PSC Junior Instructor Draftsman Civil Model Questions and Answers

26. A four sided figure having two pairs to sides parallel is called a
(A) Rhomboid
(B) Regular polygon
(C) Pentagon
(D) Trapezoid
Answer: A

27. Eccentricity is always equal to one for
(A) Ellipse
(B) Parabola
(C) Hyperbola
(D) Circle
Answer: B

28. In a drawing letters and numbers are designed by their
(A) Width
(B) Height
(C) Thickness
(D) none of these
Answer: B

29. The angle of miter line is ………….. degrees
(A) 75
(B) 60
(C) 45
(D) 30
Answer: C

30. A solid bounded by twelve equal regular pentagon is known as
(A) Octahedron
(B) Tetrahedron
(C) Icosahedron
(D) Dodecahedron
Answer: D

31. If the smallest division of a Verneir is longer than the smallest division of its primary scale, teh Vernier is known as
(A) Direct Vernier
(B) Double Verneir
(C) Simple Vernier
(D) Retrograde Vernier
Answer: D

32. When a chain is used at a temperature more than the temperature it was calibrated the erorr in measured length will be
(A) Cumulative
(B) Compensative
(C) Negative
(D) Observational error
Answer: A

33. The length of an Engineer’s chain should be
(A) 100 ft
(B) 66 ft
(C) 30 m
(D) 20 m
Answer: A

34. Generally while chaining, the arrow which accompany with one chain must be
(A) 3 nos
(B) 5 nos
(C) 10 nos
(D) 12 nos
Answer: C

35. The difference between the most probable value of a quantity and its observed value is
(A) Conditional error
(B) True error
(C) Residual error
(D) Safe error
Answer: C

36. The base line is measured with
(A) Metallic tape
(B) Steel tape
(C) Invar tape
(D) Chain
Answer: D

37. An offset more than 15 m in length is known as
(A) Long offset
(B) Short offset
(C) Oblique offset
(D) Right-angled offset
Answer: A

38. Which of the following instruments is used for measurements of angles ?
(A) Geodimeter
(B) Tellurometer
(C) Sextant
(D) Telescope
Answer: C

39. The box of prismatic compass is made of
(A) Steel
(B) Brass
(C) Iron
(D) Aluminium
Answer: B

40. The two point and three point problems are methos of
(A) Orientation
(B) Resection
(C) Traversing and resection
(D) Orientation and resection
Answer: D

41. The accuracy of “fix” by two point problems is
(A) Bad
(B) Good
(C) Unique
(D) Not reliable
Answer: D

42. In levelling, the error due to refraction is
(A) Positive
(B) Negative
(C) Compensating
(D) Progressive
Answer: C

43. Levelling across a river is done by
(A) fly levelling
(B) reciprocal levelling
(C) trigonometrical levelling
(D) cross levelling
Answer: B

44. An anallatic lens is
(A) Convex
(B) Concave
(C) Plane
(D) Plano-concave
Answer: A

45. Which method gives more accurate results in the measurements of areas
(A) Mid − ordinate rule
(B) Average − ordinate rule
(C) C. trapezoidal rule
(D) Simpsons rule
Answer: D

46. The colour of a mineral in its powered form is known as
(A) streak
(B) lustre
(C) texture
(D) structure
Answer: A

47. Which of the following is a mineral
(A) Quartzite
(B) Laterite
(C) Granite
(D) Calcite
Answer: D

48. THe minimum hardness number for marble is about
(A) 3
(B) 5
(C) 8
(D) 10
Answer: A

49. A stone is rejected if the water absorption is more than
(A) 30%
(B) 25%
(C) 20%
(D) 15%
Answer: D

50. Attrition test on stone is done to find out
(A) Compressive strength
(B) Hardness
(C) Rate of wear
(D) Toughness
Answer: C