Tag: light and shadow

Questions Related to light and shadow

A substance through which light can pass is called a/an :

physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

  1. light body

  2. transparent body

  3. opaque body

  4. translucent body

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Correct Option: B
Explanation:

An object is defined as transperent when it allows all the rays striking on its surface to pass through it.

Which of the following body allows only a part of the light to pass through it ?

physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

  1. oiled paper

  2. brick

  3. wood

  4. air

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Correct Option: A
Explanation:

An object is defined as translucent object when it allows only a part of it to pass through it. For example an oiled paper.

A thin layer of water is transparent but a very thick layer of water is :

physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

  1. translucent

  2. opaque

  3. most transparent

  4. completely transparent

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Correct Option: A
Explanation:

Greater is the thickness of the layer of water, lesser the amount of light it allows to pass through

Name the body which absorbs all colours.

physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

  1. Black

  2. White

  3. Red

  4. Yellow

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Correct Option: A
Explanation:

Black objects absorb all colours so no light is reflected.

Black really isn't a color. Its the absence of colour. Colours have the colour they do because the named colour is the light colour that they reflect. In other words a red item reflects red light and absorbs all other colours. A blue coloured item reflects blue and absorbs all other colours except blue. So when an item is said to be black, it reflects no colour: therefore all colours are absorbed.

A body which allows most of the light to pass through it is called a :

physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

  1. transparent body

  2. opaque body

  3. translucent body

  4. light medium

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Correct Option: A
Explanation:

light can pass through a transparent body like glass

Which of the following is a $non-luminous$ body?

physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

  1. Fire

  2. Sun

  3. Star 

  4. Tree

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Correct Option: D
Explanation:

Fire, Sun and star have produce visible  light, But Tree do not produce visible light So Tree will be non-luminous body.

A substance through which light can pass completely is called a/an

physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

  1. transparent body

  2. translucent body

  3. opaque body

  4. None of the above

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Correct Option: A
Explanation:

A substance is said to be transparent if light can pass easily through it. Example: glass

A substance is said to be translucent if light passes only partially through it. Example: Butter paper
A substance is said to be opaque if light does not pass through it. so, we can't see through these objects. Example: paper

An object looks red when seen through a piece of red glass. What is the actual colour of the object ?

physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

  1. Red

  2. White

  3. Red or green

  4. Black

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Correct Option: A
Explanation:

An object looks red when seen through apiece of red glass, hence the color of object is red as it doesn't matter what color the glass is as the refractive index of the medium is constant, hence the object will look of its original color.

Air is not visible because it :

physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

  1. is a nearly perfectly transparent substance

  2. neither absorbs nor reflects light

  3. transmits whole of light

  4. all of the above are correct

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Correct Option: D
Explanation:

The absorptive capacity of air is very low, hence it transmits most of the light rays passing through it.

Which of the following is a non-luminous body?

physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

  1. Fire

  2. Sun

  3. Stars

  4. Earth

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Correct Option: D
Explanation:

Non luminous body is a body which does not emit light rays.Example earth,sun is a star and it is a luminous body like fire