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831. Glass is made of the mixture of :

A. quartz and mica

B. sand and salt

C. sand and silicates

D. none of these

Explanation:

832. The dress made out of which of the following meterials is safe to wear while cooking ?

A. Cotton

B. Silk

C. Nylon

D. Terylene

Explanation:

833. Which of the following is the correct combination of the inventors and the inventions ?

A. Galileo Galilei - Transistors

B. Elisha Thomsan - Windmill

C. J. L. Baird - Television

D. Sir Frank Whittle - Laser

Explanation:

834. Who among the following does not have a chemical elements named after him ?

A. Albert Einstein

B. Enrico Fermi

C. Isaac Newton

D. Mendeleef

Explanation:

835. Which of the following are the ingredients of gun metal ?

A. Iron, Tin

B. Copper, Tin

C. Iron, Brass, Tin

D. Iron, Zinc, Titanium

Explanation:

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