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MCQOPTIONS
This section includes 132 Mcqs, each offering curated multiple-choice questions to sharpen your AIIMS MBBS knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
One hormone hastens maturity period in juvenile conifers, a second hormone controls xylem differentiation, while the third hormone increases the tolerance of plants to various stresses. They are respectively |
| A. | Gibberellin, Auxin, Ethylene |
| B. | Auxin, Gibberellin, Cytokinin |
| C. | Gibberellin, Auxin, ABA |
| D. | Auxin, Gibberellin, ABA. |
| Answer» D. Auxin, Gibberellin, ABA. | |
| 52. |
Most animals that live in deep oceanic waters are |
| A. | tertiary consumers |
| B. | detritivores |
| C. | primary consumers |
| D. | secondary consumers. |
| Answer» C. primary consumers | |
| 53. |
Retrogressive metamorphosis occurs in |
| A. | Hemichordata |
| B. | Cephalochordata |
| C. | Urochordata |
| D. | Vertebrata. |
| Answer» D. Vertebrata. | |
| 54. |
Which one of the following is not a mammalian character? |
| A. | Presence of milk producing glands |
| B. | Skin is unique in possessing hair |
| C. | Presence of external ears called pinnae |
| D. | Homodont type of dentition |
| Answer» E. | |
| 55. |
Pseudostratified epithelium is found in |
| A. | seminiferous tubule |
| B. | Fallopian tube |
| C. | trachea |
| D. | kidney tubules |
| Answer» D. kidney tubules | |
| 56. |
Cornea transplant in humans is almost never rejected. This is because |
| A. | it is composed of enucleated cells |
| B. | it is a non-living layer |
| C. | its cells are least penetrable by bacteria |
| D. | it has no blood supply. |
| Answer» E. | |
| 57. |
The correct sequence of stages in the evolution of modern man (Homo sapiens), is |
| A. | Homo erectus, Australopithecus, neanderthal man, cro-magnon man, modern man |
| B. | Australopithecus, Homo erectus, Neanderthal man, cro-magnon man, modern man |
| C. | Neanderthal man, Australopithecus, cro-magnon man, Homo erectus, modern man |
| D. | Australopithecus, Neanderthal man, cro-magnon man, Homo erectus, modern man |
| Answer» C. Neanderthal man, Australopithecus, cro-magnon man, Homo erectus, modern man | |
| 58. |
If both parents are carriers for thalassaemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child? |
| A. | 25% |
| B. | 100% |
| C. | No chance |
| D. | 50% |
| Answer» B. 100% | |
| 59. |
Which of the following is used as bioinsecticide? |
| A. | Bacillus polymyxa |
| B. | Cylindrospermum licheniforme |
| C. | Phytophthora palmivora |
| D. | Chrysanthemum cinerarifolium |
| Answer» E. | |
| 60. |
Which of the following statements is correct regarding menstrual cycle? |
| A. | LH induces rupturing of Graafian follicle. |
| B. | Proliferative phase is characterized by the increased production of progesterone. |
| C. | Corpus luteum secretes large amount of estrogen. |
| D. | Both LH and FSH attain a peak level in secretory phase. |
| Answer» B. Proliferative phase is characterized by the increased production of progesterone. | |
| 61. |
Select the incorrect match. |
| A. | Citric acid – Aspergillus niger |
| B. | Streptokinase - Streptococcus |
| C. | Butyric acid – Clostridium acetobutylicum |
| D. | Cyclosporin-A – Monascus purpureus |
| Answer» E. | |
| 62. |
The genetic material in tobacco mosaic virus is |
| A. | ss DNA |
| B. | ss RNA |
| C. | ds RNA |
| D. | ds DNA |
| Answer» C. ds RNA | |
| 63. |
Which of the following is the correct scientific name of wheat derived by binominal nomenclature? |
| A. | Triticum Vulgare |
| B. | Triticum aestivum |
| C. | Oryza sativa |
| D. | Zea mays |
| Answer» C. Oryza sativa | |
| 64. |
Which of the following are homosporous pteridophytes? I. Selaginella II. Lycopodium III. Salvinia IV. Equisetum |
| A. | I and IV only |
| B. | II and III only |
| C. | II and IV only |
| D. | III and IV only |
| Answer» D. III and IV only | |
| 65. |
Assertion : In electrolysis, the quantity of electricity needed for depositing 1 mole silver is different from that required for 1 mole of copper. Reason : The molecular weights of silver and copper and different. |
| A. | If both assertion and reason are true and reason is the correct explanation of assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of assertion. |
| C. | If assertion is true but reason is false. |
| D. | If both assertion and reason are false. |
| Answer» C. If assertion is true but reason is false. | |
| 66. |
