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1 Units Covered- UNIT 1: Atoms and Molecules UNIT 2: Work & Energy UNIT 3: Sound UNIT 5: Structure of Atom Sample Paper 2012 Class IX Subject Science UNIT 1: Atoms and Molecules 1 Mark Questions Q1. How many atoms are present ina. H 2 S molecule b. PO 3-4 ion Q2. According to Dalton s atomic theory, what is the definition of atoms? Q3. Calculate the molar mass of Nitric Acid HNO 3 (atomic mass of H=1, N=14, 0=16) Q4. Calculate the no of moles for 53g of He. Q5. How many molecules are present in 34 g of ammonia? 2 Marks Questions Q6. When ice melts, there is decrease in volume instead of increase. Why? Q7. Calculate % composition of Sulphur element in H 2 SO 4. Q8. Which has more no. of atoms g of sodium or 100 g of iron. (Atomic mass of Na = 23u, Fe = 56u) Q9. Give the names of the elements present in the following compounds a. Baking Powder b. Quick Lime Q10. If one mole of oxygen atom weighs 16g, what is the mass in g of 1 atom of oxygen? 3 Marks Questions Q11. Convert into mole: a. 22 g of CO2
2 b. 12 g of oxygen gas Q12. Calculate the number of molecules of Sulphur (S 8 ) present in 16 g of solid sulphur. Q13. Calculate the number of aluminum ions present in 0.051g of aluminum oxide. Q14. State the law of conservation of mass? What mass of silver Nitrate will react with 5.85g of sodium chloride to produce g of silver chloride and 8.5 g of sodium Nitrate if law of conservation of mass is true? 5 Marks Questions Q15. What is Dalton s Atomic theory? Give its advantages and drawbacks. Q16. Define mole. Give its symbol. Also define molar mass. UNIT 2: Work & Energy 1 Marks Questions Q1. What is the work done when a body is moved horizontally along a frictionless surface? Q2. Define 1 Joule. Q3. What is the work done on a body moving in a circular path? Q4. When is work said to be done against the force of gravity? Q5. Define 1 watt. Q6. What is kinetic energy? Q7. What will happen to the Kinetic Energy of a body if its velocity is doubled? Q8. Name four units of energy. Q9. In a tug of war, one team gives way to other. What work is being done and by whom? 2 Marks Questions.
3 Q10. Name the transformation of energy involved in these casesa. Electric Heater b. Dynamo c. Microphone d. Electric Cell e. Headphone f. Photoelectric Cell g. When Coal burns Q11. A person holds a body of mass 20 kg over his head for 10 sec. Has he done any work? Justify your answer. Q12. A free falling body stops on reaching the ground. What happens to its kinetic energy? Q13. How are K.E. and momentum related? Q14. Is it possible that a body be in accelerated motion under a force and no work is being done by the force? Q15. When an arrow is shot from its bow, it has K.E. From where does it get the K.E.? 3 Mark Questions (Numerical) Q16. A force acting on a 20 kg mass changes its velocity from 5m/s to 2 m/s. Calculate the work done. Q17. The K.E. of an object of mass m moving with a velocity of 5m/s is 25 J. What will be its K.E. when its velocity is doubled? What will be its K.E when its velocity is increased 3 times? Q18. An object of mass 12 Kg is at a certain height above the ground. If the gravitational P.E. is 480 J, find the height at which the object is w.r.t the ground (g= 10m/s 2 ) Q19. An object of mass 40 kg is raised to a height 5 m above the ground. What is its P.E.? If object is allowed to fall, find its K.E. just before touching the ground and also its K.E. when it is half way down.
4 Q20. What is the work done to increase the velocity of car from 36 km/h to 72km/h, if the mass = 1500Kg. Q21. A man whose mass is 50 kg climbs up 30 steps of a stair in 30 s. If each step is 20 cm high, calculate the power used in climbing stairs. 5 Marks Questions Q22. Deduce a formula for K.E of a body. Q23. State the law of conservations of energy. Show that when a body falls from a height the total mechanical energy remains same. M.C.Q. (1 mark each) Q24. P.E. of a person is maximum when he is - A. standing B. sitting on a chair C. sitting on the ground D. lying down on the ground Q25. Work done by moon in moving around earth- A. +ve B. -ve C. zero D. unknown Q26. Work is measured as product of- A. Force and time B. Force and displacement C. Power and displacement D. Force and acceleration Q27. Value of g is - A. 9.8 m/s
5 B. 9.8 cm/s 2 C. 9.8 m/s 2 D. 9.8 cm/s Q28. If mass if the body is doubled, Kinetic energy will be - A. same B. halved C. doubled D. four times Q29. This is not unit of work - A. Joule B. N.M. C. Kilowatt-sec D. Dyne UNIT 3: SOUND 1 Mark Questions Q1. Which sound has a higher pitch, guitar or car horn? Q2. Name three animals which can hear ultrasonic vibrations. Q3. How are the wavelength and frequency of a sound related to its speed? Q4. Why sound wave is called a longitudinal wave? Q5. Frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute? Q6. What is an echo? Q7.What do waves transport - matter or energy? Q8. What is a wave? Q9. Which characteristics of the sound help us to identify a person by his voice if he is sitting in a dark room?
