Workbook Class 6 Science Chapter 16 Garbage In, Garbage out

Chapter 16

Garbage In, Garbage Out

Exercise

I. Answer the following questions in brief:

Ans 1 - can be converted: (a) dry leaves (b) vegetable and fruit

can't be converted: (a) plastic (b) aluminum foil

Ans 2 - Vegetable waste, green leaves, husk is type given to red worms.

Ans 3 - Food that contain salt, pickle, oil, vinegar, meat and milk should not be given to red worms. If you put these things disease - causing small organisms start growing these things disease - causing small organisms start growing. 

Ans 4 - Red worms do not have teeth. They have a structure called 'gizzard' which helps them in grinding their food. 

Ans 5 - Red worms do not have teeth. They have a structure called 'gizzard' which helps them in grinding their food.

Ans 6 - They also need moisture around them. If you take good care of your worms, in a month's time their number will double.

Ans 7 - A paste made of clay paper and rice husk.

Ans 8 - Burning of these produces smoke and gases that are harmful to our health.

Ans 9 - We should not be burnt plastics because it is hazardous to environment and may cause many health problems, including cancers in humans. Plastic should be sent for recycling agencies.

Ans 10 - We should not throw garbage in plastic bags as stray animals look for food in these bags, they end up swallowing these. Sometimes, they die due to this. 

Ans 11 - Plastic bags thrown carelessly cause problems. As a result, drain get choked and the water spills on the roads.

Workbook Class 6 Science Chapter 15 Air Around Us

Chapter 15

Air Around Us

Exercise

I. Answer the following questions in brief:

Ans 1 - 99.2%

Ans 2 - Carbon-Di-oxide

Ans 3 - Those are the dust particles in the air.

Ans 4 - Fine hair and mucus present in our nostrils to prevent dust particles from getting into the respiratory system.

Ans 5 - We should not breathe through our month because harmful dust particles may enter your body.  

Ans 6 - Because when they climb mountains,  as altitude increases, the amount of oxygen level in the atmosphere air decreases. As a result, mountaineers suffer from dizziness.  

Ans 7 - Animals like earthworms living in the soil come out of the soil when it rains heavily because rainwater fills in their burrows and in order to respire they come out of the soil. 

Ans 8 - (a) The windmills is used to draw water from tube wells. 

(b) Windmills are clean and green sources of power.

Workbook Class 6 Science Chapter 14 Water

Chapter 14

Water 

Exercise

I. Answer the following questions in brief:

Ans 1 - In the water cycle, evaporation occurs when sunlight warms the surface of the water.

Ans 2 - In the sunlight, because the temperature in the sunny area is higher than the shade and evaporation takes place at a faster rate at high temperature.

Ans 3 - Plant lose gallons of water every day through the process of transpiration.

Ans 4 - The basic idea behind rainwater harvesting is to catch water where it falls on the Earth's surface.

Ans 5 - Most of our groundwater come from rainfall. 

Ans 6 - Pumping water out of the ground faster than it is replenished over the long - term causes similar problem  Groundwater depletion is caused by sustained groundwater pumping.

Ans 7 - Rainwater harvesting involves the process of diverting rainwater from surfaces to tanks or into the ground, for use at a later stage. By using harvesting rainwater, housing complex and individual households can reduce their dependence on municipal water supply.

Workbook Class 6 Science Chapter 13 Fun with Magnet

Chapter 13

Fun with Magnet

Exercise

Answer the following questions in brief:

Ans 1 (a) Iron, (b) Cobalt

Ans 2 Magnet , A piece of iron.

Ans 3 Iron

Ans 4 No, If we continue to split the magnet we will eventually get down to an iron atom with a north pole and south pole.

Ans 5 (a) Bar magnet   (b) Cylindrical magnet (c) Horse-shoe magnet (d) Ring magnet

Ans 6 (a) Iron - Iron is an extremely well known ferromagnetic

(b) Nickel - Nickel is another popular magnetic metal with ferromagnetic properties. 

(c) Cobalt - Cobalt is an important ferromagnetic material 

Ans 7 Repulsion is the sure test for magnetism because it takes place only between two like poles of magnet whereas attraction takes place between two unlike poles of a magnet and also between a magnetic material.

Ans 8 A bar magnet can be used to create a compass inorder to find the east direction. A compass is an instrument that is used to find direction. One end of the needle is often marked  "N" for north or colored in some way to indicate that it points toward North. East would be the direction that is perpendicular and to the right of the North Needle.

Chapter 10 Managing Files and Folders (Class 5)

Class 5

Chapter 10
Managing Files and Folders

C. Answer these questions.

1. Define a file and folder.
Ans - File - A file is a collection of data or information. 

Folder - A folder is a place to store files or other folders.

