ARAVALI INTERNATIONAL SCHOOL Holiday Homework CLASS:IX SUBJECT:PHYSICS(MOTION) Q1.Define uniform motion. Q2.Differentiate between(i) distance and
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1 Holiday Homework CLASS:IX SUBJECT:PHYSICS(MOTION) Q1.Define uniform motion. Q2.Differentiate between(i) distance and displacement (ii)speed and velocity Q3.What does the slope of a velocity- time graph represent? Q4.Name the quantity which is measured by the area occupied below the velocity time graph? Q5.A bus covers equal distances in equal intervals of time. What type of motion does the bus exhibit? Q6.What is the nature of the distance-time graph for objects moving with uniform speed? Q7.What can you say about the motion of an object whose distance-time graph is: a)a straight line parallel to the time axis b)a straight line passing through the origin making an angle from the time axis Q8.Name the physical quantities denoted by: a)the slope of the distance-time graph b)the area under velocity-time graph Q9.Draw the distance-time graph for the following a)when a body is stationary b)when a body is moving with a uniform speed Q10.Can an object have constant speed and still be accelerating? Give an example. Q11.If the speed of an object is zero, its velocity must also be zero. Do you agree with this statement? Q12.Derive graphically three equations of motion, where symbols have their usual meaning. Q13.An athlete completes one round of a circular track of diameter 49m in 20s.Calculate the distance covered and displacement at the end of 30s. Q14.While driving Jayant travels 30km with a uniform speed of 40km/h and next 30km with a uniform speed of 20km/h.Find his average speed. Q15.A girl while riding a bicycle moves with the speed of 10km/h for 2hours and with the speed of 15km/h for the next 3 hours.find the total distance moved by her and her average speed. Q16.An aeroplane starts from rest with an acceleration of 3 meters per second square and takes a run off? Q17.Atrolley while going down an inclined plane has an acceleration of 2cm per second square. What will be its velocity 3s after the start? Q18.A racing car has a uniform acceleration of 4m per second square. What distance will it cover in 10s after the start? Q19.A train starting from a railway station and moving with uniform acceleration attains a speed40km/h in 10 minutrs. Find its acceleration. Q20.A bus decreases its speed from 80km/h to 60km/h in 5s.Find the acceleration of the bus.
2 ASSIGHMENT - CLASS 9 SUBJECT CHEMISTRY CH ATOMS AND MOLECULES 1) Atoms of inert gas elements are monoatomic while of the other elements are not. Assign reason. 2) What are the limitations of Dalton s atomic theory? 3) What is the difference between Molar mass and molecular mass? 4) How an atom differs from an ion? 5) Which of the following contains more no. of hydrogen atoms Two moles of HCl or one mole of NH 3 6) How many moles are there in 100 g of glucose(c 6 H 12 O 6 ) 7) Define the term mole.explain the necessity of mole?give the relation between a mole, molar mass and Avogadro,s constant. 8) Give the symbols and latin names for following elements- Gold, Copper,Silver,Sodium, Iron 9) Calculate the ratio of molecules present in 6.6 g of CO 2 and 3.2 g of SO 2. 10) What do the following represent 2N, O 2,3H 2 O, O, N 2 11) How a formula unit mass is different from Molecular mass? 12) Define Chemical formula. What is its significance? 13) An element x has valency of 3. What would be formula of its Carbonate and Oxide? 14) Give chemical formulae for the following compoundsa) Sodium sulphate b) Calcium Carbonate c) Hydrogen sulphide d) Carbon tetra chloride. 15) Calculate the mass of Nitrogen gas which contain the same number of molecules as present in 4.4 g of CO 2 16) What are polyatomic ions? Give example of a polyatomic cation and a polyatomic anion. 17) State law of constant proportion. What is the ratio by mass of Nitrogen and Hydrogen in Ammonia? 18) Define atomicity. Give examples of a) A triatomic gas b) A polyatomic element 19) Calculate molecular mass of the following compounds Quick lime, Ethene, Baking powder, Aluminium oxide. 20) Explain significance of symbol O.
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6 Chapter - 5. The Fundamental Unit of Life 1. What are the tenets of cell theory? 2. Why is the cell called the unit of structure and function in a living organism? 3. Is an elephant cell longer than the cell of a rat? Why? 4. Explain why do the smaller cells have better efficiency? 5. How do the new cells arise from the pre existing cells? 6. What is the meaning of division of labour? Is it different from cell to cell? 7. What do you mean by a selectively permeable membrane? 8. Write the composition & function of the cell wall. 9. Define the process of Diffusion. 10. What is the process of Osmosis? 11. Differentiate the terms: (i) Hypotonic (ii) Isotonic (iii) Hypertonic 12. What is that process by which amoeba acquires its food? 13. Draw the figure of an onion peel showing cells 14. Classify the living organism on the basis of number of cells they have. 15. Draw the figure of various types of cells present in a human body. 16. Give the composition and structure of a unit membrane.
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