Tag: nuclear physics

Quizzes (6) Questions (198)

Questions Related to nuclear physics

Multiple choice physics nuclear physics hazards and safety measures of radiations harmful effects and safety precautions for radiations energy production

The rad is the correct unit used to report the measurement of 

  1. the rate of decay of radioactive source

  2. the ability of a beam of gamma ray photons to produce ions in a target

  3. the energy delivered by radiation to a target.

  4. the biological effect of radiation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Rad is the unit of absorbed dose of ionizing radiation. One rad is equal approximately to the absorbed dose delivered when soft tissue is exposed to one-roentgen of medium-voltage radiation.  Thus this is the bilogical effect of radiation. 

Multiple choice physics nuclear physics hazards and safety measures of radiations harmful effects and safety precautions for radiations energy production

Radiation exposure comes from

  1. Background Sources

  2. Manmade sources

  3. Medical processes

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Because of Man made processes , there will be radiation exposure. For example we can take bricks , it causes radiation

Because of Medical processes , we will get several radiation exposures . For example X ray radiation etc
Background sources also causes radiation
Therefore option $D$ is correct

Multiple choice chemistry nuclear physics hazards and safety measures of radiations harmful effects and safety precautions for radiations energy production

The various types of nuclear reactors that have been constructed to furnish heat for the production of steam differ from each other in what ways? 

  1. In what kind of moderator is used

  2. How the reactor core is cooled

  3. How the heat energy is used to generate steam

  4. They can differ in all of the above ways
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

They can differ in all the above ways 

A nuclear reactor can be classified depends on the moderator used, reactor core cooling method, use of heat energy and many more. 

Multiple choice chemistry nuclear physics hazards and safety measures of radiations harmful effects and safety precautions for radiations energy production

Which of the following hazards is not associated with a liquid metal breeder reactor (LMFBR)?

  1. little fissionable material is formed

  2. a sodium explosion occurs if it comes in contact with water

  3. the plutonium by-product can be made into nuclear weapons and, therefore, poses a security risk

  4. all of the above are hazards associated with the LMFBR
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A

Liquid Metal Fast brecedes reactor (LMFBR) is a nuclear reactor capable of producing more fissile product than it takes in. 

Multiple choice physics nuclear physics hazards and safety measures of radiations harmful effects and safety precautions for radiations energy production

The effective area of a black body is 0.1 $m^2$ and its temperature is 1000 K. The amount of radiations emitted by it per min is -

  1. 1.34 k-cal

  2. 81 k-cal

  3. 5.63 k-cal

  4. 1.34 k-J.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$\begin{array}{l} \dfrac { { d\emptyset  } }{ { dt } } =A6T{ Y^{ 4 } } \ =81\, \, kcal \end{array}$

Multiple choice chemistry nuclear physics types of radioactivity nuclear chemistry and radioactivity radioactivity

The radioactive isotope used in the treatment of cancer has to be a good source of ________ radiations.

  1. $\beta$
  2. $\alpha$
  3. $\gamma$
  4. $IR$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

X-rays, gamma rays and beta particles are all used in medicine to treat internal organs. X-rays are produced by firing electrons at a metal target and gamma rays are emitted by the nucleus of radioactive atoms. Gamma rays are used to kill cancer cells, to sterilize medical equipment and in radioactive tracers.

Multiple choice chemistry nuclear physics types of radioactivity nuclear chemistry and radioactivity radioactivity

Match the following

List - I List - II
A) Functioning of Thyroid gland  I) Cobalt - 60
B) Blood disorders  II) Iodine - 131
C) Cancer  III) Sulphur - 35
D) Transportation of minerals in plants  IV) radio phosphorus
V) radio sodium

  1. A-I,III B- II,IV C-III,V D-IV

  2. A-II B-IV,V C-I D-III

  3. A-I B-II C-IV D-III

  4. A-II B-I C-III D-IV
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

 1.Iodine - 131 it is use for functioning of Thyroid gland. It detect using radio active Iodine - 131

2.Radioactive phosphorus is known as P-32. It is a radioactive form of sodium phosphate. It is used as a treatment for some blood disorders.

3.Cobalt therapy or cobalt-60 therapy is the medical use of gamma rays from the radioisotope cobalt-60 to treat conditions such as cancer.

4.The sulfate ions in the solution contained radioactive sulfur atoms – 35 S. The purpose of this investigation was to investigate active transport, that is, a process that uses energy to transport useful substances across cell membranes.

 

Multiple choice chemistry nuclear physics types of radioactivity nuclear chemistry and radioactivity radioactivity

The count rate observed from a radioactive source at $t$ second was $N _0$ and at $4t$ second it was $\dfrac{N _0}{16}$. The count rate observed at $\left(\dfrac{11}{2}\right)t$ second will be

  1. $\dfrac{N _0}{128}$
  2. $\dfrac{N _0}{64}$
  3. $\dfrac{N _0}{32}$
  4. $None\ of\ these$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
after n lives,

$N=N _0\left ( \dfrac{1}{2} \right )$

initially,

$t=t$

$t=4t-t=3t$

$\dfrac{N _0}{16}=N _0\left ( \dfrac{1}{2} \right )^n$

$n=4$

$4t _{\frac{1}{2}}=3t$

$\Rightarrow t _{\frac{1}{2}}=\dfrac{3}{4}t$

$\lambda =\dfrac{\ln 2}{t _{\frac{1}{2}}}=\dfrac{4\ln 2}{3t}$

at $t=\dfrac{11}{2}ts$

$t=\dfrac{11}{2}t-t=\dfrac{9}{2}t$

$N=N _0e^{-\lambda \frac{9}{2}t}$

$N=N _0e^{-\lambda \frac{4\ln 2}{3t}\times \frac{9}{2}t}$

$N=N _0e^{-6\ln 2}$

$N=N _0e^{\ln \frac{1}{2^6}}$

$N=\dfrac {N _0}{2^6}=\dfrac {N _0}{64}$
Multiple choice chemistry nuclear physics types of radioactivity nuclear chemistry and radioactivity radioactivity

After $280$ days, the activity of a radioactive sample is $6000 dps$. The activity reduces to $3000 dps$ after another $140 days$. The initial activity of the sample in $dps$ is:

  1. $6000$
  2. $9000$
  3. $3000$
  4. $24000$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Here, the activity of the radioactive sample reduces to half in $140$ days. Therefore, the half life of the sample is $140$ days. $280$ days is it's two half lives. So before two half lives it's activity was

${2^6} \times 6000 = 24000\,dps.$
Hence, the option $D$ is the correct answer.