61. Which gas is used for artificial ripening of green fruit ?
A. Carbon dioxide
B. Acetylene
C. Ethane
D. Ethylene

62. Sunsets on Mars are _________?
A. Red
B. Blue
C. Yellow
D. Orange

63. BCG vaccine is used to produce immunity against___________?
A. Whooping cough
B. Tuberculosis
C. Virus fever
D. Smallpox

64. The Tree sends down roots from its branches to the soil is known as:___________?
A. Oak
B. Pine
C. Banyan
D. Palm

65. Which of the following is used as a lubricant?
A. Graphite
B. Silica
C. Diamond
D. Iron oxide

66. The element common to all acids is:__________?
A. Hydrogen
B. Carbon
C. Sulphur
D. Oxygen

67. Carbon, Diamond and Graphite are together called:___________?
A. Allotrope
B. Isomers
C. Isomorphs
D. Isotopes

68. Most soluble in water is:__________?
A. Camphor
B. Sulphur
C. Common salt
D. Sugar

69. Radiations are harmful as it:___________?
A. Causes skin cancer
B. Causes anemia
C. Alters body tissue
D. is unstable

70. An active asteroid is discovered near ________ Orbit for the first time in billion years.
A. Saturn
B. Mars
C. Neptune
D. Jupiter