Assertion : A solution of sucrose in water is dextrorotatory. But on hydrolysis in the presence of a little hydrochloric acid, it becomes laevorotatory. Reason : Sucrose on hydrolysis gives unequal amounts of glucose and fructose. As a result of this, change in sign of rotation is observed. |
| A. | If both assertion and reason are true and reason is the correct explanation of assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of assertion. |
| C. | If assertion is true but reason is false. |
| D. | If both assertion and reason are false. |
| Answer» D. If both assertion and reason are false. | |
| 67. |
Assertion : The Dumas method is more applicable to nitrogen containing organic compounds than the Kjeldahl’s method. Reason : The Kjeldahl’s method does not give satisfactory results for compounds in which nitrogen is directly linked to oxygen. |
| A. | If both assertion and reason are true and reason is the correct explanation of assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of assertion. |
| C. | If assertion is true but reason is false. |
| D. | If both assertion and reason are false. |
| Answer» C. If assertion is true but reason is false. | |
| 68. |
Assertion : 2-Methyl-1, 3-butadiene is the monomer of natural rubber. Reason : Natural rubber is formed through anionic addition polymerization. |
| A. | If both assertion and reason are true and reason is the correct explanation of assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of assertion. |
| C. | If assertion is true but reason is false. |
| D. | If both assertion and reason are false. |
| Answer» D. If both assertion and reason are false. | |
| 69. |
Assertion : A reaction which is spontaneous and accompanied by decrease of randomness must be exothermic. Reason : All exothermic reactions are accompanied by decrease of randomness. |
| A. | If both assertion and reason are true and reason is the correct explanation of assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of assertion. |
| C. | If assertion is true but reason is false. |
| D. | If both assertion and reason are false |
| Answer» D. If both assertion and reason are false | |
| 70. |
Assertion : Staggered conformation of ethane is 12.5 kJ mol−1 more stable than the eclipsed conformation. Reason : The two conformations of ethane cannot be separated at room temperature. |
| A. | If both assertion and reason are true and reason is the correct explanation of assertion |
| B. | If both assertion and reason are true but reason is not the correct explanation of assertion. |
| C. | If assertion is true but reason is false. |
| D. | If both assertion and reason are false. |
| Answer» C. If assertion is true but reason is false. | |
| 71. |
Assertion : Diamagnetic substances are not attracted by magnetic field. Reason : Diamagnetic substances have no unpaired electrons. |
| A. | If both assertion and reason are true and reason is the correct explanation of assertion |
| B. | If both assertion and reason are true but reason is not the correct explanation of assertion. |
| C. | If assertion is true but reason is false |
| D. | If both assertion and reason are false. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of assertion. | |
| 72. |
Assertion : Phenol is more acidic than ethanol. Reason : Phenoxide ion is resonance stabilized. |
| A. | If both assertion and reason are true and reason is the correct explanation of assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of assertion. |
| C. | If assertion is true but reason is false. |
| D. | If both assertion and reason are false. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of assertion. | |
| 73. |
Assertion : Charcoal is used in separation of noble gases. Reason : Charcoal has porous structure. |
| A. | If both assertion and reason are true and reason is the correct explana of assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of assertion. |
| C. | If assertion is true but reason is false. |
| D. | If both assertion and reason are false. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of assertion. | |
| 74. |
Assertion : For hydrogen like species, energy of an electron in a particular orbit increases with increase in value of Z. Reason : Electronegativity decreases across a period. |
| A. | If both assertion and reason are true and reason is the correct explanation of assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of assertion |
| C. | If assertion is true but reason is false. |
| D. | If both assertion and reason are false |
| Answer» D. If both assertion and reason are false | |
| 75. |
Assertion : Generally alkali and alkaline earth metals form superoxides. Reason : There is single bond between O and O in superoxides. |
