Tag: nature of things

Quizzes (10) Questions (75)

Questions Related to nature of things

Multiple choice evs nature of things objects that float or sink substances that sink or float soluble and insoluble substances

Which of the following type of bodies form sharp shadows when placed in the path of light?

  1. Transparent

  2. Translucent

  3. Transparent and translucent

  4. Opaque
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Transport bodies allow light to pass through it while translucent bodies allow light partially through it but opaque bodies do not allow light to pass through it, so they form sharp shadows when placed in the path of light.

Option (D) is correct.

Multiple choice evs nature of things objects that float or sink substances that sink or float soluble and insoluble substances

Which of the following type of bodies form sharp shadows when placed in the path of light?

  1. Transparent

  2. Translucent

  3. Both A and B

  4. Opaque
Reveal answer Fill a bubble to check yourself
D 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. 

Opaque object forms sharp shadow when placed in the path of the light.

Hence, option D is correct.
Multiple choice evs sorting materials into groups properties of materials grouping and classification of objects nature of things

Kerosene floats on water because :

  1. kerosene has more density

  2. kerosene has less energy

  3. densities of water and kerosene are equal

  4. water has more density
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Water is denser than kerosene. The density of water is $1000kg/m^3$ and kerosene is $810kg/m^3$

when something is less dense than the water then it floats on water. Thus kerosene floats on water.

Option D is correct.

Multiple choice chemistry grouping of materials properties of materials grouping and classification of objects nature of things

During the formation of rain, when water vapour changes back to liquid in the form of rain drops:

  1. Heat is absorbed

  2. Heat is released

  3. Heat is first absorbed and then released

  4. There is no exchange of heat
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The energy contained in the gaseous form (vapour) is more than the energy contained in the liquid form (water). Therefore when vapour changes to water it loses some heat.