15 Questions MCQ Test Science Class 9 - Test: States Of Matter
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According to the kinetic theory of gases, in an ideal gas, between two successive collisions a gas molecule travels
Detailed Solution for Test: States Of Matter - Question 1
According to kinetic theory og the gas molecule are in a state of constant rapid motion in all possible direction colloiding in a radom manner with one another and with the wall of the container and b/w two successive collisions molecules travel in a straight line path but show haphozard motion due to collisions.
Detailed Solution for Test: States Of Matter - Question 2
Fluidity is the ability of matter of not having a definite shape. Liquids such as water occupy the shape of the container in which they are kept that means they don't have a fix shape so they are called fluids. Gases are also considered fluids.
Conversion of a liquid to a gas at all temperatures is called
Detailed Solution for Test: States Of Matter - Question 4
It is known as boiling. And that temperature known as boiling temperature. When you change a liquid in to gas this process is called vaporization. The process by which a substance gets converted from liquid to gas under low temperature or heating is called evaporation.
Detailed Solution for Test: States Of Matter - Question 6
Layers of particles can slip and slide over each other :
1. Liquid state is the fluid form of matter which can fill the lower part of the container.
2. Particles in liquid have little more inter molecular force than solids.
In liquid state particles have little inter molecular space than solids.
3. Hence,particles in liquid state can vibrate , move about and slide past each other.
Spreading of fragrance of a burning incense stick in a room shows that:
Detailed Solution for Test: States Of Matter - Question 7
When we light an incense stick in one corner of room its fragrance spreads in the whole room because of the process involved DIFFUSION. It is because particles of matter are continuously moving in the air. Its parties vigorously spread and we can smell its fragrance in the whole room.
Name the state of matter which has least compressibility.
Detailed Solution for Test: States Of Matter - Question 8
The least compressible state of matter is solid form.
Solids have much more connected bonds or forces between their own atoms. Since their atoms are more tightly packed together, closer to one another, and are stronger bonds than liquids and gases, then they require more energy (more compression) to change the structure of their atoms.
Why does a gas exert pressure on walls of the container?
Detailed Solution for Test: States Of Matter - Question 9
The molecules are continually colliding with each other and with the walls of the container. When a molecule collides with the wall, they exert small force on the wall The pressure exerted by the gas is due to the sum of all these collision forces.The more particles that hit the walls, the higher the pressure.
Detailed Solution for Test: States Of Matter - Question 10
Humidity means moisture or water particles in the atmosphere. So when the Humidity in the atmosphere increases, the water content of atmosphere also increases. Though there is already water content in atmosphere, the wind speed is slowed down and the wet air can't evaporate in the same way as the evaporation takes place in dry weather.
Why is the rate of diffusion of liquids higher than that of solids?
Detailed Solution for Test: States Of Matter - Question 14
The rate of diffusion in liquids is faster than solids because in liquids molecules have a greater amount of space between them as compared to solids, or we can say they are less tightly packed. also, liquids can flow but solids cannot.
Detailed Solution for Test: States Of Matter - Question 15
Volume of water remains the same when we add sugar to water because water have intermolecular spaces( the vacant space in between the particles of matter) between them in which the particles of sugar takes place.
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