Ozone attacks 1 Mercury and silver 2 Copper 3 Silver and iron 4 None of these

2 Answers  

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Which of the following substances undergoes chemical change on heating? 1 Sodium chloride 2 Silica 3 Lead nitrate 4 Platinum wire

2 Answers  

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Why is food necessary for human body ?

2 Answers  

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atoms are composed of Electrons & Protons or Electrons & Protons ?

3 Answers  

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How can we calculate %difference in Weighing balance?

0 Answers   Meghmani Organics,

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Which was the international geo - physical year?

0 Answers  

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Which of the following is commonly called a ‘polyamide’? 1 Rayon 2 Orlon 3 Terylene 4 Nylon

1 Answers  

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Write two characteristics of Science.

0 Answers   Mahatma Gandhi University,

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Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of 1 Nitrates 2 Zeolites 3 Sulphontes 4 None of these

2 Answers  

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Which of the following fertilizers leaves acidic residue? 1 Urea 2 Ammonium phosphate 3 Ammonium sulphate 4 None of these

1 Answers  

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In laundry soaps, a material called ‘filler’ is used. Which of the following is a ‘filler? 1 Talc 2 Sodium silicate 3 Soda ash 4 Sodium phosphate

1 Answers  

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Which of the following was to be discovered first in the chromo sphere of the sun? 1 Xenon 2 Helium 3 Neon 4 Krypton

1 Answers  

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