KRISHNARAJANAGAR TALUK LEVEL PREPARATARY EXAMINATIONS 2018-19
SCIENCE QUESTION PAPER
10th STANDARD
TIMINGS 2Hrs &30 Min.] [ Max Marks 80
Four alternatives are given to each of the following incomplete statements. Choose the most appropriate one and write it in your answer book. 1 X 10 = 10
1. If 4 amperes of current flows though the conductor for 4 minutes, then the amount of electric charges is
A) 8 coulombs B) 80 coulombs C) 480 coulombs D) 48 coulombs
2. The material used to prevent the oxidation in chips packet is
A) Oxygen B) Nitrogen C) Hydrogen D) Chlorine
3. In the spectrum obtained by the dispersion of light the color found in the middle of the spectrum is
A) Green B) Blue C) Red D) Violet
4. The characteristic of the analogous organs is
A) Same structure and function B) Same structure but different function
C) Different structure and function D) Different structure but same function.
5. Which of the following substance gives salt and water when reacts with both acids and bases
A) Fe2O3 B) MgO C) CaO D) Al2O3
6. The reason for myopia or short sightedness is
A) The nearer point is more than 25cm B) The larger far point
C) The image forms in front of retina D) The image forms on retina
7. Which of the following reproduction process introduces large number of variations?
A) Cross pollination B) Self pollination C) multiple fission D) Spore formation
8. Which of the following statement is wrong with respect to bases?
A) They turn red litmus into blue B) They forms purple color in phenolphthalein solution
C) They form salt and water when reacted with acids D) They have large number of hydrogen ions
9. Choose the correct statement “When light passes from denser medium to rarer medium”
A) Angle of incident and angle of refraction are same
B) The angle of incident is more than the angle of refraction
C) The angle of incident is lesser than the angle of refraction
D) None of the above.
10. Which of the following is not right in managing natural resources?
A) Installing large number of thermal power plants
B) Using more public transport
C) Maintaining rain water harvesting
D) Reusing the materials as much as possible.
11. MATCH THE FOLLOWING 4 x 1 = 4
1. Controls involuntary functions A) Medulla
2. regulates the glucose level in blood B) Abscisic acid
3. Controls posture and balance of the body C) Insulin
4. Prevents the growth in plants D) Cerebellum
E) Auxins
F) Adrenaline
G) Cerebrum
ANSWER THE FOLLOWING QUESTIONS. 1 x 7 = 7
12. Why convex mirror is used as the rear view mirror in vehicles instead of plane mirrors?
13. State Mendal’l law of dominance
14. Why curd and sour fruits should not be stored in metallic vessels.
15. How the movement of leaves of touch-me-not plant is differ from the movement of the stem towards light?
16. The sky appears to be black to astronauts. Why?
17. What are redox reactions?
18. What is lymph?
TWO MARKS QUESTIONS. 2 x 16 = 32
19. An electric iron box uses 840W energy at the maximum temperature. If the potential difference of the circuit is 220V then calculate the current flows through it.
20. Write the two types of the breaking down of glucose during the anaerobic respiration process.
OR
Explain the water transport process through xylem tissue.
21. Draw the neat diagram of the electric motor.
22. What is far sightedness? How can it be corrected?
23. What are the effects caused by the depletion of ozone layer?
24. What is the resistance of a conductor? Name the factors on which the resistance of a conductor depends.
OR
Differentiate between the series and parallel connections of resistors.
25. Draw the electric circuit used in the experiment to verify Ohm’s law.
26. Draw the neat diagram of the arrangement of the materials used to examine the conductivity of acids.
27. How bleaching powder is produced? Explain with the equation.
28. Draw the neat diagram of the germination of pollen grain on stigma of the flower.
29. What is placenta? What are its functions?
30. State the properties of ionic compounds.
OR
Explain the ionic bond formation in sodium chloride molecule.
31. Balance the following equations.
A) NaOH + H2SO4 Na2SO4 + H2O
B) HNO3 + Ca(OH)2 Ca(NO3)2 + H2O
OR
Write the balanced chemical equation for the following chemical reactions.
A) Calcium hydroxide + Carbon dioxide Calcium carbonate + Water
B) Barium chloride + Potassium sulphate Barium sulphate + potassium chloride
32. Suggest some environmental friendly habits that you may adopt in your life for the management of natural resources.
33. Draw the ray diagram of image formation when the object is placed on the centre of curvature (C) of a concave mirror
34. Define A) Esterification B) Saponification
OR
What are functional groups? Mention the functional groups present in ethanol and ethanoic acid.
THREE MARKS QUESTIONS. 3 x 5 = 15
35. Draw the neat labeled diagram of the longitudinal section of the human heart.
36. What is the refraction of the light? State the laws of the refraction of light.
OR
Define the following. A) Power of a lens B) One Dioptre C) Refractive index.
37. Write the disadvantages or problems associated with the construction of high rise dams.
OR
How the nuclear energy is different from the other sources of energy? Why environmentalists oppose the use of nuclear energy.
38. A) What is ionic radius? How it changes along the perion and down the group of the periodic table.
B) Give reason why the metallic property of elements increased down the group.
39. Write the diagram of the experiment of the electrolysis of the water. Write the balanced chemical equation of this reaction.
FOUR MARKS QUESTIONS. 4 x 3 =12
40. A) Explain sex determination in man
B) What are fossils?
OR
A) What are homologous and analogous organs?
B) Why the character acquired by an organism will not be inherited?
41. A) What is substitution reaction? Explain with an example.
B) Define these. A) Catenation B) Isomerism
42. A) What is electromagnetic induction?
B) What happens when a current carrying conductor is placed in the magnetic field?
C) How a solenoid acts as a bar magnet.
D) State the Cork screw law of Maxwell.