Friday, September 14, 2012


1. An unlit incense stick (agarbatti) gives smell only when we come close to it but on lighting the stick we get smell even far away from it, why?
2. If the mass of a body is doubled what will happen to its acceleration, if the applied force remains constant ?
3. Name the processes by which CO2 and H2O move into and out of a cell ?
4. Tabulate any two differences between mixtures and compounds
5. Mention any two phenomena which can be successfully explained on the basis of   Universal law of gravitation.
6. What is meant by endocytosis ? Name an organism which uses this process.
7. Mention two functions of stomata.
8. (a) Draw a labeled diagram of the apparatus used to separate a mixture of oil and   water. Write name of this apparatus.
(b) State any two other applications of the technique used in this apparatus.
9. A particle moves 3m north, then 4m east and finally 6m south. Calculate the displacement. Also calculate the distance travelled by the particle ?
10. (a) Give reasons for the following.
 (i) It is advised to tie the luggage kept on the roof of a bus with a rope.
 (ii) A gun recoils after it is fired.
(b) Define momentum of an object.
11. What happens to the gravitational force between two objects when the :
(a) mass of one object is doubled.
 (b) distance between the objects is tripled.
(c) masses of both objects are doubled and the distance between them is tripled.
12. State the action and reaction in the following :
 (a) moving rocket
(b) firing of a bullet from a gun
(c) a person walking on the floor.
13. (a) What is meant by acceleration due to gravity ?
 (b) Planet Venus has radius one half of the Earth and mass 1/9th of the Earth. Find the value of g on the surface of Venus. (given, value of g on surface of Earth(59.8m/s2 )
14. (a) Draw the adipose connective tissue.
(b) Mention one region in the body where this tissue is present and state one function of this tissue.
15. (a) Draw a labeled diagram of a neuron. (Two labeling)
(b) Identify the tissue which is made up of these cells.
(c) Name one organ that is made of this tissue.
16. Describe the structure and write any two functions of the Golgi apparatus.
17. (a) What are macronutrients ? Why are they called macronutrients ?
(b) From where do plants acquire the following nutrients : (i) Nitrogen (ii) Hydrogen
18. Why should fertilisers be applied in proper dose and at proper time ?
19. Name and describe the method used for separating the components present in a   sample of ink. List its any two applications.
20. (a) How can we separate a mixture of two miscible liquids ?
(b) Draw a neat labeled diagram of the apparatus used for separating acetone and water (forming a miscible mixture) from their mixture.
(c) Can all mixtures of two or more miscible liquids be separated by this process?
(d) List two criteria needed for using this process ?
21. (a) Differentiate between three states of matter on the basis of following properties.
 (i) intermolecular forces. (ii) Arrangement of molecules.
(b) Liquids generally have lower density compared to solids. But you must have observed that ice floats on water. Give reason.
22. (a) What temperature in Kelvin scale is equal to 50 0C ?
(b) Describe an activity to show that rate of evaporation increases with surface area.
(c) State two differences between evaporation and boiling.
23. (a) What happens to a person travelling in a bus when the bus takes a sharp turn ? Give reason.
(b) A cricketer moves his hands backwards on catching a fast moving ball. Why ?
(c) A bullet of mass 0.02 kg is fired by a gun of mass 20 kg. If the speed of the bullet is 150 ms21, calculate the recoil speed of the gun ?
24. If the mass of a body is doubled, what happens to its acceleration when acted upon by the same force ? Justify your answer.
(b) It is easier to stop a tennis ball than a cricket ball moving with the same speed. Why ?
 (c) A girl of mass 40 kg jumps with a horizontal velocity of 5 ms21 on to a stationarycart with frictionless wheels. The mass of the cart is 10 kg. Find her velocity as the cart starts moving. Assume that there is no external unbalanced force working in the horizontal direction.
25. List two difference in tabular form between speed and velocity. When is a body said to have :  (a) uniform velocity and (b) variable velocity. How is the average velocity of a body calculated when its velocity changes at a non uniform rate ?
26. A train starting from rest, pick up a speed of 10m/s in 100s. It continues to move at the same speed for the next 250s. It is then brought to rest in the next 50s. Plot a speed – time graph for
27. Mention the different methods of growing crops to get maximum produce. Give one example of each method. List the factors which are taken into consideration while deciding the choice of crops for each method.
28. Differentiate between capture fishing and culture fishery. Explain the advantage of composite fish culture with example. State the problems faced on adopting composite fish culture and also the solution found to solve it.
29. (a) Define the following properties of matter – (i) rigidity (ii) diffusion (iii) compressibility (b) Arrange solids, liquids and gases in the ascending order as regards the extent to which each of the above properties is exhibited them.
(c) Write any one example from your daily life experience which is based on diffusion   of gases.
30. (a) When a motor car makes a sharp turn at a high speed, we tend to get thrown to one side. Why ?
(b) State Newton’s 1st and 3rd law of motion.
(c) A force of 5N gives a body of mass ‘m’ an acceleration of 10m/s2, Calculate the mass of the body in grams.

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