World Of Science And Technology

Sunday, November 21, 2021

How to hide Instagram Chat ?

Most of the Instagram users have their personal or private chats which they want that anybody can`t access that Instagram messages of the conversation.

Kaviyon Kee Kavitaen / कवियों की कविताएँ (कविता संग्रह)

कवियों की कविताएँ - प्रताप कुमार

कवियों की कविताएँ (कविता संग्रह) में विभिन्न प्रकार की प्रकाशित और अप्रकाशित कविताओं का संकलन है। यह पुस्तक में लिखी गई कविताओं के मुख्य विषय प्रेरणात्मक, ज़िन्दगी के अनुभवों, देशभक्ति, और कुछ बदलते समय का सजीव चित्रण है। इस पुस्तक में कई प्रेरणात्मक कविताएँ पाठकों के अंदर एक नया जोश भरेंगी। वहीं कुछ कविताएँ जीवन के उतार - चढ़ाव को समझाने की कोशिश करेंगी।

Poems of Poets (Poetry Collection) is a collection of various types of published and unpublished poems. The main themes of the poems written in the book are inspirational, life experiences, patriotism, and live depictions of changing times. Many inspirational poems in this book will fill a new spirit in the readers. At the same time some poems will try to explain the ups and downs of life.

Product information

Publisher ‎Notion Press; 1st edition (22 October 2021)

Language ‎Hindi

Paperback ‎38 pages

ISBN-10 ‎1684872766

ISBN-13 ‎978-1684872763

Item Weight ‎49.9 g

Dimensions ‎12.7 x 0.23 x 20.32 cm

Country of Origin ‎India

Buy Now:-

(1) Buy On Flipkart

(2) Buy On Amazon.in

(3) Buy On Amazon.com

(4) Buy On Amazon.co.uk

Wednesday, February 3, 2021

New Release Book "Advanced Uses Of Measurement For Class 9 Part-1"

Advanced Uses Of Measurement For Class 9 Part-1

Buy On Amazon Link:-Click Here

Buy On Notion Press Link:- Click Here

Monday, January 18, 2021

My First Book "Inspire Life With Quote"-"संस्कार से संसार" By- Pratap Kumar

Search On Google:- "Inspire Life With Quote"

This is my book cover photo.

You can buy my book click here.

Wednesday, January 6, 2021

Vidyaniketan Public School Organise New Compitition For Student

Click Here

Friday, January 1, 2021

Happy New Year 2021

Happy New Year 2021 and good luck for new beginnings! May your life be as bright as Sun, as beautiful as flowers, and you be showered with blessings and happiness. Happy New Year 2021! Wishing you a year filled with blessings of God.

Monday, December 7, 2020

To determine the Energy Band Gap of a Semiconductor by using PN Junction Diode.

Aim: To determine the Energy Band Gap of a Semiconductor by using PN Junction Diode. Apparatus: Energy band gap kit containing a PN junction diode placed inside the temperature controlled electric oven, microammeter, voltmeter and connections brought out at the socket, a mercury thermometer to mount on the front panel to measure the temperature of oven. Formula Used: The reverse saturation current, Is is the function of temperature (T) of the junction diode. For a small range of temperatures, the relation is expressed as,

Where, T is temperature in Kelvin (K) and Eg is the band gap in electron volts (eV). Graph between 103/T as abscissa and log10 Is as ordinate will be a straight line having slope = 5.036 Eg Hence band gap,

Theory: A semi-conductor (either doped or intrinsic) always possesses an energy gap between its valence and conduction bands (fig.1). For the conduction of electricity, a certain amount of energy is to be given to the electron so that it can jump from the valence band to the conduction band. The energy so needed is the measure of the energy gap (Eg) between the top and bottom of valence and conduction bands respectively. In case of insulators, the value of Eg varies from 3 to 7 eV. However, for semiconductors, it is quite small. For example, in case of germanium, Eg = 0.72 eV and in case of silicon, Eg = 1.1 eV.

In semi-conductors at low temperatures, there are few charge carriers to move, so conductivity is quite low. However, with increase in temperature, more number of charge carriers get sufficient energy to be excited to the conduction band. This lead to increase in the number of free charge carriers and hence increase in conductivity. In addition to the dependence of the electrical conductivity on the number of free charges, it also depends on their mobility. The mobility of the charge carriers, however decreases with increasing temperature. But on the average, the conductivity of the semiconductors rises with rise in temperature. To determine the energy band gap of a semi-conducting material, we study the variation of its conductance with temperature. In reverse bias, the current flowing through the PN junction is quite small and internal heating of the junction does not take place. When PN junction is placed in reverse bias as shown in fig.2(a), the current flows through the junction due to minority charge carriers only. The concentration of these charge carriers depend on band gap Eg. The saturation value, Is of reverse current depends on the temperature of junction diode and it is given by the following equation,

