231. A solder is an alloy of:

1. 1. Tin and lead

   
   
   

   2. Lead and zinc

   
   
   

   3. Zinc and copper

   
   
   

   4. Copper and aluminium

   
   
   

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   A solder is an alloy of tin and lead.

   Correct Option: A

   A solder is an alloy of tin and lead.

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232. Amorphous materials:

1. 1. Glass

   
   
   

   2. Silver

   
   
   

   3. Lead

   
   
   

   4. Zinc

   
   
   

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   NA

   Correct Option: A

   NA

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233. Which bond gives the softest bond?

1. 1. Silicate bond

   
   
   

   2. Shellac bond

   
   
   

   3. Vitrified bond

   
   
   

   4. All of equal strength

   
   
   

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   NA

   Correct Option: A

   NA

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234. Silica gel is used for ……… of air.

1. 1. purification

   
   
   

   2. deionization

   
   
   

   3. humidification

   
   
   

   4. dehumidification

   
   
   

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   NA

   Correct Option: D

   NA

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235. Electrical resistances are made from:

1. 1. Elinvar

   
   
   

   2. Duralumin

   
   
   

   3. Constantan

   
   
   

   4. Monel metal

   
   
   

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1. View Hint View Answer Discuss in Forum

   Electrical risistances are made from constantan.

   Correct Option: C

   Electrical risistances are made from constantan.

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