MDCAT Quiz

Question 1 of 180

The coordination number of NaCl crystal lattice is:

A 4 B 6 C 8 D 12

Question 2 of 180

The molecular geometry of BF3 is:

A Bent B Trigonal planar C Tetrahedral D Pyramidal

Question 3 of 180

Which of the following is a density-independent factor?

A Competition B Predation C Natural disaster D Disease

Question 4 of 180

The reaction of ethene with water and acid gives:

A Ethanal B Ethanoic acid C Ethanol D Ethane

Question 5 of 180

The IUPAC name of CH3CH2OH is:

A Methanol B Ethanol C Propanol D Butanol

Question 6 of 180

The Contact process catalyst is:

A Iron B Nickel C Vanadium pentoxide (V2O5) D Platinum

Question 7 of 180

Which test distinguishes aldehydes from ketones?

A Litmus test B Baeyer\'s test C Fehling\'s test D Tollen\'s test

Question 8 of 180

The central dogma of molecular biology describes the flow of information as:

A DNA -> Protein -> RNA B RNA -> DNA -> Protein C DNA -> RNA -> Protein D Protein -> RNA -> DNA

Question 9 of 180

Which process extracts gold?

A Roasting B Smelting C Cyanide process D Electrolysis

Question 10 of 180

Which of the following is an example of a symbiotic relationship?

A Predation B Parasitism C Competition D Commensalism

Question 11 of 180

Avogadro\'s number represents:

A 6.022 x 10^23 particles per mole B 6.022 x 10^22 particles per mole C 3.011 x 10^23 particles per mole D 1.602 x 10^-19 C

Question 12 of 180

The colour of precipitate when NaOH is added to FeCl3:

A White B Blue C Reddish brown D Green

Question 13 of 180

The process by which plants lose water vapor through leaves is:

A Translocation B Transpiration C Osmosis D Diffusion

Question 14 of 180

The standard enthalpy of formation of an element in its standard state is:

A Zero B 1 kJ/mol C -1 kJ/mol D Depends on the element

Question 15 of 180

Which of the following is an example of a vector-borne disease?

A Tuberculosis B Malaria C Cholera D Hepatitis B

Question 16 of 180

Which biogeochemical cycle does NOT have a gaseous phase?

A Carbon cycle B Nitrogen cycle C Water cycle D Phosphorus cycle

Question 17 of 180

Which of the following is an electrolyte?

A Sugar solution B Sodium chloride solution C Distilled water D Ethanol

Question 18 of 180

The process by which cells divide to form two identical daughter cells is called:

A Meiosis B Mitosis C Binary fission D Cytokinesis

Question 19 of 180

Number of atoms in one mole of O2 is:

A 6.022 x 10^23 B 1.2044 x 10^24 C 3.011 x 10^23 D 6.022 x 10^24

Question 20 of 180

The process of protein synthesis from mRNA is called:

A Replication B Transcription C Translation D Transformation

Question 21 of 180

In a food chain, the organism that feeds on producers is called:

A Primary consumer B Secondary consumer C Tertiary consumer D Decomposer

Question 22 of 180

Which of the following is an exothermic reaction?

A Photosynthesis B Melting of ice C Evaporation of water D Combustion of methane

Question 23 of 180

The chemical formula of glucose is:

A C6H12O6 B C12H22O11 C C2H5OH D CH3COOH

Question 24 of 180

The pH of human blood is maintained around:

A 6.4 B 7.0 C 7.4 D 8.0

Question 25 of 180

The white blood cell that produces antibodies is the:

A Neutrophil B Eosinophil C B-lymphocyte D Monocyte

Question 26 of 180

Which of the following is a covalent compound?

A NaCl B CCl4 C KBr D MgO

Question 27 of 180

In Mendel\'s law of segregation, alleles separate during:

A Mitosis B Fertilization C Gamete formation D Growth

Question 28 of 180

The functional group present in aldehydes is:

A -CHO B -OH C -COOH D -CO-

Question 29 of 180

The shape of ammonia (NH3) is:

A Linear B Trigonal planar C Tetrahedral D Trigonal pyramidal

Question 30 of 180

The bond formed between amino acids is called:

A Glycosidic bond B Peptide bond C Phosphodiester bond D Hydrogen bond

Question 31 of 180

The product of complete combustion of a hydrocarbon is always:

A CO2 and water B CO and water C CO2 and hydrogen D CO and hydrogen

Question 32 of 180

Which is a Lewis base?

