Every question from this NCERT chapter, with a detailed explanation.
What causes the formation of water droplets on the outer surface of a glass containing ice-cold water?
Consider the following statements: 1. Matter is defined as anything that has mass but does not occupy space. 2. The smell of perfume is matter, but the feeling of love is not. 3. Air is not considered matter because it cannot be seen. Which of the statements given above is/are correct?
With reference to the process of 'diffusion', consider the following statements: 1. Diffusion requires external mechanical force to intermix particles. 2. The rate of diffusion increases with an increase in temperature. 3. Solids and liquids can diffuse into liquids. Which of the statements given above is/are correct?
Consider the following statements regarding the forces of attraction between particles of matter: 1. The force of attraction is strongest in gases and weakest in solids. 2. This force keeps the particles together. 3. The strength of this force is identical for all kinds of matter. Which of the statements given above is/are correct?
The spontaneous spreading of potassium permanganate colour in water without stirring primarily demonstrates which property of matter?
Consider the following statements regarding the dissolution of salt in water: 1. The mass of the solution increases when salt is dissolved. 2. Salt particles remain on the surface of water particles without mixing. 3. This process proves that matter is particulate in nature. Which of the statements given above is/are correct?
Which one of the following sequences represents the increasing order of the force of attraction between the particles of matter?
With reference to the diffusion of gases in liquids, consider the following statements: 1. Gases from the atmosphere cannot diffuse into water. 2. Dissolved oxygen in water is essential for the survival of aquatic animals. 3. The rate of diffusion of gases into liquids is higher than that of solids into liquids. Which of the statements given above is/are correct?
Consider the following statements regarding the solid state of matter: 1. Solids have a tendency to maintain their shape when subjected to outside force. 2. Solids are highly compressible and lack rigidity. 3. A rubber band is considered a liquid because it changes shape. Which of the statements given above is/are correct?
Why is a sponge considered a solid substance despite its high compressibility?
With reference to the liquid state, consider the following statements: 1. Liquids have a fixed volume but not a fixed shape. 2. Liquids are rigid and cannot flow. 3. The rate of diffusion of liquids is higher than that of solids. Which of the statements given above is/are correct?
What is the primary cause of the pressure exerted by a gas on the walls of its container?
Consider the following statements regarding the gaseous state: 1. Gases are incompressible compared to solids. 2. In the gaseous state, particles move randomly at high speed. 3. The spaces between particles are maximum in gases. Which of the statements given above is/are correct?
Why does the aroma of hot cooked food spread faster than that of cold food?
Consider the following statements about Liquefied Petroleum Gas (LPG) and Compressed Natural Gas (CNG): 1. They utilize the property of high compressibility of gases. 2. Only small volumes of gas can be stored in cylinders due to low compressibility. 3. Compressing these gases increases their particle size significantly. Which of the statements given above is/are correct?
Which one of the following statements is incorrect regarding the characteristics of particles in different states of matter?
With reference to density, consider the following statements: 1. Density is defined as mass per unit volume. 2. Liquids generally have a higher density than solids. 3. Ice floats on water because it has a lower density than liquid water. Which of the statements given above is/are correct?
Consider the following statements regarding the melting of a solid: 1. The temperature at which a solid melts is called its boiling point. 2. The melting point is an indication of the strength of the force of attraction between particles. 3. During the melting process, the temperature of the system remains constant. Which of the statements given above is/are correct?
During the phase change from solid to liquid at the melting point, how is the supplied heat energy utilized?
The term "Latent Heat of Fusion" refers to:
What is the reason that water at 0°C possesses more energy than ice at the same temperature?
Consider the following statements regarding the boiling of a liquid: 1. Boiling is a surface phenomenon. 2. The temperature at which a liquid starts boiling at atmospheric pressure is known as its boiling point. 3. Particles only from the surface gain energy to change into vapour. Which of the statements given above is/are correct?
Which one of the following substances causes more severe burns at 100°C?
With reference to the Kelvin and Celsius scales of temperature, consider the following statements: 1. Kelvin is the SI unit of temperature. 2. To convert a temperature from Celsius to Kelvin, one must subtract 273 from the given temperature. 3. 0°C is equivalent to 273.15 K. Which of the statements given above is/are correct?
Consider the following statements about Sublimation: 1. It is the change of gaseous state directly to liquid state. 2. Camphor and Ammonium chloride undergo sublimation. 3. The direct change of gas to solid is called Deposition. Which of the statements given above is/are correct?
Consider the following everyday phenomena: 1. Water kept in an earthen pot becomes cool during summer. 2. We feel cooler on a humid day due to faster evaporation. 3. Acetone poured on the palm causes a heating sensation. Which of the above are consequences of evaporation causing cooling?
What is the scientific reason for recommending cotton clothing during summer?
Consider the following statements regarding the characteristics of particles of matter: 1. Particles of matter attract each other. 2. Particles of matter are completely stationary in solids. 3. Particles of matter have spaces between them. Which of the statements given above is/are correct?
During the phase change of a substance, the temperature remains constant despite the continuous supply of heat. What is the primary reason for this phenomenon?
With reference to the compressibility of matter, consider the following statements: 1. Solids are highly compressible. 2. Liquids are less compressible than gases. 3. Gases are highly compressible. Which of the statements given above is/are correct?
