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Friday, November 21, 2014

PSA 2015 Answer - Questions Paper and Solution 2015

Clich here to get solution of 9th psa 2015 

Students who appeared for CBSE PSA 2015 can check the Answer Key for PSA Exam here for their
question paper set. We will upload the answer keys of all question papers for both class 9 and class 11here.


The answers for 9th ninth PSA SET D-3

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Saturday, November 8, 2014

8th Chemical Effects of Electric Current solved Questions


Section: A
Q.1 A positively charged ion is called
(A) atom (B) anion C) cation (D) neutral ion

Q.2 The instrument needed to measure the current flowing through a circuit is ?
(A) voltmeter B) voltameter (C) galvanometer (D) ammeter

Q.3 The process in which any electrolyte gets decomposed when electricity is passed through it, is called
(A) electrolysis (B) decomposition (C) dissociation (D) splitting

Q.4 The process of depositing a thin layer of any superior metal over an object of a cheaper metal with the help of electricity is called
(A) electrorefining (B) electrometallurgy (C) electroplating (D) electrowinning

Q.5 Which of the following is the most essential for an electric circuit to work ?
(A) A switch (B) An electric current (C) A switch board (D) none of these

Ans. 1.C                   2.D                   3.A                            4.C                       5.B

Section-B

Q.1 What are conductors ?

Ans: Materials which allow electric current to flow through them are called conductors.

Q.2 What are insulators ?
Ans: Materials which do not allow electric current to flow through them are called insulators


Q.3 Why is distilled water conductor or an insulator ?

Ans: Distilled water is an insulator because there are no salts dissolved in it.


Q.4 What are electrodes ?

Ans:Electrodes are the terminals through which current is passed into a liquid.


Q.5 What is an electrolyte ?

Ans:An electrolyte is a liquid which is a good conductor of current.


Q.6 What happens when an electric current is passed through a conducting solution ?

Ans: A chemical reaction takes place when electric current is passed through a conducting solution.


Q.7 Define electroplating.

Ans: Electroplating is the process of depositing a layer of any desired metal on another metallic
object by means of electricity.

Q.8 Apart from chemical effect, which other effect electric current produce ?

Ans: Electric current can produce magnetic effect


Q.9 Name one non-metal which a good conductor of electricity ?

Ans: Graphite


Q.10 What is electrolysis ?
Ans: Electrolysis is the breaking up of a compound from its solution on passing electric current through the electrolyte.


Q.11 How can distilled water be made a good conductor of electricity ?

Ans: Distilled water can be made a good conductor of electricity by adding acid, base or salt to it.


Q.12 In what proportion the two products from electrolysis of water are obtained ?

Ans: By volume of hydrogen gas is twice the volume of oxygen gas.


Q.13 Why should you not touch electrical appliances with wet hands ?

Ans: Water is a solution of salts and so it is a good conductor of electricity. Therefore, we
can be electrocuted


Q.14 In case of a fire, before the firemen use the water hoses, they shut off the main electrical
supply for the area. Explain why they do this.



Ans: Firemen shut off the main electrical supply for the area because water is a good conductor of electricity and the firemen can get electrocuted


Q.15 Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour ? Explain.

Ans:No, it is not advisable for fire men to carry out electrical repairs during heavy downpour
because water is a good conductor of electricity and the fire person can get shock.


Q.16 What is the disadvantage of electroplating done in the factories ?

Ans: The disposal of the used conducting solution is hazardous and can cause environmental
pollution. There are specific disposal guidelines for environmental protection .


Q.17. Why is chromium used for electroplating ?

Ans: Chromium is used for electroplating because it has a shiny appearance, does not corrode
and is scratch resistant.


Q.18. Why the iron cans are electroplated with tin?

Ans: Tin is less reactive than iron. Thus food, stored in iron cans, is prevented from being spoilt by the iron by electroplating it by tin.


Q.19. After the electroplating of a spoon with silver, it was found that the anode has become thin why ?

Ans:During electroplating, the silver metal from the anode is deposited on the cathode. Therefore, it becomes thin.


Q.20. During electrolysis of water, why does hydrogen collect on cathode and oxygen collect on anode ?

Ans: When electric current is passed in water hydrogen ions (H+) move towards cathode and get collected over it. Hydroxyl ions (OH–) move towards the anode and oxygen is collected on it.


Solution for Basic Science Publication Bharati Bhawan  [Central public School]
To download Pdf. Questions Answer          Click Here

To read Questions Answer                          Click here

Sunday, October 26, 2014

8th Conservation of Animals And Plants[Biodiversity] Solved



Question:  Why should we need to conserve biodiversity?                  
or, What is biodiversity ?What role does it play in an ecosystem ?

