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Medical Undergraduate Admissions (MBBS/BDS) MCQs
Practice Medical Undergraduate Admissions (MBBS/BDS) multiple-choice questions for NTA competitive exams. Each question includes the correct answer and a short explanation, and past-paper questions are marked so you can revise both repeated and fresh material in one place.
It is zero
It is directed towards the center
It is directed along the tangent
It is constant in both magnitude and direction
وضاحتIn uniform circular motion, the velocity changes direction continuously, resulting in centripetal acceleration directed toward the center.
[ML^2T^-1]
[MLT^-1]
[ML^2T^-2]
[ML^-1T^-1]
وضاحتSince E = hf, h = E/f. Energy (E) has dimensions [ML^2T^-2] and frequency (f) has [T^-1], resulting in [ML^2T^-1].
It remains zero.
It is directed toward the center of the circle.
It is directed outward from the center.
It is constant in both magnitude and direction.
وضاحتIn uniform circular motion, the speed is constant, but the direction changes, resulting in centripetal acceleration pointing toward the center.
[ML^2T^-1]
[MLT^-2]
[ML^2T^-2]
[M^-1L^2T]
وضاحتSince Energy (E) = h * frequency (f), h = E / f. Units are (kg·m²/s²) / (1/s) = kg·m²/s.
10 m
20 m
30 m
40 m
وضاحتUsing v² = u² + 2as, where v=0, u=20, a=-10. 0 = 400 - 20s, so s = 20m.
Force is independent of momentum.
Force is directly proportional to the rate of change of momentum.
Force is inversely proportional to momentum.
Force is the product of mass and momentum.
وضاحتNewton's second law states that the net force applied is equal to the rate of change of linear momentum (F = dp/dt).
1 ohm
2 ohms
6 ohms
8 ohms
وضاحتIn a series circuit, resistors are added directly: R_total = R1 + R2 = 2 + 4 = 6 ohms.
Positive
Negative
Zero
Infinite
وضاحتAcceleration is the rate of change of velocity. If velocity is constant, the rate of change is zero.
Energy
Power
Angular momentum
Force
وضاحتAngular momentum (L) has units of (kg·m²/s), which simplifies to Joule-second.
It remains the same
It increases by a factor of square root of 2
It doubles
It becomes half
وضاحتEscape velocity is given by v = sqrt(2GM/R). If M is doubled, v becomes sqrt(2) times the original.
Temperature
Pressure
Heat content
Volume
وضاحتBy definition, an adiabatic process is one where no heat is exchanged with the surroundings (dQ=0).
Weber
Henry
Tesla
Farad
وضاحتThe Henry (H) is the SI unit of electrical inductance.
Red
Yellow
Green
Violet
وضاحتViolet light has the shortest wavelength and thus the highest refractive index in glass, causing maximum deviation.
Oxygen
Fluorine
Nitrogen
Chlorine
وضاحتFluorine is the most electronegative element in the periodic table due to its small size and high effective nuclear charge.
sp
sp2
sp3
dsp2
وضاحتMethane consists of one carbon atom bonded to four hydrogen atoms, resulting in four sigma bonds and sp3 hybridization.
Fluorine
Chlorine
Bromine
Iodine
وضاحتElectronegativity increases across a period and decreases down a group; Fluorine is the most electronegative element.
Linear
Trigonal planar
Tetrahedral
Octahedral
وضاحتIn methane, the carbon atom is sp³ hybridized, which leads to a tetrahedral geometry with 109.5-degree angles.
pH = 7
pH > 7
pH < 7
pH = 14
وضاحتA pH less than 7 indicates an acidic solution, with lower values indicating higher acidity.
1s² 2s² 2p⁶ 3s²
1s² 2s² 2p⁶ 3s¹
1s² 2s² 2p⁶ 3s² 3p¹
1s² 2s² 2p⁵ 3s²
وضاحتMagnesium has 12 electrons, filling the shells as 1s2, 2s2, 2p6, and 3s2.
Charles's Law
Boyle's Law
Avogadro's Law
Dalton's Law
وضاحتBoyle's law defines the pressure-volume relationship: P1V1 = P2V2 at constant temperature.
Lithium
Sodium
Potassium
Rubidium
وضاحتAs you move down a group in the periodic table, the number of electron shells increases, increasing the atomic radius.
2 moles
3 moles
4 moles
5 moles
وضاحتThe reaction is CH4 + 2O2 -> CO2 + 2H2O. For 1 mole of methane, 2 moles of O2 are needed, so for 2 moles, 4 are required.
H2O
CO2
NH3
CH4
وضاحتCarbon dioxide has an sp hybridized carbon atom, resulting in a bond angle of 180 degrees and a linear structure.
Formic acid
Acetic acid
Propionic acid
Butyric acid
وضاحتCH3COOH is the chemical formula for acetic acid, commonly known as vinegar in dilute form.
Protons only
Electrons and protons
Protons and neutrons
Neutrons only
وضاحتAtomic mass is the sum of the number of protons and neutrons in the nucleus.
4
6
8
12
وضاحتIn a sodium chloride (NaCl) rock-salt structure, each Na+ ion is surrounded by 6 Cl- ions.