A BF3 B AlCl3 C NH3 D H+

Question 33 of 180

Lipids are characterized by their insolubility in:

A Organic solvents B Chloroform C Water D Benzene

Question 34 of 180

Gas solubility in water generally increases with:

A Increase in temperature B Decrease in temperature C Increase in pressure only D No change

Question 35 of 180

Which is a strong oxidizing agent?

A Na B KMnO4 C Fe D Cu

Question 36 of 180

Which organelle is known as the kitchen of the cell?

A Mitochondria B Ribosome C Chloroplast D Vacuole

Question 37 of 180

The crystal structure of NaCl is:

A BCC B FCC C HCP D Simple cubic

Question 38 of 180

Which of the following is an endothermic process?

A Dissolution of ammonium nitrate in water B Burning of natural gas C Neutralization of acid and base D Condensation of steam

Question 39 of 180

The product of ethanol and ethanoic acid is:

A Ethanal B Ethyl ethanoate C Diethyl ether D Ethanol

Question 40 of 180

DNA stands for:

A Deoxyribonucleic acid B Dinitrogen acid C Deoxynitrate acid D Dioxyribonucleic acid

Question 41 of 180

Which hormone promotes cell elongation in plants?

A Cytokinin B Abscisic acid C Auxin D Ethylene

Question 42 of 180

The process by which a population becomes better suited to its environment over time is:

A Genetic drift B Mutation C Natural selection D Gene flow

Question 43 of 180

Which structure is found in plant cells but NOT in animal cells?

A Mitochondria B Ribosome C Cell wall D Cell membrane

Question 44 of 180

DNA replication occurs during which phase of the cell cycle?

A G1 phase B S phase C G2 phase D M phase

Question 45 of 180

Which is an electrophile?

A NH3 B Cl- C H+ D OH-

Question 46 of 180

What is the term for the genetic makeup of an organism?

A Phenotype B Genotype C Allele D Locus

Question 47 of 180

pH of a neutral solution at 25 degrees C is:

A 0 B 14 C 1 D 7

Question 48 of 180

The electronic configuration of Cl- ion is:

A 2, 8, 7 B 2, 8, 8 C 2, 8, 6 D 2, 7, 8

Question 49 of 180

Enzymes are biological catalysts made of:

A Lipids B Carbohydrates C Proteins D Nucleic acids

Question 50 of 180

Which of the following metals is extracted by electrolysis?

A Aluminium B Iron C Copper D Zinc

Question 51 of 180

Which gas is known as laughing gas?

A N2O B NO C NO2 D N2

Question 52 of 180

The process of conversion of starch into sugar during seed germination involves:

A Amylase B Lipase C Protease D Pepsin

Question 53 of 180

Fossils are best described as:

A Living organisms B Preserved remains of ancient organisms C Genetic mutations D Embryonic structures

Question 54 of 180

Which compound contains both ionic and covalent bonds?

A NaCl B NaOH C H2O D CH4

Question 55 of 180

Which of the following is a characteristic of enzymes?

A They are consumed in reactions B They increase activation energy C They are specific to substrates D They work at all temperatures

Question 56 of 180

Protons, neutrons, and electrons in 14C6 are respectively:

A 6, 8, 6 B 6, 6, 8 C 8, 6, 6 D 6, 14, 6

Question 57 of 180

Which of the following is NOT a function of the liver?

A Bile production B Detoxification C Insulin production D Glycogen storage

Question 58 of 180

The bond angle in water is approximately:

A 180 degrees B 120 degrees C 109.5 degrees D 104.5 degrees

Question 59 of 180

The colour of litmus paper in acidic solution is:

A Red B Blue C Green D Yellow

Question 60 of 180

The Hardy-Weinberg principle states that allele frequencies remain constant in the absence of:

A Mutation B Natural selection C Genetic drift D All of the above

Question 61 of 180

Which oxide reacts with both acids and bases?

