SINGHANIA UNIVERSITYBSC AIRCRAFT MAINTENANCE ENGINEERING

VI SEM MODEL QUESTION PAPERSubject: CHEMISTRYPaper Code: CHE-103

M.M- 50TIME-1hr

1. ATTEMPT ALL QUESTIONS.2. ALL QUESTIONS CARRY EQUAL MARKS.

1. The nucleus of the atom consists of ( a )a) Proton and Neutron b) Proton and Electron

c) Neutron and Electron d) Proton, Neutron and Electron

2. Charge of the Electron ( b )a) 0 b) -1 c) +1 d) +

3. Atomic number is defined as ( d )a) Number of neutrons b) Number of Electronsc) Sum of the protons and electrons d) Total number of +ve charges

4. Mass of neutron is ------ times of the mass of electron ( a )a)1840 b) 1480 c) 200 d) None of the above

5. Positive rays were discovered by ( a )a) Thomson b) Aston c) Gold Stain d) Bragg

6. Who introduced the concept of electron spin ( d )a) Schrodinger b) Planck c) Bohr d) Uhlenbeck and Goldsmith

7. An P orbital accommodate ( b )a) 4 Electrons b) 6 Electrons c) 8 Electrons d) 3 Electrons

8. Mass number represents the number of its ( b )a) Protons only b) Protons and neutronsc) Protons and Electrons d) Neutrons and Electrons

9. Principal, azimutal, and the magnetic quantum numbers are respectively related to ( a )a) Size, Shape and orientation b) Shape, size and orientationc) Size, orientation and Size d) None of the above

10. Which set of quantum numbers are wrong? ( a )a) n = 2, l = 1, m=o, S= + b) n = 2, l = 2, m=o, S= + c) n = 3, l = 2, m=o, S= + d) n = 3, l = 2, m=o, S= +

11. Strongest acid in the following is ( b )a) HF b) HCl c) HBr d) HI

12. According Lewis concept acid is ( b )a) Electron Pair donor b) Proton donorb) Proton acceptor d) Electron Pair acceptor

13. Enthalpy is for endothermic reaction ( a )a) H = +Ve b) H = -Ve c) H = O d) All the above

14. The reaction is at equilibrium ( c )a) G> 0 b) G

20. Isomer of ethanoic acid is ( a )a) Methyl methanol b) Methyl ethanolc) Ethyl Ethanol d) butyl Ethanol

21. Units of Faradays are ( c )a) Amperes b) C c) C mole -1 d) C. Sec -1

22. 1 Kilo watt hour (1 KWH) is equal to ( a )a) 3.6 x 10 6J b) 3.6 x 10-6J c) 3.5 x 105J d) 3.5 x 10-5J

23. In Daniall cell the changes that take place at copper electrode and zinc electrode respectively ( b )a) Oxidation, Reduction b) Reduction, Oxidationc) Oxidation, Oxidation d) Reduction, Reduction

24. A fertile soil is likely to have a PH of ( c )a) 3 b) 9 c) 6-7 d) 14

25. The lowest layer of Earths atmosphere is ( a )a) Troposphere b) Strato Sphere c) Mesosphere d) Inosphere

26. Hormful chemical present in tobacco is ( a )a) Nicotine b) Atropine c) Tannic Acid d) Morphine

27. What is shape of water molecule ( c )a) Angular b) Linear c) V- shape d) None of there

28. Which of the following is man-made source of air pollution ( a )a) Automobile Exhaust b) Forest firec) Bacterial action in soil and swamp areas d) All the above

29. Which of the following is present in maximum amount in acid rain ( b )a) HNO3 b) H2SO4 c) HCl d) H2CO3

30.Ozone layer is present in ( b )a) Troposphere b) Strato Spherec) Meso Sphere d) Exosphere

31. Magnetic quantum number was proposed by ( b)a) Bohr b) Lande c) Sommer field d) mostely

32. Significance of spin quantum number ( d )a) To describe shape b) Size and energyc) Orientation d) Spinning of the orbital

33. What is the symbol of vanadium ( b )a) Ti b) V c) Cr d) SC

34. Electronic configuration of Na (c )a) 1S2 2S2 2P6 3S2 b) ) 1S2 2S2 2P6 3S2 3P1c) ) 1S2 2S2 2P6 3S1 d) ) 1S2 2S2 2P6

35. Water melon model of atom was proposed by ( b )a. Rutherford b. Thomson c. Bhor d. Sommer feld

36. The SI unit for frequency ( ) is ( b )a. Cycles / sec b. Hz / hertz c. cm -1 d. m -1

37. What is the value of Plancks constant ( a )a. 6.626 x 10-34 J-s b. 6.2 x 10-34 calc. 6.625 x 1027 cal d. All

38. Sodium hydroxide is a ( b )a. Acid b. Base c. Neutral d. None

39. H = (+) positive, heat is absorbed the reaction is ( c )a. Exothermic reaction b. oxidationc. Endothermic reaction d. Reduction

40. Faradays first law representation (b )a. = c b. Q = Ix F c. E = Q x V d. b and c

41. Shape of methane molecule is ( c )a. V- Shape b. Txigonal planar c. Tetrahedral d. Square planar

42. Molecular formula of ozone is ( d )a.O2 b.O- c. O-2 d. O3

43. The product of pressure and volume ( PV ) has a unt of (b)a. impulse b. energy or work c. entropy d. force

44. When the temperature is increased, surface tension of water ( b )a. Increases b. Decreases c. Remains Constant d. Shows irregular behavior

45. Number of Neutrons in proton ( b )a. 1 b. 0 c. 2 d. -1

46. Schrdinger equation is ( c )a. = h b. E = mc2 c. H = E d. All

m

47. The number of Vacant orbitals of element with atomic number 14 is (d )a. 2 b. 4 c. 8 d. 6

48. H2 g+ I2 g = 2HIg order of the reaction is ( b )a. 3 b. 2 c. 4 d. 0

49. 2NO(g)+ O 2(g) 2NO2(g) order of reaction is ( c )a. 4 b. 2 c. 3 d.1

50. Molecular formula of formaldehyde ( b )a. CH3 Co CH3 b. HCHO c. CH3 CHo d. C2H5OH

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