NEET (UG) 2025 Syllabus by NMC

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Questions and Answers

What principle underlies the function of a Wheatstone bridge in determining an unknown resistance?

The potential difference across parallel resistors is equal.
The magnetic field generated by a current-carrying wire is directly proportional to the current.
The total resistance in a series circuit is the sum of individual resistances.
The ratio of resistances in adjacent arms of a balanced bridge is constant. (correct)

How does the presence of a dielectric material between the plates of a capacitor affect its capacitance and stored energy?

Decreases both capacitance and stored energy.
Increases capacitance and decreases stored energy.
Decreases capacitance and increases stored energy.
Increases both capacitance and stored energy. (correct)

What is the underlying principle behind the operation of optical fibers in transmitting light signals?

Interference of light waves within the fiber.
Refraction of light at curved surfaces.
Total internal reflection at the core-cladding boundary. (correct)
Diffraction of light through narrow slits.

What is the relationship between the rate constant of a reaction and temperature, according to the Arrhenius equation?

The rate constant increases exponentially with increasing temperature. (B) Signup and view all the answers

How does Le Chatelier's principle predict the shift in equilibrium for an exothermic reaction when temperature is increased?

The equilibrium shifts to favor the reactants. (A) Signup and view all the answers

What is the relationship between pH, pKa, and the concentrations of acid and conjugate base in a buffer solution, as described by the Henderson-Hasselbalch equation?

pH = pKa + log([conjugate base]/[acid]) (D) Signup and view all the answers

Which property of transition metals primarily accounts for their ability to form a variety of coordination compounds with different ligands?

Variable oxidation states (C) Signup and view all the answers

How does the inductive effect influence the acidity of carboxylic acids when electron-withdrawing groups are present?

Increases acidity by stabilizing the carboxylate anion. (A) Signup and view all the answers

What is the role of the lac operon in regulating gene expression in E. coli in the presence and absence of lactose?

Induces gene expression in the presence of lactose and represses it in the absence. (B) Signup and view all the answers

How does the Hardy-Weinberg principle describe the genetic equilibrium in a population and what conditions must be met for this equilibrium to be maintained?

Allele and genotype frequencies remain constant from generation to generation in the absence of disturbing factors. (D) Signup and view all the answers

How does the understanding of enzyme kinetics, specifically the Michaelis-Menten equation, contribute to drug development?

By determining the rate at which a drug binds to and inhibits its target enzyme. (B) Signup and view all the answers

Considering the structure and function of cell membranes, how do the properties of phospholipids contribute to the selective permeability of the membrane?

Their amphipathic nature allows formation of a bilayer that restricts passage of polar molecules. (B) Signup and view all the answers

How do C3 and C4 photosynthetic pathways differ in their initial carbon fixation steps and what advantage does C4 photosynthesis provide in certain environments?

C3 initially fixes carbon into a 3-carbon compound, while C4 fixes carbon into a 4-carbon compound; C4 minimizes photorespiration in hot, dry environments. (C) Signup and view all the answers

What is the role of double fertilization in angiosperms and what are the products of this process?

One sperm fertilizes the egg, and another fertilizes a polar nucleus, forming the endosperm. (B) Signup and view all the answers

How do autoimmune diseases arise, and what is the underlying immunological mechanism that leads to tissue damage?

Failure of immune tolerance, resulting in self-reactive immune cells attacking the body's own tissues. (B) Signup and view all the answers

How are restriction enzymes used in recombinant DNA technology, and what specific sequences do they recognize and cleave?

To cut DNA at specific sequences, creating fragments with sticky or blunt ends, recognizing palindromic sequences. (B) Signup and view all the answers

Given the principles of Mendelian genetics, how does the phenomenon of linkage affect the inheritance patterns of genes located close together on the same chromosome?

Linked genes tend to be inherited together, deviating from Mendel's law of independent assortment. (B) Signup and view all the answers

How does the concept of carrying capacity (K) relate to logistic population growth, and what factors determine the carrying capacity of an environment?

Population growth slows as it approaches K, leading to a stable population size due to limiting resources. (B) Signup and view all the answers

How does the increase in atmospheric carbon dioxide levels contribute to the greenhouse effect, and what are the potential consequences for global climate patterns?

Trapping heat within the Earth's atmosphere, leading to rising global temperatures and shifts in climate patterns. (A) Signup and view all the answers

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Flashcards

Physics and Measurement

Units of measurements, System of Units, S I Units, dimensions of Physics quantities, dimensional analysis.

Kinematics

Motion in a straight line, Position-time graph, speed and velocity, Vector addition, relative motion

Laws of Motion

Force and inertia, Newton's Laws of Motion, conservation of linear momentum, friction

Work, Energy, and Power

Work done, kinetic and potential energies, work-energy theorem, power, conservation of mechanical energy.