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Objects that float or sink - class-X

Description: objects that float or sink
Number of Questions: 19
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Tags: solids, liquids and gases nature of things experiments with water life giving water grouping of materials materials and things sorting materials into groups chemistry separation of substances the nature of matter evs substances in the surroundings - their states and properties
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Name three materials that are lighter than water:

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

  1. Oil, wood and wax

  2. Iron silver and gold

  3. Sodium, potassium and aluminium

  4. Plastic, glass and wool

Show answer
Correct Option: A
Explanation:

Things which are lighter than water will float on water as oil, wood and wax.

Identify the material from the following which will not sink in water:

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

  1. Knife

  2. Coin

  3. Steel rod

  4. Tennis ball

Show answer
Correct Option: D
Explanation:

Coins, steel rod and knife made from metals are heavier than water hence sinks in water. A tennis ball is lighter than water hence float in water.

The ______ sinks in water while the _______ floats.

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

  1. ship, boat

  2. paper, paper boat

  3. soap cake, soap case

  4. nail, hammer

Show answer
Correct Option: C
Explanation:

The soap cake sinks in water and the soap case floats because the soap cake is solid and doesn't have empty spaces so to float in water whereas soap case which have empty space in which soap settles that space is filled with air and air which is less denser than water helps the case to floats .

Find the odd one out on the basis of its density to that of water.

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

  1. Human body

  2. Plastic Bottle

  3. Glass

  4. Ice

Show answer
Correct Option: C
Explanation:

Human body, plastic bottle and ice having low density than water can float on water whereas glass being denser than water hence sinks.

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

Show answer
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

Show answer
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

Show answer
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

Show answer
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

Show answer
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.

Name two transparent materials. 

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

  1. Glass and wood

  2. Plastic and cold wax

  3. Plastic and glass

  4. Water and honey

Show answer
Correct Option: C
Explanation:

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

Example- Plastic, Glass.

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

Show answer
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

Show answer
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

Show answer
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

Show answer
Correct Option: B
Explanation:

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

Examples are- Soil, sand and dust.

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