Top 100 Science Quiz Questions and Answers

1. A bullet hits and gets embedded in a solid block resting on a horizontal frictionless table. What is conserved’? – Momentum
2. Which mixture is homogeneous? – Methanol and water
3. What is formed by strong heating of potassium petmanganate? – O2
4. Most of the digestion occur in which part of alimentory canal of man? – Small intestine
5. What is the Branch of biology in which we study about relationship between living and their environment? – Ecology
6. Why does a man inside an artificial satellite feels weightlessness? – Because the force of attraction due to earth is zero at that earth is
7. Which has the longest wave length? – Infra red radiation
8. Which plant produce seed but not fruit? – Mint
9. When are positive ions are formed from neutral atoms? – By loss of electrons
10. Which Bacteria convert atmospheric nitrogen into nitrogenous compound? – Nitrogen fixing bacteria
11. If the ratio of the amplitudes of two waves is 4 : 3, then what will be the ratio of maximum and minimum intensity? – 49 : 1
12. When the universal gas constant (R) is divided by Avogadro’s number (N), what is their ratio called? – Boltzmann’s constant
13. Why is yeast is used in bakery in the preparation of bread? – Because it make bread soft and spongy
14. Which variety of glass is used for the manufacture of optical glasses? – Flint glass
15. Sex determination of child is done by whose chromosome? – Father
16. In a stationary longitudinal wave, nodes are points of which variation? – Maximum pressure variation
17. Which crop enrich the soil with nitrogen? – Pea
18. At constant temperature, the product of pressure and volume of a given amount of a gas is constant, whose this law? – Boyles’law
19. If the amplitude of sound is doubled and the frequency reduced to one-fourth, what will the intensity? – Decrease by a factor of 4
20. What is good source of protein ? – Soyabean
21. The compressed gas available in cooking gas cylinder is a mixture of which gases? – C4H10 + C3H8
22. What is the temperature at which the speed of sound in air becomes double of its value at 27°C? – 927°C
23. For television broadcasting. how much MHz frequency employed normally? – 30-300 MHz
24. Which insect spreads kala-azar? – Sand fly
25. By which enzyme is Urea converted into ammonia and carbon dioxide? – Urease
26. In the leaf of tobacco what is found? – Nicotin
27. Which property occurs in alkali metals? – Largest atomic radil
28. A number of images of a candle flame are seen in thick mirror which image will be brightest? – The second image is the brightest
29. Parthanogenesis is seen generally in which fruit? – Grapes
30. Inert gases (Except Helium) comes in which block in the periodic table? – p-block
31. Whose experiments proved that the speed of light was always the same? – Michelson and Marley
32. Why do Blood cells do not shrink in blood? – Because blood is isotonic
33. Which stem is modified to perform the function of leaf and many internodes called? – Phylloclade
34. What is the process of slow and homogeneous cooling of glass called? – Annealing of glass
35. Which is largest cell organelles? – Plastid
36. An endoscope is employed to view the internal parts of the body organ. It is based on the principle of which reflection? – Internal reflection
37. A solution contains 1 mole alcohol and 4 mole water. What will mole fraction of water and alcohal be? – 4/5 and 1/5
38. What is the process in which loss of water occurs in the form of water vapour through aerial part of plant? – Transpiration
39. A strong magnetic field is applied on a stationary electron, then how will the electron? – Remains stationary
40. Why does Pure water not conduct electricity? – Because it is almost not ionised
41. Besides water and light which is more essential as a raw material for photosynthesis? – CO2
42. Why is the conduction of electricity through the electrolyte solution? – Due to movement of ions of electrolyte
43. Which fraction is obtained between temperature 150–300°C during fractional distillation of crude petroleum? – Kerosene
44. What is the process of transfer of genetic information from DNA to RNA or formation of RNA from DNA? – Transcription
45. What is the Study of integrated use of microbiology, biochmistry and engineering? – Biotechnology
46. If a proton is brought towards an electron from infinity, how will the potential energy of the system? – Decrease
47. What is an example of emulsion? – Milk
48. Which system is formed by the interaction of a community of organisms with its environment? – Ecosystem
49. Which branch of science deals with the study of tissue found in the body of organism? – Histology
50. In the electrolysis the amount of mass deposited or liberated at an electrode is directly proportional to which thing? – Amount of charge