A SO2 B Na2O C Al2O3 D Cl2O7

Question 62 of 180

Which is a primary alcohol?

A Propan-1-ol B Propan-2-ol C Butan-2-ol D 2-Methylpropan-2-ol

Question 63 of 180

Which part of the brain regulates body temperature?

A Cerebrum B Cerebellum C Hypothalamus D Thalamus

Question 64 of 180

The molar mass of water (H2O) is:

A 16 g/mol B 20 g/mol C 18 g/mol D 22 g/mol

Question 65 of 180

Which element belongs to Group 17 of the periodic table?

A Sodium B Chlorine C Oxygen D Argon

Question 66 of 180

Reaction rate generally increases with:

A Decrease in temperature B Increase in concentration C Increase in particle size D Removal of catalyst

Question 67 of 180

Which of the following elements has the highest electronegativity?

A Fluorine B Sodium C Silicon D Sulfur

Question 68 of 180

Which type of cell lacks a true nucleus?

A Plant cell B Animal cell C Prokaryotic cell D Eukaryotic cell

Question 69 of 180

During which process is the most ATP produced?

A Glycolysis B Krebs cycle C Electron transport chain D Fermentation

Question 70 of 180

Which vitamin is essential for blood clotting?

A Vitamin A B Vitamin B12 C Vitamin C D Vitamin K

Question 71 of 180

Which of the following is an example of a biotic component of an ecosystem?

A Soil B Water C Sunlight D Bacteria

Question 72 of 180

The greenhouse effect is primarily caused by:

A Oxygen B Nitrogen C Carbon dioxide D Hydrogen

Question 73 of 180

The structure that prevents food from entering the trachea is:

A Epiglottis B Glottis C Esophagus D Pharynx

Question 74 of 180

Which is used as antifreeze in radiators?

A Ethanol B Ethylene glycol C Methanol D Propanol

Question 75 of 180

Which is a strong base?

A NH3 B NaOH C CH3COOH D H2CO3

Question 76 of 180

Number of lone pairs on Xe in XeF4:

A 0 B 1 C 2 D 3

Question 77 of 180

Which is a reducing agent?

A O2 B Cl2 C H2 D F2

Question 78 of 180

Which of the following is an example of a codominant trait?

A Tallness in pea plants B ABO blood group C Color blindness D Sickle cell anemia

Question 79 of 180

The valency of aluminium in Al2O3 is:

A +1 B +2 C +3 D +4

Question 80 of 180

The site of gaseous exchange in the lungs is the:

A Bronchus B Trachea C Alveolus D Larynx

Question 81 of 180

Which type of reproduction results in genetically identical offspring?

A Sexual reproduction B Asexual reproduction C Cross-fertilization D Pollination

Question 82 of 180

Which kingdom includes mushrooms?

A Plantae B Animalia C Fungi D Protista

Question 83 of 180

Ethanol with acidified K2Cr2O7 gives:

A Ethanoic acid B Ethene C Ethyl acetate D Ethanal

Question 84 of 180

The empirical formula of glucose (C6H12O6) is:

A CH2O B C2H4O2 C C3H6O3 D C6H12O6

Question 85 of 180

Which of the following is produced during anaerobic respiration in muscles?

A Ethanol B Lactic acid C Acetic acid D Citric acid

Question 86 of 180

Product of reduction of nitrobenzene with Sn/HCl is:

A Nitrosobenzene B Aniline C Phenol D Benzoic acid

Question 87 of 180

The energy required to remove the outermost electron is called:

A Electron affinity B Ionization energy C Electronegativity D Lattice energy

Question 88 of 180

Which base pairs with Adenine in DNA?

A Cytosine B Guanine C Thymine D Uracil

Question 89 of 180

Which is a condensation polymer?

A Polyethene B Polypropene C Nylon-6,6 D Polystyrene

Question 90 of 180

Which of the following is a strong acid?

A Acetic acid B Hydrochloric acid C Carbonic acid D Phosphoric acid

Question 91 of 180

The process by which plants make food using sunlight is called:

A Respiration B Transpiration C Photosynthesis D Fermentation

Question 92 of 180

Which hormone regulates the menstrual cycle?

