Chemistry · Science General

States of Matter

2,382 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 chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

Which of the following generalizations cannot be made about the phase change of a pure substance from solid to liquid?

  1. It involves a change in potential energy.

  2. It involves no change in temperature.

  3. It involves a change in kinetic energy.

  4. It involves a change in entropy.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When a pure substance undergoes a phase change from solid to liquid state,there will increases in temperature so,the collision rate do not increases which implies that there is no change in kinetic energy,the entire heat involves a change in potential energy.It involves change in entropy because more free particles are generated from solid to liquid.

Multiple choice chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

Statement I: Water droplets form on the outside of a beaker containing an ice bath.
Statement II: Water vapor molecules in the air lose energy when they collide with the cold glass surface and condense.

  1. Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I.

  2. Both Statement I and Statement II are correct, but Statement II is not the correct explanation of Statement I.

  3. Statement I is correct, but Statement II is incorrect.

  4. Statement I is incorrect, but Statement II is correct.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Condensation is a process in which gaseous molecules lose energy and gets converted to liquid state.

Water droplets are formed on outside of a beaker containing ice bath because water molecules in air loose energy when they collide with the cold glass surface  and condense.

Multiple choice physics option b: engineering physics conversion of heat into work: heat engine and it's efficiency engines and cycles refrigerators and heat pumps

Which of the following is true about refrigeration?

  1. Heat is removed from the inside of the refrigerator

  2. Cold air is produced inside the refrigerator

  3. Hot air is removed from the inside of the refrigerator

  4. Hot air is changed to a cold condensate inside the refrigerator

  5. Hot air inside the refrigerator is expanded to remove its heat
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A refrigerator is infact a reverse heat engine which absorbs heat from source (material) at lower temperature, do work on it and then passes the heat to the sink (sorrounding) at higher temperature, thus we can say that heat is removed from inside the refrigerator.

Multiple choice physics option b: engineering physics conversion of heat into work: heat engine and it's efficiency engines and cycles refrigerators and heat pumps

By opening the door of a refrigerator which is inside a room, the temperature of room ____________.

  1. first decreases then increases

  2. remains unchanged

  3. increases

  4. decreases
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When the door of a refrigerator is opened the temperature of the room increases as the room is acting as the source here where the heat is rejected.

Multiple choice physics option b: engineering physics conversion of heat into work: heat engine and it's efficiency engines and cycles refrigerators and heat pumps

A refrigerator is a device which works on the principle that evaporation of a liquid gives a cooling effect.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A refrigerator works on principle of thermodynamics of extracting heat from a body which means making it drop its temprature. There is nothing like cooling a thing its a by product of removing or extracting heat from a material or a body. This is what a refrigerator does. Refirgerator with help of coolant flowing through coolant tubes and condensor does this job of extracting heat from the all items kept in refrigerator.

A refrigerator is a device which works on the principle that evaporation of a liquid gives a cooling effect.
Option A is correct.
Multiple choice botany plant water relation active transport and passive transport types of plant transport atp

Diffusion in gases are _____ than in liquids.

  1. Slower

  2. Faster

  3. Equal

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Diffusion occurs in both liquids and gases and can take place over long distances. Diffusion in gases are much faster than in liquids the diffusion rate of oxygen in air is $1,00,000$ times more than diffusion rate of oxygen in water.

Multiple choice physics thermal physics heat and heat transfer transfer of heat fundamentals of heat transfer

A person takes hot tea by pouring it into the saucer (plate) when one is in a hurry because he knows that

  1. The latent heat of steam is high and the tea will become cold quickly

  2. The evaporation increases with the increase in surface area and cooling of tea is faster

  3. Part of heat will be absorbed by the saucer (plate) and the tea will become cold quickly

  4. The high specific heat of water makes the tea cold quickly
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Evaporation is a surface phenomenon. By pouring tea into a saucer, the surface area exposed to the air increases, which significantly accelerates the rate of evaporation and consequently cools the liquid faster.

Multiple choice physics measurement and effects of heat heat exchange calorimeter measuring thermal quantities by the method of mixtures

A thermos bottle containing coffee is vigorously shaken. If the coffee is considered as a system, then the temperature of the coffee will 

  1. increase slightly

  2. fall

  3. remain the same

  4. never be determined
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A thermoflask is closed system, so no heat energy added to system i.e. $\triangle \theta=0$
Work is done on the system by shaking it against viscous force. Hence $\triangle w=-ve$
Internal energy, $\triangle U=\triangle \theta - \triangle w=0-(-\triangle w) \\ \Rightarrow \triangle U=+\triangle w$
$\because \triangle U\; is\; +ve$ So there is increase in temperature due to rise in internal enrgy.
Multiple choice physics measurement and effects of heat heat exchange calorimeter measuring thermal quantities by the method of mixtures

Heat is added to a block of ice of mass $m$ until the entire block melts into liquid water. Identify by which of the following method this can be explained ?

  1. First law of thermodynamics (conservation of energy)

  2. Second law of thermodynamics (law of entropy)

  3. Ideal gas law

  4. Heat of fusion and heat of vaporization equation

  5. Heat engine efficiency
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When heat is added to ice at $0^{\circ}C$, the temperature of the ice does not change. However the heat goes into the latent heat of fusion of ice, This is a kind of potential energy that water owns in form of latent heat.

Hence correct answer is option D.

Multiple choice chemistry composition of matter heterogeneous mixture - suspension and its properties suspension types of mixture

Suspension is a heterogeneous mixture in which very fine particles of a solid are dispersed in any medium (liquid or gas). Fine particles of the solid remain suspended in the medium.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A suspension is a heterogeneous mixture in which very fine particles of a solid are dispersed in any medium (liquid or gas). Fine particles of the solid remain suspended in the medium.

Following are the characteristics properties of suspensions

i) Heterogeneous nature: a suspension is a heterogeneous system.

ii) Visibility: the particles in a suspension can be seen with naked eyes or under a simple microscope.

iii) Particle Size: in a suspension, the size of the particles is of the order of 10-7 make or larger.

iv) Sedimentation: the particles in a suspension travel tendency to settle down. Very fine particles, however, remain suspended in the medium.

v) Separation by filtration: Larger particles in a suspension can be separated from the liquid or air by the filtration.