Class X Physics

CBSE RESULTS 2012

The CBSE Results 2012for class X (AISSE) and class XII (AISSCE) will be published by the third week of May 2012.

For Class X, the CCE details are being uploaded by the Vidyalayas to CBSE server. The schools are given time till 15 April for updating the marks up to Summative Assessment 2 for Class X 2012.

The results will be published at http://cbseresults.nic.in

The results of both Board Based exams and School Based Exams will be published together.

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ICSE Physics Sample Paper 2011

Click the link below to download ICSE Physics Sample Paper

ICSE Physics 2011 sample paper

CBSE Class X Physics SA 1 Questions and Answers

 
1. Suggest two reasons which make the large scale usage of nuclear energy prohibitive.
2. Why are solar cookers  covered by a glass plate?
3. What is the colour of insulation over the earth wire? Why is an earth wire connected to metallic part of appliances?
4. What are the factors on which the resistance of a conductor  depends upon? Write a mathematical expression for the same.
5. What is a solar panel? Mention any three of its applications.
6. Write four characteristics of a good source of energy.
7. Why is a series arrangement not used in domestic circuits?
8. An electric iron has rating 750 W, 220 V; Calculate (i) Current passing through it, (ii) Its resistance when in use.
9. Draw magnetic field lines around a bar magnet. List any two properties of the magnetic field lines.
10. How can a piece of soft iron be transformed into an electromagnet? Draw a circuit diegram to show the same.
11. (a) A 12 V battery is connected to the arrangement of resistors below. Calculate (i) the total effective resistance of the arrangement. (ii) The total current in the following circuit.

(b) State Ohm’s law. What constant can be obtained by calculating the slope of a VI graph?

Optional Proficiency Test for Class-X

CBSE is conducting an optional proficiency test in all the five main subjects from next year.

The proposed Proficiency Test is being conducted with the broad objectives of :

• acting as a benchmark in testing of skills and higher mental abilities of students
• providing motivation to students for academic excellence in the respective subject
• providing feedback to students and parents on how well the students have achieved the desired learning objectives.
• providing feedback to schools on levels of learning of their students and setting
• goals, priorities and targets in their future educational plan.

Some of the specific objectives of the proposed test include assessing students;

• abilities and skills to apply concepts and principles of the subject to everyday life situations.
• abilities to apply understanding of concepts to interpret data, diagrams, maps, graph etc.
• skills to create and devise methods for solving subject related problems.
• abilities to analyse, synthesise and evaluate a given situation on the basis of learning in the subject.

What is a Proficiency Test?
A proficiency Test measures an individual’s abilities and skills in a domain or subject to know how well he/she has learned, understood and internalised the related concepts and principles. Such a test in language e.g may assess a student’s skills in reading, writing, listening, speaking or vocabulary. Similarly a test in Science may focus on assessing students’ abilities to apply concepts and principles to analyse a given situation, solve a given problem and conduct practical work efficiently. A test in Mathematics may similarly assess problem solving abilities and skills of mathematical thinking, mathematical reasoning and procedural techniques followed by students. Thus, the proposed Proficiency Test will mainly focus on assessing students’ abilities and skills to apply knowledge and understanding of any subject to new and unfamiliar everyday life situations.
The core testing element of such a test will include observing, comparing, classifying, solving, translating, interpreting, analyzing, synthesising, creating, composing, deducing, justifying and judging/evaluating.

General Features of the Test
It will be optional in nature. Only those students who wish to take this test willingly may appear.
There will be separate test in each of the five main subjects viz English, Hindi, Social Science, Mathematics and Science.
A student may appear in one or more subject (s) according to his/her choice. One test will be held on a single day.
It will be a paper-pen test to be administered on the same day across all willing schools in the country.
The proposed test is likely to be conducted in the month of May/June next year (2011).

Students wishing to appear in the test will have to pay separate examination fee for the same. This fee is likely to be in the range of Rs.500/- to Rs.1000/- for all the subjects. The schools will be informed about the exact amount of fee and its submission mode at a later stage.
Any student studying in Secondary or Senior secondary school affiliated to CBSE and has appeared in Class-X final examination (School conducted or Board conducted ) is eligible for this test.
Students appearing in the test will be issued a joint certificate by CBSE and the collaborating agency indicating percentile rank.
Design of the Question Paper
The duration of the test in every subject will be 2½ hours.
Question paper in every subject will carry 100 marks
All questions will be of multiple choice type with only single correct answer.
The test will be based on classes IX-X syllabus in the subject prescribed by CBSE

The typology of questions will be different from the type of questions asked in conventional final examination conducted by the Board at the end of Class-X. The test will not include any direct recall, information-based or memory –based questions. It will only include questions to assess students’ skills and abilities to apply understanding of concepts to analyse a given situation or an unfamiliar
everyday life problem.
The total number of questions may vary from one subject to another.
The questions included in the question paper will be of varying difficulty level.
Negative marks will be awarded for wrong answers

Electricity – Class X CBSE

Some important points to remember

• The resistance of a conductor does not change when the current through it is changed or the voltage across it is changed. When current is changed, the voltage across it is also changed so that the ratio V/I = R
• The value of resistance changes if the dimensions (length or area of cross section of the conductor) changes or the temperature changes.
• When the dimensions of a conductor is changed, the resistance changes, but the resistivity does not change.
• When temperature is changed, both resistivity as well as resistance changes.

Electric Fuse – A Safety Device

• Electric Fuse is a Safety device
• It works on the principle of Joule’s law of heating
• It consists of a fuse wire made of an alloy of tin and lead, which melts and breaks the circuit whenever current in the circuit exceeds safe limits due to overloading or short circuit