Chapter 8 More About Visual Basic (Class 8)

 

Class VIII

 

Chapter 8

More About Visual Basic

 

A. Tick the correct answer and fill in the blank.

1. Label  

2. Enable

3. events

4. controls

5. Name

B. Name these controls following tools.

1. Button

2. Check box

3. Textbox

4. Label

5. Rectangle shape

6. Radio Button

 

C. Answer in short.

Que 1. What is the default name of new form added in the Visual Basic?

Ans -  Form1.vb is the default name of new form added in the Visual Basic.

 

Que 2. In which mode do you see the working of your application?

Ans –   In Run mode we see the working of our application .

Que 3. Which event of the command button triggers when user click left mouse button on it?

Ans – Click event of the command button triggers when user click left mouse button on it.

Que 4. What is an event-driven program?

Ans - In an event-driven program, the code of the program gets executed in the response to an event, rather than in the sequence in which they are written. Each action by the user causes an event to trigger.

 

D. Answer in detail.

 

Que 1. What is the use of Properties window in the visual Basic IDE?

Ans - A property refers to the characteristics of an object. The Properties window is use to displays the properties of the selected object. Some commonly used properties are Name, Font, Size, Forecolor, Backcolor, Text, etc. 

             

Que 2. How do you add control on the Visual Basic form?

Ans –   Visual Basic form acts as a background for other controls. We can add controls on the form using two different ways:

*       Select the control to be added on the form by clicking on the tool in the toolbox and then drag it on the form.

*       Double–click the control in the toolbox. It gets added to the top left corner of the current form.

 

Que 3.  Describe any three properties of TextBox control.

Ans –  Three properties of Textbox Control are:

Sn.	Properties	Use
1.	Name	This property sets the name of the TextBox that is used while coding.
2.	Text	This property sets the default text to be displayed in the TextBox.
3.	MaxLength	This property sets the maximum number of characters that a user can type in the TextBox.

 

 

Que 4.  What is Visual Basic? Write any four feature of VB.

Ans –  VB or Visual Basic is a high-level programming language which provides a fast and easy way to create interactive applications. Visual Basic has the following features:

*       It is an event driven language.

*   It provides a collection of mathematical, string and graphical functions.

*       It provides powerful database access controls.

*       It provides useful debugging and error handling tools.

 

Que 5.  What is a form in VB? Describe three of its property.

Ans – The Visual Basic form is used to design an interface by adding various controls on the form using which a user can interact with the application. Like any other control, a form has its own set of properties and events to control its appearance and behaviour.

Sn.	Properties	Use
1.	ForeColor	This sets the color for the text on the form.
2.	BackColor	This sets the background color of the form.
3.	Name	This is used to set the name of the form to refer it.

 

 

Chapter 7 E-mail (Class 6)

 Chapter 7 

E-mail

 

 

A. Tick the correct answer and fill in the blank.

1. Inbox

2. Both of these

3. sign in

4. bold

5. paper clip

 B. Write True or False.

1. True

2. False

3. True

4. False

5. False

C. Answer in short.

1. What is an e-mail ?

Ans – E-mail or electronic mail is a message send electronically from one computer system to another through Internet.

 

2. Write any two advantages of e-mail.

Ans – Advantages of E-mail 

*      E-mail is cost effective and fast.

*      It can reach any part of the world within seconds.

*      Same message can be sent to any number of people at no extra cost.

*      Pictures, documents or music files can also be sent with the message.

 

3. What kind of files can you send as an e-mail attachment?

Ans – We can send files such as pictures, videos and other documents as an attachment with the e-mail at no extra cost.

 

4. What is Sign out?

Ans –Once finished working with our e-mail account, it is important to sign out from your account and close the mail box to avoid its misuse by anyone else.

D. Answer in detail.

1. When do you use the Cc option? What is the full form of Cc and Bcc? What is the difference between the two?

Ans – The Cc option is used to send a copy of e-mail to many recipients.

The full form of Cc is Carbon copy and Bcc is Blind carbon copy. The difference between Cc and Bcc are:

Cc	Bcc
Cc: Used to send a copy of e-mail to many recipients. All Cc recipients are visible to all other recipients.	Bcc: Used to send copy of e-mail but in this case, the recipients in Bcc are not visible to anyone.

 

2. Write the difference between Reply and Forward option.

Ans –The difference between Reply and Forward option are-

Reply	Forward
This action is required to respond to the received mail. By default, reply goes only to the sender of the message. We can add more recipients if we want.	This action is required to share the received mail with others. We can also do modification while forwarding e-mails.

 

3. Write the steps to attach a file to your e-mail.

Ans – To attach a file into our e-mail-

Step 1: Click on Attach files button in the New Message window. A dialog box appears.

Step 2: Select the file to attach.

Step 3: Click on open button. Wait for few seconds the file is being attached. After the file is attached, the mail is ready to send.

Step 4: Click on send button.

 

4. How do you delete a mail and how do you restore it?

Ans – To delete an e-mail:

          Step 1: Select the e-mail by clicking on the checkbox at the left of the e-mail.

          Step 2: Click the Delete  button.

         

          To restore a deleted e-mail:

          Step 1: On the left pane, click More labels.

          Step 2: Choose Trash option. A new screen appears.

          Step 3: Select the e-mail you want to restore and right-click on it. A pop up menu appears.

          Step 4: Select Move to inbox option from the list to restore your e-mail back to the Inbox.

