of water through plant tissues from roots to leaves?
a) Photosynthesis
b) Respiration
c) Transpiration
d) Fermentation
Which type of bond holds together the hydrogen and oxygen atoms in a water molecule?
a) Ionic bond
b) Hydrogen bond
c) Covalent bond
d) Metallic bond
The high heat capacity of water helps in stabilizing the temperature of
a) Air
b) Soil
c) Water bodies
d) Metals
What is the effect of water’s high surface tension on small objects placed on its surface?
a) They sink
b) They float
c) They dissolve
d) They evaporate
What causes water to form a meniscus in a graduated cylinder?
a) Cohesion
b) Adhesion
c) Evaporation
d) Density
Which of the following is a unique feature of water’s solid state compared to its liquid state?
a) Higher density
b) Lower density
c) Lower heat capacity
d) Higher heat of vaporization
Which property of water is crucial for its role in maintaining the temperature of the Earth?
a) High boiling point
b) High heat of vaporization
c) High density
d) Low heat capacity
If you are interested to enhance your knowledge regarding Physics, Chemistry, Computer, and Biology please click on the link of each category, you will be redirected to dedicated website for each category.
