Tag: objects that float or sink

Questions Related to objects that float or sink

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

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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

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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

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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

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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

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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

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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} $

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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.