41. The polymer benzene is obtained from ______.
(A) ethane
(B) ethyne
(C) methane
(D) ethene

42. A substance which reacts with gangue to form fusible material is called _______.
(A) ore
(B) slag
(C) catalyst
(D) flux

43. Sound waves are characterised by the motion of particles in the medium and thus is referred to as _________.
(A) Optical waves
(B) Electromagnetic waves
(C) Mechanical waves
(D) Matter waves

44. When was Soil and Land use survey of India established?
(A) 1958
(B) 1972
(C) 1976
(D) 1956

45. What is Sonalika crop developed during green revolution?
(A) Semi-dwarf wheat
(B) Semi-dwarf okra
(C) Dwarf maize
(D) Dwarf millets

46. What is the chemical formula of diamond?
(A) COOH
(B) C
(C) CHO
(D) OH

47. What is the density of water at 277K?
(A) 4000 Kg / m³
(B) 500 Kg / m³
(C) 1 Kg / m³
(D) 1000 Kg / m³

48. The process of planting trees in a non-agricultural land is called ______.
(A) Deforestation
(B) Afforestation
(C) Desertification
(D) Reforestation

49. Which of the following is a crystalline form of carbon?
(A) Coke
(B) Graphite
(C) Charcoal
(D) Lamp black

50. Which among the following examples represents the periodic motion?
(A) Swaying of the branches of a tree
(B) A hydrogen molecule rotating about its centre of mass
(C) An arrow released from a bow
(D) A swimmer completing one trip from one bank of a river to the other and back

51. Which ions in water make the enamel on teeth much harder?
(A) Lead
(B) Nitrate
(C) Suphate
(D) Fluoride

52. Which of the following geothermal fields is located in Ladakh?
(A) Manikaran
(B) Tattapani
(C) Puga Valley
(D) Surajkund

53. How do dams effect local marine lives?
(A) Fishing occurs to greater extent
(B) No new organism enter the dam area
(C) Local Aquatic biome is destroyed
(D) Low temperature causes disruption

54. In a sound wave, what is the peak representing the maximum compression region called?
(A) Crest
(B) Frequency
(C) Trough
(D) Wavelength

55. Which of the following was signed at the Earth Summit in Rio de Janeiro in 1992?
(A) Vienna Convention
(B) Convention on Biological Diversity
(C) Montreal protocol
(D) Kigali agreement

56. Which of the following is not employed for refining of metals?
(A) Liquation
(B) Electrolysis
(C) Poling
(D) Leaching

57. Where is the force of gravity maximum on the earth’s surface?
(A) At the poles
(B) At the equator
(C) At the tropical region
(D) Constant everywhere

58. What is defined as the limit of the average acceleration as the time interval goes to zero?
(A) Instantaneous velocity
(B) Instantaneous speed
(C) Instantaneous acceleration
(D) Uniform acceleration

59. The reaction between an alcohol and a carboxylic acid leads to the formation of_______.
(A) Aldehyde
(B) Ketone
(C) Amine
(D) Ester

60. What is the causative organism of Grasserie disease in silkworms?
(A) Bacteria
(B) Virus
(C) Protozoans
(D) Fungi