CBSE ADDA

Q. Write two differences between isobars and isotopes. Ans:  Isobars           (i) Isobars have the same mass number but different atomic numbers (ii) Isobars have different  chemical properties Isotopes Isotopes have the same atomic number but different mass numbers. Isotopes have similar chemical properties. Q. Why do isotopes shows similar chemical properties. Ans: Due to same number of  electron  in valance shell Q. How Rutherford concluded that the center part of any atom not empty? Ans: When Rutherford experimented with  alpha particles , then he realized that few particles bounced back directly. Rutherford’s result lead him to believe that most of the foil was made of empty space, but had  extremely  small, dense lumps of matter inside, which is present only at the center because from center, few particles bounced back. All other particles deflected at different angles. So Rutherford concluded that the center part of any atom is nucleus not

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CBSE Class 10th Social Science Question Papers by jsunil Find CBSE class 10th Social Science sample paper for the Second term examination. Question has been framed as per the syllabus covered in the first term examination. SUMMATIVE ASSESSMENT – II, 2014 Class – X, SOCIAL SCIENCE SAMPLE PAPER Time allowed: 3 hours                                                     Maximum Marks: 90 1 marks Questions 1. Which of the following was not a feature of the Conservatism in Europe after 1815? (a) Established traditional systems of state and society (b) Efficient Bureaucracy (c) Modern army   (d) Democracy OR Which of these was not the challenge faced by the new Republic of Vietnam ? (a) Attack of the French armies to regain control. (b) Division of Vietnam. (c) Fall of the Bao Dai regime (d) Young generation’s emigration to Japan. 2. Which of the following is false about the Hapsberg Empire ? (a) It ruled over Austria – Hungary (b) It comprise