PMDC MDCAT 2025

Which part of the brain contains central chemoreceptors that monitor CO₂ levels in blood?

Which component of a reflex arc connects the sensory neuron to the motor neuron within the spinal cord?

The 9.3.3.1 ratio of law of Independent assortment can be affected by:

Best description of the process of crossing over during meiosis:

Total number of linkage groups in a normal human is:

Nissls granule is a specialized structure in neuron formed by modification of:

What is the function of a centromere?

All are the functions of lysosome EXCEPT:

Kidneys perform their osmoregulatory role under the effect of Antidiuretic Hormone, which type of urine is produced in this situation?

Which part of brain controls transition between sleeping and wakefulness?

The first consequence of lymphatic blockage in tissues is

Which of the following is the auditory relay Centre and Centre that controls reflex movement of eyes?

Which of the following is the correct pathway of nerve impulse?

The neurotransmitters are secreted by the neuron from:

The pubic symphysis is a slightly moveable joint joined by which of the following tissue?

Hippocampus plays an important role in the:

In a pea plant seed color is determined by one gene, with yellow (dominant) and green (recessive). Which parental cross would most likely result in offspring showing a 1:1 ratio of yellow to green seeds?

Enzymes activity decreases at very low or high pH because:

The complementary base pairing in DNA is important because it:

Mendel crossed a plant with round yellow seeds (RRYY) and was a plant with wrinkled green seeds (rryy), what was the phenotype of all F₁ offspring?

A mature duplicated chromosome consists of:

The most primitive respiratory process occurring in a living cell is;

In normal 28 days menstrual cycle when would you expect the LH surge to occur?

Receive, retain and nourish a fertilized ovum is the main function of:

Which property of water helps in moderating Earth's climate and maintaining stable temperature in aquatic environment?

The primary function of larynx is:

During menstrual cycle, luteinizing hormone (LH) is secreted due to;

Effect of increased substrate concentration on enzyme activity:

An oligosaccharide is made up of at least:

Left and right cerebral hemispheres are connected with each other by:

Which is the common feature between cardiac and smooth muscles?

Which statement best explains the difference between humoral and cell mediated immune responses?

The Joints which cause rotational movements are

Self-fertilization in plants through successive generations can lead to the development of:

Which part of the neuron typically receives incoming signals from other neurons?

Why thick filaments are unable to bind with thin filament in a relaxed muscle fiber?

Which of the following is the correct higher (left) to lower (right) sequence of molecules involved in the flow of genetic information in the cell?

A person in hot weather is unable to maintain body temperature. Which physiological response is absent?

Which of the following best highlights the importance of proteins in immunity?

The secondary structure of proteins is stabilized by:

The following is an example of a globular protein

The main idea in Darwin's Theory of "Origin of species by natural selection" is:

The process of osmoregulation refers to:

A baby girl is born with hemophilia, which is an X-linked recessive disorder. What are the most likely genotypes of her parents?

Which of the following is a key feature of RNA?

Which of the following types of RNA makeup the largest proportion of total cellular RNA?

Identify the most appropriate function of chromosomes

The bacterium Treponema Pallidum is responsible for which sexually transmitted disease?

Enzymes belong to which class of biomolecules?

_ arranges the DNA into the chromosomes in a eukaryotic cell

Tissue fluid in a lymphatic system is called as:

The function of nucleolus is to make:

Which one of the following biomolecules is a polymer/polysaccharide?

Which of the following blood vessels have lowest blood velocity with correct reason for low blood velocity?

Olfactory receptors are the type of:

An active athlete has more stamina of running compared to an officer of same age with physically inactive lifestyle. Which of the following organelles has greatly increased in the muscle cells of athlete?

Which of the following organisms eliminate nitrogenous waste mainly in the form of uric acid?

Once an action potential reaches the membrane of a skeletal muscle fiber, what is the first event that occurs in the contraction process?

Which of the following cells possess Nissl's granules?

Which part of human brain is involved in maintaining the posture and balance of the body?

Arthritis is:

Which type of joint is present in pubis?

Which type of neurons stimulate muscles to contract in a reflex arc?

Reversible inhibitors differ from irreversible inhibitors because they:

Why are retroviruses placed in a separate class of RNA viruses?

Peptide bonds are Important in protein because they:

Which is an enzyme activator secreted by the intestinal glands:

According to Lock and Key model, the active site is regarded as:

Which of the following statements best compares cell division in prokaryotic and Eukaryotic cells?

