Posts Tagged ‘Physics’

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?

Class 12 Physics Sample Papers

Please find below a list of Sample Papers in Physics. Download and practice them. All The Best.

CBSE Class 12 Physics Sample Paper 1

CBSE Class 12 Physics Sample Paper 2

CBSE Class 12 Physics Sample Paper 3

CBSE Class 12 Physics Sample Paper 4

CBSE Class 12 Physics Sample Paper 5

CBSE Class 12 Physics Sample Paper 6

CBSE Class 12 Physics Sample Paper 7

CBSE Class 12 Physics Sample Paper 8

CBSE Class 12 Physics Sample Paper 9

CBSE Class 12 Physics Sample Paper 10

CBSE Class 12 Physics Sample Paper 11

CBSE Class 12 Physics Sample Paper 12

CBSE Class 12 Physics Sample Paper 13

CLASS XI PHYSICS IMPORTANT QUESTIONS

3 MARKS:
1) DISTINGUISH BETWEEN FUNDAMENTAL UNITS AND DERIVED UNITS.
2) WHAT ARE THE TWO TYPES OF COLLISION? EXPLAIN THEM.
3) STATE NEWTONS FIRST LAW OF MOTION.
4) TWO EQUAL FORCES ARE ACTING AT A PIONT WITH AN ANGLE OF 60 BETWEEN THEM. IF THE RESULTANT FORCE IS EQUAL TO 20√3N. FIND THE MAGNITUDE OF EACH FORCE.
5) WHAT ARE THE DIFFERENT TYPES OF EQUILIBIRIUM.
6) STATE THE UNIVERSAL LAW OF GRAVITATION.
7) DEFINE GRAVITATIONAL POTENTIAL.
8) WHAT IS REYNOLD’S NUMBER?
9) WHAT IS SURFACE TENTION?
10) DEFINE SIMPLE HARMONIC MOTION.
11) WHAT ARE DEGREES OF FREEDOM?
12) DEFINE SOLAR CONSTANT.

13) DEFINE POWER OF A LENS. WHAT ITS UNIT?
14) STATE TANGENT LAW.
15) WHAT IS THE DISTANE TRAVELLED BY SOUND IN AIR WHEN A TUNING FORK OF FREQUENCY 256HZ COMPLETES 25 VIBRATIONS? (THE SPEED OF SOUND IN AIR IS 343MS-I)

5 MARK:

1. WRITE ANY 5 RULES AND CONVENTIONS OF WRITING SI UNITS.
2. THE HORIZONTAL RANGE OF A PROJECTILE ID 4√3 TIMES ITS MAXIMUM HEIGHT. FIND THE ANGLE OF PROJECTION.
3. STATE THE LAW OF CONSERVATION OF ANGULAR MOMENTEM AND EXPLAIN IT WITH AN EXAMPLE.
4. STATE KEPLER’S LAW OF PLENTARY MOTION.
5. GIVE THE GRAPHICAL REPRESENTATION OF i)DISPLACEMENT ii) VELOCITY iii) ACCELERATION OF A PARTICLE EXUCUTING SHM. MENTION THE DIFFERENCES BETWEEN THEM.
6. What are the characteristics of progressive waves?
7. List out any 5 postulates of kinetic theory of gases.

10 MARK:

1. State and prove parallelogram law of vectors and discuss the special cases.
2. State and prove bernoulli’s theorem.
3. Derive Meyer’s relation.
4. Describe the working of angstrom pyrheliometer with diagram. (NOT FOR CBSE)

Interesting News in Physics

Dancing in the quantum world – physicsworld.com

A new project known as “Danceroom Spectroscopy” represents a genuine fusion of art and science, resulting in an impressive visual art show that is driven by real physical laws.

The project’s mastermind is David Glowacki, a researcher at the University of Bristol in the UK. In this special video report, Glowacki talks to Physics World journalist James Dacey about his stimulus for the project and how the technology involved was inspired by some of the concepts from his research in theoretical chemistry. Glowacki describes how the project came about through a conversation with a friend about making music via motion. “What we quickly found out was that the idea had been done to death, so I came up with a more interesting way of attacking that problem,” he explains.

Read More at physicsworld.com

Worthy Links for those interested in recent develpoments in Physics #1

Recent developments in Physics HANDS-ON CERN -- English version NASA: Climate change may bring big ecosystem changes Physicists Anxiously Await News of the ‘God Particle’ - NYTimes.com

Read more...

PHYSICS QUESTION PAPERS

Find below the links to questions papers in Physics already available at our group of Physics websites

http://physics.2lv.in/must-practice-questions-for-cbse-physics-class-12-solved/

http://plustwophysics.com/how-was-the-cbse-plustwo-physics-question-paper-aissce-2011/

http://plustwophysics.com/kerala-plus-two-physics-sample-question-paper/

http://plustwophysics.com/kvs-chennai-region-physics-preboard-ii-question-paper/

http://plustwophysics.com/third-term-unit-test-sample-question-paper-for-class-xi-cbse/

http://plustwophysics.com/cbse-previous-question-papers-with-answers-and-marking-scheme/

http://plustwophysics.com/icse-physics-question-paper/

http://plustwophysics.com/download-aissce-2011-sample-papers-for-class-xii-cbse/

http://plustwophysics.com/xii-physics-model-question-papers-from-various-boards/

http://physics.2lv.in/latest-cbse-question-paper-in-science-for-class-ix-summative-assessment/

http://physics.2lv.in/nsep-2010-question-paper-and-solutions/

http://physics.2lv.in/a-too-simple-question-paper-from-physics-magnetic-effects-of-current-and-magnetism-for-class-xii/

http://physics.2lv.in/previous-question-papers-cbse-question-paper-2007-class-xii-physics/

http://physics.2lv.in/cbse-xii-aissce-2006-physics-question-paper/

http://physics.2lv.in/sample-question-papers-syllabus-and-guidelines-for-class-ix-and-x-for-term-i-first-term-september2011/

http://physics.2lv.in/selected-physics-questions-for-sa1-for-class-9/

http://physics.2lv.in/viva-voce-questions-from-ohms-law-metre-bridge-potentiometer-galvanometer-and-other-experiments-from-electricity-and-magnetism/

http://123myblog.com/2lv/physics/blog/node/385

What is Eddy Current?

Eddy currents are circulating currents induced in the body of a solid conductor whenever the magnetic flux linked with it changes. It is called EDDY CURRENT because they are like eddies formed in water.

Also read http://askphysics.com/ask-physics/eddy-currents-applications/