Tag: physics

Quizzes (598) Questions (13441)

Questions Related to physics

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

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
Reveal answer Fill a bubble to check yourself
A Correct answer
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

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

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

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

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

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

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

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

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

Which of the following is a transparent?

  1. Gold

  2. Glass

  3. Stone

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

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

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