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# Monthly Archives: November 2012

### Subscribe to this site by email ## More questions waiting for answers:

• When a piece of paper is held with its face perpendicular to a uniform electric field the flux through it is 25.0 N·m2/C. When the paper is turned 25.0o with respect to the field the flux through it is?
• A cylinder rests on a horizontial rotating  disc, find at what angular velocity the axes of the disc and cylinder is R and the coefficient of friction U>D/H, where D is the diameter of the cylinder and H is its height.
• Can static friction do non zero work on an object?if yes give example . if no give reason
• How angular momentum is different from linear momentum? ## Questions waiting for answers here!

• If energy is mass-less then why does it cause linear momentum?
• one object is thrown upward with velocity v from height h and another object is thrown downward with same velocity v and other object is thrown horizontally with same velocity v. which of the above will get maximum speed while touching the ground? ## Have you downloaded the question bank cum study material for Class 12 Physics?

Have you downloaded the question bank cum study material for Class 12 Physics?

The following links will help you get all the necessary materials to get more than 60% marks in Physics.  ## Attn: Physics Teachers ! You are invited to disburse your lecture notes through askphysics.com – Free!!! Your contributions will be published only after review. Once published, you can give the links to students so that they can use the notes and other study materials.

Science study materials upto class 10 will also be accepted.

Askphysics.com is a popular website for those who search for free help in Physics online. There are about 50000 visits to the site every month. So, your notes and other study Materials reach the public easily.

Be a popular Physics Teacher! Start publishing now!! ## Investigatory Projects in Physics – FAQs

As you all know, CBSE has reintroduced investigatory projects in Physics and it will be  part of evaluation in Practical exams this year onwards. Here, we would like to answer some of the frequently asked queries. If you have any query please post them as comments to this post.

Q. Will the viva-voce contain questions related to the investigatory project?

A. Yes. The external examiners are instructed to ask questions related to investigatory projects also so as to ascertain the genuineness of the project. The marks assigned to project are mainly based on how you answer the questions related to the project.

Q. Can I do some construction of electronic gadgets as my investigatory project?

A. As the name suggests, the project must be investigatory, ie, you must investigate on some properties or phenomena. Please see the sample projects given by CBSE.

SUGGESTED INVESTIGATORY PROJECTS
CLASS XII
1 To study various factors on which the internal resistance/emf of a cell depends.
2. To study the variations, in current flowing, in a circuit containing a LDR, because of a variation.
(a) in the power of the incandescent lamp, used to ‘illuminate’ the LDR. (Keeping all the lamps at a fixed distance).
(b) in the distance of a incandescent lamp, (of fixed power), used to ‘illuminate’ the LDR.
3. To find the refractive indices of (a) water (b) oil (transparent) using a plane mirror, a equiconvex lens, (made from a glass of known refractive index) and an adjustable object needle.
4. To design an appropriate logic gate combinatin for a given truth table.
5. To investigate the relation between the ratio of (i) output and input voltage and
(ii) number of turns in the secondary coil and primary coil of a self designed transformer.
6. To investigate the dependence, of the angle of deviation, on the angle of incidence, using a hollow prism filled, one by one, with different transparent fluids.
7. To estimate the charge induced on each one of the two identical styro foam (or pith) balls suspended in a vertical plane by making use of Coulomb’s law.
8. To set up a common base transistor circuit and to study its input and output characteristic and to calculate its current gain.
9. To study the factor, on which the self inductance, of a coil, depends, by observing the effect of this coil, when put in series with a resistor/(bulb) in a circuit fed up by an a.c. source of adjustable frequency.
10. To construct a switch using a transistor and to draw the graph between the input and output voltage and mark the cut-off, saturation and active regions.
11. To study the earth’s magnetic field using a tangent galvanometer. ## SAMPLE PAPER-SCIENCE CLASS-X SUMMATIVE ASSESSMENT-II

SUMMATIVE ASSESSMENT-II (2012-13)
SAMPLE PAPER-SCIENCE
CLASS-X TIME -3Hrs
Max.Marks90
GENERAL INSTRUCTIONS:
1. Question paper comprises of two sections, A and B.You are to attempt both the sections
2. All questions are compulsory
3. All questions of section A and all questions of section B are to be attempted separately
4. Question numbers 1 to 3 in section A are one mark questions,to be answered in one
word or one sentence
5. Question numbers 4to7 are two mark questions, to be answered in about 30 words each
6. Question numbers 8 to19 are 3 marks questions, to be answered in about 50 words
7. Question numbers 20 to24 are 5 mark questions, to be answered in about 70 words
8. Question numbers 25 to 42 in section B are MCQ based on practical skills. Each question
is a one mark question
SECTION-A
1.
Name the element which has twice as many electrons in its second shell as in its first shell. Write its electronic configuration also.
1
2.
Give common name of the plant on which Mendel performed his experiments.
1
3.
In a food chain comprising frogs, insects, birds and grass, which one of the organisms is likely to have maximum concentration of harmful non biodegradable chemicals in its body?
1
4.
Choose from the following elements whose atomic numbers are given in parentheses
H(1), He(2), C(6), F(9), Na(11), Cl(17), Mg(12)
a) Smallest element of 3rd period.
b) A noble gas.
c) A metal of 3rd period having valency 1.
d) Most non metallic element of 2nd period.
2
5.
What is meant by least distance of distinct vision? How does this vary between the very young and old people?
2 (more…)

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