MPSC Science & Technology — Previous Year Questions

Maharashtra Public Service Commission has asked 111 questions on Science & Technology across 6 papers (2021–2026). Every one is solved below — open a question for the answer, why it is right, and why each wrong option was written to tempt you.

1. 2026Q52The net electric charge that passes through the surface per unit time is called ________.Answer: A
2. 2026Q53Match the quantities in Column - I with their dimensions in the Column - II. Column - I (a) Permeability (μ₀) (b) Coefficient of Viscosity (η) (c) Planck's Constant (h) Column - II (i) ML²T⁻¹ (ii) MLT⁻²I⁻² (iii) ML⁻¹T⁻¹ (Where M is mass, L is length, T is time and I is the current).Answer: C
3. 2026Q54If the refractive index of the medium is more than the refractive index of double concave or double convex lens, then the focal length of the lens becomes ________.Answer: D
4. 2026Q55According to Second Law of the thermodynamics how much will be the efficiency of heat engine ?Answer: D
5. 2026Q56How does the nuclear force behave, when the spin of nucleons are parallel ?Answer: A
6. 2026Q57Predict which of the following organisms will have the highest percentage of unsaturated phospholipids in their membranes ?Answer: A
7. 2026Q58Select the organelle that contains its own DNA and 70S ribosomes but is found in eukaryotic cells.Answer: B
8. 2026Q59Apomixis is a type of reproduction that results in the development of a/an :Answer: A
9. 2026Q60Identify the correct statements about jumping genes. (a) These are genes that can change their positions. (b) These are also called transposons. (c) These were firstly discovered by Barbara McClintock in 1965.Answer: D
10. 2026Q61Evolution of marsupials and placental mammals is an example of ________.Answer: B
11. 2026Q62A polypeptide hormone Calcitonin (CT) is produced by parafollicular cells of _________ gland.Answer: C
12. 2026Q63During which stage of HIV infection do the symptoms of AIDS usually appear ?Answer: C
13. 2026Q64Which of the following is not a natural plant growth hormone ?Answer: C
14. 2026Q65A colloidal dispersion of one liquid in another immiscible with it is called _________.Answer: C
15. 2026Q66Identify the mineral acid/acids from following acids : (a) Oxalic acid (b) Sulphuric acid (c) Nitric acid (d) Hydrochloric acidAnswer: B
16. 2026Q67Chloroamphenicol is a _________. (a) Narrow spectrum antibiotic (b) Broad spectrum antibiotic (c) Limited spectrum antibiotic (d) Antiseptic drugAnswer: B
17. 2026Q68Which of the following elements has the highest electronegativity ?Answer: C
18. 2026Q69The oxidation states of all elements in any allotropic form is _________.Answer: C
19. 2025Q51The ratio of lengths to radii of two rods of same material is 1 : 2 and 2 : 3. If temperature difference between two ends of the rod is same, then what will be the ratio of heat flow ?Answer: D
20. 2025Q52In the network of resistances shown below, Current through the battery will be ___________.Answer: D
21. 2025Q53Which physical quantity conserved during collision ?Answer: B
22. 2025Q54Which of the following confirms that the universe is not static but expanding ?Answer: A
23. 2025Q55Neutrino particle is emitted in the process of ___________.Answer: B
24. 2025Q56What is the effect of increase in temperature on viscosity of gases ?Answer: A
25. 2025Q57Stomata will open if there is accumulation of the following element in the guard cells ___________.Answer: B
26. 2025Q58Citrus canker is caused by which type of pathogen ?Answer: A
27. 2025Q59Which of the following statements are correct regarding Spirogyra algae ? a. It is commonly called as Pond scum. b. It grows in Marine water. c. Its cell consist spiral shaped chloroplast. d. It belong in family Zygnemataceae.Answer: C
28. 2025Q60The categories of sclereids are ___________. a. Macrosclereids b. Osteosclereids c. Tracheids d. Asterosclereids Which of the statements given above is/are correct ?Answer: C
29. 2025Q61Which of the following sets of hormones regulate menstrual cycle ?Answer: A
30. 2025Q62Flowers, leaves and seeds of which plant are used to prepare a narcotics 'Marijuana' ?Answer: A
