1. Give one example of two miscible liquids where distillation can be used for separating them.

2. Defineixture.
                                 OR
What is solute and solvent in brass?
3. The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion ? 
                                 OR
Write the Electronic configuration of Mg2+ ion.
4. Define the law of constant proportion.
5. Helium atom has 2 electrons in its valence shell but its valency is not 2. Explain.
                                 OR
According to Bohr and Bury scheme what is the maximum number of electrons present in M- shell of an atom? 
6. What is sedimentation?
7. Write the chemical formula of calcium oxide.
                                OR
In ammonia, nitrogen and hydrogen are always present in the ratio 14 : 3 by mass. State the law
which explains the above statement.
8. Name the organelle other than nucleus of a cell, which contains DNA.
9. Name the water conducting tissue present in gymnosperms.10. Name the disease transmitted by animal bite.
11. A coolie is walking on a railway platform with a load of 30 kg on his head. How much work is done by coolie? 
12. How many Ag atoms are there in 0.0001 gram of Ag. Molar mass of Ag is 108 gram per mole.  
13. If the time interval between lightning and thunder is 2 seconds, what is the distance of the point of lightning. (Speed of sound in air is 346 ms-1 
                                 OR
Name the quantity which is measured by the area occupied below the velocity - time graph. For question numbers 14-16, two statements are given- one labelled Assertion (A) and the  other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b),  (c) and (d) as given below:  
(a) Both A and R are true and R is correct explanation of the assertion.
(b) Both A and R are true but R is not the correct explanation of the assertion.
(c) A is true, but R is false.
(d) A is false, but R is true.
14. Assertion: Thigh muscles can get tired but not heart muscles.
Reason: Muscles of thigh are voluntary while muscles of heart are involuntary muscles.
15. Assertion: If a balanced force is applied on a wooden block it will move.
Reason: Unbalanced force changes the state of motion or rest while balanced force does not.
16. Assertion: Muscle fibers are contractile in nature.
Reason: Cells of muscle tissue can shorten forcefully and again return to the relaxed state.
                                   OR
Assertion: Permanent tissue is composed of mature cells.
Reason: Meristematic tissue is a group of actively dividing cells.
Answer Q. No 17 - 20 contain five sub-parts each. You are expected to answer any four subparts in these questions.  
17. Read the following and answer any four questions from 17(i) to 17(v).
The graph shows the distance-time graph of three objects A, B and C. Study the graph and answers the following questions:  
(i) Which of the three is travelling the fastest?
(a) C (b) A (c) B (d) All are at equal speed(ii) One of the following is not a vector quantity. This one is :
(a) displacement (b) speed (c) acceleration (d) velocity
(iii) How far has B travelled in 1.4 hours? 
(a) B travelled from 5 to 12 km in 1.4 hours. (b) B travelled from 1 to 12 km in 1.4 hours. 
(c) B travelled from 4 to 12 km in 1.4 hours. (d) B travelled from 0 to 12 km in 1.4 hours. 
(iv) How far has C travelled in 1.6 hours? 
(a) C travelled from 8 to 12 km in 1.6 hours. (b) C travelled from 2 to 12 km in 1.6 hours. 
(c) C travelled from 0 to 12 km in 1.6 hours. (d) C travelled from 1 to 12 km in 1.6 hours. 
(v) State the formula used to find out speed from distance time graph. 
(a) Speed = Time / Distance (b) Speed = Distance x Time 
(c) Speed = Distance/Time (d) Time = Speed x Distance 
18. Read the following and answer any four questions from 18(i) to 18(v). 
In order to overcome the objections raised against Rutherford's model of the atom, Neil Bohr put forward the following postulates about the model of an atom. Only certain special orbits known as discrete orbits of electrons are allowed inside the atom. While revolving in discrete orbits the electrons do not radiate energy.These orbits or shells are called energy levels.
(i) Atoms are made up of _________, __________ and __________ .
(a) electrons, protons, neutrons (b) cations, anions, charges 
(c) positive charges, negative charges, bonds (d) ions, orbits, molecules 
(ii) Who amended Rutherford's shortcomings? 
(a) Dalton (b) Neil Bohr (c) J.J. Thomson (d) E. Goldstein 
(iii) Name the number of electrons that K shell and L shell can accommodate. 
(a) 8, 8 respectively. (b) 2, 8 respectively. (c) 1, 8 respectively. (d) 5, 10 respectively. 
(iv) Rutherford’s alpha particle scattering experiment led to the discovery of :
(a) Nucleus (b) Electrons (c) Protons (d) Neutrons 
(v) Where is the positive charge located inside the atom? 
