Tag: energy production

Questions Related to energy production

Why should a radioactive substance not be touched by hand?

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

  1. It is hot

  2. It is very cold

  3. It can harm our body

  4. None of the above

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Correct Option: C
Explanation:
Because it emits a lot of harmful radiations that penetrate our body and cause serious damage to the cells.

In the process of Radio active decay the correct example is _____.

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

  1. $ _6C^{14} \xrightarrow[of \,\propto \,particle]{emission} { _7C^{15}}$

  2. $ _6C^{14} \xrightarrow[of \,\propto \,particle]{emission} { _7N^{15}} + 1e$

  3. $ _6C^{14} \xrightarrow[of \,\propto \,particle]{Absorption} { _7N^{15}}$

  4. None of these

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Correct Option: D

What safety precautions that you would take while handling the radioactive substances?

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

  1. Always wear gloves

  2. Don't wear gloves

  3. Wear a proper coat provided in lab

  4. None of the above

Show answer
Correct Option: A,C
Explanation:
While handling the radioactive substances,
$\rightarrow$ Always wear gloves.
$\rightarrow$ Wear proper coats provided in the labs.
$\rightarrow$ Keep personal items like handbags, lunchboxes etc. outside the lab.

Two radioactive samples $A$ and $B$ have half lives ${T} _{1}\ and {T} _{2}\left ({T} _{1}>{T} _{2}\right)$ respectively. At $t = 0$, the activity of $B$ was twice the activity of $A$. Their activity will become equal after a time 

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

  1. $\dfrac {{T} _{1}{T} _{2}}{{T} _{1}-{T} _{2}}$

  2. $\dfrac {{T} _{1}-{T} _{2}}{2}$

  3. $\dfrac {{T} _{1}+{T} _{2}}{2}$

  4. $\dfrac {{T} _{1}{T} _{2}}{{T} _{1}+{T} _{2}}$

Show answer
Correct Option: A

The people working with radioactive materials should put on special

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

  1. iron lined aprons and copper gloves.

  2. silver lined aprons and silver gloves.

  3. lead lined aprons and lead gloves

  4. any of the above can be used.

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Correct Option: C
Explanation:

The people working with radioactive naturals are required to follow strictly the safety rules like they should put on special lead lined aprons and lead gloves. They should handle the radioactive naturals with long lead tongs.

A beam of monochromatic light first travels through glass of R.I. $1.5$ and then through water (R.I. $=\dfrac{4}{3}$). If the difference in their wavelengths in the two media is $40$nm, then the wavelength of the monochromatic light in vacuum will be?

physics energy production scattering of light and its applications some natural phenomena of light effects of light

  1. $4000\overset{o}{A}$

  2. $4400\overset{o}{A}$

  3. $4800\overset{o}{A}$

  4. $5200\overset{o}{A}$

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Correct Option: B

The increase of carbon dioxide gas in atmosphere will cause

physics energy production causes of greenhouse effect global warming adaptation in animals

  1. decrease in temperature

  2. increase in temperature

  3. no change in temperature

  4. nothing can be said

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Correct Option: B
Explanation:

Carbon dioxide is main cause of green house effect. The greenhouse effect is the rise in temperature that the Earth experiences because certain gases in the atmosphere (water vapor, carbondioxide, nitrous oxide, ozone, methane, for example) trap energy that comes from the sun.
Thus, increase of carbon dioxide gas in atmosphere will cause increase in temperature.

The average temperature of the Earth remains fairly steady as compared to that of the moon because of the

physics energy production causes of greenhouse effect global warming adaptation in animals

  1. atmosphere

  2. lithosphere

  3. biosphere

  4. hydrosphere

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Correct Option: A
Explanation:

The average temperature of the earth remains fairly steady as compared to that of the moon because of the earth's atmosphere. Atmosphere of earth absorbing ultraviolet solar radiation, warming the surface through heat retention (green house effect), and reducing temperature extremes between day and night. Moon has no atmosphere. 

The global warming has resulted in :

physics energy production causes of greenhouse effect global warming adaptation in animals

  1. the increase in yield of crops

  2. the decrease in sea levels

  3. the decrease in human deaths

  4. the increase in sea levels

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Correct Option: D
Explanation:

The effects of an increase in global temperature include a rise in sea level rise (due to melting of snow and ice and because water above 3.98 C expands as it warms), widespread melting of snow and ice, increased heat content of the oceans, increased humidity, and the earlier timing of spring events.
Option D is correct.

Name the radiation which are absorbed by the green house gases.

physics energy production causes of greenhouse effect global warming adaptation in animals

  1. X-ray

  2. Ultraviolet

  3. Visible

  4. Infrared

Show answer
Correct Option: D
Explanation:

    The short wavelength (high frequency) infrared radiations  come from sun to earth's surface and after reflection from surface , turn into long wavelength infrared radiations , these long wavelength radiations are absorbed by green house gases .