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Case study 3
1)A push or pull of an object is called force. The SI unit of force is Newton.
2) Contact force : It is the force which acts on only when objects are in physical contract with each other and bring about changes.
Non- contact force : It is the force which can even act when objects are not in physical contract with each other bring about changes.
3) Magnetic force.

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(1)Apush or pull of object
(3) contact force

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Nitesh Attri

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1 ans A push or pull of an object is called force . SI unit – Newton
2 ans contact force are those in which object are in contact with object and bring about changes
Non contact force are those in which object are not in contact with each other and bring about changes
3 ans  magnetic force

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Harsh Agrawal

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Harshita singh

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Case study 2
1)Rusting of iron is the process in which iron like object like iron nails are kept in moist air, they get covered with brownish like substance is called rusting of iron.
2) When iron combines with oxygen and water it forms rust.
3) Copper metal when exposed to air turns green in colour due to corrosion.
4) Silver becomes black because of hydrogen sulphide, a substances that occurs in the air .

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Harsh Agrawal

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1 ans  when an iron object left in damp air for some times and then it covered with brown powdery substance is called rusting of iron.
2 ans chemical nature of rust is basic
3 ans copper become greenish when left in

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Harshita singh

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Harsh Agrawal

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4.The advantage of food preservation is to food longer, reduce waste

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Case study-3
1. The push or pull on an object with mass that causes it to change its velocity. SI unit is Newton.
2.A non-contact force is a force which acts on an object without coming physically in contact with it.
A contact force is any force that requires contact to occur.
3.Non-contact force.

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1. the push or a pull of an object is called force . Newton
2. A force in which an object physically contact with it is called non contact force. a contact force is any force that requires contact to occur.
3. Magnetic force

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Kashish

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4)The advantage of food preservation is to keep food longer,reduce waste.

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anant attri case study 3

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Nitesh Attri
Chemical nature of rust is basiv

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anant attri  case study 1and 2

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Neha
Case study 2
1.The brown powedry substance  came in metal with the presence of water and air is called rusting of iron.
2.iron oxide.
3.copper metal when exposed to air.

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(1)Rusting of iron is process in which a new layer in formed when  water and oxygen meets
(2) iron  oxide
(4) the silver exposed and meet with  oxygen turns black

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3)  Refrigeration,adding chemical

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Harsh chaudhary
1. The process by which the food save for longre time is called presentation.
2. The process of heating up milk to high temperature for short time and then cool it down again it.

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1. The process in which food save for longer time is called food preservations.
2. .pausteurisation is a process in this  method milk boil at high temperature then  cool it.
3. refiregator , adding chemical
4. It keeps us food healthy for long time.
it stops the wastage of food.

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Harsh Agrawal

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3.refrigeration , adding chemical

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Vansh
Case study-2
1. Rusting of iron refers to the formation of rust, a mixture of iron oxides, on the surface of iron objects or structures.
2. Iron oxide
3. Copper metal when exposed to air turns green in colour due to corrosion. When copper vessel is exposed to air in rainy season, the metal reacts with gases and moisture and atmospheric gases to form a mixture of copper carbonate and copper hydroxide.
4. Silver becomes black because of hydrogen sulfide (sulfur), a substance that occurs in the air.

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1)The process in which food save for long period is called food preservation.

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2.Pasteurisation is the process of saving milk

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1.The process by which food can be save in long time is called preservation.
2..the process of heating up milk to a high temperature for a short time and then cooling it down again quickly.
3...vinegar , common salt and oil etc.
4...The advantage of food preservation is to keep food longer, reduce waste.

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1. The push or pull on an object with mass that causes it to change its velocity. SI unit is Newton.
2.A non-contact force is a force which acts on an object without coming physically in contact with it.
A contact force is any force that requires contact to occur.

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Vansh
Case study-1
1-  a process by which edible items such as fruits and vegetables are prevented from getting spoilt.
2. the process of heating up milk to a high temperature for a short time and then cooling it down again quickly.
3. Farmentation.
4. a.Food preservation makes up for the deficiencies in the diet
b. It increases the availability of out of season foodstuffs.

