Archive for January, 2012

How was your Physics Practical Examination?

Hello students!

It’s the time of AISSCE Practical Examination.

How was your Physics Practical Examination and Viva?

Which questions were asked to you?

Which were the experiments and activities you were asked to perform?

How farely did you do it?

Share your experience here as comments to this post. Your responses will be a boon for the others.

You can post the questions you were asked during Viva so that others can find the answers to them and learn for the Viva during their turn.

Random collection of Physics Viva Questions

1. State the Principle of a potentiometer. (The students say that potential drop is proportional to length but the constant quantities are not mentioned)
2. How can we increase the sensitivity of a potentiometer?
3. Define figure of merit of a galvanometer.
4. Which has more resistance – a galvanometer or a milliammeter?
5. How does an LED emit light?
6. What is the difference between an ordinary diode and an LED?
7. Define principal axis of a convex lens?
8. What happens to the focal length of a concave mirror if it is immersed in water?
9. What are the factors affecting the internal resistance of a cell?
10. What are the difference between primary and secondary cell?
11. Why can’t we use a dry cell for starting a car?
12. What happens to the resistivity of a wire when it is doublefolded?
13. How does the resistance of a wire depend on its dimensions?
14. Why are the resistances used in a resistance box is like 1,2,2,5,10,20,20,50,100,200,200,500,1000,2000,2000,5000 etc?
15. Why constantan or manganin wires are used for making the resistance coils in resistance box?
16. What is a standard resistance?
17. What are the characteristics of a standard resistance?
18. What are the precautions to be observed while doing electricity experiments in general?
19. What is a galvanometer?
20. What is the resistance of an ideal ammeter?
21. Why is ammeter always connected in series and voltmeter always connected in parallel?
22. How can we convert a galvanometer into an ammeter or a voltmeter?
23. What is shunt?
24. What is AVO meter?
25. What is the effect of temperature on the resistance of a conductor?
26. Why does the resistance of a conductor increases with temperature, whereas that of a semiconductor decreases with temperature.
27. What is conductance?
28. What are non ohmic devices? give an example.
29. What are superconductors?
30. Define emf
31. Why emf is said to be a misnomer?
32. What happens if the battery used in the primary circuit of a potentiometer has less emf compared to the emf of the cell used in the secondary circuit?
33. If you find that the galvanometer reading is shaky, what error can you expect?
34. What do you mean by figure of merit of a galvanometer?
35. Why a moving coil galvanometer is called so?
36. What is the principle of a galvanometer?

CBSE EXPLAINS THE WAY TO ATTEMPT EXAM

Excerpt from http://cbse.nic.in/helpline/final_2012.pdf

IN THE EXAMINATION HALL
• Try to think positive and maintain positive attitude giving the test.
• Once in the hall, take time to settle down and set your table.
• Ignore symptoms of anxiety and focus on your task.
• Do not hurry into reading the question paper.
• Read the directions slowly and carefully. If there are any doubts clarify with the instructor, teacher or invigilator.
• Feel comfortable before you start your answers.
• Budget the time and plan the answers. Allocate time for each question.
• Do the simple questions first to help you build up your confidence for the harder questions.
• Choose the best known questions if choices are available.
• If you do not know a question, move on to the next after leaving some space; try it later. If not sure of an answer, do not spend long time thinking and recalling answers. Go to the next question. Handle the less known questions later.
• Leave space after each answer so that you can add later if you need to. Read more…

Problem from Surface Tension

A liquid drop of diameter 4mm breaks into 1000 droplets of equal size . Calculate resultant change in surface energy. the surface tension of liquid is 0.07N/m.

Hints.

• The volume of droplets remains the same. from this you can calculate the new radius.
• Change in surface energy = surface tension x increase in surface area

AISSE 2012 DATE SHEET (CLASS X CBSE)

Thursday,01st March, 2012 10:30 AM
PAINTING 049
Friday,02nd March, 2012 10:30 AM
MATHEMATICS 041
Monday,05th March, 2012 10:30 AM
URDU COURSE-A 003
BENGALI 005
TAMIL 006
TELUGU 007
SINDHI 008
GUJARATI 010
MANIPURI 011
ORIYA 013
ASSAMESE 014
KANNADA 015
ARABIC 016
TIBETAN 017
PORTUGUESE 019
GERMAN 020
RUSSIAN 021
PERSIAN 023
NEPALI 024
LIMBOO 025
LEPCHA 026
BODO 092
TANGKHUL 093
JAPANESE 094
BHUTIA 095
SPANISH 096
KASHMIRI 097
MIZO 098
BAHASA MELAYU 099
URDU COURSE-B 303 Read more…

CBSE Exam Time Table – Class 12 (AISSCE 2012)

Thursday,01st March, 2012 10:30 AM

ENGLISH ELECTIVE 001

FUNCTIONAL ENGLISH 101

ENGLISH CORE 301

Saturday,03rd March, 2012 10:30 AM

POLITICAL SCIENCE 028

LENDING OPERATIONS 620

Monday,05th March, 2012 10:30 AM

PHYSICS 042

ELECTRIC MACHINES 623

AUTOSHOP REP& PRAC 628

FABRICATN.TECH-II 630

AC & REFRGTN-III 632

RADIO ENG.&AUD.SYS 635

M PROD TPT &M COOP 640

FLORICULTURE 643

B THERAPY &H DR-II 654

OPTICS 658

CLINICAL BIO-CHEM. 661

COMM. HEALTH NURII 664

RADIOGRAPHY-I GENL 667

ESTB & MGMT OF FSU 677

DESG & PAT MAKING 685

DYEING & PRINTING 688

ACCOMODAT.SERVICES 691

TRAVEL TRADE MGMT 694

CONFECTIONERY 698

CLSFN.&CATALOGUING 703

POULTRY PDTS& TECH 717

C HEALTH NURSING 731

Read more…