Tag: evs

Questions Related to evs

The amount of light reflected depends upon

evs light and shadow what makes things visible nature and sources of light light travels in straight line

  1. the nature of material of the object

  2. the nature of the surface

  3. the smoothness of the surface

  4. all the above

Show answer
Correct Option: D
Explanation:

The amount of light reflected depend upon the properties of the material and the surface polished.Hence reflection depends upon the smoothness of the material at which light is incident.

The ray of light which falls on a mirror is called-

evs light and shadow what makes things visible nature and sources of light light travels in straight line

  1. Reflected ray

  2. Emergent ray

  3. Incident ray

  4. Transmitted ray

Show answer
Correct Option: C
Explanation:

A $ \textbf{reflected ray}$ is a ray of light that represents the light reflected by the surface or the ray of light that bounces off the mirror.

An $ \textbf{emergent ray} $ is a ray of light which finally emerges out of the other medium back to the original medium.

An $\textbf{incident ray}$ is a ray of light approaching the mirror or falling on the mirror.

A $\textbf{transmitted ray} $ or a refracted ray is a ray of light that is transmitted into the second medium and undergoes a change of velocity and direction due to the interaction with the material medium in which it travels.

Hence, the correct answer is OPTION C. 

Objects which emit light of their own are called -

evs light and shadow what makes things visible nature and sources of light light travels in straight line

  1. non- luminous objects

  2. transparent objects

  3. translucent objects

  4. luminous objects

Show answer
Correct Option: D
Explanation:
Objects which do not emit light on their own are called  $ \bf{non-luminous}$ objects.

Objects which allow the light to pass through them completely without any obstruction are called $ \bf{transparent} $ objects.

Objects which allow the light to pass through them partially are called $ \bf{translucent} $ objects.


Objects that give out or emit light of their own are called as $ \bf{luminous} $ objects. 

Hence, the correct answer is OPTION D. 

Light is a form of energy that causes sensation of warmth or coldness

evs light and shadow what makes things visible nature and sources of light light travels in straight line

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Heat is a form of energy which causes sensation of warmth or coldness whereas light is form of energy which helps us in our vision of objects.

Reflection of the Sun's light from the upper layers of the Earth's atmosphere causes.

evs light and shadow what makes things visible nature and sources of light light travels in straight line

  1. day and night

  2. tides

  3. eclipses

  4. twilight

Show answer
Correct Option: D
Explanation:

Twilight on Earth is the illumination of the lower atmosphere when the Sun itself is not directly visible because it is below the horizon. Twilight is produced by sunlight scattering in the upper atmosphere, illuminating the lower atmosphere so that Earth's surface is neither completely lit nor completely dark.

Select the odd one out (book, chair, table, burning candle)

evs light and shadow what makes things visible nature and sources of light light travels in straight line

  1. burning candle

  2. book

  3. chair

  4. table

Show answer
Correct Option: A
Explanation:

It is a luminous object rest all are non-luminous

State whether true or false.
We can see objects only in the presence of light.

evs light and shadow what makes things visible nature and sources of light light travels in straight line

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Visibility of an object depends on the ray reaching our eyes after reflection.

A star is a/an _____ source of light

evs light and shadow what makes things visible nature and sources of light light travels in straight line

  1. natural

  2. artificial

  3. false

  4. absolute

Show answer
Correct Option: A
Explanation:

Natural sources of light are the sources which emit light on their without any man made control.Example sun,stars etc.

State whether true or false.
Moonlight is actually reflected light.

evs light and shadow what makes things visible nature and sources of light light travels in straight line

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Moon light  is actually a reflected light as moon is a natural satellite which is not a source of light.It reflects all the light from sun.

State whether true or false.
The sun is an artificial source of light.

evs light and shadow what makes things visible nature and sources of light light travels in straight line

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Artificial source of light is the man made light source which requires energy to be supplied.e.g bulb whereas sun is a star.Which is an example of natural source of light.