| A. | If both assertion and reason are true and reason is the correct explanation of assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of assertion. |
| C. | If assertion is true but reason is false. |
| D. | If both assertion and reason are false. |
| Answer» E. | |
| 76. |
Assertion : Acetone and aniline shows negative deviations. Reason : H-bonding between acetone and aniline is stronger than that between acetone-acetone and aniline-aniline. |
| A. | If both assertion and reason are true and reason is the correct explanation of assertion |
| B. | If both assertion and reason are true but reason is not the correct explanation of assertion. |
| C. | If assertion is true but reason is false. |
| D. | If both assertion and reason are false. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of assertion. | |
| 77. |
Assertion : Chlorobenzene is more reactive than benzene towards the electrophilic substitution reaction. Reason : Resonance destabilizes the carbocation. |
| A. | If both assertion and reason are true and reason is the correct explanation of assertion |
| B. | If both assertion and reason are true but reason is not the correct explanation of assertion. |
| C. | If assertion is true but reason is false. |
| D. | If both assertion and reason are false. |
| Answer» E. | |
| 78. |
Assertion : When acetamide reacts with NaOH and Br2, methyl amine is formed. Reason : The reaction occurs through intermediate formation of isocyanate. |
| A. | If both assertion and reason are true and reason is the correct explanation of assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of assertion. |
| C. | If assertion is true but reason is false |
| D. | If both assertion and reason are false. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of assertion. | |
| 79. |
Among the following, the achiral amino acids is |
| A. | 2-ethylalanine |
| B. | 2-methylglycine |
| C. | 2-hydroxymethylserine |
| D. | tryptophyan. |
| Answer» D. tryptophyan. | |
| 80. |
Arsenic drugs are mainly used in the treatment of |
| A. | Jaundice |
| B. | Typhoid |
| C. | Syphilis |
| D. | Cholera. |
| Answer» D. Cholera. | |
| 81. |
Oil used as frothing agent in froth-floatation process is |
| A. | pine oil |
| B. | mustard oil |
| C. | coconut oil |
| D. | olive oil. |
| Answer» B. mustard oil | |
| 82. |
Which is not classified as thermoplastics? |
| A. | Polyethylene |
| B. | Polystyrene |
| C. | Bakelite |
| D. | Neoprene |
| Answer» D. Neoprene | |
| 83. |
An element (X) belongs to fourth period and fifteenth group of the periodic table. Which one of the followi configuration of (X)? It has |
| A. | partially filled d orbitals and completely filled s orbital |
| B. | completely filled s orbital and completely filled p orbitals |
| C. | completely filled s orbital and half filled p orbitals |
| D. | half-filled d orbitals and completely filled s orbital |
| Answer» D. half-filled d orbitals and completely filled s orbital | |
| 84. |
Two elements A and B form compounds of formula AB2 and AB4. When dissolved in 20.0 g of benzene 1.0 g of AB2 lowers f. pt. by 2.3℃ whereas 1.0 g of AB4 lowers f. pt. by 1.3℃. The Kf for benzene is 5.1. The atomic masses of A and B are |
| A. | 25, 42 |
| B. | 42, 25 |
| C. | 52, 48 |
| D. | 48, 52 |
| Answer» B. 42, 25 | |
| 85. |
The heat liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at 25℃ and it increases the temperature of 18.94 kg of water by 0.632℃. If the specific heat of water at 25℃ is 0.998 cal/g-deg, the value of the heat of combustion of benzoic acid is |
| A. | 881.1 kcal |
| B. | 771.12 kcal |
| C. | 981.1 kcal |
| D. | 871.2 kcal |
| Answer» C. 981.1 kcal | |
| 86. |
10 mL of liquid carbon disulphide (specific gravity 2.63) is burnt is oxygen. Find the volume of the resulting gases measured at STP. |
| A. | 23.25 L |
| B. | 22.26 L |
| C. | 23.50 L |
| D. | 20.08 L |
| Answer» B. 22.26 L | |
| 87. |
Which of the following species is not aromatic? |
| A. | Benzene |
| B. | Cyclooctatetraenyl dianion |
| C. | Tropylium ion |
| D. | Cyclopentadienyl cation |
| Answer» E. | |
| 88. |
A first order reaction, which is 30% complete in 30 minutes has a half-life period of |
| A. | 102.2 min |
| B. | 58.2 min |
| C. | 24.2 min |
| D. | 120.2 min |
| Answer» C. 24.2 min | |
| 89. |
The reaction, C6H5ONa + CO2 + H2O → C6H5OH + NaHCO3 suggests that |
| A. | phenol is a stronger acid than carbonic acid |
| B. | carbonic acid is a stronger acid than phenol |
| C. | water is stronger acid than phenol |
