Which of the following types of photons has the highest energy?
1 Visible radiations
2 Radio waves
3 Gamma rays
4 X-rays
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According to Dalton’s atomic theory, the smallest particle which can exist independently is 1 An atom 2 A molecule 3 A cation 4 An anion
Which of the following is commonly called a ‘polyamide’? 1 Rayon 2 Orlon 3 Terylene 4 Nylon
Which of the following re synthetic rubbers? 1.Thiokol 2.Isoprene 3.Neoprene 1 1 and 2 2 2 and 3 3 1 and 3 4 1,2 and 3
Write about recreational function of Science
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The element found on the surface of the moon is 1 Tin 2 Tungsten 3 Tantalum 4 Titanium
WHAT IS THE FUNCTION OF NIKEL IN CHEMICAL REACTION
What are soaps? 1 Salts of silicates 2 Esters of heavy fatty acids 3 Sodium or potassium salts of heavier fatty acids 4 Mixture of glycerol and alcohols
The metallic constituents of hard water are 1 Magnesium, calcium and tin 2 Iron, tin and calcium 3 Calcium, ,magnesium and iron 4 None of these
Which is the most famous comet?
Emerald is ----in colour 1 Violet 2 Yellow 3 Deep green 4 Prussian blue
Name the scientist who has been invited by the Srilankan Governement to have a Study on Employment development?
How many astronauts travelled in the challenger?