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Transparent, opaque and translucent objects - class-VII

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Transparent objects:

  1. do not let light pass through them

  2. allow light to pass through them

  3. absorb some amount of light and allow the remaining to pass through them

  4. reflect all the amount of light falling on them


Correct Option: B
Explanation:

Property of light.

Water is

  1. Transparent

  2. Translucent

  3. Opaque

  4. Polymer


Correct Option: A
Explanation:

Transparent objects allow the light to pass through them. 
Water is transparent as it allows light to pass through it.

Substances that allow light to pass through them are called

  1. Transparent

  2. Translucent

  3. Opaque

  4. None of these


Correct Option: A
Explanation:

Transparent objects are those objects that allow large quantities of light to pass through them. 

Air, water and shiny glass are all examples of transparent materials.

Transparent objects.

  1. do not let light to pass through them

  2. allow light to pass through them

  3. absorb some amount of light and allow the remaining to pass through them

  4. reflect all the amount of light falling on them


Correct Option: B
Explanation:

Transparent objects allow light to pass through them. These are objects having the property of transmitting light without any appreciable scattering so that the bodies lying beyond it are seen clearly.

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

  1. light body

  2. transparent body

  3. opaque body

  4. translucent body


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 ?

  1. oiled paper

  2. brick

  3. wood

  4. air


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 :

  1. translucent

  2. opaque

  3. most transparent

  4. completely transparent


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.

  1. Black

  2. White

  3. Red

  4. Yellow


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 :

  1. transparent body

  2. opaque body

  3. translucent body

  4. light medium


Correct Option: A
Explanation:

light can pass through a transparent body like glass

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

  1. Fire

  2. Sun

  3. Star 

  4. Tree


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

  1. transparent body

  2. translucent body

  3. opaque body

  4. None of the above


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 ?

  1. Red

  2. White

  3. Red or green

  4. Black


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 :

  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


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?

  1. Fire

  2. Sun

  3. Stars

  4. Earth


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 

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

  1. translucent

  2. opaque

  3. most transparent

  4. more transparent


Correct Option: A
Explanation:

A thin layer of water is transparent but a thick layer of water is translucent as lateral shift depends on thickness of the object.

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

  1. transparent body

  2. opaque body

  3. translucent body

  4. none of these


Correct Option: A
Explanation:

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

Air is not visible because it

  1. is nearly perfectly transparent substance

  2. neither absorbs nor reflects light

  3. transmits whole of light

  4. all the above are correct


Correct Option: D
Explanation:

Air is not visible because it is transparent medium. As from definition of transparent medium, their reflectance and emitance is zero , hence it transmits all the light.

Which of the following is a transparent?

  1. Gold

  2. Glass

  3. Stone

  4. Plastic


Correct Option: B
Explanation:

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 which do not allow the light to pass through them are called $\bf{opaque} $ objects.

Glass is a $\bf{transparent} $ object because it allows light to pass through it completely and doesn't block any light. 
Gold and Stone, on the other hand, are $ \bf{opaque} $ objects. While, Plastic is $ \bf{translucent} $.

Hence, the correct answer is OPTION B. 

A cyan colour light ray is passed through a blue filter. What is the colour of the light which comes out through the filter?

  1. Green

  2. Cyan

  3. Yellow

  4. Blue


Correct Option: D
Explanation:

The color of light coming through a filter is specific to the filter.for example blue filter will allow only blue rays to pass through it.

What is the colour of a green leaf, when white light passing through a yellow filter is incident on it?

  1. Black

  2. Blue

  3. Yellow

  4. Green


Correct Option: D
Explanation:

Color of an object visible to us is independent of the color of light incident on it. Hence a green leaf will look green even if yellow light is incident on it.

A body which allows almost all the light to pass through it and does not reflect any light is a-

  1. transparent body

  2. opaque body

  3. translucent body

  4. polished surface


Correct Option: A
Explanation:

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

Objects which do not allow the light to pass through them are called $\bf{opaque} $ objects.

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

Polished surfaces are good reflectors of light and do not allow light to pass through it. 

Hence, the correct answer is OPTION A.

