CBSE > Class 12 > Physics | CBSE Board | Homework Help

They are ask questions related to your class practical and project . Suppose u have do practical related to ray optics thrn they ask from ray optic like defination, law , difference etc

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What r the important theory

Posted by Abhishek Kumar 6 years ago

CBSE > Class 12 > Physics

1 answers

Jd Chouhan 6 years ago

If you will not prepare theory then you becomes fail

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How many number of derivation in a question paper?

Posted by Mayank Chaudhary 6 years ago

CBSE > Class 12 > Physics

1 answers

Shivraj Singh Rathore 6 years ago

Max. 15 no.

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What is dopler effect

Posted by Prashant Bhati 6 years ago

CBSE > Class 12 > Physics

2 answers

Neha Choudhary 6 years ago

Can u explain in short ??

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Yogita Ingle 6 years ago

Doppler’s effect

Doppler Effect is the shift in frequency of light when there is relative motion between the source and observer.
It is used to measure the speed of a receding object.
When the source is moving away from the observer then the wavefronts have to travel a greater distance to reach the observer.
When a star is moving away from the earth the wavelength in the middle of the visible region of the spectrum moves towards the red end of the spectrum.
As a result star looks more reddish when moves away from the earth.
This is known as red shift phenomenon.
When the waves are received from a sourcemoving towards the observer, there is an apparent decrease in wavelength. This is called blue shift.
The fractional change in frequency (Δν/ν)=(–v_radial/c),
Where v_radial= component of the source velocity along the line joining the
observer to the source; v_radial is considered positive when the source moves away from the observer.
Thus, the Doppler shift can be expressed as:
(Δν/ν) = (–v_radial/c);
It is valid when the speed of the source is small compared to that of light.

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two cells of EMF E1 and E2 and internal resistance R1 and R2 respectively are connected in parallel obtain expression for the equivalent resistance and the EMF of the combination

Posted by Siddharth Singh 6 years ago

CBSE > Class 12 > Physics

1 answers

Chirag Sharma 6 years ago

1/R(equivalent)=1/R(1)+1/R(2) E(equivalent)= E(1)R(2)+E(2)R(1)/R(1)+R(2)

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Two cells of emfs e1 and e2

Posted by Siddharth Singh 6 years ago

CBSE > Class 12 > Physics

1 answers

Shivraj Singh Rathore 6 years ago

Then what will we do plz write full or proper query

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What is semi conductor??

Posted by Shashank Singh 6 years ago

CBSE > Class 12 > Physics

2 answers

Jd Chouhan 6 years ago

Those substance which act as insulator at 0 kelvin tempreture but as we increase the tempreture they behave like as conductor and forbidden gap between them is 1 ev approxx

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Yogita Ingle 6 years ago

Semiconductors are those substances whose conductivity lies between conductors and insulators. e.g., germanium, silicon, carbon etc.

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Nuclear Reactor is in syllabus or not?

Posted by Allen Rathi 6 years ago

CBSE > Class 12 > Physics

3 answers

Jd Chouhan 6 years ago

Yes

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Shivraj Singh Rathore 6 years ago

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Neha Choudhary 6 years ago

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How eddy current is indesirable in transformer? & how they are reduced?

Posted by Antara Chowdhury 6 years ago

CBSE > Class 12 > Physics

2 answers

Neha Choudhary 6 years ago

If eddy current is more energy is lost in the frm of heat

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Adi Kumar 6 years ago

It can be reduced by using laminated soft iron core

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Is Nuclear Reactor is in syllabus??

Posted by Allen Rathi 6 years ago

CBSE > Class 12 > Physics

3 answers

Shivraj Singh Rathore 6 years ago

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Amit Mishra 6 years ago

Yes in class 12th

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Anurag Kaurav 6 years ago

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Can i know my practical exam marks after 10 feb i am a student of class 12 science

Posted by Satyam Singh 6 years ago

CBSE > Class 12 > Physics

2 answers

Priya Dharshini ? 6 years ago

Ya.. it depends upon ur school.. and ur teachers.... if ur teachers are good.. u can ask they can give u.. but strict dont even try to ask..

