Sukkur IBA Testing Services
Questions are transcribed word for word from the original paper, so the odd spelling mistake you see is in the scan rather than added by us. We leave them as printed - “correcting” an exam question is how you end up testing something the paper never asked, and some questions are about spelling. Tell us if one is unreadable.
Tap a subject to practise it across every paper in the archive.
Overconsumption of which of the following foods increases the risk of calcium oxalate stone?
Explanation
Many leafy vegetables (e.g. spinach, beet greens) are high in oxalate, which can combine with calcium to form calcium oxalate kidney stones. The other options are not primary dietary sources of oxalate that increase risk.
Which product is produced by genetically modified bacteria for patients with Diabetes mellitus?
Explanation
Recombinant insulin is produced by genetically modified bacteria (e.g. E. coli) and is the standard biologic used to treat diabetes. The other listed proteins can be produced recombinantly as well, but insulin is the classic example for diabetes therapy.
Which changes occur in the endometrium during the proliferate phase of the menstrual cycle?
Explanation
During the proliferative phase (driven by estrogen) the endometrium regenerates and thickens in preparation for possible implantation. Shedding occurs during menstruation, and the secretory phase follows ovulation under progesterone influence.
Role of mRNA in COVID-19 vaccines like Pfizer and Moderna is to:
Explanation
mRNA vaccines deliver the genetic instructions for the viral spike protein into host cells so those cells produce the protein and present it to the immune system. This differs from directly delivering antibodies or enzymes; the mRNA's role is to instruct protein synthesis.
Living cells of cartilage are called as:
Explanation
Chondrocytes are the mature cells that maintain cartilage matrix. Osteocytes and osteoblasts are bone cells, and thrombocytes are platelets—none are cartilage cells.
The regulator of muscle contraction, which is released from sarcoplasmic reticulum is:
Explanation
The sarcoplasmic reticulum stores and releases Ca2+; released calcium binds troponin to permit actin–myosin interaction and contraction. Tropomyosin and troponin are regulatory proteins, not the SR-released ion; ATP provides energy.
153 more questions in this paper
Get every question in SIBA MDCAT 2025 Past Paper (Paper C) - plus every other paper, unlimited full-length mocks and sectional tests you can retake as often as you like, and the most-repeated MCQ packs.
Or Rs 6,000 a year - 50% cheaper, and it covers a retake.
Automatic and rapid actions that do not involve the conscious part of brain is:
Answer and explanation locked
Crossing over involves exchange of genetic material between:
Answer and explanation locked
Name the biomolecule essential for information storage and transmission within cells.
Answer and explanation locked
What is the chemical composition of chromosomes?
Answer and explanation locked
Which of the following surrounds myofibril in skeletal muscle that stores and distributes calcium ions during muscle functioning?
Answer and explanation locked
Shivering thermogenesis involves:
Answer and explanation locked
Guanine - cytosine pairs enhance DNA stability due to:
Answer and explanation locked
Which of the following neurons conduct impulses from sensory receptors to CNS:
Answer and explanation locked
Why Lamarck is being remembered till today?
Answer and explanation locked
Which of the following is NOT related to DNA?
Answer and explanation locked
If a male with hemophilia marries a non-carrier female, what is the likelihood of their sons inheriting the condition?
Answer and explanation locked
Which of the following is a characteristic of a non-competitive enzyme inhibitor?
Answer and explanation locked
Which of the following event prevent backflow of blood from ventricles to atria during ventricular systole?
Answer and explanation locked
In the following process the cells release energy from oxidation of food molecules?
Answer and explanation locked
How many NADH are produced, when one Acetyl co-A is oxidized during Krebs's cycle?
Answer and explanation locked
Which of the following best describes glycoproteins?
Answer and explanation locked
The function which is common between Cerebellum and Hippocampus is;
Answer and explanation locked
In males, which of the following is considered a urogenital organ?
Answer and explanation locked
The most common type of arthritis is:
Answer and explanation locked
The other name for Interstitial cells in male testes is:
Answer and explanation locked
Binding of hemoglobin with oxygen is catalyzed by the enzyme:
Answer and explanation locked
Transfer of phosphate from one compound to the other compound requires an enzyme called:
Answer and explanation locked
Linkage of genes in Drosophila was first discovered by:
Answer and explanation locked
Which phenomenon increases the chances of variations?