51. Activated charcoal is employed to remove colouring matter from pure substance, it work? – Adsorption
52. Which substance is more than 80% in the cell? – Water
53. A horizontal cable carries a current from west to east. the direction of the magnetic field produced by the current at a point vertically above the wire is which side? – North to south
54. What is the Eosin used to detect the end point of precipitation titration by adsorption called? – Normal indicator
55. Which branch of science that deals with the study of law is genetics for the improvement of human race? – Eugenics
56. What is the bond between two amino acids in a protein? – Ester bond
57. What is the Study of inter-relationships between an entire community and its environment? – Synecology
58. Ophthalmology is the branch of science in which we study about which thing? – Eye
59. The process of converting hydrate Al2O3 into anhydrous aluminium is known as which name? – Calcination
60. Fluorescent tubes are fitted with a choke. What does the choke coil? – Reduces current in the circuit
61. What is the second most common element in the universe? – Si
62. Entamoeba histolytica is found in which part of man? – Intestine
63. What is the maximum number of different electrical combination possible with three equal resistances? – 4
64. Which is the compound in that oxygen shows + 2 oxidation state? – F2O
65. The statements “Protoplasm is the physical basis of life” is given by which person? – Purkinje
66. Purification of aluminium by electrolyte refining is known as which name? – Hoope’s process
67. Malaria parasite and Amoeba are grouped under? – Protozoa
68. Magnetic dipole moment is a vector quantity directed from which direction? – South to north
69. What is France’s global ranking in terms of the number of animal species under threat? – 8
70. Which is the largest phylum in the animal kingdom in respect of number of species? – Arthropoda
71. A large magnet is broken into two pieces. If the lengths of two pieces are in the ratio of 3 : 4. what is the ratio of their pole strengths? – 1 : 1
72. Van arkel method of purification of metals involves converting the metal to which compound? – Volatile compound
73. By whom was Tetrahedral nature of bonding in carbon atom first shown? – van’t Hoff and Le-Bel
74. Which ancestor of man for the first time began the bipedal locomotion ? – Australopithecus
75. Which is the contractile protein muscle? – Myosin
76. Which is the compound in that oxygen shows –1 oxidation state is? – Na2O2
77. What is the reason of floating of the ore particles in concentration by froth floatation process? – Their being hydrophobic
78. What is also known as green protozo? – Euglena
79. If the electric current in a lamp decreases by 5% then the power output decreases by how many percentages? – 10%
80. Acid rain is caused due to emission of which gases into the atmosphere? – Oxides of nitrogen and sulphur
81. Which naturally occurring element in the rice husk makes it termite resistant? – Silicon
82. Which quantity remains constant in a step-down transformer? – Power
83. In the extraction of zinc the formation of blue flame is due to the burning of which gas? – CO
84. What number of essential amino acid is found in man? – 20
85. Which of the following potassium compounds is known as ‘Pearl ash’? – K2CO3
86. By which is the amount of light entering into the eye controlled? – Iris
87. Over the last 100 years global sea level has risen by about howmany cm? – 10-12. 5 cm
88. Whose statement is this? “Algebraic sum of the current meeting at a node is zero”– – Kirchhoff’s law
89. What is formed when white phosphorus is heated at 540 K in the absence of air? – Red phosphorus
90. Which tissue help in keeping the body warm? – Fatty tissue
91. A particle of mass m and charge q travels from rest through a potential difference V. What is its final energy? – qV
92. Why are elements of group I known as alkali metals? – Their oxides are alkaline
93. In which organ carbohydrate is stored as glycogen? – Liver
94. Which particle has the longest de Broglie wavelength if they are moving with same velocity ? – â-particle
95. Which pollutant is main product of automobile exhaust? – NO
96. If all plant of the world die than why will all animal ultimately die? – Due to Lack of oxygen
97. Why does Coagulation of blood not occur inside human body? – Due to presence of Heparin
98. Which oxide is amphoteric in nature? – SnO2
99. In methane molecule how are the four hydrogen atoms arranged? – As tetrahedral
100. What is an association of individuals of different species living in the same habitat and having functional interactions? – Biotic community


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