2. How can we create a folder?
Ans - Creating a Folder

Step 1: Click the drive icon.

Step 2: Click on New folder.

Step 3: Type a suitable name for the folder 

Step 4: Press the Enter key.

3. What is the use of Computer icon?
Ans - When we double-click on Computer icon  a new window open displaying icons of all the hard disk drives, saved files and folders in it.

4. Write the steps to move a file from one folder to another.
Ans - To move a file from one folder to another-
Step 1: Select the file.
Step 2: Select the destination folder where you want to move the selected file or folder.
Step 3: Click on the paste option.
 
5. What do you mean by resorting a file?
Ans - Restoring a file means returning a deleted file back to its original location.

6. How will you rename a file and folder
Ans - Renaming a File or Folder
Step 1:    Select the file or folder.
Step 2:    Click on Organize button and click on Rename option.
Step 3:    Type the new name and press Enter key.

Chapter 9 Internet Services (Class 5)

Class 5
Chapter 9
Internet Services

E. Answer these questions.

1. Name the two techniques to connect to internet.

Ans - The two main techniques most widely used are:

• Dial-up Connection
• Broadband Connection

2. What is an e-mail id? Name its parts.

Ans - E-mail Id is e-mail address is used to communicate that include user name , @ symbol, company name and domain name.

3. What are emoticons?

Ans - An emoticon is a representation of an emotion using punctuation marks, numbers or letters.

4. Differentiate between dial-up connection and broadband connection.

Ans -

Dial-up connection	Broadband connection
Uses a telephone line to connect a computer to the Internet.	Uses high speed technologies, such as cable modem, wireless, satellite.

5. Write any four points that are required to be a responsible netizen.

Ans - 

• Follow netiquettes.
• Report bullying to an elder.
• Give credit to the person whose work you are using.
• Never open websites that you are not allowed to open.
• Don’t spend all of your time online.                 
  

6. What are social networking websites? Name any two popular social networking sites.

Ans - Social networking websites are websites that facilitate the people to build social relationships. Two popular social networking sites are Facebook and Twitter

Chapter 8 Computer Languages & Problem Solving Techniques (Class 6)

 

Chapter 8

Computer Languages & Problem Solving Techniques

 

C. Answer in short.

 

1. What are binary digits?

Ans – A computer can understand only special signals, which are represented by 1s and 0s. These two digits are called binary digits.

 

2. Which generation uses a visual or graphical interface?

Ans – Fifth Generation uses a visual or graphical interface.

 

3. What do you understand by an algorithm?

Ans – Algorithm is the step-by-step instructions written in simple language to perform a particular task.

 

4. What is a flowchart?

Ans – Flow chart is a step-by-step process of representing the solution of a particular problem in a graphical or pictorial form.

 

D. Answer in detail.

1. What do you understand by computer languages? Name the different categories of computer languages.

Ans – Computers do not understand any other language that we speak. They understand programs written in special languages. The language which helps the user to communicate with computer is called Computer Language.

There are two categories of computer languages:

i) Low Level Language: Low level languages are the machine codes in which the instructions are given in machine language in the form of 0 & 1 to a computer system. Low level language is also divided into parts:- Machine language and Assembly language.

a) Machine Language - It is the first generation language developed for communicating with a computer. It is written in machine code which represents 0 and 1 binary digits.

b) Assembly Language - It is the second generation programming language developed for communicating with a computer. These language use letters and symbols instead of binary digits. Example- As

ii) High Level Language: The high level languages are the most used programming languages that help a programmer to read, write and maintain the codes. It is also the third generation language that is used by many programmers. Example – C,C++, SQL, Visual Basic, etc.

2. What is the difference between high level and low level languages?

Ans – The difference between high level and low level languages are:

 

3. What are the rules for writing an algorithm?

Ans – The rules for writing the algorithm are-

1.         Always begin with the step START and finish with STOP.

2.         Number the statements such as Step 1, Step 2, etc.

3.         Write each step in a separate line.

4.         Function of each statement should be very clear.

 

 

4. What is use of flowchart symbols- Processing box and Decision box?

Ans – Processing box: A rectangle represents the processing of instructions.

 

 

          Decision box: A diamond symbol is used to choose between the two options, yes or no.

 

 

5. Write algorithm for the following problems.

 

a. to read name and phone number and print both.

Ans – To read name and phone number and print both:

Step 1: Start

Step 2: Read name, phone no

Step 3: Print name, phone. No

Step 4: Stop

 

 

b. to read marks and print grade ‘A’ if marks >80 otherwise ‘B’.

Ans – . To read marks and print grade ‘A’ if marks > 80 otherwise ‘B’:

Step 1: Start

Step 2: Read marks

Step 3: If mark > 80

THEN

    grade  ‘A’

ELSE

      grade ‘B’

Step 4: Stop