name all the density all cloth,metals,materials?
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Ozone attacks 1 Mercury and silver 2 Copper 3 Silver and iron 4 None of these
Rayon is chemically 1 Glucose 2 Amylase 3 Cellulose 4 Pectin
List and explain two instances of Correlation Science with Life Situation
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Emerald is ----in colour 1 Violet 2 Yellow 3 Deep green 4 Prussian blue
Which of the following is used as a moderation in nuclear reactor? 1 Ordinary water 2 Radium 3 Thorium 4 Graphite
Explain the role of Science for sustainable Development
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why is it important that sex cells have half the number of Chromosomes as body cells?
Reaction of alcohol, with a carboxylic acid is known as 1 Substitution Reaction 2 Addition reaction 3 Esterification 4 Hydrogenation
Which is the largest refractor telescope?
Why is ice wrapped in gunny sacks to prevent it from melting
The chemical used as a ‘fixer’ in photography is 1 Borax 2 Sodium thiosulphate 3 Sodium sulphate 4 Ammonium persulphate
Which of the following is the lightest gas? 1 Nitrogen 2 Hydrogen 3 Ammonia 4 Carbon dioxide