3793. Which of the following is a moderating material used in nuclear reactor ?
Graphite.
Cadmium.
Zircalloy (an alloy of zirconium and aluminium).
Stainless steel.
✅ The correct answer is option A.
3747. Bio-fertilisers are cheaper, renewable and pollution free. They improve the __________ of the soil.
Nutrient supply
Texture
Water holding capacity
All of the above
✅ The correct answer is option D.
3753. H₄P₂O₇ is the chemical formula of __________ phosphoric acid.
Pyro
Ortho
Meta
None of these
✅ The correct answer is option A.
3758. H₃PO₄ is the chemical formula of __________ phosphoric acid.
Pyro
Ortho
Meta
None of these
✅ The correct answer is option B.
3764. 5-10-5 fertilisers mean that they contain
5, 10, 5% respectively of N₂, P₂O₅ and K₂O
Only 5 to 10% active fertiliser constituents
5 to 10% filler & carrier of soil conditioners
None of these
✅ The correct answer is option A.
3770. Which of the following fertilisers is needed for promoting the development of leaves and stems during early stages of plant growth?
Nitrogeneous fertiliser
Potassic fertiliser
Phosphatic fertiliser
None of these
✅ The correct answer is option A.
3775. Nitrogen content of a nitrogenous fertiliser is 35%. It could be
Urea
Ammonium nitrate
Calcium ammonium nitrate (CAN)
Ammonium sulphate
✅ The correct answer is option B.
3778. A nitrogenous fertiliser contains 20% N₂. It could be
Ammonium nitrate
Calcium ammonium nitrate (CAN)
Urea
Ammonium chloride
✅ The correct answer is option B.
3780. Conversion of yellow phosphorus to red phosphorous is done in retorts at 250-450°C in the
Presence of an inert atmosphere
Presence of a reducing atmosphere
Absence of air
Presence of an oxidising atmosphere
✅ The correct answer is option C.
3748. The composition of fresh feed to the high temperature, high pressure urea autoclave is
Excess liquid ammonia and liquefied CO₂
Excess liquid ammonia and compressed CO₂ gas
Liquid ammonia and excess compressed CO₂
Compressed ammonia gas and excess compressed CO₂
✅ The correct answer is option B.