Home ≫ General Knowledge ≫ General Science ≫ Page 7
61. The outermost layer of earth is called ____________, the central part is called _____________ and the innermost part is called _________________.
  A.  Crust, Mantle, Core
  B.  Mantle, Crust, Core
  C.  Crust, Core, Mantle
  D.  Crust, Mantle, Centre
     
   
View Answer

62. The astronomers estimated the time of birth of our universe is about ____________ ago.
  A.  12 billion years
  B.  15 billion years
  C.  18 billion years
  D.  10 billion years
     
   
View Answer

63. The outer crust of earth is called __________________.
  A.  Troposphere
  B.  Lithosphere
  C.  Atmosphere
  D.  Stratosphere
     
   
View Answer

64. The heating up of the earth's atmosphere due to the trapping of infra-red rays by carbon dioxide is called _____________________.
  A.  Green-house effect
  B.  Heating effect
  C.  Heat-traping effect
  D.  None of these
     
   
View Answer

65. Which of the following is the best conductor of heat?
  A.  Copper
  B.  Silver
  C.  Aluminum
  D.  Iron
     
   
View Answer

66. Which metals have low melting, boiling point and low density ?
  A.  Sodium and Potassium
  B.  Sodium and Tungsten
  C.  Tungsten and Potassium
  D.  All of the above
     
   
View Answer

67. Which metal is a liquid metal?
  A.  Sodium
  B.  Potassium
  C.  Phosphorus
  D.  Mercury
     
   
View Answer

68. Which metals can be cut with knife?
  A.  Potassium
  B.  Sodium
  C.  Both A & B
  D.  None of the above
     
   
View Answer

69. Which metal is the poorest conductor of heat?
  A.  Mercury
  B.  Lead
  C.  Tin
  D.  Bismuth
     
   
View Answer

70. Name two metals which occur in nature in free state.
  A.  Gold and Platinum
  B.  Lithium and Sodium
  C.  Potassium and Rubidium
  D.  Caesium and Francium
     
   
View Answer

Copyright © 2020-2022. All rights reserved. Designed, Developed and content provided by Anjula Graphics & Web Desigining .