Answer and explanation locked
When antibodies produced by B-cells, kill the antigens then it is called:
Answer and explanation locked
B-Lymphocytes are formed and matured in:
Answer and explanation locked
Which of the following is a route of HIV transmission?
Answer and explanation locked
Which part of small intestine is responsible for nutrient absorption?
Answer and explanation locked
Water can circulate in living organisms due to:
Answer and explanation locked
If the disease is caused due to a defective gene located on the X chromosome, then defectives gene can only be transmitted to male offspring by the:
Answer and explanation locked
Which group of viruses can cause diseases like influenza, measles and rabies?
Answer and explanation locked
Which of the following biological molecule releases highest energy from its one gram?
Answer and explanation locked
The best way to avoid AIDS is:
Answer and explanation locked
Which of the following substances pass through the glomerulus into Bowman's capsule?
Answer and explanation locked
The appendix is attached to which part of large intestine?
Answer and explanation locked
Which structural characteristic is most accurate for arteries?
Answer and explanation locked
A food sample contains long chains of amino acids bounded together. This indicates the presence of:
Answer and explanation locked
Monoclonal antibodies are useful in cancer diagnosis by:
Answer and explanation locked
The main function of the pharynx in respiratory system:
Answer and explanation locked
The main cause of acute kidney failure is:
Answer and explanation locked
During diastole, the heart chambers:
Answer and explanation locked
Kidneys perform their osmoregulatory role under the effect of Antidiuretic Hormone, which type of urine is produced in this situation?
Answer and explanation locked
A person has swollen lymph nodes after throat infection. What does this indicate?
Answer and explanation locked
Which of the following is correct about the structure of brain?
Answer and explanation locked
Under a microscope plant cells appeared rigid in shape, unlike flexible animal cells. Which structure explain this difference?
Answer and explanation locked
Which type of joint allows bending of the elbow joint and has a synovial cavity?
Answer and explanation locked
If a round seeded pea plant is self-fertilized and all of its offspring are also round seeded:
Answer and explanation locked
A student observes a microorganism under a microscope that lacks a nucleus and is made of a single cell. Which classification would best fit this organism?
Answer and explanation locked
In biotechnology vaccines can be developed by cloning of:
Answer and explanation locked
Atrioventricular valve closed during which phase of cardiac cycle:
Answer and explanation locked
If "RRYy" is crossed with "rryy", what will be the ratio of "RRYy" to "rryy" in F2 generation?
Answer and explanation locked
Name the idea of Darwin that best explains the ability of populations to reproduce those individuals who possess beneficial traits.
Answer and explanation locked
At least how many saccharide units must be present in polysaccharide?
Answer and explanation locked
A doctor taps below the knee and the leg kicks forward. What does this show?
Answer and explanation locked
If fertilization does not occur, which part of uterus degenerate?
Answer and explanation locked
Which process uses mRNA to make protein at ribosomes?
Answer and explanation locked
Which of the following is the sexually transmitted disease?
Answer and explanation locked
The Golgi apparatus is structurally made of a series of flattened membrane bounded sacs.
Answer and explanation locked
Which type of change is a nerve impulse?
Answer and explanation locked
Which of the following fluid flows through the lymphatic vessels?
Answer and explanation locked
Which one of the following is the most common nitrogenous waste excreted in urine of a healthy human?
Answer and explanation locked
Hippocampus mainly involved in:
Answer and explanation locked
The covalently bonded non protein part of enzyme is called: -
Answer and explanation locked
The outer surface of the axon membrane in a resting neuron is:
Answer and explanation locked
Which class of animals excrete ammonia as their primary nitrogenous waste?
Answer and explanation locked
Which of the following best describes the direction of impulse traveling in a typical neuron?
Answer and explanation locked
Homopolysaccharide that is found in the cell wall of fungi and in the exoskeleton of arthropods is:
Answer and explanation locked
The most abundant lipids in living things are:
Answer and explanation locked
Name the type of bond that join amino acids to form a polypeptide chain:
Answer and explanation locked
Which of the following is not a globular protein?
Answer and explanation locked
Which specialized cells of liver perform phagocyte function?
