Tag: nature of things

Questions Related to nature of things

Multiple choice evs nature of things properties of materials grouping and classification of objects sorting materials into groups

A block of iron (density 9.8 $ \displaystyle g/cm^{3}) $ if added in mercury (density 13.6 $ \displaystyle g/cm^{3} $ ) will:

  1. sink

  2. float

  3. neither float nor sink i.e. remain suspended in mercury

  4. none of these

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

The average density of the object should be less than the density of the fluid in which the object has to float.


The density of object (iron) is less than the fluid (mercury).

Therefore, it will float.


Hence, option B is correct.

Multiple choice evs nature of things properties of materials grouping and classification of objects sorting materials into groups

Opaque objects:

  1. does not transmit most of the light falling on them

  2. transmit most of the light falling on them

  3. absorb most of the light falling on them

  4. are strong and hard

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

An opaque object is neither transparent (allowing all light to pass through) nor translucent (allowing some light to pass through). When light strikes an interface between two substances, in general, some may be reflected, some absorbed, some scattered, and the rest transmitted. 

Multiple choice evs nature of things properties of materials grouping and classification of objects sorting materials into groups

Transparent substances:

  1. absorb all the light incident on them.

  2. allow light to pass through them.

  3. do not allow light to pass through them.

  4. allow light to pass through them only partially.

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

Transparent substances allows the light to pass through them. Due to this it is possible to see through the transparent substances. 

Example: We are able to see through the some glasses because they are transparent.