6 Q10. If the amplitude of a wave is doubled, what will be the effect on its loudness? 2 Marks Questions Q11. Which wave property determines a) loudness, b) Pitch? Q12. Why are the ceilings of concert halls curved? Q13. How is ultrasound used for cleaning? Q14. Sound is produced due to a vibratory motion, then why a vibrating pendulum does not produce sound? Q15. A sound produces 20 crests and 20 troughs in 0.4 sec. Find the frequency of the wave. Q16. Why sound waves are called mechanical waves? 3 Marks Questions Q17. How is sound produced in school bell? Q18. Bats have no eyes then how do they catch their prey? Q19. What is SONAR? Q20. Write three uses of multiple reflection of sound. 3 Marks Questions (Numerical) Q21. Calculate the wavelength of a sound whose frequency is 220 Hz and speed is 440 in a given medium. Q22. A body is vibrating 6000 times is 1 minute. If the velocity of sound in air is 360 m/s, find (i) Frequency in Hz (ii) wavelength of sound.
7 Q23. A stone is dropped from a 500 m tall building into a pond. When is sound splash heard? Given g=10 m/s 2, speed of sound = 340 m/s. Q24. An echo is heard in 3 sec after the emission of sound. If speed of sound in air is 342 m/s, what is the distance of the reflecting surface from the source? M.C.Q. (1 Mark each) Q25. For reflection of sound wave, we need - A. A polished mirror B. A large size, opaque reflecting surface C. A concave surface D. A glass plate Q26. The speed of sound in air is - A. Less than in solids & liquids B. Same as that in solids & liquids C. Greater than in solids and liquids D. None of these Q27. We can sense a compression in a spring if- A. Turns are close together B. Neither closes nor apart C. Turns are further apart than normal D. None of these Q28. When sound is allowed to fall normally on the reflecting surface, the angle at which the intensity of sound will be maximum is: A B C D. 0 0 Q29. The mechanical wave is A. Sound Wave B. Microwave
8 C. Radio Wave D. Light Wave Q30. Sound wave cannot pass through A. Metals B. Water C. Air D. Vacuum Q31. The persistence of sound is an auditorium is the results of A. Single reflection of sound B. Repeated reflection of sound C. Repeated refraction of sound D. Vibration of object placed in an auditorium Q32.A wave set up a single disturbance of short duration is called A. A pulse B. Sound Wave C. A Wave D. None of these Q33. To determine the velocity of a pulse propagated through a stretched slinky A. A slight jerk is given to the slinky B. No jerk is given to the slinky C. Sharp jerk is given to the slinky D. None of these. Q34. The distance x in below diagram is- A. λ B. 2λ C. 3λ/2 D. λ/2
9 Q35. Two sounds of same pitch and loudness differ in A. Tone B. Note C. Quality D. All of these UNIT 5: Structure of Atom 1 Marks Questions Q1. In television picture tube which type of rays are used? Q2. Which is heavier, neutron or proton? Q3. If electrons move from K to L shell, will the energy be absorbed or evolved? Q4. Give one point of similarity and one difference between and. Q5. Helium atom has an atomic mass of 4u and two protons in its nucleus. How many neutrons does it have? 2 Marks Questions Q6. An ion X 2+ contains 18 electrons and 20 neutrons. Calculate the atomic number and mass no. of element X. Name the element X. Q7. In a given electric field, β- particles are deflected more than α- particles inspite of the fact that α - particles have larger charge, why?
10 Q8. Give one Achievement and one limitation of J.J Thomson s model of atom? Q9. If Bromine atom is in the form of two isotope (49.7 %) and (50.35%) then find mass of Br atom. 3 Marks Questions Q10. What are valence electrons? What is their significance? Q11. What would be the observation if the α - particle scattering experiment is carried out using a foil of a metal other than gold? Q12. Electronic configuration of Potassium is 2,8,8,1 and Calcium 2,8,8,2, when M shell can have maximum of 18 electrons then why next element Scandium has electronic configuration 2,8,9,2 and not 2,8,8,3? Q13.What are isotopes and Isobars? What are two isotopes of chlorine?calculate the average atomic mass of a chlorine atom? 5 Marks Questions Q14. What is present concept of an atom? Explain in detail? Why this model is considered to be the most appropriate model? Q15. Explain the Rutherford s alpha particle scattering experiment. What were the main conclusions drawn from this experiment?
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