Chemistry · Science General

States of Matter

2,682 Questions

States of matter questions explore physical changes, evaporation, phase transitions, and the properties of liquids and gases. Topics cover density, cryosurgery, heavy water, and electrolytes. This foundational chemistry topic frequently appears in general science sections of SSC and railway exams.

Phase change mechanismsEvaporation and temperature effectsProperties of liquidsPhysical versus chemical changesElectrolytes and heavy water

States of Matter Questions

Multiple choice physics upthrust in fluids, archimedes' principle and floatation applications of floatation principle of floatation and its applications when do objects float on water?

 An ice cube is floating on the surface of water. How will the water level be affected by melting of this ice cube?

  1. Water level will be raised

  2. Water level will go down

  3. Water level will remain the same

  4. Water level will first rise up then it will go down
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Archimedes' principle states that a floating object displaces its own weight in fluid. When ice melts, the mass of the resulting water is equal to the mass of the ice, so the volume of water produced is exactly equal to the volume of water displaced by the ice. Thus, the level remains the same.

Multiple choice physics upthrust in fluids, archimedes' principle and floatation applications of floatation principle of floatation and its applications when do objects float on water?

lce pieces are floating in a beaker  $A$  containing water and also in a beaker  $B$  containing miscible liquid of specific gravity  $1.2 .$  When ice melts, the level of

  1. Water increases in $A$
  2. Water decreases in $A$
  3. Liquid in $B$ decreases
  4. Liquid in $B$ increases
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When ice melts in water, the level remains unchanged because the weight of the displaced water equals the weight of the ice. In a liquid with specific gravity > 1, the ice displaces a smaller volume of liquid than its own melted volume, so the level decreases.

Multiple choice physics upthrust in fluids, archimedes' principle and floatation applications of floatation principle of floatation and its applications when do objects float on water?

Statement I:- An ice ball is floating in water. Some stone pieces are embedded inside the ice. When ice will melt level of water will fall.
Statement I:- In floating condition,stone pieces will displace more liquid compared to the condition when they sink.

  1. Statement I is true,statement II is true and statement II is a correct explanation for statement I.

  2. Statement I is true,statement II is true and statement II is NOT the correct explanation for statement I.

  3. Statement I is true,Statement II is false.

  4. Statement I is false,Statement II is true.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When ice with embedded stones melts, the stones sink. While floating, the stones displace liquid equal to their weight (due to the ice). Once they sink, they only displace their own volume, which is less than the volume of liquid required to support their weight.

Multiple choice physics upthrust in fluids, archimedes' principle and floatation applications of floatation principle of floatation and its applications when do objects float on water?

A block of wood is so loaded that it just floats in water at room temperature. What change will occur in the state of floatation, if water is heated? 

  1. Floats with some part above water

  2. Just floats

  3. Sinks

  4. Floats completely above water
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sinks.
On heating, the density of water decreases. So, upthrust on block decreases and weight of block exceeds upthrust due to which it sinks.

Multiple choice physics upthrust in fluids, archimedes' principle and floatation applications of floatation principle of floatation and its applications when do objects float on water?

A block of wood is so loaded that it just floats in water at room temperature. What change will occur in the state of floatation, if some salt is added to water?

  1. Floats with some part outside water

  2. Just floats

  3. Sinks in the water

  4. Floats completely above water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Floats with some part outside water. 
On adding some salt to water, the density of water increases, so upthrust on block of wood increases and hence the block rises up till the weight of salty water displaced by the submerged part of block becomes equal to the weight of block.

Multiple choice physics upthrust in fluids, archimedes' principle and floatation applications of floatation principle of floatation and its applications when do objects float on water?

A piece of ice is floating in a concentrated solution of common salt (in water) in a pot. When ice melts completely, the level of solution will 

  1. Go up

  2. Remain the same

  3. Go down

  4. First go up then go down
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$\rho _{salt water0}>\rho _{ice}$

When ice floats, volume of ice in the salt water is given by
$V _{imm}\rho _{salt water}g=V _{ice}\rho _{ice}g$
$\implies V _{imm}=V _{ice}\dfrac{\rho _{water}}{\rho _{salt water}}<V _{ice}$

Hence when ice melts, whole of the volume would add to water and level of solution would rise.

Multiple choice physics upthrust in fluids, archimedes' principle and floatation applications of floatation principle of floatation and its applications when do objects float on water?

An ice cube is floating in a glass of water. What happens to the water level when the ice melts?

  1. Rises

  2. Falls

  3. Remains the same

  4. First rises and then falls
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

according to the Archimedes principle , the floating substance displaces some liquid, so when the ice melts ,there will be no change in the water level as the melted ice will occupy the same volume as it was occupying earlier.

Multiple choice physics upthrust in fluids, archimedes' principle and floatation applications of floatation principle of floatation and its applications when do objects float on water?

An ice cube contains a glass ball. The cube is floating on the surface of water contained in a trough on the surface of water contained in a trough. What will happen to the water level, when the cube melts?

  1. It will remain unchanged

  2. It will fall

  3. It will rise

  4. First it will fall and then rise
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When the cube melts, the water level will remain the same.An floating object displaces an amount of water equal to its own weight. Since, water expands when it freezes, one ounce of frozen water has a larger volume than one ounce of liquid water.

Multiple choice physics upthrust in fluids, archimedes' principle and floatation applications of floatation principle of floatation and its applications when do objects float on water?

An ice cube contains a large air bubble. The cube is floating on the surface of water contained on a trough. What will happen to the water level, when the cube melts?

  1. $It\ will\ remain\ unchanged$
  2. $It\ will\ fall$
  3. $It\ will\ rise$
  4. $First\ it\ will\ and\ then\ rise$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Since density of a hollow ice cube is less than water. Hence it will float and when ice melts, then level of water decreases due to loss in volume.

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

What happens during carbonisation?

  1. Conversion of organic substance to carbon

  2. Conversion to carbon dioxide

  3. Conversion of carbon to diamond

  4. Conversion of carbon to water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

During carbonisation an organic substance converts into carbon or a carbon-containing residue through pyrolysis or destructive distillation. 

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

Which among the given examples, is not used as oxygenates?

  1. MEG

  2. Ethanal

  3. MTBE

  4. TAME
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • Oxygenates are the chemical compounds containing oxygen.
  • They are usually employed as gasoline additives.
  • Commonly used oxygenates are alcohols or ethers.
  • Here, ethanal, MTBE and TAME are ethers. Thus, MEG (Mono ethylene glycol) is not used as oxygenates.   

Multiple choice

The water droplets that condense on the side of a glass occur because of ___________.

  1. a warm drink meeting hot air

  2. a cool drink meeting warmer air

  3. evaporation of the liquid in the glass

  4. sublimation of the ice
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Condensation occurs when water vapor in the air comes into contact with a cooler surface. The cool glass cools the surrounding air, reducing its ability to hold water vapor, causing it to condense into liquid droplets.

Multiple choice

So why do you think density decreasing causes it to rise?

  1. the matter gets cooler

  2. the matter gets lighter

  3. the matter gets heavier

  4. the matter condenses
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When matter is heated, it expands and becomes less dense. Because it is less dense than the surrounding cooler matter, it becomes more buoyant and rises.