Science Question Answer (1 Marks)

What is the physical state of water:
at 0°C?

The boiling point of alcohol is 78°C. What is this temperature on Kelvin scale?

When a crystal of copper sulphate is placed at the bottom of a beaker containing water, the water slowly turns blue. Why?

Name one property which is shown by ammonium chloride but not by sodium chloride.

When sugar is dissolved in water, there is no increase in the volume. Which characteristic of matter is illustrated by this observation?

A piece of chalk can be broken into small particles by hammering but a piece of iron cannot be broken into small particles by hammering. Which characteristic of the particles of matter is illustrated by these observations?

Which single term is used to describe the mixing of copper sulphate and water kept in a beaker, on its own?

Name one property of liquids and gases which tells us that their molecules are moving constantly.

What is the mane of the process in which:
A solid turns directly into a gas?

Out of solids, liquids and gases, which one has:
Minimum spaces between particles?

Name two gases which are supplied in compressed form in homes and hospitals.

Even two or three crystals of potassium permanganate can impart colour to a very large volume of water. Which characteristic of particles of matter is illustrated by this observation?

What is the physical state of water:
at 25°C?

‘A substance has a definite shape as well as a definite volume’. Which physical state is represented by this statement?

Define matter. Give four examples of matter.

In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?

Convert the temperature of 373°C to the Kelvin scale.

The Kelvin temperature is 270K. What is the corresponding Celsius scale temperature?

State one condition necessary to liquefy gases (other than applying high pressure).

Name the process by which a drop of ink spreads in a beaker of water.

What should be added to a Celsius scale reading so as to obtain the corresponding Kelvin scale reading?

Explain why, when a bottle of perfume is opened in a room, we can smell it even from a considerable distance.

What is the common name of solid carbon dioxide?

A substance has neither a fixed shape nor a fixed volume. State whether it is a solid, a liquid or a gas.

What are the characteristics of matter?

Out of solids, liquids and gases, which one has:
Maximum interparticle attractions?

Define the following terms:
Condensation

What are the two ways in which the physical states of matter can be changed?

Name two processes which provide the best evidence for the motion of particles in matter.

Arrange the following substances in increasing order of force of attraction between their particles (keeping the substance having them in imum force of attraction first):
Water, Sugar, Oxygen

What is the general name of:
Fluid forms of matter?

Under what conditions heat can be given to a substance without raising its temperature?

What is meant by saying that the latent heat of fusion of ice is 3.34 × 105J/ kg?

Out of solids, liquids and gases, which one has:
Maximum movement of particles?

Give one example of diffusion of gases in a liquid.

What is the name of the process due to which dry ice changes into carbon dioxide gas?

Explain why, the diffusion of a solid in another solid.

Bromine particles are almost twice as heavy as chlorine particles. Which gas will diffuse faster; bromine (vapour) or chorine? Explain your answer.

What is the scientific name of particles which make up matter?

When a crystal of potassium permanganate is placed in a beaker, its purple colour spreads throughout the water. What does this observation tell us about the nature of potassium permanganate and water?

Define the following terms:
Melting

Write the full forms of the following:
LPG

Explain how, the smell of food being cooked in the kitchen reaches us even from a considerable distance.

Why is solid carbon dioxide known as dry ice?

What is the mane of the process in which:
A gas turns directly into a solid?

Define the following terms:
Freezing

Name the temperature at which:
A solid changes into a liquid.

What is the:
Common unit of temperature.

The Kelvin scale temperature is 0K. What is the corresponding Celsius scale temperature?

Name the temperature at which:
A liquid changes into a gas.

If the fish is being fried in a neighbouring home, we can smell it sitting in our own home. Name the process which brings this smell to us.

What is the:
SI unit of temperature?

What is the physical state of water:
at 100°C?

Which of the two diffuses faster: a liquid or a gas?

Convert the temperature of 573K to the Celsius scale.

Explain why:
Steel is used to make railway lines.

Which of the two diffuses slower: bromine vapour into air or copper sulphate into water?

When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance spreads in the whole room quickly. Which characteristic of the particles of matter is illustrated by this observation?

What are the conditions for 'something' to be called matter?

A bottle of perfume was opened in a room. The smell of its vapours spread in the entire room. Name the property of gases which is responsible for this behavior of perfume vapours.

Explain why:
Air is used to inflate tyres.

Give the usual mane of the following:
Heat required to change the state of a substance without changing the temperature.

Why do gases diffuse very fast?

Define the following terms:
Boiling

Write the relation between Kelvin scale and Celsius scale of temperature.

Name the physical state of matter which can be easily compressed.

A girl is cooking some food in the kitchen. The smell of food being cooked soon reaches her brother’s room. Explain how the smell could have reached her brother’s room.

‘A substance has a definite volume but no definite shape’. State whether this substance is a solid, a liquid or a gas.

When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance quickly spreads in the entire room. Name the process involved in this.

What is the physical state of water:
at 250°C?

Write the full forms of the following:
CNG

What do you understand by the term ‘latent heat’? What are the two types of latent heat?

What is the general name of:
Rigid form of matter?

Name one common substance which can be easily changed from one state to another by heating or cooling.

The boiling point of water is 100°C. Express this in SI units (Kelvinscale).