CBSE ADDA

1. Metals generally have the following physical properties: A. They are conducting B. They have luster C. They are hard D. They are ductile Mercury has been classified as a metal because of the properties 1. B and C 2. D and B 3. A and B 4. A and D NTSE SAMPLE PAPERS (SUBJECT-WISE)

Sample Paper – 2012 Class – IX Subject – Science ... : 1. What are the characteristics of particles of matter? 2. A sponge can be pressed easily, still it is called a solid. Why? 3. ...

Class X Physics + Chemistry   SA-1                Time- 2 hrs                            MM : 50        General Instructions:- 1. Question 1 to 10very short answer questions of 1 mark each  2. Question no 11 to 16 are short answer questions of 2 marks each   3. Question no 17 to 22 are also short answer question carrying 3marks each  4. Question no 23 and 24 are long answer question carrying 5 marks.  1. What is common to all acids? 2. A white chemical compound becomes hard on mixing proper quantity of water. It is also used in surgery to maintain joins in a fixed position. Name the chemical compound. 3. Name a device that help to maintain a potential difference across a conduct 4. A farmer has found that the pH of soil in his fields is 4.2. Name any two chemical material which he can mix the soil to adjust its pH. 5. Write the pH value, after which teeth start decaying?

Topic: The Cell & Fundamental Unit of life MCQ Q.1: The largest cell in the human body is - (a) Nerve cell          (b) Muscle cell  (c) Liver cell   (d) Kidney cell Q.2: The barrier between the protoplasm and the other environment in an animal cells - (a) Cell wall   (b) Nuclear membrane  (c) Tonoplast    (d) Plasma membrane Q.3: The term ‘Cell’ was given by - (a) Leeuwenhoek       (b) Robert hooke        (c) Flemming        (d) Robert Brown Q.4: Who proposed the cell theory? - (a) Schleiden and Schwann     (b) Watson and Crick (c) Darwin and Wallace (d) Mendel and Morgan Q.5: A plant cell differs from an animal cell in the absence of - (a) Endoplasmic Reticulum  (b) Mitochondria (c) Ribosome (d) Centrioles Q.6: Centrosome is found in - (a) Cytoplasm        (b) Nucleus   (c) Chromosomes   (d) Nucleolus Q.7: The power house of a cell is - (a) Chloroplast (b) Mitochondrion  (c) Golgi apparatus  d) Nucleolus Q.8: Within