31. 2025Q63The main objective/s of "Human Genome Project 1990" was/were _______. a. To identify 20,000 to 25,000 genes in human. b. To determine the sequence of 5 billion base pairs in DNA. c. To incorporate new genomic knowledge into research and medicine. d. To develop cloning of animals.Answer: C
32. 2025Q64In prokaryotic genetic code, which is the initial code for N-formyl methionine ?Answer: D
33. 2025Q65Which of the following options does not involve use of carbon in any form for energy production ? A. Wood B. Biogas C. Geothermal source D. CoalAnswer: C
34. 2025Q66Which chemical bond is formed between Mg and Cl atoms during formation of compound MgCl2 ? a. Covalent bond b. Ionic bond c. Coordinate covalent bond d. Metallic bondAnswer: D
35. 2025Q67Which of the following is used as a substitute for wool in the production of commercial fibers ?Answer: C
36. 2025Q68Which of the following medicine can be classified as both Analgesics and Antipyretics ? A. Veronal B. Benadryl C. Penicillin D. ParacetamolAnswer: D
37. 2025Q69Match the correct pairs : A. Monosaccharide B. Disaccharide C. Trisaccharide D. Polysaccharide i. Raffinose ii. Starch iii. Glucose iv. SucroseAnswer: D
38. 2025Q70The isotopes of hydrogen and their respective mass ratio are _________.Answer: D
39. 2024Q51A particle thrown up has zero velocity but how much will be the acceleration ?Answer: C
40. 2024Q52Which one of the following is not an application of Bernoulli equation ?Answer: D
41. 2024Q53At room temperature (300k), what is the significant contribution wavelength for the thermal radiation emitted by a body ?Answer: B
42. 2024Q54Which of the following sentence is wrong ? (I) Atomic nucleus is made up of protons and neutrons. (II) Proton has a positive charge. (III) Electron has a negative charge. (IV) Neutron has a positive charge. Answer options :Answer: D
43. 2024Q55Say whether following sentences are true or false : (I) For propagation of sound medium is necessary. (II) Unit of frequency of sound is Hertz. (III) Loudness of sound is expressed in decibel unit. Answer options :Answer: A
44. 2024Q56Which of the following wavelengths are used to study the crystal structure of material ?Answer: C
45. 2024Q57Leaf Blight of wheat is caused by infection of which of the following fungus ?Answer: B
46. 2024Q58Which division of Plantae is called amphibians of plant kingdom ?Answer: A
47. 2024Q59With respect to structure of DNA, following four statements are made. Choose the two relevant statements. (a) DNA is made of two long chains of nucleotides coiled in a helix around a central axis. (b) DNA is made of two long chains of nucleoside coiled around a central axis. (c) The two chains are complimentary to each other so that Adenine is always paired with Thymine and cytosine with Guanine. (d) The two chains are not complimentary to each other where Adenine is paired with uracil and cytosine with Guanine. Answer options :Answer: C
48. 2024Q60Which of the following statements are correct about the cell theory of Schleiden and Schwann ? (a) All living things are composed of one or more cells. (b) New cells are formed from the pre-existing cells. (c) There are basic similarities in chemical composition and metabolic functions of cells. (d) The activity of an organism is collective activities and interactions of its cellular structures. Answer options :Answer: D
49. 2024Q61Which of the following animals belong to same class ?Answer: D
50. 2024Q62Which plants extract/latex is used to prepare a narcotics called Heroin ?Answer: A
51. 2024Q63Match the following to express general resemblance between bones and girdle fore limbs and hind limbs. List no. - 1 (a) Shoulder joint (b) Humerus (c) Elbow (d) Radio-ulna List no. - 2 (i) Tibio-fibula (ii) Knee (iii) Femur (iv) Hip joint Answer options :Answer: A
52. 2024Q64Which of the following statements is true ? (a) The adult human skeleton consists of 208 bones. (b) Vertebrae and facial bones are irregular type of bones. Answer options :Answer: B
53. 2024Q65Consider the following statements : Rate of a chemical reaction is ________. (a) proportional to the concentration of reactants. (b) decreases on increasing the concentration of reactants. (c) increases on increasing the temperature. (d) decreases on increasing the temperature. Which of the statement given above is/are correct ?Answer: C
