9th Special test paper My CBSE guide

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Plants fiber and fabric solution Cordova Learning Science class07

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A Tick the correct options: 1. Which of the following is not a natural fibre? (a) cotton (b) rayon √ (c) silk (d) wool 2. Lohi is the breed of (a) cow (b) silk moth (c) sheep √ (d) buffalo 4. Sheep are sheared in season (a) summer √ (b) spring (c) autumn Ö (d) winter 3. How many weeks are required for the eggs of silk moth to hatch? See book (a) one (b) two √ (c) three (d) four 6. Which of the following silk is produced when raw silk is twisted? (a) spun (b) coloured (c) thrown √ (d) mooga 5. What do we call the silky covering spun by the silkworm for its protection? (a) moth (b) larvae (c) pupa (d) cocoon√ B. Fill in the blanks: 1. Alpaca is generally f...
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Derivation of Lens and mirror formula X Reflection and Refraction of light

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MIRROR FORMULA The relation between object distance(u), image distance(v) and the focal length (f) of the mirror is known as MIRROR FORMULA. Consider a concave mirror MM' (of small aperture). An object AB of height h is placed on the left of the mirror beyond its center of curvature so that the image formed is real, inverted and diminished in size(height = h'). Here : Object distance = PB = -u Image distance = PB'= -v Focal length = PF = -f Radius of curvature = PC = -R As shown in Figure, Δ ABP ∼ Δ A'B'P. ∴ A'B'/AB = PB'/PB ∴ A'B'/AB = (-v)/(-u) ∴ A'B'/AB = v/u.............(I) Similarly, as shown in the figure, Δ ABC ∼ Δ A'B'C. ∴ A'B'/AB = CB'/CB ∴ A'B'/AB = (PC-PB')/(PB-PC)........[as CB'=(PC-PB') and CB=(PB-PC)] ∴ A'B'/AB = [-R - (-v)]/[-u - (-R)] ∴ A'B'/AB = (-R + v)/(-u + R)........(II) By (I) & (II), v/u = (-R + v)/(-u + R) ∴ -...
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9th Atoms and Molecules Question bank By KV For CBSE Board

CHAPTER - 3 “Atoms and Molecules” 1. Laws of Chemical Combination 2. John Dalton's Atomic Theory 3. Atoms, ions & Chemical Formula 4. Mole Concept 5. Molar Mass & Avogadro constant Download Test Paper with solution CBSE Study By Jsunil ********************************************************************************* 1 Mark Questions: 1. Who gave law of conservation of mass ? 2. What term is used to represent the mass of 1 mole molecules of a substance? 3. What name is given to the number 6.023 x 10 23 ? 4. What is molecular mass? 5. Give Latin names for sodium & mercury. 6. *How many atoms are there in exactly 12 g of carbon ? 7. Define mole. 8. Calculate formula unit mass of CaCl2. [ At. Mass : Ca = 40 u , Cl = 35.5 u ] 9. Name a diatomic gas. 10. How many atoms are present in H 2 SO 4 . ...
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8th Some Natural Phenomenon-Lightening and Earthquake

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CBSE CLASS CHAPTER NO.15 SOME NATURAL PHENOMENA:Question Banks 1. How many types of charges exist? a. One b. Three c. Two d. Four 2. Who invented the lightning conductor? a. Alexander Fleming b. Graham Bell c. Benjamin Franklin d. Thomas Alva Edison 3. What device is used to protect building from lightning? a. Crescograph b. Anemometer c. Lightning Conductor d. Barometer 4. What scale is used to measure the magnitude of earthquake? a. Richter b. Celsius c. Fahrenheit d. Kilogram 5. The magnitude of earthquakes that occurred at Bhuj and Kashmir were a. less than 4 b. less than 2 c. less than 6 d. Higher than 7 6. Name 2 natural phenomena which cause us heavy damage. 7. Why were the people of ancient times afraid of lightning? 8. What is lightning due to? 9. What was the discovery made by Ancient Greeks? 10. List two daily life examples where charges are produced. 11. What are charged objects? 12....
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Obtaining and Utilization Food Class 7 Science Solved question (Basic Science Questions answers)

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A. Answer these questions 1. Name the three life process help living being to procure energy from food? Answer: Three life processes that help living organisms to procure energy from food are: (i) Digestion (Nutrition) (ii) Respiration (iii) Transportation 2. What are Autotrophs? Name an organism other than other than green plant that is an autotroph. Answer: Autotrophs are organisms that can prepare their own food. Chlamydomonas is a type of green algae which is an example of an autotroph, other than green plants. Cyanobacteria are also an example of autotroph. 3. Name three type of heterotrophic nutrition Answer: Three types of heterotrophic nutrition are: (i) Saprophytic nutrition (ii) Parasitic nutrition (iii) Holozoic nutrition 4. What are enzymes? Answer: Enzymes are chemical substances that act as biological catalysts and are important for carrying out biochemical processes, such as digestion, in our body ...
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