1. Calculate the energy produced when \(1\ kg\) of substance is fully converted into energy. [Note: \(C\ =\) \(3 \times{10^8}\) \(ms^{-1}\)] [March 2015 and March 2014]
According to Einstein's mass-energy equivalence,
On substituting the given values in the above formula, we get
\(J\)
2. What is moderator? [June 2011]
A moderator is utilised to slow down the high-energy, neutrons to produce neutrons. The most commonly used moderator is , out of which is the efficient moderator.
3. Water is preferred as a coolant. Why? [June 2011]
3. Water is preferred as a coolant. Why? [June 2011]
A coolant is mainly used to produce by removing the produced in the reactor core. This steam helps to run a to generate . Hence, water is the most efficient and commonly used coolant.
4. Name any four research reactors located in \(BARC\). [June 2011]
(i)
(ii)
(iii)
(iv)
5. Give any five differences between Natural radioactivity and Artificial radioactivity. [June 2011]
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Natural radioactivity
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Artificial radioactivity
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Emission of radiation due to the of a nucleus.
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Emission of radiation due to the disintegration of a nucleus through the process.
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| radiation is emitted. | Elementary particle like is emitted. |
| It is a process. | It is an process. |
| Requires energy to carry out the process. | Requires energy to carry out the process. |
| is an example. | is an example. |