NCERT Solutions for Class 6 Science Chapter 15 Air Around Us

Chapter 15
Air Around Us

1. What is the composition of air?
Ans- Air is a mixture of nitrogen, oxygen, carbon dioxide, water vapour and few gases. Some dust particles may also present in it.

2. Which gas in the atmosphere is essential for respiration?
Ans- Oxygen gas in the atmosphere is essential for respiration.

3. How will you show that air supports burning?
Ans- Take a small burning candle. Cover the burning candle with a glass jar. After few minutes the candle is extinguished. As the supply of air stopped due to glass jar the burning candle is also stopped. This experiment proves that air supports burning.

4. How will you show that air is dissolved in water?
Ans- Take a glass filled with water. On heating, bubbles are seen in the water. The bubbles are formed before water reaching its boiling point indicates dissolve air in water.

5. Why does a lump of cotton wool shrink in water?
Ans- Lump of cotton wool has air among gaps of cotton fibres. When water replaces the air from these gaps, the cotton lump becomes heavy and also shrinks due to removal of air gaps.

6. The layer of air around the earth is known as Atmosphere

7.The component of air used by green plants to make their food, is Carbon dioxide

8. List five activities that are possible due to presence of air.
Ans- Activities that are possible due to the presence of air are:
a) Winnowing
b) Photosynthesis
c) Respiration
d) Transpiration
e) Formation of cloud.

9. How do plants and animals help each other in exchange of gases in the atmosphere?
Ans- Animals and plants use oxygen from air during respiration and release carbon dioxide gas in air. But green plants also release oxygen gas by using carbon dioxide during photosynthesis. Thus, we can say that animals and plants help each other in exchange of gases.

NCERT Solutions for Class 6 Science Chapter 14 Water

Chapter 14
Water

 
1. Fill up the blanks in the following:

(a) The process of changing of water into its vapour is called evaporation or vaporisation.
(b) The process of changing water vapour into water is called condensation.
(c) No rainfall for a year or more may lead to droughts in that region.
(d) Excessive rains may cause flood .


2. State for each of the following whether it is due to evaporation or condensation:

(a) Water drops appear on the outer surface of a glass containing cold water.  Condensation
(b) Steam rising from wet clothes while they are ironed. Evaporation
(c) Fog appearing on a cold winter morning.
Condensation

(d) Blackboard dries up after wiping it.
Evaporation

(e) Steam rising from a hot girdle when water is sprinkled on it.
Evaporation

3. Which of the following statements are “true”?

(a) Water vapour is present in air only during the monsoon. False
(b) Water evaporates into air from oceans, rivers and lakes but not from the soil. False
(c) The process of water changing into its vapour is called evaporation. True
(d) The evaporation of water takes place only in sunlight. False
(e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler. True

4. Suppose you want to dry your school uniform quickly. Would spreading it near an anghiti or heater help you? If yes, how?
Ans: Yes, to dry the school uniform quickly, the uniform is spread near an anghiti or heater because evaporation is rapid at higher temperature. Higher the temperature faster is the rate of evaporation. So the uniform is dried up quickly.

5. Take out a cooled bottle of water from refrigerator and keep it on a table. After some time you notice a puddle of water around it. Why?
Ans: The cooled water bottle has very cold exposed surface. Due to cool surface there is condensation of water-vapour from air on the surface of water bottle because water vapour is present in atmosphere. The condensed water molecules spread around the bottle. So a puddle of water is noticed after sometime.

6.To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the glasses become wet?
Ans: The breathe out gases contain water-vapour. The water-vapour condenses at spectacles so glass becomes wet and with the help of small amount of water, it is easy to clean the spectacles.

7. How are clouds formed?
Ans: The water present on the earth evaporates due to heating by the sun. The water vapour in the air condenses to form tiny droplets of water at high altitude, which appears as clouds. Thus clouds are formed by the condensation of water vapours present in air at high altitude.

8. When does a drought occur?
Ans: If there is no rain for a long period or for many years then there is scarcity of water in that region. This leads to drought.

Chapter 8 Let's Learn Scratch (Class 4)

Chapter 8

Let's Learn Scratch

E. Answer these questions.

1. What is a program?

Ans - The sequence of instructions given to a computer is called a program.

2. What is Scratch?

Ans - Scratch is a visual programming language used to create animations, games, stories and much more.

3. What is a Sprite?

Ans - Each object in Scratch, which is programmed to animate, is called a sprite.

4. What is Scripts/Code area?

Ans - Scripts/ Code area is the area where the code is written. A code is the collection of stepwise instructions that are given to a sprite to do a specific task.

Chapter 8 More About Scratch (Class 5)

 

Chapter 8
More About Scratch

E. Answer these questions.

1. What is Scratch?
Ans - Scratch is a graphical programming language developed by the Lifelong Kindergarten group at the MIT.

2. Define the following: 

(a) Sprite: 

Ans - Each object in Scratch which is programmed to animate is called a sprite. The Scratch cat is the default sprite in Scratch. We can change or add a new sprite.

(b) Backdrop:

Ans - Backdrop is the background of the stage in Scratch. Using backdrop, you can change the visual look of the stage area.

3. What is the use of Sprite Info pane?    
Ans - The Sprite Info pane, located below the Stage, displays detailed information about the sprites in a project. It display the thumbnails of all the sprites in the project.

4. What is the use of Events blocks?
Ans - Events blocks are used to control the events

 

 

Think and Tell  (page no. 105)

Describe the function of each block in short.

1. Ans - When the flag is clicked, the code runs

2. Ans - Controls direction in which a sprite can rotate in

3. Ans - On pressing specified key from the list, the code runs