Science Laws

What is pattern? 12 Types of pattern in different casting explained

Here we discuss about pattern and its all 12 types with figure in different - different casting. but before e start we have to learn about pattern. So pattern means the copy of an objects. In other words duplicate version or structure of an objects or body. But why we need to manufacture the copy piece of an object? we understand this with the help of definition of pattern. So In manufacturing of an object we need to first cast their duplicate structure called mold. Basically mold is nothing but a structure cavity of a real object.

If we want to make a lots of objects similar to one another then we didn't need to manufacture all the objects one by one. we can manufacture it with the help of pattern or mold cavity. look how?

We see the toys, and other decorating things in the market. but how these products will be manufacturing? the answer is with the help of mold cavity.

First of all we need the full structure of a original object which we have to manufacture. Now make a copy version of the duplicate structure of the original one called as mold cavity. Now heat any metal which you want to pure into the mold cavity. After the metal cold remove the sand. your modal will be ready. now polished the modal.

What is Pattern?

Pattern is defined as the model or a copy piece of that object which will be casting to make another object which looks like the original object. This happens inside the sand through mold cavity.

Mold cavity is a structure inside the sand or other object like wood, wax, plastics etc.

Watch this video for the better understanding of Pattern and mold cavity.

Types of pattern in different casting

Single piece
Two piece
Multi piece
Cope and drag
Match piece
Gated
Skeleton
Sweep
Loose piece
Segmental
Follow board
Shell

Read in hindi :- pattern kya hota h?

Aditya Raj Anand

Revised syllabus of physics class 12 cbse 2020 - 21

Physics

Central Board Of Secondary Education: CBSE has reduced the physics, chemistry and math syllabus of class 11th and 12th board exam session 2020 - 21. But here we only talk about the reduced syllabus of physics class 12th. Yes you heard right. CBSE has deleted some of the portions from class 12th physics as well as PCMB.

Please note that CBSE has only reduce some of the portions from physics that doesn't mean they change the exam pattern. The pattern will be same as previous year.

CBSE has only reduced 15% of the overall syllabus from physics class 12 board. This percentage covers both Theory and Practical paper. First we will discuss Theory Portions.

So here are the topics list that CBSE has reduced from physics class 12th board final exam 2020 - 21.

Electric Charges and Field

Deleted portion:- Field due to a uniformly charged thin spherical shell.

Electrostatic Potential and capacitance

Deleted Portion:- No portion deleted

Current Electricity

Deleted Syllabus:- Combination of resistance - series and Parallel, Resistor color codes.

Moving charges and Magnetism

Deleted portion:- Cyclotron

Magnetism and matter

Deleted portion:- Bar magnet as an equivalent solenoid, The dipole in a uniform magnetic field, The electrostatic analog. Magnetic properties of matter, Permanent magnet and electro magnet.

Electromagnetic Induction

Deleted portion:- No portion deleted

Alternating Current

Deleted portion:- Power in AC current: The power factor

Electromagnetic waves

Deleted portion:- Displacement current

Ray Optics and Optical Instrument

Deleted portion:- Reflection of light by spherical mirror, scattering of light, and Optical Instrument.

Wave Optics

Deleted portion:- Polarisation, Resolving power of optical instrument, The validity of ray optics,

Dual Nature of radiation and matter

Deleted portion:- Deviation and germen experiment.

Atoms

Deleted portion:- No portion deleted

Nucli

Deleted portion:- Atomic mass, Nuclear force, Radioactivity, Alpha decay, Gamma decay.

Semi Conductor

Deleted portion:- Zener diode, Zener diode as a voltage regulator.

Communication System

Deleted portion:- Full chapter removed and deleted

All the topics and chapter given above are from NCERT book based pattern. So you must have to keep preparation for class 12th board from NCERT book only. The exam will be fully NCERT pattern.

Aditya Raj Anand

[3+ sample] Application for admission in school for class 11

letter

Here is the more than 3 sample format of writing a letter or application in a school for admission your children in class 11th and 12th board. CBSE board has its own rule. So sometimes they can ask you to write an application according to your need for admission in any classes. So that in this post we have discussed below the top 3 most frequently impressing application for admission in school.

Sample #1

The Principal

_________ school Name.

___________School Address.

__________ School established date.

__ /___ /____ Date

Subject :- Application for admission in school for class 11.

Sir,

Most humbly and respectfully I beg to say that currently I am a student of [your previous school Name]. I have done my class 10th board from this school in CBSE pattern. I have scored [your board marks] in the final exam of 10th board. But Now, for further studies my previous school have no any further class after class 10. So I want to take admission in your school.

I have heard about your school that in last year your school's student have scored good marks in final board exam. So I am very excited to take admission in your school for the study of class 11th and 12th board. It is my request you to please take my admission in your school.

I, Therefore, requested you to please accept my application and permit me to apply admission form of your school. I will be proud with your school and also always be thankful to you.

Name:-

Previous school Name:-

signature:-

Please note that if possible attached one copy of your class 10th board result mark sheet.

sample #2

The Principal

DAV school Mumbai

Plot No 11 Sector 10 Road Airoli Navi Mumbai

Date:- 08/04/2021

Subject:- request letter to Principal for admission in class 11th

Sir/Madam,

I am Abhinav Raj. Currently I am the student of New Saint Paul Academy. I have done my class 10th board from this school situated in Begusarai Bihar. I have scored 86.4% marks in class 10th board exam. But I want to take admission in DAV public School Mumbai for my further studies of class 11th and 12th board.

