86. Blue revolution relates to

1. 1. Crop farming

   
   
   

   2. Industrial production

   
   
   

   3. Fishing

   
   
   

   4. Mining and metallurgy.

   
   
   

---

1. View Hint View Answer Discuss in Forum

   Fishing

   Correct Option: C

   Fishing

---

87. Uranium is the __________among the known metals.

1. 1. lightest

   
   
   

   2. heaviest

   
   
   

   3. most porous

   
   
   

   4. most crystalline

   
   
   

---

1. View Hint View Answer Discuss in Forum

   heaviest

   Correct Option: B

   heaviest

---

---

88. The most abundant source of energy is

1. 1. Oil

   
   
   

   2. Biomass

   
   
   

   3. Coal

   
   
   

   4. Sun

   
   
   

---

1. View Hint View Answer Discuss in Forum

   Sun

   Correct Option: D

   Sun

---

89. Which mineral is considered to be the hardest ?

1. 1. Tungsten

   
   
   

   2. Diamond

   
   
   

   3. Platinum

   
   
   

   4. Uranium

   
   
   

---

1. View Hint View Answer Discuss in Forum

   Diamond

   Correct Option: B

   Diamond

---

---

90. What is white coal ?

1. 1. Petroleum

   
   
   

   2. Producing fuel from Thermal power

   
   
   

   3. Producing fuel from Chopped wood

   
   
   

   4. Producing fuel from Nuclear power

   
   
   

---

1. View Hint View Answer Discuss in Forum

   Producing fuel from Chopped wood

   Correct Option: C

   Producing fuel from Chopped wood

---