# Archive for May, 2010

## New MCQ (Multiple Choice Questions) Series

May 28th, 2010

We have started this site to facilitate study material for CBSE students for classes from 9th to 12th. Since in past few months, we were very much busy in some other projects, we were unable to keep the pace in developing the content for this site. Now from next week onwards (Starting from June 07, 2010), we will again start updating this site regularly for the new academic session. You can subscribe the post directly to your mailbox using our E-Mail subscriptions.

From next week apart from regular content (Full text of NCERT books), we will regular post tutorials written by some of the renowned faculties from various colleges for the students of class 10th and 12th. The students may gain some good learning from the experience of these faculties. Some of them are working in academics and some other are working in industry.

New MCQ series

In today’s time, almost very competitive examination is of objective type. So we are going to start Daily MCQ dose for the students of class 12th. Initially, we will start with physics MCQ which would be further extended to Mathematics, Chemistry and Biology. These Objective Type Questions are designed keeping in mind the structure of the various Engineering and PMT entrance examinations. In this series, we will give a daily dose of 10 MCQ for the students to solve and next day, we will provide the answers. We would try to complete the whole syllabus based on this pattern upto end of February 2011 so that the students would be able to compete the entrance examinations.

So be with us and Thanks.

## Physics XI | Chapter 2 : Units and Measurements : Measurement of Large Distances

May 2nd, 2010

2.3.1 Measurement of Large Distances

Large distances such as the distance of a planet or a star from the earth cannot be measured directly with a metre scale. An important method in such cases is the parallax method.

When you hold a pencil in front of you against some specific point on the background (a wall) and look at the pencil first through your left eye A (closing the right eye) and then look at the pencil through your right eye B (closing the left eye), you would notice that the position of the pencil seems to change with respect to the point on the wall. This is called parallax. The distance between the two points of observation is called the basis. In this example, the basis is the distance between the eyes.