In vulcanization, natural rubber is heated with
1 Carbon
2 Sulphur
3 Silicon
4 Phosphorus
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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
Graphite and sillimanite are 1 Refractory minerals 2 Ferrous minerals 3 Base minerals 4 None of these
The element found on the surface of the moon is 1 Tin 2 Tungsten 3 Tantalum 4 Titanium
How can we calculate %difference in Weighing balance?
The age of most ancient geological formations is estimated by 1 Potassium-argon method 2 Ra-Si method 3 C14method 4 Uranium-lead method
first aid to person affected with electrical shock
The two elements that are frequently used for making transistors are 1 Boron and aluminium 2 Silicon and germanium 3 Iridium and tungsten 4 Niobium and columbium
Which of the following is the lightest gas? 1 Nitrogen 2 Hydrogen 3 Ammonia 4 Carbon dioxide
Which gas is used in cold store ?
The ratio of pure gold in 18 carat gold is 1 60% 2 75% 3 80% 4 100%
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is there any device to convert to mechanical energy into electrical energy
Why the diesel generator suddenly increases the output voltage and avr get shorted ... And also increases the load the generator decreases the voltage why ..and also the output power in amps generated in 30 kv diesel generator ..
Biological Sciences 
