CBSE ADDA

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 9 th ninth PSA SET D-3 1 3 3 4 4 4 4 4 4 2 4 2 4 1 2 2 4 2 3 3 3 4 1 2 2 4 2 1 3 3 2 4 4 2 1 3 2 2 1 4 4 3 2 1 4 2 3 4 3 4 1 1 3 4 1 3 1 3 4

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 swi

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 plant

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