In which of the following combination, both components have Hyaline cartilage?

Which of the following best describes "acquired characteristics" according to Lamarckism?

Which of the following muscle types are involuntary in action?

Which of the following characters is shared by both skeletal and cardiac muscles?

The main role of mRNA during protein synthesis is to:

Which layer of uterus nourishes the embryo after implantation?

If a normal person marries with colour blind female what will be the possibility of normal male child:

A student observed a boundary in both plant and animal cells that controls entry and exit of substances. Which of the following structures is likely being observed?

According to Lamarck, the evolution of lon necks in giraffes is explained by:

The process of spermatogenesis occurs in which part of the male reproductive system?

Glycoproteins are formed as a result of the combination of:

In which of the following combinations, both components have non-striated muscle fibers?

The organelles only found at seeding stage in oil seed plants are:

Which option is CORRECT about endospore?

Which set of quantum numbers is not allowed for an electron:

FISCHER ESTERIFICATION is which type of reaction:

Pick the order of ease of reduction of H⁺¹,Cu⁺² and Ag⁺¹:

Acetaldehyde undergoes oxidation to produce acetic acid, In this reaction oxidizing agent used is

Which one of the following has higher vapour pressure?

Terminal alkynes show acidic character due to:

Shape of orbital is determined by quantum number:

The theories which explain the formation of sigma and pi bond are EXCEPT:

The value of Planck's constant is:

Final equation for the representation of rate of reaction in term of concentration is called:

Poly vinyl chloride (PVC) is the type of?

Which of the following is true about pressure for an ideal gas at -273° C?

Which of the following is a basic buffer?

What happens when H⁺ is added to ammonium hydroxide and ammonium chloride buffer?

What is general requirement for free radical substitution reaction of ethane and halogen?

Which one of the following is not a characteristic of benzene?

Correct arrangement of orbital according to size of hybridized orbitals:

Consider the equation H₂ + O₂H₂O, what volume of hydrogen gas is required to produce 1 mol of water at standard temperature & pressure?

A chemical reaction has a theoretical yield of 25g, but only 20g of product was obtained. What is the percentage yield of the reaction?

Which of the following situations most clearly demonstrates a key characteristic of a Redox reaction?

Number of unpaired electrons in Boron in ground state is/are:

Chlorination of benzene in the presence of iron (III) chloride involves mechanism of:

If 100 kJ of heat is absorbed by the system and 40 kJ of work is done on the system what is the change of internal energy?

The element with smallest value of Ionization energy is:

Carboxylic acid reacts with ammonia to form ammonium salts which on heating produces:

Number of unpaired electrons present in the ground state of Fe³⁺ (Atomic number of Fe=26):

If % yield and actual yield is 80 and 20 g respectively, what will be theoretical yield?

Which of the following best identifies the redox reaction?

Molecules having one lone pair and three bond pairs have geometrical shape:

Conversion of dihaloalkane into alkyne does not involve:

Majority of reactions taking place at ordinary temperatures with H are:

Which one of the following is a coinage metal:

Value of R gas constant in J mol^-1 K^-1 is:

Which of the following best explains why phenol reacts with aqueous NaOH, but alcohols do not?

In propene pi-bond is formed by sideway overlap of:

Oxidation numbers of X, Y Z are +6, -2, & -1 respectively, possible molecular formula when atoms combine:

An enzyme used to decompose the lipids into fatty acids in our alimentary canal is:

Methanol is produced by reduction of:

Consider the given balanced chemical equation: 2H₂​+O₂​→2H₂​O

If 4 g of H₂ reacts with 32 g of O₂ to produce 28 g of H₂O, what is the percentage yield of the reaction?

(Molar mass of H₂ = 2 g/mol, O₂ = 32 g/mol, and H₂O = 18 g/mol)

The amount of energy needed to weaken the existing bonds to an extent that can be broken through collision is called:

For 2A + 2B → 3C, which of the following does not express the reaction rate?

IUPAC name of (CH₃)₃CCH₂Br is:

Which one shows anisotropic behavior?

