What can you say about plasma?
I.It is a mixture of free electrons and ions
II. It contains only electrons
III. It can also be artificial
Important Questions on Matter in Our Surroundings
I. Gases have high densities
II. Liquids have high compressibility
III. Solids have the minimum kinetic energy of particles
|
Column I (Physical quantity) |
Column II (SI units) |
| A. Mass | (i) Cubic meter |
| B. Volume | (ii) Pascal |
| C. Pressure | (iii) |
| D. Density | (iv) Kilogram |
Match the following
| Column I | Column II |
| A. Solid | (i) Super energetic particles |
| B. Liquid | (ii) Highly compressible |
| C. Gas | (iii) Definite volume and shape |
| D. Plasma | (iv) Definite volume but no shape |
Match the column:
| Column I | Column II |
| A. Diffusion | (i) Spread of virus on sneezing |
| B. Osmosis | (ii) Adding salt in pickles |
| C. Evaporation | (iii) Keeping water in earthen pots |
| D. Sublimation | (iv) Naphthalene balls disappear |
Read the passage and answer the following question-
Latent Heat
The term latent means hidden. The latent heat of a substance is the amount of heat absorbed by a unit mass of the substance to change its state without a change of temperature. Its SI unit is Joules per kilogram. Latent heat is of two types:
1. Latent heat of fusion.
2. Latent heat of vaporization.
The Latent heat of fusion of a solid is the quantity of heat in Joules required to convert 1 KG of solid (at its melting point) to liquid, with no change in temperature.
The Latent heat of vaporization of a liquid is the quantity of heat in Joules required to convert 1 KG of the liquid (at its boiling point) to gas with no change in temperature.
Specific heat
It is the amount of heat that is required to raise the temperature of a unit mass of the substance by 1 °C. The symbol is C or S. The specific heat varies slightly with temperature. This is due to varies slightly with the change which occurs in the structure of molecules in a substance with change in temperature. The unit of specific heat is Joules per kilogram per degree Celsius
Read the passage and answer the following question-
Latent Heat
The term latent means hidden. The latent heat of a substance is the amount of heat absorbed by a unit mass of the substance to change its state without a change of temperature. Its SI unit is Joules per kilogram. Latent heat is of two types:
1. Latent heat of fusion.
2. Latent heat of vaporization.
The Latent heat of fusion of a solid is the quantity of heat in Joules required to convert 1 KG of solid (at its melting point) to liquid, with no change in temperature.
The Latent heat of vaporization of a liquid is the quantity of heat in Joules required to convert 1 KG of the liquid (at its boiling point) to gas with no change in temperature.
Specific heat
It is the amount of heat that is required to raise the temperature of a unit mass of the substance by 1 °C. The symbol is C or S. The specific heat varies slightly with temperature. This is due to varies slightly with the change which occurs in the structure of molecules in a substance with change in temperature. The unit of specific heat is Joules per kilogram per degree Celsius
The value of latent heat of vaporization of water in Cal/gm is _____
Read the passage and answer the following question-
Latent Heat
The term latent means hidden. The latent heat of a substance is the amount of heat absorbed by a unit mass of the substance to change its state without a change of temperature. Its SI unit is Joules per kilogram. Latent heat is of two types:
1. Latent heat of fusion.
2. Latent heat of vaporization.
The Latent heat of fusion of a solid is the quantity of heat in Joules required to convert 1 KG of solid (at its melting point) to liquid, with no change in temperature.
The Latent heat of vaporization of a liquid is the quantity of heat in Joules required to convert 1 KG of the liquid (at its boiling point) to gas with no change in temperature.
Specific heat
It is the amount of heat that is required to raise the temperature of a unit mass of the substance by 1 °C. The symbol is C or S. The specific heat varies slightly with temperature. This is due to varies slightly with the change which occurs in the structure of molecules in a substance with change in temperature. The unit of specific heat is Joules per kilogram per degree Celsius
Identify which conversion will require a larger amount of energy?
(i) 1kg of ice at 0 °C to 1kg of water at 0 °C.
(ii) 1kg of water at 100 °C to 1kg of steam at 100 °C
