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WorksheetsPhysics Class 8th Ch-1
Total questions: 25
Worksheet time: 15mins
Examples for latent heat of fusion ( there could be more than 1 correct answers)
The specific latent heat of fusion of ice is 336 kJ/kg
True
False
During a change in state of matter, the amount of heat energy absorbed causes a change in temperature
True
False
Soft drinks are cooled faster by placing them in ice rather than in water at 0oC.
True
False
A burn caused by boiling water is more serious than a burn caused by steam.
True
False
Icebergs do not melt due to
High latent heat of vaporisation of ice
Low latent heat of Fusion of ice
High latent heat of Fusion of ice
Low latent heat of vaporisation of ice
During the change of state, the temperature
increases
decreases
remains constant
first increases and then decreases
The fixed temperature at which a liquid changes into its solid state is called its
melting point
freezing point
boiling point
condensation point
On rejecting heat from a substance, the kinetic energy of its molecules.
Increases
Decreases
remains same
none of the above
The boiling point of seawater is 100.8 degree celsius. Its condensation point will
decrease
increase
first increase then decrease
remain same
Identify the process.
Melting
Freezing
Boiling
Condensation
You have a chocolate bar with you. You forgot to keep it in the fridge and saw that the chocolate has melted. Which of the following property will be the same in the molten chocolate and the chocolate bar?
Shape
Compressibility
Hardness
Mass
Which of the following is most likely to occur when a solid is heated?
both intermolecular space and intermolecular force will increase
both intermolecular space and intermolecular force will decrease
intermolecular space increases while intermolecular force decreases
intermolecular space decreases while intermolecular force increases
A substance has a boiling point of 90 degree celsius. What changes occur when it is heated from 50 degree celsius to 120 degree celsius?
the energy of particles increases; attractive forces increase
the energy of particles increases; attractive forces decrease
the energy of particles decrease; attractive forces decrease
the energy of particles decrease; attractive forces increase
The three states of matter are represented by diagrams X, Y, and Z. Which change occurs during condensation?
X to Y
Y to X
X to Z
Z to X
When a liquid becomes a solid, what are the changes in the behaviour of the particles? select all that apply
particles lose energy
particles are unable to overcome forces of attraction
particles move closer together
particles become smaller
what would cause a decrease in molecular movement?
decrease in atoms
increase in space between the atoms
decrease in temperature
increase in temperature
All phase changes require energy to be added or taken away.
True
False
Seema took a 100 ml beaker and filled half the beaker with water and marked the level of water. She dissolved some salt with the help of a glass rod and recorded water level again.
The water level increases appreciably
The water level decreases
The water level remains the same
There is little increase in water level.
Which of the following is correct order of forces of attraction?
Water > Air > Sand
Air > Sugar > Oil
Air < Water < Sugar
Salt > Air > Juice
Choose the correct statement out of the following
Conversion of solid into vapours without becoming liquid is called evaporation.
Conversion of vapours into solid without becoming liquid is called sublimation
Conversion of solid into liquid is called sublimation.
Conversion of liquid into vapours is called fusion.
Which of the following will produce severe burns ?
Cold water
Hot water
Boiling water
Steam
Which of the following is incorrect?
Solids have fixed shape and fixed volume.
Liquids have fixed volume but not shape
Gases have neither fixed shape nor volume
The particles have least intermolecular space but maximum kinetic energy in liquids.
Ice floats on water because
it has higher density than water
it has lower density than water due to more volume
it is solid
it is low melting solid
Latent heat of fusion is amount of
heat energy required to change 1 kg solid into liquid completely at its melting point.
heat energy required to convert 1 kg solid into liquid at room temperature
heat energy required to change 1 g of solid into liquid completely
heat energy required to change 1 kg of solid into liquid at any temperature.