54. 2024Q66Which chemical compound is used to neutralize the acidity of soil increased due to excessive use of Chemical Fertilizers ? (a) Potash (b) Lime water (c) Milk of magnesia (d) Ammonium hydroxide Answer options :Answer: C
55. 2024Q67Which of the following pair/pairs of metal/metals can be extracted from their ores by using cyanide complex solutions ? (A) Cu and Au (B) Co and Ag (C) Au and Ag (D) Na and Hg Answer options :Answer: B
56. 2024Q68Identify the type of following chemical reaction. 2KClO3(s) ---Δ---> 2KCl(s) + 3O2 ↑ (a) Exothermic reaction (b) Displacement reaction (c) Decomposition reaction (d) Photochemical reaction Answer options :Answer: A
57. 2024Q69From the following which isotope is called as heavy hydrogen ? (a) Protium (b) Deuterium (c) Tritium (d) None of the above Answer options :Answer: B
58. 2024Q70________ is used to estimate the presence of unsaturation in oils and fats.Answer: B
59. 2023Q36____________ are materials whose resistivities become zero below a critical temperature.Answer: C
60. 2023Q37If an object is placed symmetrically between two plane mirrors inclined at an angle of 36°, then how many images will be formed ?Answer: B
61. 2023Q39When α-particle emits from a radioactive element thenAnswer: A
62. 2023Q40The fever of a child is 104°F. What is this temperature in degree Celsius ?Answer: D
63. 2023Q41Which of the following statement is correct ?Answer: A
64. 2023Q42Match the following – Vitamins and respective deficiency diseases : Vitamins a. Vit. A b. Vit. D c. Vit. C d. Vit. B12 Deficiency disease i. Rickets ii. Scurvy iii. Anaemia iv. Night blindnessAnswer: B
65. 2023Q43Anguina tritici is the parasitic nematode found on ______ plant.Answer: A
66. 2023Q44Conchology is the study of what ?Answer: C
67. 2023Q45Phyllum Mollusca contains soft bodied animals characterized of : a. They are second largest phyllum in animal kingdom b. They are generally bilaterally symmetrical c. They are only Terrestrial animals d. They are having muscular foot Which of the statements given above is/are correct ?Answer: B
68. 2023Q61Which of the following mathematical relationships should be used to calculate the pH of a 0.10M aqueous HCl solution ?Answer: C
69. 2023Q62How is 1.0N H₂SO₄ solution is prepared from 10 dm³ of 1.5M H₂SO₄ solution ?Answer: C
70. 2023Q63Which of the following is correct for the shapes of NH₃ and BF₃ ?Answer: D
71. 2023Q64Which of the following hydrocarbon has 80% carbon ? (H = 1, C = 12)Answer: C
72. 2023Q65180 g of acetic acid (CH₃COOH) is mixed with 180 g of water (H₂O). The mole fraction of acetic acid in the resultant solution is [H = 1, C = 12, O = 16]Answer: A
73. 2023Q66If one mole of an ideal gas occupies 22.4 Lit at Standard Temperature and Pressure, then the value of the universal gas constant R isAnswer: A
74. 2023Q67Find the wrong pair.Answer: C
75. 2023Q68What is the principal function of the light-dependent reactions of photosynthesis ?Answer: C
76. 2023Q69_________ are precursors of enzymes. a. Zymogens b. Ribosomes c. RNA d. Protein Which of the option given above is/are correct ?Answer: A
77. 2023Q70Which of the following statement/s is/are correct ? a. Enzymes are organic catalyst that accelerate biochemical reaction. b. Enzymes are made up from proteins. c. Enzyme activity is not depends upon temperature. d. Amylase is an enzyme that act on starch.Answer: C
78. 2022Q36Which of the following methods is used for measurement of distance between Earth and planets ?Answer: A
79. 2022Q37When a potential difference of 33 V is applied to a device whose resistance is 110 Ω, some current flows through it. If the same current is to be passed through a device whose resistance is 500 Ω, then how much potential difference is to be applied ?Answer: D
80. 2022Q38Which one of the following is a natural magnet ?Answer: D
81. 2022Q39SONAR (Sound Navigational Ranging) technique is used for ________ .Answer: D
82. 2022Q40Calculate the distance travelled by a sound wave having frequency 1000 Hz and wavelength 0·25 m, if it travels for 5 seconds in a certain medium.Answer: B
83. 2022Q41A cat is sitting in between two plane mirrors. If the angle between two plane mirrors is 30 degrees, how many images of the cat will appear ?Answer: C