Answer and explanation locked
According to Darwin, the main force behind evolution is:
Answer and explanation locked
Beside fertilization, the function of fallopian tube is:
Answer and explanation locked
Which property of water allows it to stick to polar surface like wood?
Answer and explanation locked
The water content of human kidney is regulated by ADH. Which of the following gland is involved in its secretion process?
Answer and explanation locked
The heat of formation of CO and CO2 are -26.4 Kcal and -94.0 Kcal respectively. The heat of combustion of carbon monoxide according to Hess's Law will be:
Answer and explanation locked
Rate of dehydration of alcohol is:
Answer and explanation locked
For which reaction, the value of Kc increases with increase in temperature?
Answer and explanation locked
Correct order of bond energy will be:
Answer and explanation locked
Which of the following is least volatile?
Answer and explanation locked
IUPAC name of the compound is CH3(CH2)CH(CH3)2:
Answer and explanation locked
IUPAC name of the compound C2H5CH=C(CCH3) C2H5 is :
Answer and explanation locked
Which of the following molecules have similar molecular shape?
Answer and explanation locked
Value of electronegativity of atoms A and B are 1.20 and 4.0 respectively, the percent ionic character will be:
Answer and explanation locked
Phenol differs from ethanol because it:
Answer and explanation locked
Which reagent and condition are used to bring about the reaction shown? Toluene --> p-chloro toluene
Answer and explanation locked
What is 50% yield when actual yield and theoretical yield are 2 g and 4 g respectively?
Answer and explanation locked
IUPAC name of CHCCl is:
Answer and explanation locked
The order of reactivity of following R-X for SN reaction is:
Answer and explanation locked
Which of the following is expected to be the most paramagnetic?
Answer and explanation locked
The formation of activated complex in a reaction is:
Answer and explanation locked
The maximum probability of finding an electron is at a distance of:
Answer and explanation locked
100. The IUPAC name of Vinyl acetylene is:
Answer and explanation locked
101. Which atom has at least single electron in dumbell shape orbital?
Answer and explanation locked
102. Which of following adhesive is used to bond broken pieces of jewelry?
Answer and explanation locked
103. Ratio of sigma bonds and pi bonds present in benzene are:
Answer and explanation locked
104. Which one is addition polymer?
Answer and explanation locked
105. When one mole of a substance is decomposed preferably as compared to evaporation then decomposition has:
Answer and explanation locked
106. At start of reaction:
Answer and explanation locked
107. Which is not true about benzene:
Answer and explanation locked
108. During Clemmenson reduction of aldehyde and ketone, carbonyl group into alkane group is carried out with:
Answer and explanation locked
109. Consider the given reaction: N2 + 3H2 --> 2NH3 If 56 g of N2 reacts with 12 g of H2 and produces 51 g of NH3, what is the theoretical yield (TY) of NH3 and the percentage yield (PY) of the reaction? (Molar mass of N2 = 28 g/mol, H2 = 2 g/mol and NH3 = 17 g/mol)
Answer and explanation locked
110. When SHE is connected with Cu electrode using salt bridge and external wire:
Answer and explanation locked
111. The ionic compound among the following with the highest lattice energy is:
Answer and explanation locked
112. All of following have two bond pairs and show linear geometry except:
Answer and explanation locked
113. If ionization energy of an element is greater then:
Answer and explanation locked
114. Which compound will not show geometrical isomerism:
Answer and explanation locked
115. The mass of hydrogen gas needed to produce 51 g ammonia:
Answer and explanation locked
116. Digestion of protein started when food enters in:
Answer and explanation locked
117. Select the standard condition for temperature and pressure:
Answer and explanation locked
Which of the following is NOT a state function?
Answer and explanation locked
Which one is not a type of stereoisomerism?
Answer and explanation locked
Formic acid reacts with ethanol in presence of acid catalyst produces:
Answer and explanation locked
K is called specific rate constant because it is:
Answer and explanation locked
Number of sigma bonds in methyl chloride is due to sp3 overlap is/are:
Answer and explanation locked
When pressure is 1520 torr then density of oxygen gas will be:
Answer and explanation locked
Which equation is used to calculate concentration for n mole of an ideal gas?
