Tag: physics

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Multiple choice physics measurements and units some examples of derived units fundamental and derived quantities fundamental and derived units

Among the following identify derived quantities?

  1. Speed

  2. Temperature

  3. Volume

  4. Mass
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Explanation

(A) Speed $\displaystyle = \frac{distance}{time}$ - a derived quantity of length and time.
(B) Temperature - fundamental quantity.
(C) Volume (cube of length) - a derived quantity of length.
(D) Mass - fundamental quantity.

Multiple choice physics measurements and units some examples of derived units fundamental and derived quantities fundamental and derived units

Which of the following is larger unit of density ?

  1. $gm^{-3}$
  2. $gkm^{-3}$
  3. $kgm^{-3}$
  4. $gcm^{3}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
m is the mass of an object divided by its volume. Density often has units of grams per cubic centimeter (g/cm3). Remember, grams is a mass and cubic centimeters is a volume (the same volume as 1 milliliter).
Multiple choice physics energy production causes of greenhouse effect global warming adaptation in animals

The increase of carbon dioxide gas in atmosphere will cause

  1. decrease in temperature

  2. increase in temperature

  3. no change in temperature

  4. nothing can be said
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. atmosphere

  2. lithosphere

  3. biosphere

  4. hydrosphere
Reveal answer Fill a bubble to check yourself
A Correct answer
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. 

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

The global warming has resulted in :

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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

  1. X-ray

  2. Ultraviolet

  3. Visible

  4. Infrared
Reveal answer Fill a bubble to check yourself
D Correct answer
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 .