Saturday, March 1, 2014

Class IX Science Model Test Paper (Solved) For S.A. II 2014-2015-2016 onward


1 marks
1. Write the symbols of the following elements. (a) Iron (b) Silver

2. State the phylum to which antedon (feather star) and asterias (Starfish) belong.

3. Mention two factors that influence the pattern of winds.

2 marks

4. Distinguish between Bryophyta and Thallophyta stating two examples of each.

5. List the causative organisms for the following diseases.

(i) Kala-azar (ii) Sleeping sickness (iii) Acne (iv) AIDS

6. The volume of 50g of a substance is 20cm3. If the density of water is 1 g/cm3, will the substance float or sink in water ? Justify your answer.

7. What is the work done by the force of gravity in the following cases ?

(a) Satellite moving around the earth in a circular orbit of radius 35000 km.

(b) A stone of mass 250 g is thrown up through a height of 2.5 m.

3 marks

8. Define formula unit mass ? How is it calculated. ? Write the formula unit mass of (NH4)2 SO4 . (Given atomic mass : N = 14 u, H= 1 u, S = 32 u, O= 16 u).

9. (a) If an atom contains one electron and one proton Will it carry any charge or not ?

(b) On the basis of Thomson’s model of an atom explain how the atom is electrically neutral.

10. (a) If the K and L shells of an atom are full then what would be the number of electrons in the atom ?

(b) Helium atom has atomic mass of 4u and has 2 protons in its nucleus. How many neutrons does it have ?

(c) Why are isotopes of an element chemically similar ?

11. Draw diagram of hydra and label the following parts : Tentacles, Stinging cells, Gastrovascular Cavity, Epidermis

12. State appropriate terms for the following :

(i) Animals that are able to maintain a certain body temperature over a wide range of temperature in the environment

(ii) Plants which bear naked seeds (iii) Animals which have pseudocoelom.

13. (a) If penicillin is given to a patient suffering from Jaundice, it doesn’t have any effect on the infection. Why

(b) Name a disease which has been eradicated from the world.

(c) State the principle behind its eradication

14. What is meant by buoyancy ? Why does an object float or sink when placed on the surface of a liquid ?

15. (a) An arrow moves forward when released from a stretched bow. Explain the transformation of energy in the process.

(b) A boy of mass 50 kg climbs up a vertical height of 100 m. Calculate the amount of potential energy he gains.

16. (a) What is the commercial unit of energy ? Give its relationship with S.I. unit of energy. (b) An electric bulb of 60 W is lighted for 10 hrs. every day. How many units of electrical energy is consumed by this bulb in one day.

17. (a) Draw the sound waves for a low pitched and the high pitched sound. (b) Write one use of ultrasonography. (c) Which wave property determines pitch ?

18. (a) Name the process by which carbon is incorporated into life forms ? Also name a process by which carbon is recycled back into the atmosphere. (b) What would happen if the percentage of carbon dioxide increases in the atmosphere ?

19. (i) What is the main function of ozone layer that is present in the atmosphere ? (ii) How are CFC’s harmful to us ? (iii) What is smog ?

5 Marks

20. An element 147 A exists as diatomic gas in nature which is relatively inert and forms 78% of earth’s atmosphere.

(a) Identify the gas and write its molecular formula. Write the formulae of its nitrite and nitrate ions.

(b) How many moles of this gas would contain 12.0441023 atoms of this element. (Aragadros No= 6.22x1023)

(c) Calculate the molecular mass of : (i) NH4NO3 and(ii) HNO3 (Given atomic mass N=14 u, O=16 u H = 1 u)

OR

(a) A sample of vitamin C is known to contain 2.58 = 1024 oxygen atoms 168O How many moles of oxygen atoms are present in the sample. (Aragadros No= 6.22x1023)

(b) Write another elemental form of this element (oxygen). (c) Find the valency of oxygen in CO2 and MgO.

21. (a) State two characteristic features of vertebrates

(b) State reasons for each of the following statements

(i) Echidna and platypus lay eggs but considered as mammals. (ii) Forelimbs of birds are modified.

(iii) Crocodiles have four chambered heart but are still reptiles.

OR

(a) State two characteristic features of amphibians.

(b) Identify the following organisms.

i) Cold blooded animals that lay eggs in water and have three chambered heart

(ii) Spiny skinned organisms which have a peculiar water-drivern tube system that they use for moving around. (iii) Organisms which have an open circulatory system having blood filled coelomic cavity.

22. (a) Derive an expression for Kinetic energy of a body having mass ‘m’ and moving with a velocity v. (b) When velocity of a body is increased 5 times, what is the change in its kinetic energy ? (c) Two masses m and 2m are dropped from heights h and 2 h. On reaching ground, which will have a greater Kinetic Energy and why ?

OR,

(a) State the law of conservation of energy. (b) What is the work done to increase the velocity of a car from 36 km/hr to 72 km/hr if the mass of the car is 1500 kg. Does the work done by the force have a + ve or a - ve magnitude ? (c) Where does an oscillating pendulum has maximum PE and KE ?

23. (a) What is reverberation ? Write two ways of reducing reverberation. (b) Distinguish between tone and note.

(c) With the help of a simple diagram, explain how defects in a metal block can be detected using ultrasound.

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