| D. | None of these |
| Answer» C. water is stronger acid than phenol | |
| 90. |
Large difference in boiling points is observed in |
| A. | N and P |
| B. | P and As |
| C. | As and Sb |
| D. | Sb and Bi |
| Answer» D. Sb and Bi | |
| 91. |
Paints and hair creams are respectively |
| A. | sol and emulsion |
| B. | aerosol and foam |
| C. | emulsion and sol |
| D. | foam and gel. |
| Answer» B. aerosol and foam | |
| 92. |
For which of the following elements it is difficult to disproportionate in +3 oxidation state? |
| A. | N |
| B. | As |
| C. | Sb |
| D. | Bi |
| Answer» E. | |
| 93. |
Assertion : When an object is placed between two plane parallel mirrors, then all the images found are of equal intensity. Reason : In case of plane parallel mirrors, only two images are possible. |
| A. | If both assertion and reason are true and reason is the correct explanation of assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of assertion. |
| C. | If assertion is true but reason is false. |
| D. | If both assertion and reason are false. |
| Answer» E. | |
| 94. |
Assertion : At resonance, LCR series circuit have a minimum current. Reason : At resonance, in LCR series circuit, the current and e.m.f. are not in phase with each other. |
| A. | If both assertion and reason are true and reason is the correct explanation of assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of assertion. |
| C. | If assertion is true but reason is false. |
| D. | If both assertion and reason are false. |
| Answer» E. | |
| 95. |
Assertion : Electrons in the atom are held due to coulomb forces. Reason : The atom is stable only because the centripetal force due to Coulomb’s law is balanced by the centrifugal force. |
| A. | If both assertion and reason are true and reason is the correct explanation of assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of assertion. |
| C. | If assertion is true but reason is false. |
| D. | If both assertion and reason are false. |
| Answer» D. If both assertion and reason are false. | |
| 96. |
Assertion : The specific heat of a gas in an adiabatic process is zero and in an isothermal process is infinite. Reason : Specific heat of gas is directly proportional to change of heat in system and inversely proportional to change in temperature. |
| A. | If both assertion and reason are true and reason is the correct explanation of assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of assertion. |
| C. | If assertion is true but reason is false. |
| D. | If both assertion and reason are false. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of assertion. | |
| 97. |
Assertion : The graph of potential energy and kinetic energy of a particle in SHM with respect to position is a parabola. Reason : Potential energy and kinetic energy do not vary linearly with position. |
| A. | If both assertion and reason are true and reason is the correct explanation of assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of assertion. |
| C. | If assertion is true but reason is false. |
| D. | If both assertion and reason are false. |
| Answer» C. If assertion is true but reason is false. | |
| 98. |
Assertion : Value of radius of gyration of a body depends on axis of rotation. Reason : Radius of gyration is root mean square distance of particle of the body from the axis of rotation. |
| A. | If both assertion and reason are true and reason is the correct explanation of assertion |
| B. | If both assertion and reason are true but reason is not the correct explanation of assertion. |
| C. | If assertion is true but reason is false. |
| D. | If both assertion and reason are false. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of assertion. | |
| 99. |
Assertion : Magnetic field lines are continuous and closed. Reason : Magnetic monopole does not exist. |
| A. | If both assertion and reason are true and reason is the correct explanation of assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of assertion. |
| C. | If assertion is true but reason is false. |
| D. | If both assertion and reason are false. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of assertion. | |
| 100. |
Assertion : KE is conserved at every instant of elastic collision. Reason : NO deformation of matter occurs in elastic collision. |
| A. | If both assertion and reason are true and reason is the correct explanation of assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of assertion. |
| C. | If assertion is true but reason is false. |
| D. | If both assertion and reason are false. |
| Answer» E. | |