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## Elasticity

### Introduction:

Elasticity is the ability of a body to resist a distorting influence and to return to its original size and shape when that influence or force is removed. Solid objects will deform when adequate force is applied to them. If the material is elastic, the object will return to its initial shape and size when these forces are removed. Hooke’s Law states that the force should be proportional to the extension.

### Chapter Analysis:

The last three years have had one question being asked consecutively from the chapter. With only 6 question in the past 11 years, this chapter happens to be a low weighted chapter. So going by the general trend, we should not be expecting anything more than 1 question from this chapter.
The below given graph will illustrate the above-mentioned analysis: Year 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009
Questions 1 1 1 0 1 1 1 0 0 0 0

The important topics to be covered from this chapter are:
• Elastic Behavior
• Stress-Strain Relationship
• Hooke’s Law
• Young’s Modulus
• Bulk Modulus
• Shear Modulus of Rigidity
• Poisson’s Ratio
• Elastic Energy

### Tips and Tricks:

• The students must begin with reading the NCERT portion as it has a good basic explanation of the chapter and helps form the base for further reading. Here is the link to the NCERT PDF version of the mentioned chapter:
• Flash Cards are to be created by the students so that they are able to revise the parts and their functions easily.
• Mnemonics may be created uniquely by the student so that they are able to retain the parts in their mind easily.
• All the past year questions must be solved so that one understands the type of questions that are asked in the paper.

## Flow of Liquids

### Introduction:

Fluid Flow is a part of fluid mechanics and deals with fluid dynamics. Fluids such as gases and liquids in motion are called as fluid flow. The motion of a fluid subjected to unbalanced forces. This motion continues as long as unbalanced forces are applied.

### Chapter Analysis:

No questions were asked in the years from 2009-2014 from this chapter. However, from 2015, one question each was asked till 2018, and in 2019, 2 question was asked. Thus, we can see that this chapter is being now observed much more by the paper setters, and hence, we should be expecting atleast 1 question from this chapter in the upcoming papers.
The below given graph will illustrate the above-mentioned analysis: Year 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009
Questions 2 1 1 1 1 0 0 0 0 0 0

The important topics to be covered from this chapter are:
• Pressure Due to a Fluid Column
• Pascal’s Law and its applications
• Effect of Gravity on Fluid Pressure

### Tips and Tricks:

Since this is a low weighted chapter, one cannot devote much time to this. Thus, one must turn to reading this chapter with smart mentality. The following points might be helpful:
1. Reading the NCERT shall be the first step towards understanding this chapter. Here is the link to the NCERT PDF version of this chapter:
2. Making Mind Maps is a must for this chapter as the topic is easily forgotten by many students.
3. Proper revision is also compulsory. Revision every fortnight will be good as the bulk chapters will make this chapter be easily forgotten is not revised.
4. One must refer to online videos for clearer understanding of the topic.

## Viscosity

### Introduction:

The viscosity of a fluid is a measure of its resistance to deformation at a given rate. For liquids, it corresponds to the informal concept of thickness. For example, Syrup has a higher viscosity than water. Viscosity can be conceptualized as quantifying the frictional force that arises between adjacent layers of fluid that are in relative motion.

### Chapter Analysis:

Expect for the year of 2015 and 2013, no question has been asked from this chapter in the other years. The last 4 years have had a drought for the questions from this chapter. Hence, we should not be expecting any question from this chapter in the upcoming paper.
The below given graph will illustrate the above-mentioned analysis: Year 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009
Questions 0 0 0 0 1 0 1 0 0 0 0

The important topics to be covered from this chapter are:
• Viscosity
• Stokes Law
• Terminal Velocity
• Streamline and Turbulent Flow
• Critical Velocity
• Bernoulli’s Theorem and its applications

### Tips and Tricks:

• NCERT will form the base for the understanding of further queries and it provides a stern platform to further work on. Here is the NCERT PDF version of the chapter:
• There are various flow charts in this chapter. Hence, they must be created in a single large sheet of paper and looked upon at regular intervals.
• There is a huge number of unique terms and keywords. Hence, they must be revised regularly. Once in a fortnight is a must.
• The diagrams must be practiced and understood clearly. Video explanations can be looked onto if one finds difficulty in understanding the diagram.

## Surface Tension

### Introduction:

Surface Tension is the tendency of fluid surfaces to shrink into the minimum surface area possible. Surface tension allows insects, usually denser than water, to float and slide on a water surface. Surface tension results from the greater attraction of liquid molecules to each other than to the molecules in the air.

### Chapter Analysis:

Expect for the year of 2014 and 2013, no question has been asked from this chapter in the other years. The last 5 years have had a drought for the questions from this chapter. Hence, we should not be expecting any question from this chapter in the upcoming paper.
The below given graph will illustrate the above-mentioned analysis: Year 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009
Questions 0 0 0 0 0 1 1 0 0 0 0

The important topics to be covered from this chapter are:
• Surface Energy and Surface Tension
• Angle of Contact
• Excess of Pressure across a Curved Surface
• Application of Surface Tension ideas to Drops, Bubbles and Capillary Rise

### Tips and Tricks:

• The students must begin with reading the NCERT portion as it has a good basic explanation of the chapter and helps form the base for further reading. Here is the link to the NCERT PDF version of the mentioned chapter:
• Flash Cards are to be created by the students so that they are able to revise the parts and their functions easily.
• Mnemonics may be created uniquely by the student so that they are able to retain the parts in their mind easily.
• All the past year questions must be solved so that one understands the type of questions that are asked in the paper.
• Revision every week should be done to keep the chapter fresh.