A Insulin B Estrogen C Adrenaline D Thyroxine

Question 93 of 180

The IUPAC name of CH3COOH is:

A Methanoic acid B Ethanoic acid C Propanoic acid D Ethanal

Question 94 of 180

Which blood group is considered the universal donor?

A A B B C AB D O

Question 95 of 180

Which of the following is a polysaccharide?

A Starch B Glucose C Fructose D Sucrose

Question 96 of 180

Which subatomic particle has no charge?

A Neutron B Proton C Electron D Alpha particle

Question 97 of 180

Homologous structures provide evidence for:

A Convergent evolution B Divergent evolution C Parallel evolution D Coevolution

Question 98 of 180

Which structure helps bacteria adhere to surfaces?

A Flagella B Pili C Capsule D Nucleoid

Question 99 of 180

The human genome contains approximately how many genes?

A 500 B 2,000 C 20,000-25,000 D 100,000

Question 100 of 180

Which of the following is the function of tRNA?

A Carries genetic code from DNA B Translates mRNA to protein C Transfers amino acids to ribosomes D Stores genetic information

Question 101 of 180

Which catalyst is used in the Haber process?

A Vanadium pentoxide B Iron C Platinum D Manganese dioxide

Question 102 of 180

The digestive enzyme pepsin is secreted by:

A Salivary glands B Stomach C Small intestine D Liver

Question 103 of 180

How many moles of CO2 from 1 mole of CaCO3 when heated?

A 0.5 mole B 1 mole C 2 moles D 1.5 moles

Question 104 of 180

The electron affinity of chlorine is:

A Negative, meaning energy is absorbed B Positive, meaning energy is released C Zero D Infinite

Question 105 of 180

Weight percent of carbon in methane (CH4) is:

A 25% B 50% C 75% D 80%

Question 106 of 180

The pH of 0.001 M HCl is:

A 1 B 2 C 3 D 4

Question 107 of 180

Which of the following oxides is amphoteric?

A Al2O3 B Na2O C SO3 D CaO

Question 108 of 180

The electronic configuration of Fe2+ ion is:

A [Ar] 3d6 B [Ar] 3d5 C [Ar] 3d4 D [Ar] 3d6 4s2

Question 109 of 180

A Punnett square is used to:

A Measure gene expression B Predict offspring genotypes C Count chromosomes D Analyze DNA sequences

Question 110 of 180

The movement of water from root to shoot against gravity is explained by:

A Root pressure B Cohesion-tension theory C Translocation D Imbibition

Question 111 of 180

The functional unit of the kidney is:

A Nephron B Neuron C Alveolus D Villus

Question 112 of 180

Which gas is released during photosynthesis?

A Carbon dioxide B Nitrogen C Oxygen D Hydrogen

Question 113 of 180

Which law states that mass is neither created nor destroyed in a reaction?

A Law of conservation of mass B Law of definite proportions C Law of multiple proportions D Gay-Lussac\'s law

Question 114 of 180

A mutation that results in a change of a single nucleotide is called:

A Chromosomal mutation B Point mutation C Deletion D Insertion

Question 115 of 180

Which of the following is a decomposer?

A Grass B Lion C Mushroom D Eagle

Question 116 of 180

Which of the following best describes an ecosystem?

A A group of the same species B Living organisms and their physical environment C A community of plants only D All organisms on Earth

Question 117 of 180

Which is a nucleophile?

A H+ B BF3 C OH- D Na+

Question 118 of 180

The Kp-Kc relationship for N2 + 3H2 to 2NH3 is:

A Kp = Kc B Kp = Kc(RT) C Kp = Kc(RT)^-2 D Kp = Kc(RT)^2

Question 119 of 180

Which of the following is an essential amino acid?

A Alanine B Glycine C Leucine D Serine

Question 120 of 180

Which hormone is produced by the pancreas to lower blood glucose?

A Glucagon B Insulin C Adrenaline D Thyroxine

Question 121 of 180

Noble gases have low boiling points because:

A They are highly reactive B They form covalent compounds C They have high ionization energies D They have weak van der Waals forces

Question 122 of 180

The bond order of O2 molecule is:

A 1 B 1.5 C 2 D 3

Question 123 of 180

The number of moles in 36 grams of water is:

A 1 mole B 2 moles C 3 moles D 4 moles

Question 124 of 180

Which of the following is an example of a prokaryote?

