Tag: evs

Questions Related to evs

Which of the following sinks in water?

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

  1. A boat

  2. A piece of paper

  3. A nail

  4. A stick

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Correct Option: C
Explanation:

A nail can sinks in water as it is denser and does not have space in it.


Boat and stick are made up of wood and its density is less than water and has spaces between the molecules and paper is also less dense than water so does not sink in water.

Ayesha saw that the first puri ____________ to the bottom of the pan; as it puffed up, it started ____________ on the oil.

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

  1. float, to sank

  2. sank, floating

  3. reached, floating

  4. none of these

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Correct Option: B
Explanation:

At first the density of puri is higher than oil so it sinks and then after puri gets filled with air (the air being lighter than oil) which makes to float in oil.

When cyclohexane is poured in water, it floats because :

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

  1. cyclohexane is in boat form

  2. cyclohexane is less denser than water

  3. cyclohexane is in chair form

  4. cyclohexane is in crown form

Show answer
Correct Option: B
Explanation:

The density of cyclohexane (0.77 g/ml) is lesser than that of water (1 g/ml).


Hence, it floats over water.

The density of brass on CGS system is 8.4 $ \displaystyle g/cm^{3} $. Its density in SI system is:

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

  1. 8.4 $ \displaystyle kg/m^{3} $

  2. 84 $ \displaystyle kg/m^{3} $

  3. 840 $ \displaystyle kg/m^{3} $

  4. 8400 $ \displaystyle kg/m^{3} $

Show answer
Correct Option: D
Explanation:

SI Unit of density is $ Kg/m^3 $.

So, $8.4  g/cm^3 $ = $8.4 \times 1000 = 8400  kg/m^3 $.
Option D.

The following is the characteristic property of a substance:

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

  1. density

  2. volume

  3. weight

  4. none of these

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Correct Option: A
Explanation:

Density is a characteristic property because it does not change with the varying amount of the substance. No matter how big or small a piece of the substance you have, it will always be the same density because it is the same material.

Take 2 glasses $A $ and $B$ and put tap water in $A$ and salt water in $B$. Now add 1 egg in each. In which of the glass, an egg will sink?

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

  1. $A$

  2. $B$

  3. Both

  4. None of them

Show answer
Correct Option: A
Explanation:

Salt water is denser than fresh water. So, if we put egg in salt water the egg floats and if we put egg in tap water the egg will sink.

What are transparent materials?

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

  1. The material which does not allow light to pass through it.

  2. The material which allows light to pass through it.

  3. The material through which light can pass partially.

  4. None of these.

Show answer
Correct Option: B
Explanation:

Materials which allow light to completely pass through them without getting scattered are called Transparent material.

Example- a glass of water, clear eyeglasses.

What do you call a substance through which things are partially visible?

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

  1. Opaque object

  2. Transparent object

  3. Lustrous object

  4. Translucent object

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Correct Option: D
Explanation:

The material which does not allow light to pass through it is called opaque and material which allows light to pass through it is called transparent. The material through which light can pass partially is called translucent, e.g. butter paper.

Which of the following substance is not transparent?

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

  1. Glass

  2. Pure Water

  3. Air

  4. Steel

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Correct Option: D
Explanation:

Transparent material:- Materials which allow light to completely pass through them without getting scattered are called Transparent material.

Example- a glass of water, clear metal-containing.
Steel does not allow to pass light through it hence is an opaque object.

Translucent substances  __________.

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

  1. allow the light to pass through it completely

  2. allow the light to pass through it partially

  3. does not allow the light to pass through it

  4. none of these

Show answer
Correct Option: B
Explanation:

Those materials that allow some light to pass through them are called translucent and include things like frosted glass and wax paper.