In vulcanization, natural rubber is heated with
1 Carbon
2 Sulphur
3 Silicon
4 Phosphorus
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Which of the following roofs provide better protection against heat? 1 Cement slab 2 Asbestos sheets 3 Reinforced concrete 4 None of these
What are reflecting nebulae?
In an atomic nucleus, neutrons and protons are held together by 1 Gravitational forces 2 Magnetic forces 3 Exchange force 4 Coulombic forces
How long can arihant stay underwater?
The age of most ancient geological formations is estimated by 1 Potassium-argon method 2 Ra-Si method 3 C14method 4 Uranium-lead method
Chemical formula for water glass is 1 Na2Sio3 2 Al2O3 3 NaA1O2 4 CaSiO3
why ammonia cylinder getting icing outside of cylinder when it approx half or less than it...??
PVC is obtained by the polymerization of 1 Propene 2 Vinyl chloride 3 Styrene 4 Acetylene
Quartz crystals normally used in quartz clocks etc. is chemically 1 Sodium silicate 2 Germanium oxide 3 Silicon dioxide 4 None of these
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
Which of the following is used to coagulate synthetic fibers from solution? 1 Hydrochloric acid 2 Sulphuric acid 3 Nitric acid 4 None of these