A medium which partially allows the light rays to pass through it is called -

  1. transparent

  2. opaque

  3. non-luminous

  4. translucent


Correct Option: D
Explanation:
Objects or medium which allow the light to pass through them completely without any obstruction are called $ \bf{transparent} $ objects or medium.

Objects or medium which do not allow the light to pass through them are called $\bf{opaque} $ objects or medium.

Objects which do not emit light on their own are called  $ \bf{non-luminous} $ objects.

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

Hence, the correct answer is OPTION D. 

Glass allows light to pass through it because it is -

  1. transparent

  2. opaque

  3. luminous

  4. non-luminous


Correct Option: A
Explanation:

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

Objects which do not allow the light to pass through them are called $\bf{opaque} $ objects.

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.

Thus, glass allows light to pass through it because it is transparent and doesn't block any light. 

Hence, the correct answer is OPTION A.  

Cellophane paper is an example of -

  1. an opaque object

  2. a translucent object

  3. a transparent object

  4. a luminous object


Correct Option: C
Explanation:
Objects which do not allow the light to pass through them are called $\bf{opaque} $ objects.

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

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

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

Since, cellophane paper allows light to pass through it completely, it is a transparent object. Also, it doesn't emit any light. 

Hence, the correct answer is OPTION C.  

A leaf appears green when observed in sunlight because:

  1. It transmits green colour

  2. It absorbs green colour

  3. It disperses all colour, except green

  4. None of these


Correct Option: D
Explanation:

A leaf appears green in sunlight because it absorbs all the wavelength except green which allows only green color rays to reach us.

Gold is an example of a translucent metal. State whether true or false.

  1. True

  2. False


Correct Option: B
Explanation:

Gold is a metal which is an opaque object as it doesn't allow light to pass through it.

Thin glass is a transparent body. State whether true or false.

  1. True

  2. False


Correct Option: A
Explanation:

Thin glass slab acts as a transparent body as it will create very small shift in the emigrant ray which will be negligible .

Select the odd one out w.r.t. transparency (wood, stone, cement, glass)

  1. glass

  2. wood

  3. stone

  4. cement


Correct Option: A
Explanation:

It is a transparent body rest all are opaque

Select the odd one out w.r.t. transparency (air, fog, mist, tissue paper)

  1. air

  2. fog

  3. mist

  4. tissue paper


Correct Option: A
Explanation:

It is a transparent medium rest all are translucent

In ........................... lens, all the rays diverge after refraction.

  1. Concave

  2. Bi-concave

  3. Convex

  4. Bi-convex


Correct Option: A

An object is transparent if you can see through it clearly.

  1. True

  2. False


Correct Option: A
Explanation:

A transparent substance is defined as the substance through which all light incident on it normally can pass through it.And hence , it can be seen clearly through a transparent substance.


Given statement is $True$.

You can clearly see through a blue-tinted drinking glass.

  1. True

  2. False


Correct Option: B
Explanation:

Its a translucent object. light partially passes through it.

Wood is an example of opaque object.

  1. True

  2. False


Correct Option: A
Explanation:

No light passes through opaque objects and we can't see through these objects.

For example, wood.

You can clearly see through opaque objects.

  1. True

  2. False


Correct Option: B
Explanation:

It is false that you can clearly see through opaque objects as objects which are seen through are transparent and object which does not allow any light to pass through it are opaque.

Which of the following is transparent?

  1. Stone

  2. Wood

  3. Plastic

  4. Glass


Correct Option: D
Explanation:

A transparent object is one which allows all light to pass through it.
Since glass allows all the light to pass through it, so it is a transparent object.

Stone, wood and plastic are opaque materials.

Which of the following is an opaque object?

  1. Wood

  2. Glass

  3. Air

  4. Vacuum


Correct Option: A
Explanation:
Wood being an opaque object, does not allow light to pass through it.
All other objects allow light to pass through it.

Opaque objects:

  1. Allow the light to pass through them

  2. Do not let the light to pass through them

  3. Absorb some amount of light and let the remaining to pass through them

  4. Allows the light from natural sources and rejects if it is from artificial sources


Correct Option: B
Explanation:

The majority of objects are opaque, which means you can't see through them. This is due to the fact that light can't pass through them. Examples of opaque objects include wood, gold, cement, metal, some types of coloured plastic, and so on.

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