CBSE ADDA

Fully Solved Questions from previous year board Paper Question: 1. What causes buoyant force (or up thrust) on a boat? Answer: Buoyant force is due to volume of boat and density of water. Question: 2. what is the cause of buoyant force? Answer: : The pressure difference on lower part and upper part of a body cause of buoyant force . Question: 3. An Object of volume V is immersed in a liquid of density P. Calculate the magnitude of buoyant force acting on the object due to the liquid Answer: Vd g Question: 4. why does a block of wood held under water rise to the surface when released? Answer: This happens because as upward force is greater than the weight. Question: 5. What happens to the buoyant force as more and more volume of a solid object is immersed in a liquid. When does the buoyant force become maximum? Answer: The buoyant force exerted by a fluid is equal to the weight of fluid displaced. Therefore the buoyant force increases as more and more vol

1. Which animal tissue is commonly known as packaging tissue? [1] Ans: Areolar Tissue 2. What do you mean by photoperiod? Name two processes that are dependent on photoperiod.[2] Ans: Photoperiod is related to exposure of plants to the duration of sunlight. Germination, growth and flowering (any two) in case of plants are dependent on Photoperiod. 3. What will happen if:  i) the skin epithelium is not stratified.  ii) Stratified squamous epithelium lines blood vessels. [2] Ans: i) There will be no protection to the inner layers and wear and tear will be more.        ii) The exchange of substances through selectively permeable surface cannot take place. 4. Name the target organ/organ system of AIDS virus. What is the cause of death in case of people suffering from AIDS? [2] Ans: Lymph nodes/Immune System. In absence of a strong Immune system ,minor infections can turn in to serious problems. 5.To increase productivity per unit area ,the farmers grow two differe

Q1. Define force and its SI unit? Q 2. Distinguish between balanced and unbalanced force? Q3. State three laws of motion? Q 4. What is inertia? Is inertia vector quantity. Justify? Q5. What is impulse? Prove that Impulse is equal to change in momentum? Q. 6. Define momentum and Prove that F = ma Q 7. Is it possible that a body keeps on moving with uniform velocity with? If yes give reason also name scientist who explained this statement? Q 8. Why a person sitting in bus fall forward when moving bus suddenly stops? Q9. Why people sitting in bus fall backward when bus suddenly starts? Q10. Why dust fall on beating carpet with stick? Q11. Why leaves fall when we are shacking branch of tree? Q12. Why an athlete runs certain distance before taking long jump? Q13. When bus takes u turn, passengers sitting inside thrown a side. Why? Q14. Explain why it is difficult for a fireman to hold a hose, which ejects large amount of water at a high velocity. Q15. How a karate

Section A (1 mark Questions) 1. What is the physical state of water ay 1000C? 2. Suggest a method to liquefy atmospheric gases 3. Which separation method will you apply to separate different pigment from extract of flower?

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. ...

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

9th Science chemistry Sample paper Chapter: IS MATTER AROUND US PURE 1. Salt can be recovered from its solution by evaporation. Suggest some other technique for the same? 2. While diluting a solution of salt in water, a student by  mistake added acetone (boiling point 56°C). What technique  can be employed to get back the acetone? Justify your choice. 3. Explain why particles of a colloidal solution do not settle down when left undisturbed, while in the case of a  suspension they do. 4. Smoke and fog both are aerosols. In what way are they different? 5. Name the process associated with the following

CBSE ADDA IX SCIENCE TEST PAPER Chapter-2, Is Matter Around Us Pure Notes and NCERT solution Matter Revision notes MCQ Motion force and law of motion Test Paper Sound Test Paper Motion MCQ WITH ANSWER Motion Important numerical solved Matter in our surrounding solved questions Motion Numerical solved

CBSE ADDA IX SCIENCE TEST PAPER Chapter-2, Is Matter Around Us Pure Notes and NCERT solution Matter Revision notes MCQ Motion force and law of motion Test Paper Sound Test Paper Motion MCQ WITH ANSWER Motion Important numerical solved Matter in our surrounding solved questions Motion Numerical solved

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 a cell the si