(a) Orbit (b) Ion (c) Nucleus (d) Neutron 
19. Read the following and answer any four questions from 18(i) to 18(v). 
Bacteria are unicellular organisms belonging to the prokaryotic group where the organisms lack a few organelles and a true nucleus. Study the given diagram of bacterial cell and answer the following questions.                                                                                                                                               20. Read the following and answer any four questions from 20(i) to 20(v).  Bone is a solid, hard porous tissue. It forms the natural skeleton and gives the body its basic  structure and also supports the body. Its matrix is impregnated with phosphates and carbonates of  calcium and magnesium which provides hardness to it. The matrix also contains ossein protein.  The matrix is arranged in concentric rings which are called lamellae. Bone cells lie between the  lamellae in fluid-filled spaces called lacunae. Bone cells are also called osteocytes.   
            (i) What are bone cells also called ?
(a) Lacunae (b) Osteocytes (c) Neutrophils (d) Erythrocytes  
(ii) The matrix inside the bone is arranged in concentric rings called __________
(a) Cytoplasm (b) Osteocyte (c) Lacunae (d) Lamellae
(iii) To form natural skeleton and to give support to the body is the main function of __________
(a) Cells (b) Muscles (c) Bones (d) Ligaments
(iv) The matrix of bone is impregnated with _____________
(a) Carbon dioxide and oxygen (b) Carbon dioxide and water
(c) Sulphates of sodium (d) phosphates and carbonates of calcium and magnesium
(v) Bone cells lie between the lamellae in fluid-filled spaces called ___________
(a) lamina (b) osteocytes (c) lacunae (d) ossein
                           SECTION – B
21. (a) Define polyatomic ion. (b) Write the name of the compound (NH4)2SO4. 
22. (a) Write two points of difference between nuclear region of a bacterial cell and nuclear region of an animal cell. 
(b) Which structure present in the nuclear region of a living cell bear genes?
23. A body covers one complete revolution around a circular park of circumference 176 m in 4 minutes. Find the displacement of the body after 6 minutes.  
                                 OR
A mechanic strikes a nail with hammer moving with a velocity of 20 m/s. The hammer comes to rest in 0.02 s after striking the nail. Calculate the acceleration of the nail.  
24. (a) When is the work done by a body said to be negative?
(b) An object of mass 5 kg is dropped from a height of 10 m. Find its kinetic energy, when it is half way down. 
25. An atom of an element has 7 electrons in its L shell.
(a) What is its atomic number?
(b) State its valency.
(c) Identify the element.
26. When two bodies X and Y collide with each other, X exerts a force of 5 N on Y towards east direction. What is the force exerted by Y on X ? Justify your answer stating the law.  
                                 OR
A circular groove is provided in a saucer for placing the tea cup in it. Give reasons.
                             SECTION – C
27. Define atomicity. Give an example of each of monoatomic, diatomic, tetra-atomic and polyatomic molecules 
29. (i) A ball is allowed to roll down from an inclined plane. It reaches the foot of the plane and continues to roll on the ground. It stops after travelling some distance. Is this the violation of law of inertia? 
(ii) Give reasons for following. Glass wares are wrapped in straw during their transportation. 30. A ball is dropped from the top of a tower 100 m high and at the same time another ball is projected vertically upwards from the ground with a velocity of 25 m/sec. Calculate where and when the two stones will meet. (Take g = 9.8 ms-2 )  
                                 OR
What happens to the magnitude of the force of gravitation between two objects if: (i) mass of one of the objects is tripled ? (ii) distance between the objects is doubled ? (iii) mass of both objects is doubled ? 
31. Draw a neat and well labelled diagram of a typical prokaryotic cell.
32. (a) Define atomic mass unit.
(b) Distinguish between molecular mass and molar mass.
(c) Give an example of
(i) diatomic, and
(ii) triatomic molecule of compounds.
33. A body of mass 5 kg is thrown vertically upwards with a speed of 10 m/s. What is its kinetic energy when it is thrown? Find its potential energy when it reaches at the highest point. Also find  the maximum height attained by the body. (g = 10 m/s2 )\
35. (a) Earth revolves around sun due to the gravity of sun. Why does the earth not move towards sun? 
(b) State and derive the formula for gravitational force of attraction between sun and earth.
(a) A metallic bar has a mass 200 g at poles. Does it change when taken to equator?
                                 OR
(b) Does its weight change when brought to equator? If yes, how?
(c) Where on earth will the weight be zero?
(d) What would happen if there was no acceleration due to gravity?
36. (a) List any four properties of a colloid and mention any two properties in which colloids differ from suspension. 
(b) State what is Tyndall effect? Which of the following solutions will show Tyndall effect?
Starch solution, sodium chloride solution, Tincture iodine, air.
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