Important questions and Answers of Sorting Materials into Groups
1.Fill in the blanks with suitable word/ words.
a. Making orderly arrangement of materials is called - --------------------.
b. Newspaper, a book, a copy, a diary are made up of - ----------------.
c. Substances that can burn easily are called -------- ---------.
d. A substance that allow light to pass is called ---- ---------------.
e. ------------------- gas is highly combustible.
(a) Classification (b) paper (c) combustible (d) tr ansparent (e) Hydrogen.
2.Fill in the blanks
a. All metals are ----------------- of heat and electr icity.
b. Gold is ---------------------.
c. Petrol is ----------------in water.
d. Copper is --------------- magnetic material.
e. Chalk does not --------------- in water.
(a) Conductor (b) ductile (c) insoluble (d) electro (e) dissolve. 3.Short answer questions
1. What are soft and hard materials? Give example.
Ans.The materials which can be compressed or scratched easily are called soft while some other materials which are difficult to compress are called hard. Cotton and sponge are hard and iron and coal are hard materials.
2. On what basis materials are grouped together?
Ans.Materials can be grouped together on the basis of s imilarities or differences in their properties. Classification makes the study of prope rties easier. It can be located easily if grouped in particular manner.
3. What is solubility? Give two example of each solubl e and insoluble in water?
Ans.The ability of solute a to get dissolved in to a so lvent is called solubility. Some common substances soluble in water are sugar and salt. The substance insoluble in water are petrol, chalk etc.
4.Define malleability and ductility?
Ans. The property of matter due to which it can be draw n into thin wire is called ductility. The property of metals due to which it can be beate n into thin sheet is called as malleability.
5.Why do metal’s objects loose their luster after a w hile?
Ans.Metals object loose their luster after some time du e to reaction with oxygen and other gases to form metal oxide. These metal oxide change the colour of the metal surface.
6.How are transparent objects different from opaque o bjects?
Ans.Those objects through which object can be seen but not very clearly are called translucent object. Butter paper, thick sheet of pl astic are example of translucent objects. On the other hand, those objects through w hich light do not pass are called opaque object. Woods, bricks etc. are example of op aque objects.
7.What are miscible and immiscible substances? Give e xample.
Ans.The liquid that mix with water are called miscible and those which do not mix with water are called immiscible substances. Vinegar, l emon juices are miscible and petrol and mustard oil are immiscible substances.
8.Write the expanded form of with uses.
a. CNG
b. LPG
Ans.Expanded form of
a. CNG is Compressed Natural Gas; it is used as clean fuel in motor vehicles.
b. LPG is Liquefied Petroleum Gas; it is used a domest ic fuel for cooking food in kitchen.
9.What is volatility? Name some volatile substance.
Ans.The property of a liquid to get converted into vapo ur is called volatility and substance is called volatile. Some common volatile substances are Ether, Chloroform, Ethyl alcohol and Camphor.
1.Fill in the blanks with suitable word/ words.
a. Making orderly arrangement of materials is called - --------------------.
b. Newspaper, a book, a copy, a diary are made up of - ----------------.
c. Substances that can burn easily are called -------- ---------.
d. A substance that allow light to pass is called ---- ---------------.
e. ------------------- gas is highly combustible.
(a) Classification (b) paper (c) combustible (d) tr ansparent (e) Hydrogen.
2.Fill in the blanks
a. All metals are ----------------- of heat and electr icity.
b. Gold is ---------------------.
c. Petrol is ----------------in water.
d. Copper is --------------- magnetic material.
e. Chalk does not --------------- in water.
(a) Conductor (b) ductile (c) insoluble (d) electro (e) dissolve. 3.Short answer questions
1. What are soft and hard materials? Give example.
Ans.The materials which can be compressed or scratched easily are called soft while some other materials which are difficult to compress are called hard. Cotton and sponge are hard and iron and coal are hard materials.
2. On what basis materials are grouped together?
Ans.Materials can be grouped together on the basis of s imilarities or differences in their properties. Classification makes the study of prope rties easier. It can be located easily if grouped in particular manner.
3. What is solubility? Give two example of each solubl e and insoluble in water?
Ans.The ability of solute a to get dissolved in to a so lvent is called solubility. Some common substances soluble in water are sugar and salt. The substance insoluble in water are petrol, chalk etc.
4.Define malleability and ductility?
Ans. The property of matter due to which it can be draw n into thin wire is called ductility. The property of metals due to which it can be beate n into thin sheet is called as malleability.
5.Why do metal’s objects loose their luster after a w hile?
Ans.Metals object loose their luster after some time du e to reaction with oxygen and other gases to form metal oxide. These metal oxide change the colour of the metal surface.
6.How are transparent objects different from opaque o bjects?
Ans.Those objects through which object can be seen but not very clearly are called translucent object. Butter paper, thick sheet of pl astic are example of translucent objects. On the other hand, those objects through w hich light do not pass are called opaque object. Woods, bricks etc. are example of op aque objects.
7.What are miscible and immiscible substances? Give e xample.
Ans.The liquid that mix with water are called miscible and those which do not mix with water are called immiscible substances. Vinegar, l emon juices are miscible and petrol and mustard oil are immiscible substances.
8.Write the expanded form of with uses.
a. CNG
b. LPG
Ans.Expanded form of
a. CNG is Compressed Natural Gas; it is used as clean fuel in motor vehicles.
b. LPG is Liquefied Petroleum Gas; it is used a domest ic fuel for cooking food in kitchen.
9.What is volatility? Name some volatile substance.
Ans.The property of a liquid to get converted into vapo ur is called volatility and substance is called volatile. Some common volatile substances are Ether, Chloroform, Ethyl alcohol and Camphor.
No comments:
Post a Comment