CBSE Sample Papers for Class 9 SA2 Science Solved 2016 Set 11
SECTION – A
Q.l. Write Latin names of sodium and iron.
Q.2. If K, L and M shells of an atom are completely filled with electrons, then what would be :
(i) The total number of electrons in the atom ?
(ii) Find its valency.
Q.3. What was the modifications introduced by Carl Woese, in the classification proposed by Whittaker ?
Q.4. Gold has relative density of 19.3. What will be its density in SI units ?
Q.5. Can one listen the sound of a huge explosion taking place at moon ? Give reason to support your answer.
Q.6. (a) During respiration, a six carbon molecule-glucose (C6H1206) undergoes combustion. Calculate its molecular mass. [Atomic mass C = 12.0 u, H = 1.0 u, O = 16.0 u]
(b)Find the ratio by mass of the combining elements in the followirg compounds :
(i) AI2(S04)3 (ii) CaCI2
Q.7. Two atoms A and B have the following nuclear composition :
(a)What are the mass numbers and atomic numbers of A and B ?
(b)What is the relation between the two chemical species ?
(c)Which element or elements do they represent ?
Q.8. State reasons for E. Rutherford to choose a-particle for scattering, and a gold foil as a target in his a-particle scattering experiment.
Q.9. (a) Identify and name the kingdoms that comprise of:
(i) Unicellular Prokaryotes (ii) Multicellular eukaryotes without cell wall (iii) Multicellular heterotrophs with cell wall
(b) Identify the phylum with the following features :
(i) spiny – skinned (ii) jointed appendages
(iii) cylindrical body
Q.10.Differentiate between acute and chronic diseases and classify the following diseases into these two groups : elephantiasis, dysentery, measles, tuberculosis.
Q.11.Classify the following organisms on the basis of absence or presence of true coelom (/.e., Coelomate, Acoelomate and pseudocoelomate) : Ascaris, Herdmania, Earthworm, Planaria, Fishes, Humans
Q.12.In a house 2 bulbs of 50 W each are used for 4 hours a day and two 50 W each fans are used 10 hours a day. Calculate the units of electricity consumed in a month of 30 days.
Q.13.State Archimedes’ Principle. Write its two applications.
Q.14.(a)Determine the minimum distance between the listener and reflector for an echo to be heard distinctively of a sound propagating with a speed v ms-1 ? (v = 340 ms-1)
(b)On a hotter day will the speed of sound increase or decrease ? Explain.
Q.15.A light and a heavy object have the same momentum. Find out the ratio of their kinetic energies. Which one has a larger kinetic energy ?
Q.16.One day Tanvi saw from the window of her room that a “Bansuri wala” was going through the street. Tanvi bought the “Bansuri (flute) from him. She started playing with flute and was surprised to hear the musical sound produced by it. She asked her father about its working who explained the mechanism of production of musical sound by the flute’.
(a)What type of waves are produced in the air column of flute ?
(b)What is the difference between a soft sound and a loud sound ?
(c)What quality is shown by Tanvi ?
Q.17.(a)Define formula unit mass.
(b)Give an example each of the following :
(i) A cation (ii) Molecule of a compound
(iii) An element with valency (iv) Triatomic molecule
(c)How many molecules are present in 1.28 g of S02 gas, if the atomic mass of sulphur and oxygen is 32 u and 16 u respectively ?
Q.18.Explain the meaning of the terms and give an example in each of the following :
(a)symbiotic relationship (b) cotyledons
(c)cryptogam (d) saprophytic
(e) prokaryotic
Q.19.About a hundred years ago, when smallpox persisted, a group of people who had this disease earlier and had survived it had no chance of suffering from it again. So having the disease once was a means of preventing subsequent attacks of the same disease.
(a)Why does this happen ? Explain.
(b)We can ‘fool’ the immune system. Clarify.
(c)Name this principle of prevention of diseases.
Q.20. List two differences between thrust and pressure.
What is meant by 1 pascal and 1 newton ? How will the pressure change if area of contact is doubled ?
Q.21. (a) Write an expression for potential energy of an object with mass a placed at height h. Write SI unit of potential energy.
(b)Find the ratio of changed potential energy to the original potential energy if the mass of the object is halved.
(c)Find the ratio of changed potential energy to the original potential energy if the object is now placed at half of its original height from the ground.
SECTION – B
Q.22. – Q.24. OTBA Questions of 10 marks.
SECTION -C
Q.25. When we say that sound travels in air at a speed of 332 ms-1 we meant that:
- air moves with a speed of 332 ms-1.
- source of sound moves with a speed of 332 ms-1.
- the observer moves with a speed of 332 ms-1.
- air does not move forward with the sound wave but it is the disturbance which moves with a speed of 332 ms-1.
Q.26. Which of the following statement is incorrect ?
- Sharp edges increase the pressure.
- Large surface area decreases the pressure.
- A cube will exert equal pressure from all faces. id) A cuboid exerts equal pressure from all faces.
Q.27. A pulse moves ‘n’ times to and fro and the stopwatch shows time’t’ seconds. The time period of pulse is :
(a)nt (b) n2t
(c)t/n {d) t/n2
Q.28. Funeria differs from Dryopteris in having :
(a)Seed bearing plants (b) Vascular bundle
(c)A dependent sporophyte (d) A non-dependent sporophyte
Q.29. When we add BaCI2(aq) to Na2S02(aq), which of the following observations is correct ?
(a) No reaction takes place (b) Colourless solution is formed
(c) White ppt. is formed (d) Green ppt. is formed
Q.30. Aditi was asked by her Science teacher to carry out an experiment to verify the law of conservation of mass. Four sets of apparatus are kept in chemistry laboratory at four places. The teacher asks Aditi to select the apparatus herself. Which of the following sets is most appropriate ?
(a) Conical flask, physical balance, cork, ignition tube Ob) Conical flask, physical balance, ignition tube
(b)Conical flask, physical balance –
(c)Conical flask, physical balance, cork ignition tube, thermometer
Q.31. Four students A, B, C and D studied the types of seed and flower of pea plant and recorded the following observations :
- Monocotyledonous seed and pentamerous flower.
- Monocotyledonous seed and trimerous flower.
- Dicotyledonous seed and pentamerous flower.
- Dicotyledonous seed and trimerous flower.
The student who has recorded correct observations is :
(a) A (b) B (c) C (d) D
Q.32. A group of four students Leela, Megha, Tanya and Kamini observed the roots and leaves of grass and reported it as follows. The correct observation is :
- tap root and parallel venation
- tap root and reticulate venation
- fibrous roots and parallel venation (of) fibrous roots and reticulate venation
Q.33. While observing the life cycle of a mosquito Jai observed mouth brushes in a stage which is :
(a) Larva (b) Eggs
(c) Pupa (d) Adult mosquito
Q.34. A given solid is weighed in air using a spring balance. It is then weighed by immersing it fully in each of the three vessels A, B and C containing water as shown.
In which vessel the weight of the solid will be minimum ? Give suitable reason for your answer.
Q.35. State the condition under which an object floats on the surface of a liquid. What is the volume of the liquid displaced by the object in this state ?
Q.36. The following are the adaptive features of the fishes and birds :
- Presence of streamlined body.
- Presence of air bladder in fish and air cavities in the bones of birds. Write how the above mentioned features help fishes and birds.
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