CBSE Sample Papers for Class 9 SA2 Science Solved 2016 Set 13
SECTION – A
Q.1. Define a polyatomic ion. Give one example of it.
Q.2. If the atomic number of an element is 18, find out the following :
(a)Valence electron
(b)Valency
Q.3. Write two points of difference between Protozoa and Porifera.
Q.4. A sharp knife is better than blunt knife. Explain, why.
Q.5. If the time period of small ripples on water is 0.1 sec. and their wavelength is 6 cm. Find the speed of the ripple.
Q.6. (i) Write the full form of IUPAC.
(ii) Hydrogen and oxygen combine in the ratio of 1: 8 by mass to form water. What mass of oxygen gas would be required to react completely with 3 g of hydrogen gas ?
Q.7.(a) An atom has 4 protons and 5 neutrons. What is its valency ?
(b)An ion M13 has 10 electrons and 14 neutrons. Find the atomic number and mass number of M.
Q.8. (a) Compare relative molar mass and relative formula unit mass.
(b) Calculate the molar mass of HNO3, and compare it with its formula unit mass. (Atomic mass H = 1 u, N = 14 u, 0 = 16 u)
Q.9. Presence of certain features provides the basis for classifying an organism as a chordate. Mention any four features. Name a protochordate.
Q.10. What are the three limitations that hinder the approach to deal with infectious diseases ? Q.11. Differentiate between infectious and non-infectious diseases (any three differences).
Q.12. A car is moving on a levelled road and gets its velocity doubled. In this process :
(a)how would the potential energy of the car change.
(b)how would the kinetic energy of the car change.
(c)how will its momentum change ? Give reasons for your answer.
Q.13. If two forces in the ratio 5:7 act on two areas in the ratio 4:5, find the ratio of pressure exerted.
Q.14. Waves of higher frequencies are used to measure depth of the sea.
(a)Name these waves.
(b)Give the frequency of these waves.
(c)Give one more use of these waves.
Q.15. Define work. Give its SI unit. State two factors on which the magnitude of work depends. Give one example each for positive and negative work done.
Q.16. Sunita is a student of class VIII. During summer vacation the school arranged an educational trip to Agra. During their visit to Taj Mahal, when Sunita and other students entered the mausoleum of Mumtaj Mahal and king Shahjahan, she heard a mild persistent sound. Sunita asked her science teacher, who told her that it is due to reverberation and echo.
(a)What is the difference between reverberation and echo phenomena ?
(b)What qualities are exhibited by Sunita ?
Q.17. (a) You are given an element . Find out
(i) Number of protons, electrons and neutrons in ‘X’.
(ii) Valency of ‘X’.
(iii) Electronic configuration of ‘X’.
(b) If bromine atom is available in the form of, say two isotopes (49.7%)and (50.3%). Calculate the average atomic mass of bromine atom.
Q.18. Give reasons :
(a)Animals of phylum platyhelminthes are called flatworms.
(b)Bryophytes are called amphibians of the plant kingdom.
(c)Fungi are called saprophytes.
(d) Bacteria and tapeworms are very different in their body design.
(e) Plants like Pinus and Deodar are called gymnosperms.
Q.19. (a) Which of the following diseases will cause major ill-effects on general health-Elephantiasis, Cough and Cold, Tuberculosis, Diarrhoea.
(b)What are such diseases called ?
(c)Why do such diseases have major ill-effects on general health?
Q.20. (a) State reason for the following statements –
(i) An army tank weighing more than a thousand tonne rests upon a continuous chain.
(ii) A truck has much wider tyres.
(iii) Cutting tools have sharp edges.
(b) A force of 100 N acts on a surface of area 25 square cm. Calculate thrust and pressure. Calculate the changed pressure if the force now is reduced to 25 N.
Q.21. (a) Derive an expression for kinetic energy possessed by an object of mass m moving with velocity v. Also state the SI unit of kinetic energy.
(b) A ball of mass 400 g rolls on a ground with uniform speed of 25 ms-1. Find the kinetic energy possessed by it.
SECTION – B
Q.22. – Q.24. OTBA Questions of 10 marks.
SECTION – C
Q.25. In an experiment to verify the laws of reflection of sound the angle of reflection in the figure depicted is :
(a)60°
(b) 30°
(c)can be (a) or (b)
(d)45°
Q.26. While performing an experiment to find the pressure exerted by a solid iron cuboid on loose sand, Ravi took help from his friend about the formula to determine pressure and its SI unit. The correct formula and SI unit respectively are.
Q.27. A teacher gave a metallic slinky to four students A, B, C and D and asked them to produce a longitudinal pulse in it. The method adopted by the four students was as :
(a)Tied one end of slinky to a rigid support and after stretching jerked it vertically up and down.
(b)Tied one end of slinky to a rigid support, stretched it and then twisted its coils.
(c)Tied one end of slinky to a rigid support, stretched it and then compressed and released it along its length.
(d)Tied one end of slinky to a rigid support on a table, stretched it and then jerked it perpendicular to its length.
The correct method adopted for producing longitudinal pulse was by :
(a)A (b) B
(c) C (d) D
Q.28. Out of the following the plant which is not an angiospermic is :
(a) mustard (b) brinjal
(c) coconut (d) pinus
Q.29. Given below is a chemical equation to show the formation of iron sulphide by heating a mixture of iron and sulphur:
Calculate the mass in g of sulphur unreacted when 28 g of iron reacts with 22 g of sulphur to form 44 g of iron sulphide. Mass of unreacted sulphur is :
(Relative atomic masses,:Fe = 56u and S = 32u)
(a) 22 g (b) 6 g
(c)16g (d)12 g
Q.30. When sodium sulphate solution reacts with barium chloride solution the substance which will appear as precipitate is :
(a) Barium chloride Ob) Barium sulphate ,
(c) Sodium sulphate (d) Sodium chloride
Q.31. What do the parts labelled A, B, C and D indicate ?
(a)A – stamen, B – sepal, C- carpel, D – petal
(b)A – sepal, B – stamen, C- petal, D – carpel
(c)A – sepal, B – petal, C- stamen, D – carpel
(d)A – carpel, B – stamen, C- sepal, D – petal
Q.32 The plant whose features are fibrous roots and leaves with parallel venation is :
(a) tamarind plant (b) pea plant
(c) gram plant (d) grass
Q.33. A student after observing the life cycle of a mosquito, identified the stages as egg , pupa,adult. Fill up the blank by choosing the correct option :
(a) Maggot (b) Nymph
(c)Larva (d) Insect
Q.34. A spring balance calibrated in Newton reads 19.6 N. Calculate its mass in grams.
Q.35. State two factors on which buoyant force acting on an object immersed in a fluid depends ?
Q.36. Aman observed an earthworm and saw a swollen region towards the anterior side of the earthworm.
(a)What is this region called ?
(b)Which segments constitute this swelling ?
(c)What is the role performed by this region ?
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