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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
ExplanationIn 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]
ExplanationSince 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.
ExplanationIn 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]
ExplanationSince 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
ExplanationUsing 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.
ExplanationNewton'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
ExplanationIn a series circuit, resistors are added directly: R_total = R1 + R2 = 2 + 4 = 6 ohms.
Positive
Negative
Zero
Infinite
ExplanationAcceleration is the rate of change of velocity. If velocity is constant, the rate of change is zero.
Energy
Power
Angular momentum
Force
ExplanationAngular 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
ExplanationEscape velocity is given by v = sqrt(2GM/R). If M is doubled, v becomes sqrt(2) times the original.
Temperature
Pressure
Heat content
Volume
ExplanationBy definition, an adiabatic process is one where no heat is exchanged with the surroundings (dQ=0).
Weber
Henry
Tesla
Farad
ExplanationThe Henry (H) is the SI unit of electrical inductance.
Red
Yellow
Green
Violet
ExplanationViolet light has the shortest wavelength and thus the highest refractive index in glass, causing maximum deviation.
Oxygen
Fluorine
Nitrogen
Chlorine
ExplanationFluorine is the most electronegative element in the periodic table due to its small size and high effective nuclear charge.
sp
sp2
sp3
dsp2
ExplanationMethane consists of one carbon atom bonded to four hydrogen atoms, resulting in four sigma bonds and sp3 hybridization.
Fluorine
Chlorine
Bromine
Iodine
ExplanationElectronegativity increases across a period and decreases down a group; Fluorine is the most electronegative element.
Linear
Trigonal planar
Tetrahedral
Octahedral
ExplanationIn 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
ExplanationA 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
ExplanationMagnesium has 12 electrons, filling the shells as 1s2, 2s2, 2p6, and 3s2.
Charles's Law
Boyle's Law
Avogadro's Law
Dalton's Law
ExplanationBoyle's law defines the pressure-volume relationship: P1V1 = P2V2 at constant temperature.
Lithium
Sodium
Potassium
Rubidium
ExplanationAs 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
ExplanationThe 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
ExplanationCarbon 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
ExplanationCH3COOH is the chemical formula for acetic acid, commonly known as vinegar in dilute form.
Protons only
Electrons and protons
Protons and neutrons
Neutrons only
ExplanationAtomic mass is the sum of the number of protons and neutrons in the nucleus.
4
6
8
12
ExplanationIn a sodium chloride (NaCl) rock-salt structure, each Na+ ion is surrounded by 6 Cl- ions.
Phloem
Xylem
Cortex
Pith
ExplanationXylem tissue is specialized for the upward conduction of water and dissolved minerals in vascular plants.
Glucose
Oxygen and ATP/NADPH
Carbon dioxide
Starch
ExplanationThe 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
ExplanationXylem 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
ExplanationLight-dependent reactions convert solar energy into chemical energy in the form of ATP and NADPH.
Mitochondria
Nucleus
Chloroplast
Ribosome
ExplanationChloroplasts contain chlorophyll, the pigment that captures light energy for photosynthesis.
Oxygen
Nitrogen
Carbon dioxide
Hydrogen
ExplanationPlants take in CO2 from the atmosphere to synthesize glucose through the Calvin cycle.
Auxin
Gibberellin
Ethylene
Cytokinin
ExplanationEthylene is a gaseous plant hormone that promotes fruit maturation and ripening.
Chloroplast
Mitochondria
Ribosome
Golgi apparatus
ExplanationMitochondria are known as the powerhouse of the cell because they perform aerobic respiration to produce ATP.
Xylem
Phloem
Epidermis
Cortex
ExplanationPhloem is the vascular tissue responsible for translocation of organic nutrients like sucrose.
G1 phase
S phase
G2 phase
M phase
ExplanationDNA synthesis or replication occurs during the 'S' (Synthesis) phase of interphase.
Respiration
Photosynthesis
Transpiration
Absorption
ExplanationTranspiration is the evaporative loss of water from the aerial parts of a plant, primarily through stomata.
Carotene
Chlorophyll
Xanthophyll
Anthocyanin
ExplanationChlorophyll is the primary pigment that absorbs light energy, primarily in the blue and red regions of the spectrum.
Stamen
Anther
Ovary
Petal
ExplanationThe male gametes travel to the ovary where they fertilize the ovule, which then develops into a seed.
Liver
Lungs
Kidneys
Heart
ExplanationThe kidneys filter blood to remove waste products like urea and balance body fluids through urine formation.
Red blood cells
Platelets
White blood cells
Plasma
ExplanationWhite blood cells (leukocytes) are essential components of the immune system that fight off pathogens and infections.
Liver
Lungs
Kidneys
Heart
ExplanationThe kidneys filter blood to remove waste products like urea, forming urine in the process.
Red blood cells
White blood cells
Platelets
Plasma cells
ExplanationWhite blood cells (leukocytes) are responsible for fighting infections and foreign invaders.
Right atrium
Right ventricle
Left atrium
Left ventricle
ExplanationThe 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
ExplanationThe endocrine system consists of glands that secrete hormones directly into the bloodstream to regulate body functions.
Amylase
Lipase
Pepsin
Trypsin
ExplanationPepsin is the primary digestive enzyme in the stomach that initiates the breakdown of proteins into peptides.
Fighting infection
Clotting blood
Transporting oxygen
Producing antibodies
ExplanationRed blood cells contain hemoglobin, which binds to oxygen to transport it throughout the body.
Pancreas
Liver
Gallbladder
Stomach
ExplanationThe 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
ExplanationThe cerebellum is the part of the brain that coordinates voluntary movements, balance, and muscle tone.
Vitamin C
Vitamin K
Vitamin A
Vitamin E
ExplanationGut flora (intestinal bacteria) synthesize Vitamin K, which is essential for the process of blood clotting.
Neuron
Nephron
Alveoli
Villi
ExplanationThe nephron is the microscopic unit that filters blood and forms urine in the kidneys.
Thyroid gland
Adrenal gland
Pituitary gland
Pineal gland
ExplanationThe pituitary gland is called the master gland because it produces hormones that regulate the activity of many other endocrine glands.
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.