MCQOPTIONS
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MCQOPTIONS
This section includes 106 Mcqs, each offering curated multiple-choice questions to sharpen your NEET-UG knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The most suitable method of separation of 1:1 mixture of ortho and para-nitrophenols is : |
| A. | Sublimation |
| B. | Chromatography |
| C. | Crystallisation |
| D. | Steam distillation |
| Answer» E. | |
| 2. |
Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field ? |
| A. | Na |
| B. | k |
| C. | Rb |
| D. | Li |
| Answer» E. | |
| 3. |
Which of the following is dependent on temperature ? |
| A. | Molality |
| B. | Molarity |
| C. | Mole fraction |
| D. | Weight percentage |
| Answer» C. Mole fraction | |
| 4. |
The heating of phenyl-methyl ethers with HI produces |
| A. | ethyl chlorides |
| B. | iodobenzene |
| C. | phenol |
| D. | benzene |
| Answer» D. benzene | |
| 5. |
Which of the incorrect statement? |
| A. | FeO0.98 has non stoichiometric metal deficiency defect. |
| B. | Density decreases in case of crystals with Schottky’s defect. |
| C. | NaCl(s) is insulator, silicon is semiconductor, silver is conductor, quartz is piezo electric crystal |
| D. | Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal |
| Answer» E. | |
| 6. |
A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy ∆U of the gas in joules will be: |
| A. | 1136.25 J |
| B. | −500 J |
| C. | −505 J |
| D. | +505 J |
| Answer» D. +505 J | |
| 7. |
The correct statement regarding electrophile is : |
| A. | Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from a nucleophile |
| B. | Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from another electrophile |
| C. | Electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile |
| D. | Electrophile can be either neutral or positively charged species and can form a bond by accepting a pair of electrons from a nucleophile |
| Answer» E. | |
| 8. |
If molality of the dilute solution is doubled, the value of molal depression constant (Kf) will be : |
| A. | doubled |
| B. | halved |
| C. | tripled |
| D. | unchanged |
| Answer» E. | |
| 9. |
Which one of the following statements is not correct? |
| A. | Catalyst does not initiate any reaction |
| B. | The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium |
| C. | Enzymes catalyse mainly bio-chemical reactions |
| D. | Coenzymes increase the catalytic activity of enzyme. |
| Answer» C. Enzymes catalyse mainly bio-chemical reactions | |
| 10. |
Which of the following reactions is appropriate for converting acetamide to methanamine ? |
| A. | Carbylamine reaction |
| B. | Hoffmann hypobromamide reaction |
| C. | Stephens reaction |
| D. | Gabriels phthalimide synthesis |
| Answer» C. Stephens reaction | |
| 11. |
Which of the following is a sink for CO ? |
| A. | Haemoglobin |
| B. | Micro organisms present in the soil |
| C. | Oceans |
| D. | Plants |
| Answer» C. Oceans | |
| 12. |
Mixture of chloroxylenol and terpineol acts as : |
| A. | analgesic |
| B. | antiseptic |
| C. | antipyretic |
| D. | antibiotic |
| Answer» C. antipyretic | |
| 13. |
An example of a sigma bonded organometallic compound is |
| A. | Ruthenocene |
| B. | Grignard’s reagent |
| C. | Ferrocene |
| D. | Cobaltocene |
| Answer» C. Ferrocene | |
| 14. |
The reason for greater range of oxidation states in actinoids is attributed to : |
| A. | The radioactive nature of actinoids |
| B. | Actinoid contraction |
| C. | 5f, 6d and 7s levels having comparable energies |
| D. | 4f and 5d levels being close in energies |
| Answer» D. 4f and 5d levels being close in energies | |
| 15. |
Young’s double slit experiment is first performed in air and then in a medium other than air. It is found that 8th bright fringe in the medium lies where 5th dark fringe lies in air. The refractive index of the medium is nearly : |
| A. | 1.25 |
| B. | 1.59 |
| C. | 1.69 |
| D. | 1.78 |
| Answer» E. | |
| 16. |
In a common emitter transistor amplifier the audio signal voltage across the collector is 3V. The resistance of collector is 3 kΩ. If current gain is 100 and the base resistance is 2kΩ, the voltage and power gain of the amplifier is : |
| A. | 200 and 1000 |
| B. | 15 and 200 |
| C. | 150 and 15000 |
| D. | 20 and 2000 |
| Answer» D. 20 and 2000 | |
| 17. |
A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F. because the method involves: |
| A. | cells |
| B. | potential gradients |
| C. | a condition of no current flow through the galvanometer |
| D. | a combination of cells, galvanometer and resistances |
| Answer» D. a combination of cells, galvanometer and resistances | |