A Yeast B Amoeba C E. coli D Paramecium

Question 125 of 180

Which of the following is a connective tissue?

A Epithelium B Nervous tissue C Cartilage D Muscle tissue

Question 126 of 180

Which is an oxoacid of sulfur?

A H2SO4 B H2S C SO2 D SCl2

Question 127 of 180

The hybridization of carbon in methane (CH4) is:

A sp3 B sp C sp2 D sp3d

Question 128 of 180

Which organelle is responsible for protein synthesis?

A Lysosome B Ribosome C Peroxisome D Vacuole

Question 129 of 180

The process of converting a solid directly into gas is called:

A Melting B Sublimation C Condensation D Evaporation

Question 130 of 180

Which type of joint allows the widest range of movement?

A Suture B Hinge joint C Ball and socket joint D Pivot joint

Question 131 of 180

Sex-linked traits are most commonly associated with genes on:

A Chromosome 1 B Chromosome 21 C X chromosome D Autosome

Question 132 of 180

The shape of ammonia (NH3) is:

A Linear B Trigonal planar C Tetrahedral D Trigonal pyramidal

Question 133 of 180

The reaction of methane with chlorine in UV light is:

A Addition B Elimination C Condensation D Substitution

Question 134 of 180

Which is a diamagnetic species?

A O2 B NO C O2- D N2

Question 135 of 180

Which type of ecosystem has the highest biodiversity?

A Tundra B Desert C Tropical rainforest D Grassland

Question 136 of 180

The transfer of energy from producers to consumers is shown by:

A Food web B Energy pyramid C Biogeochemical cycle D Ecological succession

Question 137 of 180

Which of the following is an example of artificial selection?

A Antibiotic resistance in bacteria B Dog breeding C Industrial melanism D Darwin\'s finches

Question 138 of 180

Which enzyme joins Okazaki fragments?

A Helicase B Primase C Ligase D Polymerase

Question 139 of 180

The highest boiling point among alkanes is in:

A CH4 B C2H6 C C3H8 D C4H10

Question 140 of 180

Which of the following is a polysaccharide?

A Glucose B Amino acid C Starch D Fatty acid

Question 141 of 180

Which is a Lewis acid?

A NH3 B H2O C BF3 D OH-

Question 142 of 180

Which process increases genetic variation in populations?

A Mitosis B Asexual reproduction C Meiosis D Cloning

Question 143 of 180

Oxygen is transported in the blood primarily by:

A Plasma B White blood cells C Platelets D Hemoglobin in red blood cells

Question 144 of 180

The SI unit of pressure is:

A Pascal B Bar C Atmosphere D Torr

Question 145 of 180

What is the steric number of SF6?

A 4 B 5 C 6 D 7

Question 146 of 180

Which of the following is NOT a component of blood?

A Plasma B Hemoglobin C Platelets D Lymphocytes

Question 147 of 180

What is the atomic number of Carbon?

A 4 B 6 C 8 D 12

Question 148 of 180

The oxidation state of iron in Fe2O3 is:

A +2 B +4 C +3 D +6

Question 149 of 180

The electronic configuration of Cu (Z=29) is:

A [Ar] 3d9 4s2 B [Ar] 3d8 4s2 C [Ar] 3d10 4s2 D [Ar] 3d10 4s1

Question 150 of 180

Which is an addition reaction?

A CH2=CH2 + H2 to CH3CH3 B CH4 + Cl2 to CH3Cl + HCl C 2CH3CH2OH to CH3CH2OCH2CH3 + H2O D CH3COOH + NaOH to CH3COONa + H2O

Question 151 of 180

The largest gland in the human body is:

A Thyroid B Pancreas C Liver D Salivary gland

Question 152 of 180

Which compound shows geometrical isomerism?

A But-2-ene B Ethene C But-1-ene D Ethyne

Question 153 of 180

Which type of enzyme inhibition involves the inhibitor binding to the active site?

