186. All of the following substances are hygroscopic EXCEPT:

1. 1. Silica gel

   
   
   

   2. Calcium chloride

   
   
   

   3. Sulphuric acid

   
   
   

   4. Sodium chloride

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

---

187. Which of the following contains silicon?

1. 1. Brass

   
   
   

   2. Solder

   
   
   

   3. Glass

   
   
   

   4. Polythene

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

---

---

188. Lead is widely used in:

1. 1. transformers

   
   
   

   2. switchgears

   
   
   

   3. galvanised pipes

   
   
   

   4. batteries

   
   
   

---

1. View Hint View Answer Discuss in Forum

   Lead is widely used in Batteries.

   Correct Option: D

   Lead is widely used in Batteries.

---

189. PVC stands for:

1. 1. Plastic very compact

   
   
   

   2. Polythene vinyl chloride

   
   
   

   3. Phosphorous vanadium compound

   
   
   

   4. Poly vinyl chloride

   
   
   

---

1. View Hint View Answer Discuss in Forum

   PVC stands for polyvinyl chloride.

   Correct Option: D

   PVC stands for polyvinyl chloride.

---

---

190. Which of the following is a copper free alloy?

1. 1. Brass

   
   
   

   2. Phosphor bronze

   
   
   

   3. Invar

   
   
   

   4. Muntz metal

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

---