increases
lowers
does not affect
either (a) or (b); depends on its quantity
✅ The correct answer is option B.
Engineering
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3432. Moderating material used in a thermal-reactor should be a
good absorber of neutrons.
solid substance.
poor absorber of neutrons.
none of these.
✅ The correct answer is option C.
3433. Pyrometric cone equivalent (PCE) value (Segar cone) of ‘superduty refractories’ is more than 33 which corresponds to a temperature of __________ °C.
1520
1630
1670
1730
✅ The correct answer is option D.
3434. __________ is not a single oxiderefractory.
Zirconia
Silicon carbide
Magnesia
None of these
✅ The correct answer is option B.
3435. When the difference between mass number and atomic number of atoms of two or more elements are same, the atoms are termed as
isomers
isotopes
isobars
isotones
✅ The correct answer is option D.
3436. Uranium Corporation of India Limited (UCIL) engaged in the mining & concentration of uranium ore is located at
Alwaye (in Kerala)
Jadugoda (in Jharkhand)
Kalpakkam (in Tamilnadu)
Gopalpur coast (in Orissa)
✅ The correct answer is option B.
3437. The main ore of thorium is
pitchblende
monazite sand
limonite
galena
✅ The correct answer is option B.
3438. Firing temperature of magnesite bricks is about __________ °C.
800-1000
1000-1200
1600-1800
2400-2600
✅ The correct answer is option C.
3439. Magnesite refractories are used for the construction of those furnaces, which are
not required to resist the corrosive action of basic slag.
not subjected to fluctuation in temperature.
used for raising & maintaining high temperature.
both (b) and (c)
✅ The correct answer is option D.
3440. The decrease in the atomic number is not observed in case of
electron capture
β-emission
α-emission
positron emission
✅ The correct answer is option B.