Precautions: The following precautions should be taken while performing the experiment: 1. The diode must be reverse biased. 2. Do not exceed the temperature of the oven above 100℃ to avoid over heating of the diode. 3. The voltmeter and ammeter reading should initially be at zero mark. 4. Bulb of the thermometer should be inserted well in the oven. 5. Readings of microammeter should be taken when the temperature is decreasing. 6. Readings of current and temperature must be taken simultaneously. Sample viva voce questions: 1. What is PN junction diode? 2. What do you understand by band gap of a semi-conductor? 3. What do you mean by valence band, conduction band and forbidden band? 4. How many types of semi-conductors are there? 5. What are P-type and N-type semi-conductors? 6. Define doping and dopant. 7. Why P-type (N-type) semi-conductor is called Acceptor (Donor)? 8. What do you mean by Fermi energy level? 9. What is the position of Fermi level in an intrinsic semi-conductor and in a p-type or n-type semi-conductor with respect to the positions of valence and conduction bands? 10. What do you mean by forward biasing and reverse biasing? 11. Why diode is reverse biased in determining the band gap of semi-conductor? 12. What is the shape of graph between log10 Is and 103/ T? How do you find band gap energy from this graph? 13. Why conductivity of metals decreases with increase in temperature? 14. Why conductivity of a semi-conductor increases with increase in temperature? References:  Solid State Electronic Devices by Streetman and Banerjee  B.sc Practical Physics by Geeta Sanon

Thursday, October 22, 2020

JNUEE 2020 Answer Key Released by NTA, Download JNU Entrance Test Answer Key

JNUEE 2020 Answer Key Released: As per the latest update, National Testing Agency – NTA has formally released the JNUEE Answer Key 2020 for the recently concluded entrance exam. Along with the answer key for JNUEE 2020, the exam authority has also released the Question Papers for the entrance examination. Candidates who have appeared the entrance exam can check the provisional answer key for JNUEE 2020 exam by logging onto the exam portal jnuexams.nta.nic.in. Alternatively, candidates can also click on then link provided below to download JNUEE 2020 Answer Key, which will take you directly to the result checking the below link:

IMPORTANT LINKS

Download JNUEE 2020 Answer Key / Question Paper – Direct Link (Available Now)

JNUEE Answer Key 2020: (Available above the line 👆)

JNUEE Question Papers 2020: Click Here(Available)

JNUEE Cut off 2019: Click Here(Available)

JNUEE Cutoff 2020: Click Here(Available Soon)

All students want to download own question paper and check with answer key. So today this post is helpful for all my website visitors and followers. Best of luck to all my viewer.

Objection Window by 22^nd October

Taking into account the delay in holding the JNUEE 2020 Entrance Exam, the NTA has given a short window to raise objections or challenge the answer key for the candidates. The window to raise challenges will remain open for candidates until 22^nd October 2020 at 10 PM. Candidates who appeared for JNUEE 2020 Exam in CBT mode from 5^th to 8^th October 2020, can now log onto the website to raise challenges or objection against the answer key by paying the requisite processing fee of Rs 1000/- per answer challenged. The fees is to paid using digital means like Debit Card / Credit Card and Net Banking.

How to Download JNUEE 2020 Answer key online?

To make access to JNU Entrance Exam 2020 provisional answer key, the exam authority has published the answer key on the official exam portal run by NTA. Candidates who are not sure about the process of downloading the JNUEE Answer Key 2020, can follow the step-by-step process mentioned below:

Step 1: Visit official website i.e. jnuexams.nta.nic.in
Step 2: Find and Click on Link for Display Question Paper / Challenge Answer Key
Step 3: You will be redirected to new page with two links
Step 4: Select the link for which you details available to log onto the portal
Step 5: Input the required details, verify them and submit them
Step 6: Your JNUEE 2020 answer key and question paper links will be displayed
Step 7: Download the answer key and use it to verify your answers.

JNU Minimum Marks

Here we are providing the minimum marks for various courses offered by JNU to get admission in session 19-20:

Subjects Minimum Marks out of 100

General SC ST OBC PH EWS FN

MA Politics (with specialization internat) 86 77 79 82 69 83 47

MA Economics (World Economy) 93 71 51 75 56 85 39

MA Geography 80 74 73 76 69 75 35

MA Philosophy 86 74 78 82 42 83 62

MA Political Science 69 57 59 61 52 61 33

M.Sc Physics 89 76 65 85 59 85 40

MA English 80 68 70 73 67 74 51

Previous Years Cut Off

The cut off will be released separately for all the courses and categories. Here we have mentioned the Cut off for previous year for various courses (round 1):

