Tag: physics

Quizzes (598) Questions (13441)

Questions Related to physics

Multiple choice physics heat and energy

Which of the following is not a greenhouse gas?

  1. $H _2O \ (vapour)$

  2. $CFCs$

  3. $N _2$

  4. $O _3$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In the given options,other than nitrogen gas,rest all the gases has the capability of trapping the heat rays reflecting from the earth.(they trap the heat rays because they have certain properties which are either enhanced or reduced due to heat)


Multiple choice physics heat and energy

Name of green house gases.

  1. methane

  2. oxygen

  3. nitrogen

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  1. Carbon dioxide 
    2. Methane 
    3. Nitrous oxide 
Multiple choice physics heat and energy

Which of the following greenhouse gas is not present in very high quantity?

  1. methane

  2. ethane

  3. propane

  4. $CO _2$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A greenhouse gas is a gas that absorbs and emits radiant energy within the thermal infrared range. Greenhouse gases cause the greenhouse effect on planets. The primary greenhouse gases in Earth's atmosphere are water vapour $(H _2O)$, carbon dioxide $(CO _2)$, methane $CH _4)$, nitrous oxide $(N _2O)$ and ozone $(O _3)$. Among the given gases, $CO _2$ is not present in very high quantity.

Multiple choice physics heat and energy

The extent that a greenhouse gas warms the Earth depends on:

  1. the length of time it remains in the atmosphere

  2. its ability to absorb energy

  3. both A and B

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Scientists use these factors to calculate a gass global warming potential, which measures how much heat it absorbs per pound.

Multiple choice physics heat and energy

The earth's transparent for the ________ radiations of short wavelengths coming from the sun.

  1. Infrared

  2. UV

  3. X ray

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

Process of warming of planet's surface and its lower atmosphere by the absorption of infrared radiations of long wavelength given out from the surface of a planet is known as green house effect.  In 1824, Joseph Fourier discovered the green house effect. The earth's transparent for the infrared radiations of short wavelengths coming from the sun. The high energy radiations such as X rays, gamma rays, UV rays are absorbed by the ozone layer while the low energy radiations namely infrared radiations of long wavelength and radio waves are reflected back into the space.

Multiple choice physics heat and energy

Greenhouse gases keep the earth:

  1. Cool

  2. Warm

  3. No effect

  4. Information insufficient
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Since greenhouse gases trap heat rays (infrared rays) which due to irradiation keeps the earth warm.

Multiple choice physics heat and energy

Process of warming of planet's surface and its lower atmosphere by the absorption of infrared radiations of long wavelength given out from the surface of a planet.

  1. Global warming

  2. Green house effect

  3. Pasteur effect

  4. All
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Process of warming of planet's surface and its  lower atmosphere by the absorption of infrared radiations of long wavelength given out from the surface of a planet is known as green house effect. In 1824, Joseph Fourier discovered the green house effect.

Multiple choice physics heat and energy

Greenhouse gases absorb:

  1. Ultraviolet radiations

  2. Visible light radiations

  3. Microwave radiations

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

They trap the heat rays because they have certain properties which are either enhanced or reduced due to heat.Capturing infrared rays is a characteristic properties of greenhouse gases.


Multiple choice physics heat and energy

Without green house effect, the average temperature of earth's surface would have been

  1. -18$^o$C

  2. 33$^o$C

  3. 0$^o$C

  4. 15$^o$C
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The greenhouse effect itself occurs when short-wave solar radiation (which is not impeded by the greenhouse gases) heats the surface of the Earth, and the energy is radiated back through the Earth's atmosphere as heat, with a longer wavelength. In the wavelengths 5-30m a lot of this thermal radiation is absorbed by water vapour and carbon dioxide, which in turn radiate it, thus heating the atmosphere and land and ocean surface. This is natural and what keeps the Earth habitable.

Without the greenhouse effect overnight temperatures would plunge and the average surface temperature would be about minus 18C, about the same as on the moon, which lacks the shroud of our atmosphere.
Thus Option A is correct.

Multiple choice physics heat and energy

After $CO _2$, which greenhouse gas accounts for the next largest share?

  1. Suphur dioxide

  2. Methane

  3. Nitrous Oxide

  4. Hydrofluorocarbons
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Methaneemitted from landfills, coal mines, oil/gas operations, and agricultural livestockaccounted for 10 percent of U.S. greenhouse gas emissions.