STD IX Chapt- 2 ICT Tools

1.     ICT Tools

Q.1 Fill in the blanks

1. A trackball is an ……………. Device. input

2. ……………. Is the cheapest type of computer. Tablet Computer

3……………… are the recently available type of visual display unit. Smart TV

4.In the general packet ……………… service (GPRS) data is split in to packets and transmitted to broadcast frequencies. Radio

5. GSM is acronym for ……………. System for mobile communication. Global

6. CDMA is an acronym for code division …………………… access. Multiple

7. ……………… provides higher channel capacity than TDMA. CDMA

8. With ……………, there are fewer dropped calls. CDMA

9. …………. Is the information Superhighway. Internet

10. Internet uses …….. Communication technology. Digital

Q2. State true or false

1.     A computer is an interactive device True

2.     A computer can execute only those instructions which are defined in its library, True

3.     Advance mobiles use Bluetooth for internet access. False

4.     CDMA stands for Cell Division Multiple Access. False

5.     CDMA is popular over the world. False

6.     CDMA provides higher channel capacity and data throughput than TDMA. True

Q3. Rewrite the following statements by selecting correct options

1.     An example of input device of an computer is …………………….. Trackball.

2.     …………….. is a technology of wireless connectivity of two devices. Bluetooth

3.     The recently introduced type of television receiver set is ………….. Smart TV

4.     The input device of tablet computer is …………………  Touch screen

Q4. Rewrite the following statements by selecting two correct options

1.     Technologies of wireless connectivity are ………… ……………. Wi-Fi , Bluetooth

2.     The two most common types of mobiles are …………. …………….GSM , CDMA

Q5. Answer the following questions.

1.     Give any four examples of input devices and output devices.

Ans: Input Devices:

a.     Mouse

b.     Keyboard

c.      Joystick

d.     Microphone

e.     Scanner

Output Devices:

1.     Monitor (LED, LCD, CRT etc)

2.     Printers (all types)

3.     Plotters

4.     Projector

2.     Give any four examples of

Memory devices of computer:

RAM (Read Only Memory), ROM (Random Access Memory), HDD (Hard disc), Floppy Drive

Common Application of Computer

MS word, MS Excel, MS PowerPoint, MS Access

3.     State any four types of Computers available today?

Ans:   Super Computer, desktop personal computer (PC), laptop/notebook, palmtop/tablet.

4.     Specify the types of televisions available?

Ans:  TV sets have progressed from monochrome to colour. Different types of colour TV monitors are CRT (Cathode Ray Tube), Plasma, TFT LCD(Thin Film Transistor Liquid Crystal Display)and LED (Light Emitting Diodes). The original Black and White Television was replaced by the color Televisions around 1980. These were made of Cathode Ray Tubes (CRT) and are now losing popularity as they are bulky. Liquid Crystal Display Televisions (LCDs) consume less power and occupy less space. The costlier and better TVs today are the Light Emitting Diode (LED) TVs and the Plasma TVs.

5.     State any four applications supported by modern mobile phones and tablet PCs?

Ans: Modern mobile phones support camera, media players, FM radio, personal information manager applications, web browsing, and Wi-Fi and Bluetooth connectivity.

6.     What is Touch Screen?

Ans:  A touch screen is a computer display screen that is also an input device. The screens are sensitive to pressure; a user interacts with the computer by touching pictures or words on the screen.

7.     Write a short note on mobile phone standards?

Ans: A mobile phone is a portable telephone that can make and receive calls over a radio frequency carrier while the user is moving within a telephone service area. The radio frequency link establishes a connection to the switching systems of a mobile phone operator, which provides access to the public (PSTN). Most modern mobile telephone services use a cellular network architecture, and therefore mobile telephones are often also called cellular telephones or cell phones.

8.     State the advantages of CDMA Technologies?

Ans:  

Many users of CDMA use the same frequency, TDD or FDD may be used

Multipath fading may be substantially reduced because of large signal bandwidth

 No absolute limit on the number of users, Easy addition of more users.

Impossible for hackers to decipher the code sent

Better signal quality

No sense of handoff when changing cells

The CDMA channel is nominally 1.23 MHz wide.

CDMA networks use a scheme called soft handoff, which minimizes signal breakup as a handset passes from one cell to another.

CDMA is compatible with other cellular technologies; this allows for nationwide roaming.

The combination of digital and spread-spectrum modes supports several times as many signals per unit bandwidth as analog modes.

9.     Write the uses of Internet?

Ans:

The main uses of the Internet are as follows.

·         Communication: E-mail, and Chat are one of the most important uses of the Internet. These methods are faster more reliable and free and therefore very popular.

·         Business: The Internet has helped businesses by bringing suppliers and manufacturers closer. Using the Internet businesses can directly interact with the consumer thus eliminating the need for costly infrastructure.

·         Social Networking and Personal: The internet has helped bring people across the globe closer. People who have lost contact with each other for several years have been able to re-establish their friendship using social networking sites. Using the Internet it is also possible to make new friends.

·         Entertainment: Besides e-books, tv programs, and music we can also find movies and various other forms of entertainment using the Internet.

·         Employment: In addition to creating several jobs in areas that were formerly not available, the Internet also helps employers and employees get in touch with each other in a cost effective manner.

·         Other services: With the help of the Internet, services such as Banking, Ticketing, Hotel Booking have all become easier.

Q6. Answers in brief:

1.     Write a note on computers?

Ans:

A computer is a general purpose device that can be programmed to carry out a set of arithmetic or logical operations automatically. Since a sequence of operations can be readily changed, the computer can solve more than one kind of problem.

Conventionally, a computer consists of at least one processing element, typically a central processing unit (CPU), and some form of memory. The processing element carries out arithmetic and logic operations, and a sequencing and control unit can change the order of operations in response to stored information. Peripheral devices allow information to be retrieved from an external source, and the result of operations saved and retrieved.

2.     Write a note on Cellular Phone?

Ans

A mobile phone also known as a wireless phone, cell phone, or cellular telephone is a very small portable radio telephone. The mobile phone can be used to communicate over long distances without wires. It works by communicating with a nearby base station (also called a "cell site") which connects it to the main phone network. As the mobile phone moves around, if the mobile phone gets too far away from the cell it is connected to, that cell sends a message to another cell to tell the new cell to take over the call. This is called a "hand off," and the call continues with the new cell the phone is connected to. The hand-off is done so well and carefully that the user will usually never even know that the call was transferred to another cell. A cell phone combines technologies, mainly telephone, radio, and computer. Early cell telephones used analog networks. They became rare late in the 20th century. Modern phones use digital networks.

The first digital networks are also known as second generation, or 2G, technologies. The most used digital network is GSM (Global System for Mobile communication). It is used mainly in Europe and Asia, while CDMA (Code-Division Multiple Access) networks are mainly used in North America. The difference is in communication protocol. Other countries like Japan have different 2G protocols. Some 2G networks are still used. 3G are more common, and some places have 4G.