CTET Solved Paper - RTET Feburary 2011 Paper2
142. Detergent is a complex salt of
- Option : A
- Explanation : Detergent is made by using sodium salt.
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143. Device used to send text and pictures is
- Option : C
- Explanation : FAX is an electronic tele communication system that transmits scanned documents from one terminal device to other.
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144. Which of the following mixtures of gases are used for welding of metals?
- Option : D
- Explanation : Oxygen and acetylene is used for welding of metals.
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145. Symbol of Tungsten element is
- Option : A
- Explanation : Tungsten is also known as wolfram is chemical element with symbol W.
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