Answer:  The variety of plant and animal life in the world or in a particular habitat is called What is biodiversity.
Plants and animals depend on each other for their survival. If we disturb  any of them will affect the life of each other. Hence, we need to conserve biodiversity to maintain the balance of nature.

Question: Differentiate between the Wildlife sanctuary and biosphere reserve.

Answer:  Wildlife sanctuary it is an area within which animals are protected from possible dangers such as hunting. Their habitat is also conserved in this area. It provides protection and suitable living conditions to wild animals. Pachmarhi sanctuary is a wildlife sanctuary.
Biosphere reserve It is a large protected area constructed for the conservation of biodiversity. It helps in the conservation of various life forms such as plants, animals, and micro-organisms. Pachmarhi biosphere reserve is a popular biosphere reserve

Question:  Name the first national park of India? When it was it established?

Answer: A national park is protected land area that provide natural habitat to wild life. Jim Corbett 
National Park is the first national park of India established in 1936.

Question: What is the effect of deforestation on rainfall and climate?

Answer:  Deforestation increases temperature and wind velocity that reduce rainfall. These changes led to climate change.

Question: Why is Gahirmatha Turtle Sanctuary in Orissa famous?

Answer:   Gahirmatha is the only marine wildlife sanctuary of Orissa. Olive Ridley sea turtles migrate in huge numbers

Question: Why is Kaziranga National Park famous ?

Answer:   Kaziranga National Park a world heritage site is famous for the Great Indian one horned rhinoceros.

Question: what is the difference between biodiversity and ecosysterm?

Answer:   Biodiversity refers to the variety in the number and type of organisms found in a given habitat.
Ecosystem is a group of organisms which not only interact with each other but also with their physical environment.

Question:  What are the difference between national park and wildlife sanctuary?

Answer:

National Park
Wildlife sanctuary
it protect both plants and animals
it protect only animals
Tickets or permissions are required to enter into a national park.
Tickets or permissions are not required to visit a wildlife sanctuary
A national park has a definite boundary.
A wildlife sanctuary does not have a specific boundary
Example: Jim Corbett national park (Gujarat)
Example: Krishna wildlife sanctuary (Andhra Pradesh)

Question:  What is the difference between biosphere reserves sanctuaries national parks and zoos?

Answer:  Biosphere Reserves are large areas for conservation of biodiversity, which include both wildlife and plants. 

Wildlife Sanctuary is an area which is free from disturbances from human activities, and is devoted for the conservation and protection of only wildlife. 

National Parks are those reserved areas where no human activity is allowed at all and the purpose of a national park is to preserve the plants, animals, landscape, and the historic objects of that area. 

A zoo or zoological park is a facility in which animals are confined within enclosures, displayed to the public, and in which they may also be bred.

Question:  What is conservation? How is it different from preservation?

Answer:  Conservation means controlled and sustainable use of natural resources whether they are renewable or non renewable. On the other hand preservation refers to the, attempts made to maintain in their present condition and protect them from any harm or decay.

Question:  How does deforestation reduce rainfall on the one hand and lead to floods on the other?

Answer:  When we cut trees, the water that was going to the atmosphere through transpiration is no more making clouds. so, rainfall does not occur.
The roots of the trees are able to hold water. When we cut trees, the flow of water cannot be avoided. Therefore, in this way deforestation leads to floods.

Question:  What are the possible causes of extinction of animal species?

Answer:  Causes for the extinction of species are:-
1. Sudden change in the climatic conditions due to deforestation.
2. Acid rain.
3. Diseases/epidemic.
4. Changes in the sea levels and currents.
5. Exposure to Cosmic radiations.

Question:  On what basis rare animals classified on the basis of IUCN?

Answer:  IUCN (The International Union for Conservation of Nature) is a global environmental organisation that works to conserve natural environment.
Rare species (R) of animals are classified as rare on the basis of their present and past distribution, decline in the population with course of time, abundance and quality of their natural habitat and their potential to reproduce.  Rare species have small population and are scattered in the world. For example- Golden cat.
Question:  What is flora and fauna?