A Non-competitive inhibition B Competitive inhibition C Irreversible inhibition D Allosteric inhibition

Question 154 of 180

Which of the following is the correct sequence of biological organization?

A Cell -> Organ -> Tissue -> Organ system B Cell -> Tissue -> Organ -> Organ system C Tissue -> Cell -> Organ -> Organ system D Organ -> Tissue -> Cell -> Organ system

Question 155 of 180

Which part of a plant root absorbs water?

A Root cap B Root hairs C Cambium D Xylem

Question 156 of 180

The IUPAC name of CH3CH(OH)CH3 is:

A Propan-1-ol B 2-Methylpropan-1-ol C Butan-2-ol D Propan-2-ol

Question 157 of 180

Biodiversity refers to:

A Number of genes in a species B Variety of life in a given area C Number of cells in an organism D Rate of evolution

Question 158 of 180

Which is a strong dehydrating agent?

A Dilute H2SO4 B Dilute HCl C Dilute HNO3 D Concentrated H2SO4

Question 159 of 180

A cross between a heterozygous tall plant (Tt) and a homozygous short plant (tt) is called:

A Monohybrid cross B Dihybrid cross C Test cross D Back cross

Question 160 of 180

Which compound shows optical isomerism?

A Butane B Propane C 2-Butanol D Ethanol

Question 161 of 180

Which of the following is an example of co-dominance?

A Skin color B Height C Roan coat color in cattle D Tongue rolling

Question 162 of 180

Penicillin kills bacteria by inhibiting the synthesis of:

A Nucleic acids B Proteins C Cell wall D Cell membrane

Question 163 of 180

Atomic radii in a group:

A Increases down the group B Decreases down the group C Remains constant D First increases then decreases

Question 164 of 180

Which of the following is an abiotic factor?

A Bacteria B Temperature C Trees D Insects

Question 165 of 180

The enzyme that unwinds the DNA double helix during replication is:

A DNA polymerase B Helicase C Ligase D Primase

Question 166 of 180

Which type of muscle is involuntary and striated?

A Skeletal muscle B Cardiac muscle C Smooth muscle D All of the above

Question 167 of 180

Which of the following is a renewable natural resource?

A Coal B Petroleum C Solar energy D Natural gas

Question 168 of 180

Which gas is evolved when zinc reacts with dilute hydrochloric acid?

A Hydrogen B Oxygen C Chlorine D Carbon dioxide

Question 169 of 180

The oxidation number of Cr in K2Cr2O7 is:

A +3 B +4 C +5 D +6

Question 170 of 180

Which of the following is NOT a type of white blood cell?

A Neutrophil B Erythrocyte C Lymphocyte D Monocyte

Question 171 of 180

What type of bond is formed between Na and Cl in NaCl?

A Ionic bond B Covalent bond C Metallic bond D Hydrogen bond

Question 172 of 180

Boiling point increases in alkanes due to:

A Decrease in temperature B Increase in concentration C Increase in particle size D Stronger van der Waals forces

Question 173 of 180

Which of the following is a monosaccharide?

A Sucrose B Maltose C Fructose D Lactose

Question 174 of 180

Which quantum number describes the shape of an orbital?

A Principal (n) B Azimuthal (l) C Magnetic (ml) D Spin (ms)

Question 175 of 180

The sinoatrial (SA) node is the:

A Pacemaker of the heart B Heart valve C Blood vessel D Cardiac muscle

Question 176 of 180

IUPAC name of CH3CH(OH)CH3 is:

A Propan-1-ol B Propan-2-ol C 2-Methylpropan-1-ol D Butan-2-ol

Question 177 of 180

Cystic fibrosis is caused by a mutation in which gene?

A HBB gene B CFTR gene C BRCA1 gene D TP53 gene

Question 178 of 180

The theory of natural selection was proposed by:

A Gregor Mendel B Charles Darwin C Louis Pasteur D Watson and Crick

Question 179 of 180

The refractive error myopia is corrected by:

A Convex lens B Concave lens C Cylindrical lens D Bifocal lens

Question 180 of 180

Which organelle contains its own DNA?

A Golgi apparatus B Lysosome C Mitochondria D Smooth ER

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