In this Paragraph mention your reason why you leave the previous school If possible. otherwise it is not so necessary if you don't have any reason.

So, I, Therefore requested you to please allow me to take admission in your school. So that I shall be thankful to you.

Please note that if possible attached one copy of your class 10th board result mark sheet.

Application to principal for admission in science stream

The Principal

_________ school Name.

___________School Address.

__________ School established date.

__ /___ /____ Date

Subject :- Application to principal for admission in science stream.

Sir,

Most humbly and respectfully I beg to say that currently I am a student of [your previous school Name]. I have done my class 10th board from this school in CBSE pattern. I have scored [your board marks] in the final exam. But where I am currently studying, there is no any faculty of science stream for further studies. So I have decided to take admission in your school. Because your school have faculty and management of class 11th and 12th with science stream.

So I, Therefore requested you to please grant my application so that I shall be thankful to you.

Name:-

Previous school Name:-

signature:-

Please note that if possible attached one copy of your class 10th board result mark sheet.

Aditya Raj Anand

Magnetic field lines around a straight current carrying conductor

Physics

In the above figure, there is a straight current carrying conductor crossed through a paper sheets. The paper sheet has a iron filing around the hole from where conductor passed through the paper.

When the current 'i' passes through the conductor. We observed that the iron filing present around the conductor get active and form a concentric circles around the conductor.

This happens because when a current passes through a material it produces magnetic field lines. In the same way here also the straight current carrying conductor produced magnetic field lines 'B' in the form of concentric circles around the conductor.

Factor affecting magnetic field lines around a straight current carrying conductor.

When the distance from the current carrying conductor increases then the magnetic field intensity decreases. That means B ∝ 1/r
When the intensity of current in a conductor increases then magnetic field lines also increases. That means B ∝ I.
When we increases the length of the current carrying conductor then magnetic field lines also increases. That means B ∝ L.

FAQ

state the form of magnetic field lines around a straight current carrying conductor.

The magnetic field lines around a straight current carrying conductor is in the form of concentric circles. The center of concentric circle will be the hole from where conductor passed through the paper.

The magnetic field lines around a straight current carrying conductor at any point is given by

The formula of the magnetic field lines around a straight current carrying conductor at any point is B = k IL/ r². Where k is constant.

Aditya Raj Anand

how to calculate aggregate percentage of 2, 3 and 5 subjects

exams

how to calculate aggregate percentage of 2, 3 and 5 subjects

Calculating aggregate percentage of 2 subjects. Then you must follow the following 4 simple steps to get aggregate percentage of two subjects. or even 3, 5 and 'n' number of subjects.

Step 1:- Identify your total number of subjects.
Step 2:- Write down all the obtained marks in each subjects.
Step 3:- Add the marks of at least two subjects and divide it with 200 and multiply it with 100.
Step 4:- Finally the required percentage is your aggregate percentage of two subjects.

Examples to prove the above rules of calculating aggregate percentage:-

According to step 1. You have to identify the number of subjects. So suppose you have 5 numbers of subjects came in the college exam.

Now, Step 2 says that write all the obtained marks.

Subject 1 = 80 out of 100
Subject 2 = 70 out of 100
Subject 3 = 90 out of 100
Subject 4 = 60 out of 100
Subject 5 = 40 out of 100

In step 3, add all the obtained marks of at least 2 subjects. So we take first 2 subjects to calculate their aggregate percentage.

Aggregate Percentage = 80 + 70 = 150/200

Aggregate Percentage = 150/200 × 100

Required Percentage = 75%

Hence, we can create our formula for calculating aggregate percentage of 2, 3, 5 or even 'n' number of subjects.

So, the formula for calculating 'n' number of subjects is that:

Sum of the obtained marks of 'n' number of subjects / number of subjects

In short, we can also write:-

Aggregate percentage of 'n' number of subjects = Σ 'n' number of subjects / number of subjects.

Aditya Raj Anand

write a letter to your friend telling him about your life during lockdown

letter

Write a letter/email to your best friend or family members telling him/her how difficult was the life during lockdown period.

Patna Bihar

23/03/2021

Dear Friend,

I hope all are fit and fine in this pandemic situation. Lockdown now over but the insecurity of COVID - 19 has not gone from the mind of people. In your previous letter you have asked me to tell how was my life during lockdown period. So I am writing this to just tell you what the things I did during lockdown.

During lockdown as we all know we had restricted to come out from our home. So all the things which I did during lockdown was indoor work. These are the list of things which I did during during lockdown.

I read some motivation novel like ''Think and Grow rich''.
I Played some Indoor games like carrom, chess, even ludo a lot.
I tried some new recipe.
I worked on my body to stay fit and healthy.

All the above things I have tried during lockdown period. Among thing I enjoyed in building my health. I have reduced approx 10 kg of weight in 6 months of lockdown period. So these are my whole works during lockdown.

What was your experience and what you did during lockdown? Write me soon.

Your loving Friend

Aditya Raj

Aditya Raj Anand