Answer: The term flora is used to denote plants of a particular region or period. Similarly, the species of animals are referred to as fauna. It includes trees in the forests and grasslands as well as trees grown by humans. It includes amphibians, reptiles, mammals, small insects and worms

CBSE 8th science: "Notes and Questions Answers


8th Conservation of Plants and animals -Formative Assessment- Oral Questions - Fill in the blanks - Match the Columns - Think Zone – Puzzle /Quiz –and many more             
Download/Read

8th Science Power  Solution - Conservation of Plants and animals             
Download/Read

Conservation of Plants and Animals
Download File

Check point [Formative Assessment]
Download File

Science power [Solved Assessment]
Download File


8th Conservation of Plants and Animals E-book
Download File


8th Bio –Diversity CBSE Solved test paper -1
Download File


8th Bio –Diversity CBSE Solved test paper -2
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Conservation of Plants and Animals   

Notes  and Solved questions           
Gist Of lesson Quick revision
Worksheet Revision before Exam
Conservation of Plants and Animals[Solved]

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Tuesday, October 7, 2014

10th Value based Questions for SA-II by JSUNIL TUTORIAL

The Board has decided to assess students for 5 percent weighting in each subject at the Summative Assessment level in Classes IX and X through questions which will be integrated with the content of the subject and analysed on the basis of the values it reflects. The questions will be for 5 marks in a question paper of 100 marks and 3-4 marks in a question paper of 70-90 marks. This will be effective from the Summative Assessments-II 2012-2013 in classes IX, X

The sample value based questions deal with the life skills and values attained by students like Self Awareness, Empathy, Critical thinking, Creative Thinking, Decision Making, Problem Solving, effective Communication, Interpersonal Relationships, Coping with Stress and Coping with Anger, and Dealing With Emotions.

Additional Support Material on Value Based Questions for the Session 2012-2013

SA – II Subject: Mathematics Class : X

CHAPTER – 1 ALGEBRA (A P + QUADRATIC EQUATION)

Questions 1. Ram asks the labour to dig a well upto a depth of 10 metre. Labour charges Rs. 150 for first metre and Rs. 50 for each subsequent metres. As labour was uneducated, he claims Rs. 550 for the whole work. What should be the actual amount to be paid to the labours? What value of Ram is depicted in the question if he pays Rs. 600 to the labour?


2. Nidhi saves Rs. 2 on first day of the month, Rs. 4 on second day, Rs. 6 on third day and so on. What will be her saving in the month of Feb. 2012? What value is depicted by Nidhi?


3. 200 logs are stacked such that 20 logs are in the bottom row, 19 in the next row, 18 in the row next to it and so on. In how many rows are the 200 logs placed? What value is depicted in the pattern of logs?


4. How many two digit numbers are there in between 6 and 102 which are divisible by 6. Ram calculated it by using A.P. while Shyam calculated it directly. Which value is depicted by Ram?


5. In a school, students thought of planting trees in an around the school to reduce air pollution. It was decided that the number of trees, that each section of each class will plant, will be the same as the class, in which they are studying e.g. a section of class-I will plant 1 tree, a section of class II will plant 2 trees and so on till class XII. There are three sections of each class. How many trees will


be planted by the students? What value can you infer from the planting the trees?


6. Rs. 9000 were divided equally among a certain number of students. Amit was given the responsibility of dividing this amount among the students but 20 more students admitted to the school. Now each students got Rs. 160 less. Find the original number of students? What value of Amit is depicted in the question?


7. By a reduction of Rs. 2 per kg in the price of sugar, Anita can purchase 2 Kg sugar more for Rs. 224. Find the original price of sugar per kg. What value of Anita is depicted in the question?

8. CBSE 2013

9.CBSE 2013

Q.10.If all the wastes we generate is biodegradable, what effect will this have on the environment ? What value will be imbibed if people are made to understand that generation of waste should be restricted to be biodegradable only ? CBSE 2013

Ans: 
 a. They release CFCs that deplete ozone layer.
b. Green plants are our green lungs and water purifying systems.
c. Yes, they are trying to protect the environment.
d. Food chain is disrupted and drastic climatic changes occur. Major part of biota is lost.

Q.11.In a colony, it was decided to remove a green park and construct an air conditioned shopping mall. Children of the colony took out a march against this decision with several placards to make the colony people aware of the importance of green plants. CBSE 2013
a. What are the ill effects of air conditioners?
b. Design two placards which the children would have carried?
c. Is the action taken by the children justified?
d. How does the ecosystem get affected when plants are removed?

Ans:
(a) It will lead to eco friendly environment, waste product would be converted into re-usable form.
(b) Mutual respect to health and environment conservation.









Q.14. In our society we often come across the abnormal behaviour  of people using alcohol ALCOHOL is a very useful solvent and is also used in  medicines. The people who use alcohol suffer from many diseases of liver and brain . The whole family of such people suffers.

(a) What are the harmful affects of alcohol ? How family life of drunkards suffer ?

(b) What initiatives would you take to make people aware of the harmful affects of alcohol? Write three points . 

Ans:(a) Conduct awareness programme in society, educate people and
students.

(b )Alochol if used by people in excessive amount can cause harmful chronic diseases . The whole family suffers as the economic and social status of such people suffers.

10th Mathematics Value  Based Questions     Download File
10th Science Value  Based Questions             Download File

Value based question for Class X
courtesy:edudel nct  of Delhi

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