| 18. |
A spherical black body with a radius of 12 cm radiates 450 watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watt would be : |
| A. | 225 |
| B. | 450 |
| C. | 1000 |
| D. | 1800 |
| Answer» E. | |
| 19. |
Consider a drop of rain water having mass 1 g falling from a height of 1 km. It hits the ground with a speed of 50 m/s. Take ‘g’ constant with a value 10 m/s2. The work done by the (i) gravitational force and the (ii) resistive force of air is : |
| A. | (i) – 10 J (ii) – 8.25 J |
| B. | (i) 1.25 J (ii) – 8.25 J |
| C. | (i) 100 J (ii) 8.75 J |
| D. | (i) 10 J (ii) – 8.75 J |
| Answer» E. | |
| 20. |
A gas mixture consists of 2 moles of O2 and 4 moles of Ar at temperature T. Neglecting all vibrational modes, the total internal energy of the system is : |
| A. | 4 RT |
| B. | 15 RT |
| C. | 9 RT |
| D. | 11 RT |
| Answer» E. | |
| 21. |
A spring of force constant k is cut into lengths of ratio 1 : 2 : 3. They are connected in series and the new force constant is k’. Then they are connected in parallel and force constant is k”. Then k’ : k” is : |
| A. | 1 : 6 |
| B. | 1 : 9 |
| C. | 1 : 11 |
| D. | 1 : 14 |
| Answer» D. 1 : 14 | |
| 22. |
A thin prism having refracting angle 10° is made of glass of refractive index 1.42. This prism is combined with another thin prism of glass of refractive index 1.7. This combination produces dispersion without deviation. The refracting angle of second prism should be : |
| A. | 4° |
| B. | 6° |
| C. | 8° |
| D. | 10° |
| Answer» C. 8° | |
| 23. |
The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is |
| A. | 2 |
| B. | 1 |
| C. | 4 |
| D. | 0.4 |
| Answer» E. | |
| 24. |
Two astronauts are floating in gravitational free space after having lost contact with their spaceship. The two will : |
| A. | keep floating at the same distance between them |
| B. | move towards each other |
| C. | move away from each other |
| D. | will become stationary |
| Answer» B. move towards each other | |
| 25. |
A 250 – Turn rectangular coil of length 2.1 cm and width 1.25 cm carries a current of 85 μA are subjected to a magnetic field of strength 0.85T. Work done for rotating the coil by 180º against the torque is : |
| A. | 9.1 μJ |
| B. | 4.55 μJ |
| C. | 2.3 μJ |
| D. | 1.15 μJ |
| Answer» B. 4.55 μJ | |
| 26. |
Two cars moving in opposite directions approach each other with speed of 22 m/s and 16.5 m/s respectively. The driver of the first car blows a horn having a frequency 400 Hz. The frequency heard by the driver of the second car is [velocity of sound 340 m/s] : |
| A. | 350 Hz |
| B. | 361 Hz |
| C. | 411 Hz |
| D. | 448 Hz |
| Answer» E. | |
| 27. |
The two nearest harmonics of a tube closed at one end and open at other end are 220 Hz and 260 Hz. What is the fundamental frequency of the system? |
| A. | 10 Hz |
| B. | 20 Hz |
| C. | 30 Hz |
| D. | 40 Hz |
| Answer» C. 30 Hz | |
| 28. |
Attractants and rewards are required for : |
| A. | Anemophily |
| B. | Entomophily |
| C. | Hydrophily |
| D. | Cleistogamy |
| Answer» C. Hydrophily | |
| 29. |
Which of the following options best represents the enzyme composition of pancreatic juice ? |
| A. | Which of the following options best represents the enzyme composition of pancreatic juice ? |
| B. | amylase, pepsin, trypsinogen, maltase |
| C. | peptidase, amylase, pepsin, rennin |
| D. | lipase, amylase, trypsinogen, procarboxypeptidase |
| Answer» E. | |
| 30. |
Which of the following options gives the correct sequence of events during mitosis ? |
| A. | condensation → nuclear membrane disassembly → crossing over → segregation → telophase |
| B. | condensation → nuclear membrane disassembly → arrangement at equator → centromere division → segregation → telophase |
| C. | condensation → crossing over → nuclear membrane disassembly → segregation → telophase |
| D. | condensation → arrangement at equator → centrometer division → segregation → telophase |
| Answer» C. condensation → crossing over → nuclear membrane disassembly → segregation → telophase | |
| 31. |
The vascular cambium normally gives rise to : |
| A. | Phelloderm |
| B. | Primary phloem |
| C. | Secondary xylem |
| D. | Periderm |
| Answer» D. Periderm | |
| 32. |
In case of a couple where the male is having a very low sperm count, which technique will be suitable for fertilisation ? |
| A. | Intrauterine transfer |
| B. | Gamete intracytoplasmic fallopian transfer |
| C. | Artificial Insemination |
| D. | Intracytoplasmic sperm injection |
| Answer» D. Intracytoplasmic sperm injection | |
| 33. |
Which of the following is made up of dead cells ? |
| A. | Xylem parenchyma |
