Important Science Question and Answer for All Competive Examination

1. What is the process in which loss of water occurs in the form of water vapour through aerial part of plant? – Transpiration
2. A strong magnetic field is applied on a stationary electron, then how will the electron? – Remains stationary 
3. Why does Pure water not conduct electricity? – Because it is almost not ionised 
4. Besides water and light which is more essential as a raw material for photosynthesis? – CO2 
5. Why is the conduction of electricity through the electrolyte solution? – Due to movement of ions of electrolyte 
6. Which fraction is obtained between temperature 150–300°C during fractional distillation of crude petroleum? – Kerosene 
7. What is the process of transfer of genetic information from DNA to RNA or formation of RNA from DNA? – Transcription 
8. What is the Study of integrated use of microbiology, biochmistry and engineering? – Biotechnology 
9. If a proton is brought towards an electron from infinity, how will the potential energy of the system? – Decrease 
10. What is good source of protein ? – Soyabean 
11. The compressed gas available in cooking gas cylinder is a mixture of which gases? – C4H10 + C3H8 
12. What is the temperature at which the speed of sound in air becomes double of its value at 27°C? – 927°C 
13. For television broadcasting. how much MHz frequency employed normally? – 30-300 MHz 
14. Inert gases (Except Helium) comes in which block in the periodic table? – p-block 
15. Whose experiments proved that the speed of light was always the same? – Michelson and Marley 
16. What is an example of emulsion? – Milk 
17. Which system is formed by the interaction of a community of organisms with its environment? – Ecosystem 
18. Which branch of science deals with the study of tissue found in the body of organism? – Histology 
19. In the electrolysis the amount of mass deposited or liberated at an electrode is directly proportional to which thing? – Amount of charge 
20. Activated charcoal is employed to remove colouring matter from pure substance, it work? – Adsorption 
21. Which substance is more than 80% in the cell? – Water 
22. 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 
23. What is the Eosin used to detect the end point of precipitation titration by adsorption called? – Normal indicator 
24. Which is the compound in that oxygen shows + 2 oxidation state? – F2O
25. The statements “Protoplasm is the physical basis of life” is given by which person? – Purkinje 
26. Purification of aluminium by electrolyte refining is known as which name? – Hoope’s process 
27. Van arkel method of purification of metals involves converting the metal to which compound? – Volatile compound  
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. Entamoeba histolytica is found in which part of man? – Intestine 
31. What is the maximum number of different electrical combination possible with three equal resistances? – 4
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 inter nodes 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. Ophthalmology is the branch of science in which we study about which thing? – Eye 
39. The process of converting hydrate Al2O3 into anhydrous aluminium is known as which name? – Calcination 
40. Fluorescent tubes are fitted with a choke. What does the choke coil? – Reduces current in the circuit 
41. What is the second most common element in the universe? – Si Which insect spreads kala-azar? – Sand fly 
    
42. Malaria parasite and Amoeba are grouped under? – Protozoa
43. Magnetic dipole moment is a vector quantity directed from which direction? – South to north
44. What is France’s global ranking in terms of the number of animal species under threat? – 8
45. Which is the largest phylum in the animal kingdom in respect of number of species? – Arthropoda
46. 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
47. Which branch of science that deals with the study of law is genetics for the improvement of human race? – Eugenics
48. What is the bond between two amino acids in a protein? – Ester bond
49. What is the Study of inter-relationships between an entire community and its environment? – Synecology
50. By which enzyme is Urea converted into ammonia and carbon dioxide? – Urease