Consider the following statements regarding the effect of heat on diffusion: 1. Heating a liquid decreases the rate of diffusion of solid particles into it. 2. Heating increases the kinetic energy of particles. 3. Diffusion becomes faster as temperature rises. Which of the statements given above is/are correct?
With reference to the physical nature of matter, consider the following statements: 1. Matter is continuous in nature, similar to a block of wood. 2. The particles of matter have spaces between them. 3. The particles of matter are stationary and do not move. Which of the statements given above is/are correct?
Consider the following statements regarding the kinetic energy of particles in matter: 1. Particles of matter possess maximum kinetic energy in the gaseous state. 2. As the temperature rises, the kinetic energy of particles decreases. 3. In solids, particles have minimum kinetic energy compared to liquids and gases. Which of the statements given above is/are correct?
Which one of the following substances undergoes the process of sublimation upon heating?
Match List I with List II and select the correct answer using the code given below: List I | List II A. Fusion | 1. Solid to Gas B. Vaporisation | 2. Solid to Liquid C. Sublimation | 3. Liquid to Gas D. Deposition | 4. Gas to Solid
Consider the following statements regarding the effect of pressure on the states of matter: 1. Increasing pressure and reducing temperature can liquefy gases. 2. Solid Carbon Dioxide is stored under low pressure. 3. Solid Carbon Dioxide converts to liquid when pressure is decreased to 1 atmosphere. Which of the statements given above is/are correct?
What is the reason for referring to solid carbon dioxide as 'dry ice'?
Under which of the following conditions can a gas be most easily liquefied?
The unit 'atmosphere' (atm) is primarily used to measure which physical quantity?
Consider the following statements regarding the interconversion of states: 1. Temperature determines the state of a substance. 2. Water can exist only in liquid state at standard atmospheric pressure. 3. The conversion of liquid to solid is called solidification. Which of the statements given above is/are correct?
With reference to evaporation, consider the following statements: 1. It is a bulk phenomenon. 2. It takes place at temperatures below the boiling point. 3. During evaporation, particles at the surface gain energy from the surroundings to break away from forces of attraction. Which of the statements given above is/are correct?
Which one of the following factors retards the rate of evaporation of a liquid?
What is the mechanism by which evaporation causes a cooling effect?
Consider the following statements regarding the effect of wind speed on evaporation: 1. Clothes dry faster on a windy day. 2. With the increase in wind speed, particles of water vapour accumulate near the surface. 3. Increased wind speed decreases the amount of water vapour in the immediate surroundings. Which of the statements given above is/are correct?
Why is a desert cooler more effective on a hot, dry day compared to a humid day?
Consider the following statements about humidity: 1. Humidity is defined as the amount of liquid water suspended in air. 2. Air has a definite capacity to hold water vapour at a given temperature. 3. If the amount of water in air is high, the rate of evaporation decreases. Which of the statements given above is/are correct?
In which of the following scenarios will the rate of evaporation be the highest?
Which of the following pairs is correctly matched regarding the unit of pressure?
The rapid spreading of the smell of perfume in a room is primarily attributed to which one of the following phenomena?
Consider the following statements regarding the arrangement of particles: 1. In solids, particles are arranged in a highly ordered manner. 2. In liquids, particles are fixed in position and cannot move. 3. In gases, particles are arranged in a regular pattern. Which of the statements given above is/are correct?
Which of the following properties primarily determines that a substance, such as iron, exists as a solid at room temperature?
With reference to the conversion of states, consider the following statements: 1. Fusion is the process of changing solid into liquid. 2. Solidification is the process of changing solid into gas. 3. Vaporisation is the process of changing liquid into gas. Which of the statements given above is/are correct?
The term 'Dry Ice', often used as a refrigerant, refers to:
Consider the following statements regarding the evaporation of water: 1. It occurs only when water reaches 100°C. 2. It causes cooling of the surroundings. 3. It becomes slower if the surface area is increased. Which of the statements given above is/are correct?
Which physical principle explains the cooling of a hot liquid when poured into a saucer?
Consider the following statements regarding the properties of matter: 1. Matter is particulate in nature. 2. The particles of matter are static. 3. The particles of matter attract each other. Which of the statements given above is/are correct?
Consider the following statements regarding the "Melting Point": 1. It is the temperature at which a solid becomes a liquid at atmospheric pressure. 2. A higher melting point indicates weaker forces of attraction between particles. 3. The melting point of ice is 273.15 K. Which of the statements given above is/are correct?
In the context of the states of matter, which of the following represents the correct order of particle motion (kinetic energy) from lowest to highest?
Consider the following statements regarding the "Latent Heat of Vaporisation": 1. It is the heat energy released when gas turns into liquid. 2. It results in steam having higher energy than boiling water at the same temperature. 3. It is absorbed without showing any rise in temperature. Which of the statements given above is/are correct?
With reference to the process of evaporation, which one of the following statements is correct?
Consider the following statements regarding the compressibility of gases: 1. It allows large volumes of gas to be transported in small cylinders. 2. It is not applicable to fuels like CNG and LPG. 3. It is due to the absence of spaces between gas particles. Which of the statements given above is/are correct?
In the context of changes of state, the term 'Deposition' refers to: