Tag: nature and sources of light

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Questions Related to nature and sources of light

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

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

  1. Silver

  2. Mercury

  3. None

  4. All kind of shiny materials
Reveal answer Fill a bubble to check yourself
D Correct answer
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.)

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

We are able to see objects around us because ______________.

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

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

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

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Choose the correct option

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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. 

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

Choose the correct option regarding luminous objects

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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

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

Which of the following is not a luminous object

  1. Sun

  2. Moon

  3. Bulb

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

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

Moon is a non-luminous object because it does not emits it's own light and glows by reflecting the light of the sun.
Sun, Bulb and candle give out or emit their own light and hence, are luminous objects.

Hence, the correct answer is OPTION B.

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

Which of the following are not non-luminous objects ?

  1. Moon

  2. Planets

  3. Sun

  4. Earth
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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

Sun is a source of light and thus, gives out or emits light of it's own and hence, is a luminous object.

Moon, planets and Earth are non-luminous objects because they do not emit light of their own and glow by reflecting the light of the sun. 

Hence, the correct answer is OPTION C.