Karnatak University 2006 SCIENCE — I ( Physics

28. When an electron jumps from the higher energy level to the lower energy level the
difference in the energy is released in the form of
(A) atoms (B) protons
(C) molecules (D) photons.
29. The electromagnetic radiations produced by a red hot iron are
(A) radio and infrared (B) radio and visible
(C) infrared and visible (D) infrared and ultraviolet.
30. The natural resource that is current in the atmosphere in element form is
(A) hydrogen (B) nitrogen
(C) chlorine (D) carbon dioxide.
31. Coke is used in the blast furnace to decrease
(A) iron oxide (B) silicon dioxide
(C)magnesium oxide (D) calcium oxide.
32. The accurate formula that indicates the action of dilute sulphuric acid with zinc is
(A) Zn + H two SO four ? ZnSO four + H two ?
(B) Zn + H two SO four ? ZnS + H two O
(C) Zn + H two SO four ? ZnO + H two S
(D) Zn + H two SO four ? ZnSO four + H two O.
33. The metal that can be extracted from the ore magnetite is
(A) iron (B) copper
(C) aluminium (D) magnesium.
34. If you want to remove the colour stain from a material, you can choose
(A) washing soda (B) bleaching powder
(C) baking soda (D) gypsum.
35. Which of the subsequent petroleum products is generally used for cars ?
(A) gasoline (B) paraffin wax
(C) kerosine (D) gas oil.
36. The molecular formula of saturated hydrocarbon with 8 carbon atoms is
(A) C eight H eight (B) C eight H 18
(C) C eight H 16 (D) C eight H 14 .
37. The compound found by the fermentation of cane sugar is
(A) ethanol (B) formaldehyde
(C) freons (D) polymers.
38. A solution in which the maximum volume of solute is dissolved in provided temperature
is
(A) unsaturated (B) colloidal
(C) saturated (D) suspension.
39. Which of the subsequent resources can be recycled ?
(A) Petrol (B) Coal
(C) Petroleum gas (D) Water.
40. Which 1 of the subsequent helps to conserve water ?
(A) Tubewells (B) Soil erosion
(C)Water pollution (D) Afforestation.
PART – B
41. Why is the atmospheric temperature of Venus high ? 2
42. a) What is a galaxy ?
b) Name the galaxy in which solar system is obtained. 2
43.Draw a neat sketch of single stage rocket and tag any 2 parts.
44. obtain the efficiency of an engine which converts 200 kJ of heat energy into work
when 800 kJ of heat is supplied. 2
45. a) What is superphosphate of lime ?
b) How is superphosphate prepared ? 2
46. a) What kind of bond made water a liquid ?
b) Why is oxygen passed through water during water treatment ?
47. Write any 3 advantages of biogas plant to a farmer. 3
48. a) What is radioactivity ?
b) Write any 1 property every of (i) alpha particles (ii) beta particles. 3
49. a) What is meant by catenation ?
b) Write the covalent structures of methane and propane.
50. a) Draw a neat sketch of the device used in the extraction of aluminium. tag any
two parts.
b) Name the anode and cathode used in the above process.

Earning:   Approval pending.