Course General OBC SC ST PH FN

MA in Hindi 51 47 42 38 46 NA

MA in Economics 77.7 58.6 56.9 65 51 44.2

MA in Urdu 77 67 37 54 58 NA

MA in Sociology 70.19 57 59 67.5 38 45

MA in Geography 46.06 39.08 38.11 38.09 32.6 NA

M.Sc in Chemistry 68 62 51 45 NA NA

M.Sc in Environmental Sciences 59 55.75 46.5 41.75 36.5 31.25

MA in Development and Labour Studies 55 45 42 46 48 NA

Here students can check the Cut off for previous year for various courses (round 2):

Course General OBC SC ST PH FN

MA in Hindi NA NA NA NA NA NA

MA in Economics 73 54.25 40.5 37.5 25.75 NA

MA in Urdu 76 NA NA NA 53 NA

MA in Sociology 69 56.5 54.5 NA NA 41

MA in Geography 42.55 38.39 37.23 NA 25.56 NA

M.Sc in Chemistry 66 56 NA NA NA NA

M.Sc in Environmental Sciences 57.25 55.5 44.5 NA 27 NA

MA in Development and Labour Studies NA 44 NA NA NA NA

Also check last three years Cut-Off:

JNUEE 2013 Cut-Off
JNUEE 2014 Cut-Off
JNUEE 2015 Cut-Off
JNU 2017 CEEB Cut-off

JNU Admission Procedure 2020

After the written test, candidates will also have to qualify the Viva-voce (as applicable). A merit list will be prepared on the basis of marks scored in the JNU entrance exam.

JNU admission process will get started after the release of merit list. Firstly, candidates will have to register for counselling for admission. Registration process will start from October 2020 for non viva courses and for viva courses.

Candidates are required to appear at the prescribed date and venue to participate in the counselling process.

Seats will be allotted to students on the basis of merit, category, choices filled by candidates and seats availability.

If you have any other queries about JNU 2020 Cut Off, you can leave your queries in the comment box.

Friday, September 25, 2020

To determine the refractive index of the material of a given prism using a spectrometer.

REFRACTIVE INDEX OF PRISM USING A SPECTROMETER

AIM:- To determine the refractive index of the material of a given prism using a spectrometer.

APPARATUS:- A spectrometer, a spirit level, a source of monochromatic light (sodium vapour lamp), a glass prism, a magnifying lens and a reading lamp.

Theory:- When a beam of light strikes on the surface of transparent material (glass, water, quartz crystal, etc.), the portion of the light is transmitted and and other portion is reflected. The transmitted light ray has small deviation of the path from the incident angle. This is called refraction. Refraction is due to the change in speed of light while passing through the medium. It is given by snell’s law

where i is the angle of incident, r is the angle of refraction, n1 is the refractive index of the first medium and n2 is the refractive index of the second medium.

To determine the angle of the Prism:

Make coincide the slit with the cross wire using fine angle adjusting slider. Then note the reading in the tabular coloumn. Move the telescope in the opposite direction and do the same. Find the difference between two angle ie 2θ.

OBSERVATION:- Write down the actual readings taken upon the apparatus.Take at least three readings of each observation and record them in tabular form as far as possible. Avoid overwriting. This part of the record of the experiment is very important and hence should be written clearly and carefully.

CALCULATION:- Write down the formula to be used and substitute the values obtained to calculate the result. Simplification should be done on the left page. Do logarithmic calculation.

RESULTS:- Write clearly the actual result obtained from your observations.

PRECAUTIONS AND SOURCES OF ERRORS:- Give the precautions taken when conducting the experiment. Discuss the reasons for not getting standard results.

EXPERIMENTAL RESULTS(Approx):-

(1) Angle of Prism = 60°

(2) Angle of Minimum Deviation = 37.2° (degrees).

(3) Refractive Index Of Prism = 1.5

Download Admit Card Of JNUEE 2020

Download Admit Card Of JNUEE 2020

Click Here:- NOW

Monday, September 21, 2020

Central University Common Entrance Test (CUCET) 2020 Questions Paper and Answer Key

Central University Common Entrance Test (CUCET) 2020 is a best option for those students who want to take addmission in reputated colleges and universities. In this examination you have more option for take admission in huge amount of various courses.

Some students want to take addmission on own choice so this examination is the better opportunity for the students.

Some course are given below:-

(1) M.Sc. Physics

(2) M.Sc. Statistics

(3) M.Sc. Mathematics

(4) M.Sc. NanoScience And Technology

(5) M.Sc. Bio - technology &

(6) M.Sc. Chemistry etc.

Answer key of questions paper:-

Test Paper Code	Answer key
PGQP26	Click Here
PGQP28	Click Here
PGQP32	Click Here
PGQP54	Click Here
PGQP55	Click Here

Final Answer Key

Test Paper Code	Final Answer key
PGQP26	Click Here
PGQP28	Click Here
PGQP32	Click Here
PGQP54	Click Here
PGQP55	Click Here

(1) M.Sc. Physics Questions Paper are given below:-

Add caption

Fee Structure of different courses are given below:-

Tuesday, September 15, 2020

Events Monthly


15 Sep 2020