Answer and explanation locked
50.0 g Mg is burnt with 32g of oxygen to form MgO, amount of excess reagent left is?
Answer and explanation locked
Which carbonyl carbon is more electrophilic:
Answer and explanation locked
An electron is projected along the positive x-axis in a magnetic field lying in xz-plane. The magnetic force on the electron will act along the:
Answer and explanation locked
The magnetic flux through a loop of 1m^2 in a 0.5T magnetic field is same as magnetic flux through a loop of 0.5 m^2 in a magnetic field of:
Answer and explanation locked
A body of mass 10 kg is falling through a viscous medium and reached terminal velocity. The net force on the body will be:
Answer and explanation locked
The value of temperature co-efficient of a conductor is zero. This indicates that with the rise in temperature, resistance of conductor:
Answer and explanation locked
The path difference between two sound waves coming from a coherent source of wavelength 50 cm at a point is 100 cm. The superposition of the waves at that point produces:
Answer and explanation locked
Potential energy decreases in the process of:
Answer and explanation locked
A diver of mass m is swimming at a depth h below the sea level. If the reference level is taken at sea level, the gravitational potential energy of the diver is:
Answer and explanation locked
A constant force F acts on a body and displaces it by distance Δd in a time Δt. The rate at which force is doing work is:
Answer and explanation locked
In circular motion, if angular displacement is kept constant, decreasing the radius will:
Answer and explanation locked
When force and displacement are in opposite direction then the work done is said to be:
Answer and explanation locked
In a step-up transformer, if the secondary voltage is increased by a factor of 10, the current in secondary coil will be:
Answer and explanation locked
When a droplet reaches terminal velocity, its acceleration is:
Answer and explanation locked
Newton's original formula underestimated speed of sound in air because he:
Answer and explanation locked
The point where the electric field is zero between two opposite charge lies:
Answer and explanation locked
Consider these two vectors A = 2i + 3j and B = -6i + 4j. The angle between these two vectors is:
Answer and explanation locked
A displacement time graph is a straight line inclined up at angle of 45° with X-axis, velocity of body according to this graph is:
Answer and explanation locked
A 150 kg car has its velocity reduced from 20 m/s to 10 m/s in 3.0 sec. How large was the average retarding force?
Answer and explanation locked
The phenomenon of interference of sound waves requires:
Answer and explanation locked
A gas expands from 1 m^3 to 3 m^3 at constant pressure of 2 Pa. Work done is:
Answer and explanation locked
If frequency of AC is doubled, the inductive reactance will:
Answer and explanation locked
The force between two charges is 28 N in vacuum. If paraffin wax of relative permittivity 2.8 is introduced between the charges as a medium, then the force reduces to:
Answer and explanation locked
A body moves along a semicircular path of radius 10 m from one end of the diameter to the other. The ratio of distance to displacement is:
Answer and explanation locked
A body is projected with speed v making an angle θ with the horizontal and covers horizontal range R. If its speed is doubled, the new range will be:
Answer and explanation locked
A ball of mass m strikes a wall and rebounds with the same speed in the opposite direction, taking the initial direction as positive, the change in the momentum of the ball is:
Answer and explanation locked
A point lies 3m from a +5µC charge and 4m from a -3µC charge. The most appropriate direction of the net electric field at this point is directed:
Answer and explanation locked
The increase in kinetic energy associated with decreased pressure of a fluid in a horizontal pipe is a consequence of the:
Answer and explanation locked
The electric field at a point due to a point charge is 200N/C. If suppose a -4C test charge is placed at that point then the magnitude of electric field and electric force on it is:
Answer and explanation locked
Internal resistance reduces the terminal voltage because it:
Answer and explanation locked
The angle formed at the center of a circle as a body moves from one position to another is:
Answer and explanation locked
During the drilling of a metal surface the drill bit heats up. This heat comes from the:
Answer and explanation locked
If 2J of work is done in moving two coulombs of charge from one point to the other in an electric field. The potential difference between the points is:
Answer and explanation locked
The motion of transverse waves involves particle's vibration:
Answer and explanation locked
In laminar flow of fluid, its adjacent layers:
Answer and explanation locked
A body moving in a circle, half revolution in terms of radians is equivalent to:
Answer and explanation locked