Tag: what makes things visible

Questions Related to what makes things visible

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.

The silvering on the back surface of a mirror can be done by

evs light, shadows and images what makes things visible nature and sources of light light travels in straight line

  1. Silver

  2. Mercury

  3. None

  4. All kind of shiny materials

Show answer
Correct Option: D
Explanation:

A plane mirror is made from a few mm thick glass plate.one surface of glass plate is polished to a high degree of smoothness which forms the front part of the mirror and the other(back)surface is silvered(I.e painted with silver,mercury or some other material.)

Light is a form of energy.

evs light, shadows and images what makes things visible nature and sources of light light travels in straight line

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Light is a form of energy which does not require any medium to travel.

State whether true or false:
Luminous objects emit light on their own.

evs light, shadows and images what makes things visible nature and sources of light light travels in straight line

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Luminous objects are the objects which emit light on their own by various change in form energies for example bulb or sun.

We are able to see objects around us because ______________.

evs light, shadows and images what makes things visible nature and sources of light light travels in straight line

  1. The objects absorb all the light

  2. The light reflected from the object enters our eyes

  3. Light can be reflected

  4. Light travels in straight lines

Show answer
Correct Option: B
Explanation:

An object is visible to us only if light reflected or emitted by it reaches our eye and image is formed at retina.

When a light ray is reflected repeatedly by a set of parallel plane mirrors, the intensity of light rays decreases after some reflections. This is because of

evs light, shadows and images what makes things visible nature and sources of light light travels in straight line

  1. Poor reflection from mirrors

  2. Absorption of some amount of light by mirrors

  3. Dispersion of light when the rays travel through the atmosphere

  4. Scattering of light by the mirrors

Show answer
Correct Option: B
Explanation:

The intensity of the light is decreased because no surface is perfectly reflecting surface. When the light is incident on a reflecting surface some part of the light is observed, resulting in decrease in the intensity.

State whether true or false :

A rose appears red in white light as it absorbs red color and reflects all other colors.

evs light, shadows and images what makes things visible nature and sources of light light travels in straight line

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

False

A rose reflects red color and absorbs other colors . That's why it appear red. 

Choose the correct option

evs light, shadows and images what makes things visible nature and sources of light light travels in straight line

  1. Moon is a luminous object because it glows

  2. Moon is a luminous object because it is a source of light

  3. Sun is a luminous object because it is a source of light

  4. Sun is not a luminous object

Show answer
Correct Option: C
Explanation:

Objects that give out or emit light of their own are called as $ \bf{luminous\ objects} $. 
Objects which do not emit light on their own are called  $ \bf{non-luminous} $ objects.

Sun is a luminous object because it a source of light and consequently emits light of it's own.
Moon is a non-luminous object because it does not emits it's own light and glows by reflecting the light of the sun.

Hence, the correct answer is OPTION C. 

Choose the correct option regarding luminous objects

evs light, shadows and images what makes things visible nature and sources of light light travels in straight line

  1. All objects which glow are luminous objects

  2. Objects which is not source of light is luminous objects

  3. Objects which glow can be luminous objects

  4. None of the above

Show answer
Correct Option: C
Explanation:

Luminous objects can be defined as objects which emit their own light by use of some reactions or energy source.