1Thank You

Anurag Kaurav 6 years ago

Its totally depends on your school if they want to tell you they will

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An electron falls through a distance of 1.6 cm in a uniform electric field of magnitude 2010' N/O (Fig. a) Calculate the time it takes to fall through this distance starting from rest

Posted by Harsh Rawat 6 years ago

CBSE > Class 12 > Physics

0 answers

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I can't understand which is last year questions paper

Posted by Charan Hansda 6 years ago

CBSE > Class 12 > Physics

0 answers

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Will be junction transistor in the exam any one know about this topic in semiconductors

Posted by Vanya Singh 6 years ago

CBSE > Class 12 > Physics

1 answers

Adi Kumar 6 years ago

No it is out of syllabi and not come in exam

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Solution of cbse qustion papaer of 2012

Posted by Ashish Sao 6 years ago

CBSE > Class 12 > Physics

0 answers

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How to prepare for objective type questions in physics?

Posted by Priya Sharma 6 years ago

CBSE > Class 12 > Physics

3 answers

Adalat Vishwakarma 6 years ago

Also indicate small definition while reading ncert book

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Priya Sharma 6 years ago

Thank you

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Ã♥╣[-_-]╠♥J ??? 6 years ago

Practice sample papers and solve objectives from ncert book because nothg will come out of from ncert book

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How to do work on practical exam

Posted by Manoj Kumar Yadav 6 years ago

CBSE > Class 12 > Physics

0 answers

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How can i get 90+ marks in physics

Posted by Suraj Sharma 6 years ago

CBSE > Class 12 > Physics

0 answers

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How can i cover all topics in short period to get passed in boards

Posted by Yeshwanth Yesh 6 years ago

CBSE > Class 12 > Physics

1 answers

Prashant Kumar 6 years ago

First of all relax and follow below tips Total 9 units hai which consists 14 chapters and as you just want to pass in physics so, I would recomend you to choose easily chapter as per your mentality and complete those chapters firstly. Then cover few most imp topics which is frequently asked in papers . Easily will score good marks Best of luck

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What i do to get 45 + marks means which type of questions can i do

Posted by Rajdeep Prajapati 6 years ago

CBSE > Class 12 > Physics

1 answers

Adi Kumar 6 years ago

Learn all theory

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Is dielectric and insulator same things

Posted by Kriti Sharma 6 years ago

CBSE > Class 12 > Physics

2 answers

Tejaswani Bhargav 6 years ago

Dielectric is an insulator but they are not same

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Gopal Mishra 6 years ago

No. The dielectric store the energy and insulator blocks the flow of electron

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Questions related to LDR for practical's viva !

Posted by Luv Kapoor 6 years ago

CBSE > Class 12 > Physics

2 answers

Adi Kumar 6 years ago

That is in presence of light or in absence of light

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Adi Kumar 6 years ago

1.Full form 2.when ldr works

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Electrostatic shielding

Posted by Kamla Shankar 6 years ago

CBSE > Class 12 > Physics

1 answers

Aniya Pal 6 years ago

Area which is free from electicfield .

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Is induction similar to polarisation.

Posted by Kriti Sharma 6 years ago

CBSE > Class 12 > Physics

1 answers

Yuvraj Singh 6 years ago

Induction is a general phenomenon where charges are induced in a body when another charged body is brought near it. Polarization on the other hand is one of the means induction happens in dielectrics. That is, induction is the process. Polarization is one of the means to do it

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I feel so tensed whenever i sit for studying and end up studying nothing what should i do please help.?????????

Posted by Kriti Sharma 6 years ago

CBSE > Class 12 > Physics

5 answers

Sanatabassum Tabassum 6 years ago

Thanks

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Gopal Mishra 6 years ago

Dont, worry. You guys. Please make a time table for 3,4 days and complet this tasks. This process apply regularly. And after you follows these tasks you get better result

1Thank You

Luv Kapoor 6 years ago

same problem here yrr

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Rikshesh D. 6 years ago

same here actually

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Neha Choudhary 6 years ago

Same happens with me

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