Tag: physics

Questions Related to physics

On $26^{th} January, 2001$, a major earthquake occured in _____ district of Gujarat.

physics some natural phenomena seismic waves and tsunami causes of earthquakes origin of earth and its internal energy transfer of charge lightning safety

  1. Uri

  2. Tangdhar

  3. Bhuj

  4. Kachchh

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Correct Option: C
Explanation:

On 26th January, 2001, an earthquake occurred in Bhuj district of Gujarat at a very high frequency on Richter scale.

The SI unit of power is ....................... .

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

  1. Watt

  2. Horsepower

  3. joules

  4. Kilowatt

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Correct Option: A
Explanation:
Power is defined as the rate of doing work or rate of energy consumption.
Power  $P = \dfrac{Energy}{time}$
SI unit of power is Watt.

m$^3$ is the MKS unit of ....................... .

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

  1. Length

  2. Area 

  3. Volume

  4. mass

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Correct Option: C
Explanation:
Volume of the cuboid  $V = l\times b\times h$
So, unit of volume is  $m^3$.

Symbol for steradian is ....................... .

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

  1. St

  2. Sa

  3. Sr

  4. Sn

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Correct Option: C
Explanation:

Steradian is a unit of solid angle. Symbol of steradian is Sr

Among the following identify derived quantities?

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

  1. Speed

  2. Temperature

  3. Volume

  4. Mass

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Correct Option: A,C
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.

Which of the following is larger unit of density ?

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

  1. $gm^{-3}$

  2. $gkm^{-3}$

  3. $kgm^{-3}$

  4. $gcm^{3}$

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Correct Option: D
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).

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

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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 .