In a unit cell of a crystal lattice the angle β is between faces:

Pick the crystalline solid:

In a pipe of varying cross-section as fluid enters the narrower region, it exhibits:

The curved shape of an airplane wing causes air to move faster over the top surface. This leads to:

The protons in the nucleus of an atom DO NOT exit out due to

Mechanical waves cannot travel through outer space because they:

Terminal voltage of a cell equals its EMF only when:

If a loop moves toward a stationary magnet, the induced current will:

The energy of a Simple Harmonic oscillation depends upon the

The wave that has the highest frequency and penetrating power is

According to First law of thermodynamics when heat flows into a system and no work is done, the internal energy of the system must

If the length of the conductor is made 4 times its original length, its resistance becomes

The unit of temperature coefficient of resistivity is

The work done by the gravitational force on an object as it moves from a reference level to a higher point is:

If two speakers emit sound at same frequency and phase, maximum loudness occurs when:

When an object attains terminal velocity, its acceleration is:

A 0.5 kg ball moving at 6 m/s has kinetic energy

A fluid is flowing through a tube, to undergo transition from laminar to turbulent flow it's velocity must be:

For two equal positive charges, the electric field weakest?

A projectile is launched in air with certain angle; its velocity is maximum at:

If the distance between two charges is halved and magnitude of charges are also doubled, then the force between these charges becomes:

If a body having mass m₁ = 2kg, moving with 5 m/s approaches another mass m₂= 3kg with speed of 1 m/s in same direction, relative speed of approach is 4 m/s. Relative speed of separation after collision will be:

If P is the momentum of an object and m is its mass, then its kinetic energy is:

The electric field at a point due to two equal and opposite charges is 100 N/C. If the magnitude of each charge is doubled then the electric field at that point becomes:

If a plastic sheet of relative permittivity 2.5 is inserted between two point charges placed in a vacuum, then the electrostatic force between them

After 3 half-lives, the remaining fraction of a radioactive sample is:

If the horizontal range of a projectile becomes half of its maximum possible horizontal range, the probable angle of projection is:

In an ideal transformer, if the primary voltage is doubled and the turns ratio remains the same, what happens to the secondary current?

An angular displacement of 90° is equal to:

A phase difference of 90° is equal to:

The reciprocal of the resistivity of a material is called its:

The Balmer series of hydrogen spectrum appears in the

A ball is thrown into the air with certain velocity v making an angle θ with horizontal. If air resistance is neglected, then at maximum height, its velocity is:

A canon is placed on a smooth surface. When it fires a shell, the canon moves backward, this recoil occurs due to:

Earth receives large amount of energy directly from:

The time in which half of the given number of radioactive nuclei decay is known as

If the surface charge density of an infinite sheet increases by 25% the electric field intensity:

An incompressible fluid flows through a pipe that becomes narrower in one section. The fluid speed increases in that region to maintain:

Which of the following sentence has correct subject verb agreement?

The keys were found _ the drawer where you left them last week.

Identify the sentence among of the following, which is punctuated correctly?

She was elated when she got first position In exams.” What is the meaning of “elated” In this sentence?

The board of directors expressed _ disappointment with the financial results.

It rained all night; _, the roads were flooded in the morning.

The manager accepted the cashier’s _ for coming late.

The writer has unearthed serious irregularities in the entire project. The word ‘unearthed’ in this sentence means

Identify the sentence with no spelling error:

All daffodils are plants. All plants are living things. Some living things are real.Conclusions:

I. All daffodils are living things.

II. Some living things are flowers.

III. All daffodils are real.

Which conclusions follow?

One apple pie has 10 slices, and each apple pie feeds five people. Henry is having a party with 200 people. How many slices of pie does he need?

How many trees are in the orchard?

Which of the statements below are needed to sufficiently answer this question?

I. Ibrahim is a farmer and looks after half of the trees in the orchard

II. 300 trees in the orchard are under Ibrahim’s care

Asad bought 50 packets of biscuits for the price of Rs. 500; whereas Anum bought 25 packets of chips for the price of Rs. 1000. While comparing the prices of packets of biscuits and chips, which of the following statements is correct?

The virus spreads rapidly in the town. It infected the people – First day: 8, Second day: 16, Third day: 32. What will the number of people infected on the next day?

Which of the following is a result of poor design that could cause an accident in the workplace?

Which of the following is the main cause of accidents involving equipment?

P, Q and R are M’s parents. M and N are siblings. Q is N’s mother. What is P to M?

What will come next? 1, 4, 2, 5, 3, 6, 4, 7, ?