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## Very Important Portions for class 12 Physics for CBSE Board Exam 2017

### Please revise these portions thoroughly

• Electric Dipole : electric field due to a dipole on axial line and equatorial line, torque on a dipole in a uniform electric field, work done in rotating a dipole, potential energy of a dipole in a uniform electric field.
• Gauss Theorem and applications
• Metre bridge experiments, Potentiometer principle and experiments
• Ampere’s circuit law and applications
• MCG and conversion to ammeter and voltmeter
• Cyclotron
• LCR series circuit and resonance, expression for resonant frequency, Q factor, Power factor
• Optical instruments (complete)
• Theory of interference, Young’s double slit experiment, expression for fringe width, graph
• LOGIC Gates (complete)
• Electromagnetic spectrum, production and uses of em waves
• Photo electric effect (compete: experimental setup for study of photoelectric effect, conclusions, Einstein’s equation and explanation to laws of PEE.)
• BE per nucleon vs atomic mass graph and explanation to release of energy during nuclear fission and fusion.
• CE transistor characteristics and CE transistor amplifier
• Need for modulation
• All block diagrams from “Communication”:
• Total internal reflection and applications

## Question Bank in Class XI Physics – Mechanical Properties of Solids

Important Points to remember:

• Deforming forces are external force applied on a body to change its size or shape.
• Restoring force is the internal force developed in a body trying to bring it back to the original configuration when it is acted upon by an external force trying to change its size or shape.
• Elasticity is the property of a body by virtue of which it tries to regain its original configuration when the deforming forces are removed.
• Perfectly elastic body is a body which regains its original configuration completely on removal of deforming forces.
• Plasticity is the property of a body by virtue of which it does not regain its original configuration on removal of deforming forces.
• Perfectly plastic body is a body which does not show any tendency to regain its original configuration on removal of deforming forces
• Stress: The restoring force developed per unit area of a deformed body is called stress.
• Tensile stress: If a deforming force is trying to produce an increase in length, then the restoring force developed per unit area of cross section is called tensile stress
• Compressive Stress: When a deforming force acting normal to a surface tries to produce a change in volume, then the restoring force produced per unit area is called compressive stress.
• Shearing stress: When a tangential force tries to change the shape of a body whose bottom is fixed, then the restoring force developed per unit area is called Shearing stress.
• Strain: The ratio of the change in dimension to the original dimension of a deformed body is called strain
• Linear or longitudinal strain

## Class VI Science Question Bank

HIGHER ORDER THINKING SKILLS
FOOD: Where does it come from.
1. You are the manager of a restaurant, make a list of food items you would serve in lunch.
2. What measures are to be taken to avoid wastage of food.
3. Why are humans considered omnivores?
4. List the ingredients of any five food items you relish.
5. Form pairs of words in group A with words in group B.
A—Mustard plant, Nectar, Beetroot, carnivore, omnivore.
B– Honey, sugar, oil, humans, tiger.
6. Name two aquatic plants eaten as food.
COMPONENTS OF FOOD
1. Why is it necessary to have fresh and un-cooked vegetables and fruits in our diets.
2. Doctors advice us to drink atleast two litres of water daily why?
3. What happens (more…)

## Class VIII Science Question Bank

Download a good collection of questions from Class 8 Science NCERT Textbook. The collection includes questions requiring Higher order thinking skills (HOTS

Question Bank for VIII Science

## SA1 Previous Question Papers in Science for class 9 and 10 (CBSE) with marking Scheme

As per request from numerous student visitors, we are publishing some previous question papers used in the previous years. You can use them to prepare for the present exams and score better marks. The previous question papers give a hint on the type of questions. Practice the questions below to check your timing.

Class X Science SA1 Previous Question Paper 2

Class X Science Answer Key 2

Class IX Science SA1 Previous Question Paper 1

Class IX Science SA1 Answer Key 1

Class IX Science SA1 Previous Question Paper 2

Class IX Science SA1 Answer Key 2

## Discuss the Difficult questions of AISSCE 2012

How was the Physics Question Paper for AISSCE (CBSE Class 12) 2012?

Many students complained that many questions of Physics question paper AISSCE 2012 were unexpected and hard.

Do you think so?

Post the questions you felt hard or unexpected here as comment to this post. Let us discuss them here.

## A fill up exercise for class 9 Physics from the chapter “Sound”

Dear students,

Find below some of the fill in the blanks questions  from the chapter sound. (Class 9 Science) Practisinf fill in the blanks typwe questions helps better comprehension and thorough reading of the text book. As a follow up you can try making more fill in the blanks type questions yourself from the textbook.

1. ______ is a form of energy which produces a sensation of hearing to our ears.
2. λ is a symbol of representing _____________.
3. __________ is the reciprocal of frequency.
4. Mechanical waves are of two types; _____________ and ______________.
5. Sound waves travel in the form of ____________ and __________________.
6. Transverse waves propagate in the form of _________ and _____________.
7. The maximum displacement of the wave from mean position is called ______________.
8. Number of vibrations completed in one second is called ________________.
9. The distance between two consecutive compressions or two consecutive rarefactions is called ______________.
10. Sound of frequency below 20 Hz is called _____________
11. velocity of sound = ___________ x wavelenth
12. Sound cannot travel in _____________
13. Sound of frequency greater than 20 kHz is called ___________
14. _______________ is used to check abnormalities of fetus.
15. SI unit of frequency is _________.
16. ____________ is a device used to measure the depth of sea.
17. SONAR’s full form is __________________________________
18. Sound travels fastest in ____ medium
19. Loudness of sound depend on _____ of vibration.
20. Audible range for human beings is from _ Hz to ___ Hz.
21. Bats detect their prey using ___________– waves.
22. Sound heard after reflection from an obstacle or boundary is called ________-.
23. The persistence of sound after the source has stopped vibrations is called ________.
24. ___________ is a device used by doctors and its working is based on multiple reflection of sound.
25. Loudness of sound is determined by the ___________ of vibrations.
26. Checking the functioning of heart with the help of ultrasound is called ________________
27. The outer ear is also called ________
28. Another function of human ear is to _____________ our body.
29. _______ of ear collects sound from the surroundings.
30. Ultrasound are produced by some animals like __________, _____________ and _____________.
31. Electrical signals from ear are send to the brain via _____________
32. The three bones of the ear which amplifies the vibrations are _______ , ______________ and ____________.
33. ______________ converts sound into electrical signals.
34. The smallest bone in ear is __________ which is also the smallest bone in human body.
35. ____________ are regions of higher density and pressure when sound propagates through a medium.

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