1
2
3
5
✅ The correct answer is option B.
Engineering
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3642. β-rays emission in radioactive disintegration is always accompanied by the emission of
γ-rays
α-rays
neutrons
none of these
✅ The correct answer is option A.
3643. Percentage of U-238 in natural uranium is around
0.71
99.29
0.015
29.71
✅ The correct answer is option B.
3644. Which is the most commonly used molten metal for cooling of nuclear reactors ?
Calcium
Sodium
Mercury
Zinc
✅ The correct answer is option B.
3645. The most abundant isotope of natural uranium is
92U238
92U235
92U234
none of these
✅ The correct answer is option A.
3646. __________ have the same mass number, but different nuclear charge.
Isotopes
Isobars
Isotones
none of these
✅ The correct answer is option B.
3647. The second underground nuclear test was conducted by India at
Jaisalmer
Pokhran
Kalpakkan
Narora
✅ The correct answer is option B.
3648. Artificially produced radioactive isotopes are used for
power generation.
treatment of certain diseases.
initiating nuclear fission and fusion.
all (a), (b) and (c).
✅ The correct answer is option B.
3649. Fast breeder reactors do not
use Th-232 as fissile fuel.
convert fertile material to fissile material.
use fast neutrons for fission.
use molten sodium as coolant.
✅ The correct answer is option A.
3650. Which of the following reactors is operated at high neutron flux and low power level ?
Breeder reactor.
Research reactor.
Heterogeneous reactor.
Liquid metal (e.g., molten sodium) cooled reactor.
✅ The correct answer is option B.