Tag: physics

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

State whether true or false.
The shadow formed by a red opaque object is red in colour.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A shadow is a dark area where light from a light source is blocked by an opaque object. It occupies all of the three-dimensional volume behind an object with light in front of it. Hence the shadow formed by any color opaque object will be black only.

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

Substances that allow light to pass through them are called

  1. Transparent

  2. Translucent

  3. Opaque

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

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

Name the body which absorbs all colours.

  1. Black

  2. White

  3. Red

  4. Yellow
Reveal answer Fill a bubble to check yourself
A Correct answer
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.