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Nikhil Choudhary
1 ) food preservation prevents the growth of microorganism as well as slowing the oxidution  of fats that cause rancidity
2 ) the partial setrilization of a product , such as milk or wines ,to make it safe for consumption and improve it is called pateurisation
3) fermanitition
4) the advantage of food preservation is to keep for longer, reduce waste
Case study 2

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Neha
.1The process in which food safe for longer time ii called food preservation.
2.Pasteurisation is the process of milk.
3. Refrigeration adding chemicals.
4.To advantage of food preservation is to keep food longer, reduce waste.

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(1)It is a process of  preserve fruit and vegetable for long time
(2) pasteurization is a small process in which we preserve milk
(3) refrigeration
(4) spoilage of food
(5)increased  shelf life

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1.The process in which Food save four longer time is called food preservation.
2.Pasteurisation is the process of preservation of milk.
4. Advantages of food preservation.
A. It decreases wastage of food by
avoiding spoilage.
B. It increase storage period of food material.
Case 2
1. When an iron object is left is damp air for considerable time, it gets covered with a reddish-brown flaky substance. This is called" rusting of iron".

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Shivam Sagar s
1 ans  when an iron object left in damp air for some times and then it covered with brown powdery substance is called rusting of iron.
2 ans chemical nature of rust is basic
3 ans copper become greenish when left in air because it react with oxygen and so I become greenish .
4 ans  silver become black when exposed in air because it combines with oxygen and become black in color .

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Nitesh Attri
The process by which food can be save in long time is called preservation.

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The process by which food can be save for long time it is called food preservation

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The process in which food save for longer time is called food preservation

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once rahul goes to his village, he saw his grandmother dried pickle in sun rays. he was surprised to see that then his grandmother explain that this is process of food preservation. then he understand the concept behind it.
1. what is food preservation
2. what is pasteurisation?
3. name another method of food preservation
4. write two advantages of food preservation?

case study 2
on a research, it is seen that when iron article exposed in air and moisture then, some brown substance formed on the surface on it.
1. what is rusting of iron?
2.what is the chemical nature of rust
3. why copper becomes greenish in color when exposed to air
4. why silver becomes black in color when exposed to air?

case study 3
on research it conclude that earth attract all objects towards it.
it does not depend uopn its mass. object is either macroscopic or microscopic they also follow force of attraction between them
1. what is force. write its S.I unit
2. what is contact and non contact force
3. what kind of force act between when magnet attract magnetic substance towards it?

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Shivam Sagar sahil .
1 ans A push or pull of an object is called force . SI unit – Newton
2 ans contact force are those in which object are in contact with object and bring about changes
Non contact force are those in which object are not in contact with each other and bring about changes
3 ans  magnetic force

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Case study 1
1)Food preservation prevents the growth of microorganisms, or other microorganisms, as well as slowing the oxidation of fats that cause rancidity.
2)Pasteurization is a process of heat processing a liquid or a food to kill pathogenic bacteria to make the food safe to eat. It involves heating the food to kill most harmful microorganisms.
3) Refrigeration, adding chemicals .
4)The advantage of food preservation is to keep food longer, reduce waste.
Case study 2
1) rusting of iron is the process in which iron like object like iron nails are kept in moist air , they get covered with brownlish like substance is called rusting of iron.
2)when iron combines with oxygen and water it forms rust .
3)Copper metal when exposed to air turns green in colour due to corrosion.
4)Silver becomes black because of hydrogen sulfide, a substance that occurs in the air.
Case study 3
1) a pull or a push on an object is called a force . The si unit of force Is newton.
2)contract force - contract forces are force which act only when objects are in physical contract with each other and bring about changes.
Non contract forces - non contract forces are forces which can act even when objects are not in physical contract with each other and bring about changes.

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1. The brown powdery substance come in metal with the presence of water and air is called rusting of iron.
2.. iron oxide
3. copper metal when come in presence of air turns green in colour due to corrosion
4.Silver become black in colour bcz in air hydrogen sulphide is present hydrogen sulphide react with silver and turn into black colour