Tag: elementary ideas of astronomy

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Multiple choice evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

Light waves:

  1. require air or another gas to travel through

  2. require an electric field to travel through

  3. require a magnetic field to travel through

  4. can travel through perfect vacuum
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Light is an electromagnetic wave which is transverse in nature. It does not require any material medium to pass through and can travel through vacuum.

Multiple choice evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

Find out the only wrong statement in the following:

  1. Light travels with a speed greater than that of sound

  2. Light cannot travel through vacuum

  3. Light travels in a straight line

  4. Light has no weight
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Light is an electromagnetic wave which is transverse in nature. So, it does not require any material medium to pass through. Light, thus, can travel through vacuum.

Multiple choice evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

We can see an object from every direction due to ____________ of the incident light ray on the object.

  1. regular refraction

  2. regular reflection

  3. irregular reflection

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

Irregular reflection makes us see all the objects and everything around us. If light gets regularly reflected then every object would act like a mirror and our surroundings would be illuminated. This would have a blinding effect on eyes making it harder for us to see.

Multiple choice evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

A leaf which contains only green pigments, is illuminated by a laser light of wave length 0.6328 $\mu$ m. It wound appear to be:

  1. Brown

  2. Black

  3. Red

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

0.6328 $\mu m$ = $6328 \mathring A$
This is wavelength of red colour. So, this light will be absorbed by green pigments. 
The leaf will appear black.

Multiple choice physics effects of light eclipses elementary ideas of astronomy shadow formation and optical medium

What is known as an eclipse?

  1. Astronomical event when one celestial body partially or totally cover another celestial object

  2. Astronomical event when one celestial body cover another meteor

  3. Astronomical event when one meteor partially or totally cover another meteor

  4. None
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An eclipse is an event where one heavenly body compeletely or partially blocks the light from the other heavenly body.

Multiple choice physics effects of light eclipses elementary ideas of astronomy shadow formation and optical medium

Which type of eclipse is known when Earth, Moon and Sun doesn't align in straight line and Moon only partially covers sun?

  1. Total Solar Eclipse

  2. Partial Solar Eclipse

  3. Annular Solar Eclipse

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When Moon is between the Sun and the Earth but doesn't align in a straight line results in a partial solar eclipse.

Partial Solar Eclipse is known when Earth, Moon and Sun doesn't align in straight line and Moon only partially covers sun.

Multiple choice physics effects of light eclipses elementary ideas of astronomy shadow formation and optical medium

State whether the given statement is true or false :

Looking at a solar eclipse without any protective eyewear can severely harm your eyes. 

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Looking at a solar eclipse without any protective eyewear can severely harm your eyes. It is safe to look at the Sun during the total solar eclipse since Moon cover the Sun totally. However, it is not safe to look at the Sun during solar eclipse, other than the total solar eclipse.