CBSE Sample Papers for Class 9 SA2 Science Solved 2016 Set 9

                                                         SECTION -A
Q.1. State the law of conservation of mass.

Q.2. Write the name of the subatomic particle discovered by J. Chadwick.What type of charge occurs on this particle?

Q.3. Name two mammals which lay eggs.

Q.4. Explain in brief the working of the megaphone.

Q.5. Define pressure. Give its mathematical expression and its SI unit.

Q.6. (a) Define atomicity.
(b)State the atomicity of the following molecules :
(i) Oxygen                                        (ii) Phosphorus
(iii) Sulphur                                       (iv) Argon

Q.7. (a) How many electrons are present in the valence shell of nitrogen, oxygen and argon ?
(b)Nucleus of an atom has 5 protons and 6 neutrons. What is the atomic number, mass number and electronic configuration of the atom ?

Q.8.(a) Which of the following species have 18 electrons ?
(b) Chemical properties of all the isotopes of an element are similar. State reason.

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. Raju of Class IX was suffering from chickenpox. His friends Priya and Shaurya wanted to visit him. Shaurya’s parents did not allow him to go. Priya already had suffered from it few months before. Priya’s parents allowed her to visit him. What could be the reason behind their parents’ decision ? What is the basis of principle of immunization ?

Q.11. Differentiate between infectious and non-infectious diseases (any three differences).

Q.12. State the kind of energy transformation that takes place in the following devices :
(1) Electric heater                                        (2) Electric motor
(3) Microphone                                            (4) Steam engine
(5) Hydroelectric power station                (6) Solar battery

Q.13. Define thrust and pressure. Give their SI unit.Calculate the pressure exerted by a block of 45 N if the surface area in contact is 0.5 m2.

Q.14. In a submarine equipped with sonar, the time between transmission of ultrasonic signals and the reception of the echo after reflection is found to be 80 s. Find the distance of the obstacle (from submarine). Speed of sound in water is 1530 ms-1.

Q.15. Name and define the SI unit and commercial unit of energy. Establish a relationship between the two.

Q.16. Dev while watching a show named “Mega-structures” on television observed that metal blocks are used in the construction of big-structures. Workers for detecting flaws or defect inside the metal blocks were using ultrasound.
(a)What is ultrasound ? Write its two other applications.
(b)What value of Dev’s nature depicts from this context ?

Q.17. (a) Write the definition of an atom and explain the significance of a symbol for an atom. Describe how the mass of atoms is measured ?
(b) Why the symbol of iron is Fe and sodium is Na ?

Q.18. Differentiate between the following :
(a)Tube system of feather star and canal system of Euplectella
(b)Skeleton of shark and sea horse
(c)Respiratory organs of tadpole and frog
(d) Forelimbs of birds and lizard
(e) Skin of tree frog and human

Q.19. “Educating parents would help a lot in reducing the incidences of diseases in children”. Justify the statement with five reasons.

Q.20. The sound of an explosion on the surface of a lake is heard by a man 150 m away and by a diver 150 m below the point of explosion. Answer the following :
(a)Explain who will hear the sound of explosion first.
(b)If sound takes t sec. to reach the man, how much time will it take to reach the diver ? (speed of sound in air is 344 ms-1 and in water 1533 ms-1.
(c)Give the audible range of the man. Give one example each of organisms which use waves of: (/) lower than (/’/’) higher than this range.

Q.21. State how force is different from thrust.Give the mathematical form that relates pressure and thrust.
Which will exert more pressure a 100 kg mass on area of 100 square cm or a 50 kg mass on 25 square cm ? (g = 10 ms-2)

Q.22. – Q.24. OTBA Questions of 10 marks.

Q.25. A student while verifying the laws of reflection of sound measured the angle between the incident sound wave and reflected sound wave as 110°. The angle of reflection is :
(a) 110° (b) 55°                    (c) 27°                     (d) 220°

Q.26. A student is doing an experiment to find the pressure exerted by an iron cuboid of mass 10 kg as shown below (g = 10 ms-2) :
CBSE Sample Papers for Class 9 SA2 Science Solved 2016 Set 9-1

Q.27. In case of transverse pulse created in slinky, every particle :

  • oscillates perpendicular to length of slinky.
  • gets displaced from one end to another.
  • does not oscillate.
  • oscillates along the length of slinky.

Q.28. Identify the division to which the following plant belongs :
CBSE Sample Papers for Class 9 SA2 Science Solved 2016 Set 9-2

  • Bryophyta
  • Pteridophyta
  • Angiospermae
  •  Gymnospermae

Q.29. To verify the law of conservation of mass in a chemical reaction, sodium sulphate and barium chloride should be used in the form of:
(a) fine powder                                               (b) large crystals
(c) molten liquid                                              (d) aqueous solution

Q.30. In a chemical reaction, 63.8 g of copper sulphate solution completely reacts with 42.4 g of sodium carbonate solution. After the reaction 56.8 g of sodium sulphate and some amount of copper carbonate were formed. The estimated mass of copper carbonate formed is :
(a)    43.4 g                                                       (b)    56.4 g
(c)106 g                                                             (d)    4 g

Q.31. Soaked seeds of gram and wheat were given to Aman. He removed the seed coats to count the number of cotyledons and correctly concluded that:

  • Gram : Monocotyledonous; Wheat: Monocotyledonous
  • Gram : Dicotyledonous; Wheat: Monocotyledonous
  • Gram : Monocotyledonous; Wheat: Dicotyledonous
  • Gram : Dicotyledonous; Wheat: Dicotyledonous

32. Seeds of pea have :
(a)    one cotyledon             (b)    many cotyledons
(c)two cotyledons              (d)    no cotyledon

Q.33. Feeding structure of adult mosquito is :
(a)    antenna                                                    (b)    head
(c) proboscis                                                    (d)    wing

Q.34. When a body is immersed in a liquid, does it undergo an apparent loss in its weight ? Justify.

Q.35. A ball filled with air has a volume of 500 cm3. Calculate the minimum force applied by a child to put it completely inside the water. (Take g = 10 ms-2)

Q.36. Distinguish between Cockroach and Earthworm by listing their specific features, (two each)

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