# 9th 10th

## The Products of Muslim Countries

November 6, 2012

During the sixteenth and seventeenth centuries, Europeans invented machines and brought about an industrial revolution. They started manufacturing goods on large commercial scale with the help of machines. As a result, cottage industries in Muslim countries suffered a great setback.

November 6, 2012

In the earlier days, the important trade goods included cotton and silk cloth, wool, carpets, pottery, spices, perfumes and jewellery. In those days, the boats of the Muslim sea=men used to carry trade goods and passengers from the Mediterranean Sea to the Red Sea.

## Learn English Tenses Just in 5 Mints

September 9, 2011

Just learn these 12 sentences. For Present Tense Subject verbs the Object. (Indefinite) Subject is verbing the Object. (Continuous) Subject has/have verbed the Object. (Perfect) Subjects has/have been verbing the object. (perfect continuous ) For past Tense Subject verbed the Object. (Indefinite) Subject was/were verbing the object. (Continuous) Subject had verbed the object. (Perfect) [...]

## OR Operation (10th-Physics-Lesson-19.13)

August 23, 2011

If we connect two switches A and B in parallel combination and make a circuit as shown in fig. 19.22. the value of the output current X in this circuit will depend upon the state of the switches A and B, i.e., upon the value of the input variables A and B. In this case, [...]

## And Operation (10th-Physics-Lesson-19.12)

August 20, 2011

In order to understand AND operation, we consider input variables A and B as two switches. There are four possible sates of these two switches which are given below: Both A and B are open                                                          i.e., A = 0, B = 0 The switch A is closed and B is open                                i.e., A = [...]

## Basic Operations of Digital Electronics (Physics-19.11)

August 17, 2011

There are many things which have only two possible states. For example a circuit can be either on or off. It cannot have a third state. Similarly, a given statement would be either true or it would be false. The given answer of a question would be either right or it would be wrong. A [...]

## Transistor (10th-Biology-Lesson-19.7)

August 14, 2011

If a crystal of germanium or silicon is doped in such a way that n-type regions are formed at its two sides with a very thin p-type region in between, it forms an n-p-n transistor. Alternatively the crystal can be formed such that it can have p-type regions at the two sides with a thin [...]

## Semi-Conductor Diode as a Rectifier (Physics-Lesson-19.9)

August 11, 2011

Ordinarily electricity is provided to us in the form of alternating voltage but most of electronic devices operate by direct current (D.C). Therefore, it becomes necessary that we convert the alternating voltage to D.C. the process of converting alternating voltage into D.C. is known as rectification and the device used for this purpose is known [...]

## Semi – Conductor Diode (10th-Physics-Lesson-19.8)

August 6, 2011

When the p and n-regions of a p-n junction are connected to metallic wires and enclosed in a glass or a metallic case in such a way that only the wires connected to n a and p-regions project outside the case, then such an encapsulated p-n junction is known as a diode. Its p part [...]