Tag: nature of things

Questions Related to nature of things

How many of the following are soluble in water?
salt, sugar, sand, dust

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

  1. 1

  2. 2

  3. 3

  4. 4

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Correct Option: B

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

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

  1. Transparent

  2. Translucent

  3. Transparent and translucent

  4. Opaque

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Correct Option: D
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.

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

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

  1. Transparent

  2. Translucent

  3. Both A and B

  4. Opaque

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Correct Option: D
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.

Select the objects which are opaque: 

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

  1. water, oil and soil

  2. soil, sand and dust

  3. glass, grass and gum

  4. marvel, oiled paper and magnet

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Correct Option: B
Explanation:

Opaque objects are materials which do not allow light to pass through them.

Examples are- Soil, sand and dust.

Milk and water dissolve in each other. They are:

chemistry sorting materials into groups properties of materials grouping and classification of objects nature of things

  1. immiscible liquids

  2. solvent and solutions

  3. miscible liquids

  4. None of the above

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Correct Option: C
Explanation:

The two liquid which can dissolve in each other and make a homogenous mixture is called miscible liquid.

Milk and water are miscible liquids.

Option (C) is correct.

Kerosene floats on water because :

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

  1. kerosene has more density

  2. kerosene has less energy

  3. densities of water and kerosene are equal

  4. water has more density

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Correct Option: D
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.

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

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

  1. Heat is absorbed

  2. Heat is released

  3. Heat is first absorbed and then released

  4. There is no exchange of heat

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Correct Option: B
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.

Pick one material which is completely soluble in water:

chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. oil

  2. sawdust

  3. mud

  4. alum

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Correct Option: D
Explanation:

Alum is a hydrated double salt sometimes used as water purifier is completely soluble in water.

Select a pair of solute and solvent materials to form solution:

chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. Chalk powder and water

  2. Alcohol and water

  3. Milk and oil

  4. Glass and water

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Correct Option: B
Explanation:

In general, organic compounds are insoluble in water. Though alcohol is an organic compound it is soluble in water due to hydrogen bonding. 

Find odd one out on the basis of the solubility of the material.

chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. Sugar

  2. Salt

  3. Chalk

  4. Wood

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Correct Option: D
Explanation:

Wood is not at all soluble in water whereas sugar and salt are soluble and chalk $(CaCO _3)$ is slightly soluble in water.