Phloem
Xylem
Cortex
Pith
وضاحتXylem tissue is specialized for the upward conduction of water and dissolved minerals in vascular plants.
Glucose
Oxygen and ATP/NADPH
Carbon dioxide
Starch
وضاحتThe light reactions split water to release oxygen and store energy in the form of ATP and NADPH for use in the Calvin cycle.
Phloem
Xylem
Cortex
Epidermis
وضاحتXylem is the specialized tissue responsible for the upward conduction of water and dissolved minerals from the roots.
Glucose production
ATP and NADPH
Carbon dioxide fixation
Starch accumulation
وضاحتLight-dependent reactions convert solar energy into chemical energy in the form of ATP and NADPH.
Mitochondria
Nucleus
Chloroplast
Ribosome
وضاحتChloroplasts contain chlorophyll, the pigment that captures light energy for photosynthesis.
Oxygen
Nitrogen
Carbon dioxide
Hydrogen
وضاحتPlants take in CO2 from the atmosphere to synthesize glucose through the Calvin cycle.
Auxin
Gibberellin
Ethylene
Cytokinin
وضاحتEthylene is a gaseous plant hormone that promotes fruit maturation and ripening.
Chloroplast
Mitochondria
Ribosome
Golgi apparatus
وضاحتMitochondria are known as the powerhouse of the cell because they perform aerobic respiration to produce ATP.
Xylem
Phloem
Epidermis
Cortex
وضاحتPhloem is the vascular tissue responsible for translocation of organic nutrients like sucrose.
G1 phase
S phase
G2 phase
M phase
وضاحتDNA synthesis or replication occurs during the 'S' (Synthesis) phase of interphase.
Respiration
Photosynthesis
Transpiration
Absorption
وضاحتTranspiration is the evaporative loss of water from the aerial parts of a plant, primarily through stomata.
Carotene
Chlorophyll
Xanthophyll
Anthocyanin
وضاحتChlorophyll is the primary pigment that absorbs light energy, primarily in the blue and red regions of the spectrum.
Stamen
Anther
Ovary
Petal
وضاحتThe male gametes travel to the ovary where they fertilize the ovule, which then develops into a seed.
Liver
Lungs
Kidneys
Heart
وضاحتThe kidneys filter blood to remove waste products like urea and balance body fluids through urine formation.
Red blood cells
Platelets
White blood cells
Plasma
وضاحتWhite blood cells (leukocytes) are essential components of the immune system that fight off pathogens and infections.
Liver
Lungs
Kidneys
Heart
وضاحتThe kidneys filter blood to remove waste products like urea, forming urine in the process.
Red blood cells
White blood cells
Platelets
Plasma cells
وضاحتWhite blood cells (leukocytes) are responsible for fighting infections and foreign invaders.
Right atrium
Right ventricle
Left atrium
Left ventricle
وضاحتThe left ventricle is the strongest chamber and pumps oxygen-rich blood through the aorta to the rest of the body.
To pump blood
To release hormones
To digest food
To produce impulses
وضاحتThe endocrine system consists of glands that secrete hormones directly into the bloodstream to regulate body functions.
Amylase
Lipase
Pepsin
Trypsin
وضاحتPepsin is the primary digestive enzyme in the stomach that initiates the breakdown of proteins into peptides.
Fighting infection
Clotting blood
Transporting oxygen
Producing antibodies
وضاحتRed blood cells contain hemoglobin, which binds to oxygen to transport it throughout the body.
Pancreas
Liver
Gallbladder
Stomach
وضاحتThe liver produces bile, which is then stored in the gallbladder and released into the small intestine to aid fat digestion.
Cerebrum
Cerebellum
Medulla oblongata
Hypothalamus
وضاحتThe cerebellum is the part of the brain that coordinates voluntary movements, balance, and muscle tone.
Vitamin C
Vitamin K
Vitamin A
Vitamin E
وضاحتGut flora (intestinal bacteria) synthesize Vitamin K, which is essential for the process of blood clotting.
Neuron
Nephron
Alveoli
Villi
وضاحتThe nephron is the microscopic unit that filters blood and forms urine in the kidneys.
Thyroid gland
Adrenal gland
Pituitary gland
Pineal gland
وضاحتThe pituitary gland is called the master gland because it produces hormones that regulate the activity of many other endocrine glands.
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Frequently Asked Questions
Are these Medical Undergraduate Admissions (MBBS/BDS) MCQs free?
Yes. Every Medical Undergraduate Admissions (MBBS/BDS) MCQ on this page is free to practice, including the correct answer and explanation.
Do these include past-paper questions?
Yes — questions sourced from past papers are clearly marked with a "Past Paper" badge, alongside fresh practice questions.
Which exams do these Medical Undergraduate Admissions (MBBS/BDS) MCQs help with?
They are aimed at NTA and related Pakistani competitive exams that test Medical Undergraduate Admissions (MBBS/BDS).
How should I practice subject-wise MCQs?
Attempt each question first, then reveal the answer and read the explanation. Short, focused sessions on one subject work better than long unstructured reading.