3421. The new nucleus formed after β-decay of a radioactive element has
less atomic number
less atomic weight
more atomic number
more atomic weight
✅ The correct answer is option A.
Chemical Engineering
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3422. Carbon bricks are not used in the lining of the
combustion chamber of blast furnace stoves.
electric furnaces.
highly chemical resistant equipments.
blast furnace hearth.
✅ The correct answer is option A.
3423. Absorption/scattering cross-section of an element is expressed in “barn”, which is equivalent to
10-24 cm2
10-12 cm
1 Angstrom
10-24 cm
✅ The correct answer is option A.
3424. Fusion point of an acidic refractory material is
increased by the addition of basic oxides.
reduced by the addition of basic oxides.
not affected by the addition of basic oxides.
always more than 2500°C.
✅ The correct answer is option B.
3425. The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be __________ of its original weight.
1-Feb
1-Apr
1-Aug
Jan-16
✅ The correct answer is option D.
3426. Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the
washing action of metal.
corrosion by layer of slag.
both (a) & (b).
neither (a) nor (b).
✅ The correct answer is option A.
3427. Fission of U-235 on slow neutron bombardment can be represented by
92U235 + 3 γ1 56Ba143 + 36Kr90
92U235 + 0n1 56Ba143 + 36Kr90 + 3 0n1
92U235 + 0n1 56Ba143 + 36Kr90 + 3 0n1 + Q (energy)
92U235 + 0n1 92U236 + 30n1+ Q (energy)
✅ The correct answer is option C.
3428. Which is not an acidic refractory ?
Silica
Fireclay
High alumina refractory
Carbon black
✅ The correct answer is option D.
3429. In the gaseous diffusion process of uranium enrichment, the natural uranium is converted into gaseous
uranium oxide
uranium hexaflouride
uranium carbide
uranium sulphate
✅ The correct answer is option B.
3430. The main ore of uranium is
pitchblende
monazite sand
cassiterite
chalcopyrite
✅ The correct answer is option A.