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Radioactivity



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Q1. A radioactive isotope undergoes decay with respect to time following __________ law.

(a) logarithmic
(b) exponential
(c) inverse square
(d) linear

Q2. A fast breeder reactor employs __________

(a) U-235 as a fuel
(b) water as a coolant
(c) graphite as a moderator
(d) none of the mentioned

Q3. Graphite is used in nuclear reactor as __________

(a) lubricant
(b) fuel
(c) retarder of neutron velocity
(d) insulation lining of the reactor

Q4. Uranium ore is currently mined & concentrated at __________

(a) Khetri
(b) Alwaye
(c) Ghatsilla
(d) Jadugoda

Q5. Percentage of U-238 in natural uranium is around __________

(a) 29.71
(b) 99.29
(c) 0.015
(d) 0.71

Q6. Which of the following ores contains maximum percentage of uranium?

(a) Rescolite
(b) Thorium
(c) Pitchblende
(d) Carnotite

Q7. The half-life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half-life period of a radioactive substance is one month, then?

(a) it will completely disintegrate in two months
(b) l/8th of it will remain intact at the end of four months
(c) 3/4th of it will disintegrate in two months
(d) it will completely disintegrate in four months

Q8. Atoms with same number of neutrons, but different number of nucleons are called __________

(a) Isobars
(b) Isotones
(c) Isotopes
(d) Isoters

Q9. __________ have the same mass number, but different nuclear charge.

(a) Isotones
(b) Isobars
(c) Isotopes
(d) Isoemtropic

Q10. Fast breeder nuclear reactors using enriched uranium as fuel may contain upto a maximum of __________ percent of U-235 (i.e. fissile material).

(a) 15
(b) 45
(c) 65
(d) 85


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355 views

On Bombarding 7N14 With α - Particles, The Nuclei Of The Product Formed After The Release Of A Proton Will Be

Modified 231 Year Ago

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231 Year Ago

On Bombarding 7N14 With α - Particles, The Nuclei Of The Product Formed After The Release Of A Proton Will Be

0 votes
0 Answer
274 views

β-particle Is Emitted In A Radioactive Reaction When

Modified 6 Year Ago

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6 Year Ago

β-particle Is Emitted In A Radioactive Reaction When

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0 Answer
268 views

The Number Of Beta Particles Emitted In The Radioactive Decay From 238/92 U And 206/82 Pb Is

Modified 6 Year Ago

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6 Year Ago

The Number Of Beta Particles Emitted In The Radioactive Decay From 238/92 U And 206/82 Pb Is

0 votes
0 Answer
266 views

When Any Radioactive Element Emits B-particle Some Product Is Obtained. They Both Are

Modified 6 Year Ago

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6 Year Ago

When Any Radioactive Element Emits B-particle Some Product Is Obtained. They Both Are

0 votes
0 Answer
264 views

A Position Is Emitted From 23/11 Na. The Ratio Of The Atomic Mass And Atomic Number Of The Resulting Nuclide Is

Modified 6 Year Ago Neysa

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Neysa
6 Year Ago

A Position Is Emitted From 23/11 Na. The Ratio Of The Atomic Mass And Atomic Number Of The Resulting Nuclide Is

0 votes
0 Answer
257 views

Which Of The Following Nuclear Transformation Is (n, P) Type

Modified 231 Year Ago Ankush Sharma

257
Ankush Sharma
231 Year Ago

Which Of The Following Nuclear Transformation Is (n, P) Type

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