84. 2022Q43What will be the eye colour of all female individuals in F1 generation when a white eyed female Drosophila is crossed with a red eyed male Drosophila ?Answer: B
85. 2022Q44Viroids are identified on the basis of which of the following three characteristic features ? (a) Much smaller in size than viruses (b) Consist of circular RNA molecule (c) RNA molecule covered by protein coat (d) Infect the plant cellsAnswer: A
86. 2022Q45Which of the following substances are components of soil ? (a) Stones and sand (b) Fine soil and decomposed matter (c) Chemical substances (d) Colour substances (Dyes)Answer: C
87. 2022Q46Which steps of taxons are followed for classification of animals ?Answer: D
88. 2022Q48Pituitary gland is endocrine gland connected to hypothalamus at the base of the brain. It secretes many hormones. (a) It is called as master endocrine gland. (b) Its anterior part is neurohypophysis and posterior is adenohypophysis. (c) Oxytocin and Vasopressin are secreted by posterior pituitary. (d) STH, TSH, ACTH are secreted by adenohypophysis. Which of the statements given above is/are correct ?Answer: B
89. 2022Q49During Krebs cycle in respiration, fumaric acid gets converted into malic acid by ________ .Answer: B
90. 2022Q50In a diamond, each carbon atom is ________ surrounded by other carbon atoms.Answer: B
91. 2022Q51An atomic number of Tritium is ________ .Answer: D
92. 2022Q53The electrostatic repulsion between electron pairs such as lone pair – lone pair (l.p. – l.p.), bond pair – bond pair (b.p. – b.p.) and lone pair – bond pair (l.p. – b.p.) in a given valence shell decreases in the order of ________ .Answer: B
93. 2022Q54The maximum number of molecules are present in ________ . [H = 1, C = 12, O = 16, I = 127]Answer: D
94. 2022Q55The oxidation state of V in V2O7-4 is ________ .Answer: A
95. 2021Q51Consider the following statements : (a) An atom is electrically neutral. (b) The negative charge on nucleus is equal to the total negative charge of all the orbiting electrons.Answer: C
96. 2021Q52If density of water is 1000 kgm⁻³ and density of copper is 8.9 × 10³ kgm⁻³. What is relative density of copper ?Answer: A
97. 2021Q53Find the refractive index of the second medium with respect to the first medium, if light moves through the first medium with velocity 2 × 10⁸ ms⁻¹, which changes to 1.25 × 10⁸ ms⁻¹ in the second medium.Answer: C
98. 2021Q55A person carrying a bag of total mass 25 kg climbs upto a height 5 meters in 30 seconds. How much power the man needs to carry the bag ?Answer: B
99. 2021Q56A laser light beamed at the Moon takes 2.56 s to return to earth after reflection at the Moon's surface. How much is the radius of the lunar orbit around the Earth ?Answer: D
100. 2021Q57Which of the following cell organelle is not bounded by membrane ?Answer: B
101. 2021Q59With respect to chromosomes in eukaryotic cells regarding DNA as genetic material consider the following statements. (a) Histones are small proteins associated with chromosomal DNA of eukaryotic cells. (b) These proteins are rich in basic Amino Acids Argenine and Lysine. (c) These protein lack Trptophan.Answer: B
102. 2021Q60Which among the following is not involved in Respiratory Process ?Answer: A
103. 2021Q62Which gastric juices are secreted in human stomach ?Answer: C
104. 2021Q63Give the sequence of blood circulation in mammalian heart. (a) Left auricle (b) Right auricle (c) Left ventricle (d) Right ventricleAnswer: C
105. 2021Q64Which one of the following is not an intermediate step in Respiration ?Answer: B
106. 2021Q65In CaO, so as to achieve the stable octate :Answer: A
107. 2021Q6632 g of methane (molar mass 16 g/mol) is mixed with 192 g of oxygen (molar mass 32 g/mol). Presuming that these gases donot react with each other, what is the mole fraction of methane ?Answer: A
108. 2021Q67Which of the following statements are correct ? (a) Diamond is a non-conductor of electricity. (b) Graphite has a two dimensional sheet like structure. (c) Graphite conducts electricity. (d) Diamond is used for rock drilling.Answer: A
109. 2021Q68Which has maximum Ionization Energy ?Answer: C
110. 2021Q69Chemical reaction rates generally _________.Answer: C
111. 2021Q70The mildest reducing agent which reduces only carbonyl group in presence of nitro, carboxyl, double bond and ester group is _________.Answer: C