| B. | Collenchyma |
| C. | Phellen |
| D. | Phloem |
| Answer» D. Phloem | |
| 34. |
The morphological nature of the edible part of coconut is |
| A. | Perisperm |
| B. | Cotyledon |
| C. | Endosperm |
| D. | Pericarp |
| Answer» D. Pericarp | |
| 35. |
Which of the following is correctly matched for the product produced by them ? |
| A. | Acetobacter aceti : Antibiotics |
| B. | Methanobacterium : Lactic acid |
| C. | Penicillium notatum : Acetic acid |
| D. | Sacchromyces cerevisiae : Ethanol |
| Answer» E. | |
| 36. |
The pivot joint between atlas and axis is a type of : |
| A. | fibrous joint |
| B. | cartilaginous joint |
| C. | synovial joint |
| D. | saddle joint |
| Answer» D. saddle joint | |
| 37. |
Mycorrhizae are the example of : |
| A. | Fungistasis |
| B. | Amensalism |
| C. | Antibiosis |
| D. | Mutualism |
| Answer» E. | |
| 38. |
Which statement is wrong for Krebs’ cycle ? |
| A. | There are three points in the cycle where NAD+ is reduced to NADH + H+ |
| B. | There is one point in the cycle where FAD+ is reduced to FADH2 |
| C. | During conversion of succinyl CoA to succinic acid, a molecule of GTP is synthesised |
| D. | The cycle starts with condensation of acetyl group (acetyl CoA) with pyruvic acid to yield citric acid |
| Answer» E. | |
| 39. |
The DNA fragments separated on an agarose gel can be visualised after staining with : |
| A. | Bromophenol blue |
| B. | Acetocarmine |
| C. | Aniline blue |
| D. | Ethidium bromide |
| Answer» E. | |
| 40. |
Which of the following facilitates opening of stomatal aperture ? |
| A. | Contraction of outer wall of guard cells |
| B. | Decrease in turgidity of guard cells |
| C. | Radial orientation of cellulose microfibrils in the cell wall of guard cells |
| D. | Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells |
| Answer» D. Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells | |
| 41. |
A dioecious flowering plant prevents both : |
| A. | Autogamy and xenogamy |
| B. | Autogamy and geitonogamy |
| C. | Geitonogamy and xenogamy |
| D. | Cleistogamy and xenogamy |
| Answer» C. Geitonogamy and xenogamy | |
| 42. |
A decrease in blood pressure/volume will not cause the release of : |
| A. | Renin |
| B. | Atrial Natriuretic Factor |
| C. | Aldosterone |
| D. | ADH |
| Answer» C. Aldosterone | |
| 43. |
In case of poriferans, the spongocoel is lined with flagellated cells called : |
| A. | ostia |
| B. | oscula |
| C. | choanocytes |
| D. | mesenchymal cells |
| Answer» D. mesenchymal cells | |
| 44. |
The region of Biosphere Reserve which is legally protected and where no human activity is allowed is known as : |
| A. | Core zone |
| B. | Buffer zone |
| C. | Transition zone |
| D. | Restoration zone |
| Answer» B. Buffer zone | |
| 45. |
Fruit and leaf drop at early stages can be prevented by the application of : |
| A. | Cytokinins |
| B. | Ethylene |
| C. | Auxins |
| D. | Gibberellic acid |
| Answer» D. Gibberellic acid | |
| 46. |
With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct ? |
| A. | Light saturation for CO2 fixation occurs at 10% of full sunlight |
| B. | increasing atmospheric CO2 concentration up to 0.05% can enhance CO2 fixation rate |
| C. | C3 plants respond to higher temperatures with enhanced photosynthesis while C4 plants have much lower temperature optimum |
| D. | Tomato is a greenhouse crop which can be grown in CO2 enriched atmosphere for higher yield. |
| Answer» D. Tomato is a greenhouse crop which can be grown in CO2 enriched atmosphere for higher yield. | |
| 47. |
A disease caused by an autosomal primary non-disjunction is : |
| A. | Down’s Syndrome |
| B. | Klinefelter’s Syndrome |
| C. | Turner’s Syndrome |
| D. | Sickle Cell Anemia |
| Answer» B. Klinefelter’s Syndrome | |
| 48. |
Which of the following are not polymeric ? |
| A. | Nucleic acid |
| B. | Proteins |
| C. | Polysaccharides |
| D. | Lipids |
| Answer» E. | |
| 49. |
Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct |
| A. | Both are due to a qualitative defect in globin chain synthesis. |
| B. | Both are due to a quantitative defect in globin chain synthesis. |
| C. | Thalassemia is due to less synthesis of globin molecules. |
| D. | Sickle cell anemia is due to a quantitative problem of globin molecules. |
| Answer» D. Sickle cell anemia is due to a quantitative problem of globin molecules. | |
| 50. |
Which one of the following is related to Ex-situ conservation of threatened animals and plants? |
| A. | Wildlife Safari parks |
| B. | Biodiversity hot spots |
| C. | Amazon rainforest |
| D. | Himalayan region |
| Answer» B. Biodiversity hot spots | |