1000+ Design of Steel Structures MCQ for JEE Main [Solved]

1. The diameter of a bolt hole is taken as the nominal diameter of the bolt plus
A. 1.0 mm
B. 1.2 mm
C. 1.4 mm
D. 1.6 mm
Answer : D

2. Long column is one
A. Which is more than 3 m long
B. Whose lateral dimension is less than 25 cm
C. Which is free at its top
D. Which has a ratio of effective length and least lateral dimension more than 15
Answer : D

3. To minimize the total cost of a roof truss, the ratio of the cost of truss to the cost of purlins shall be
A. 1
B. 2
C. 3
D. 4
Answer : B

4. The channels get twisted symmetrically with regard to its axis
A. Parallel to flanges
B. Parallel to web
C. Perpendicular to flanges
D. Perpendicular to web
Answer : B

5. Normally, the angle of roof truss with asbestos sheets should not be less than
A. 26 ½°
B. 30°
C. 35°
D. 40°
Answer : B

6. In double lacing, the thickness t of flat lacing is
A. t < 1/40 th length between inner end rivets
B. t < 1/50 th length between inner end rivets
C. t < 1/60 th length between inner end rivets
D. t < 1/70 th length between inner end rivets
Answer : C

7. A tension member, if subjected to possible reversal of stress due to wind, the slenderness ratio of the member should not exceed
A. 180
B. 200
C. 300
D. 350
Answer : D

8. The most economical section for a column, is
A. Rectangular
B. Solid round
C. Flat strip
D. Tubular section
Answer : D

9. Shear buckling of web in a plate girder is prevented by using
A. Vertical intermediate stiffener
B. Horizontal stiffener at neutral axis
C. Bearing stiffener
D. None of the above
Answer : A

10. If a pair of angles placed back to back in tension are connected by one leg of each angle, the net effective area of the section, is
A. a - [b/{1 + 0.35 (b/a)}]
B. a + [b/{1 + 0.35 (b/a)}]
C. a - [b/{1 + 0.2 (b/a)}]
D. a + [b/{1 + 0.2 (b/a)}]
Answer : D

11. The bending moment for filler joists at the middle of an intermediate span, is
A. WL²/10
B. - WL²/10
C. - WL²/12
D. WL²/12
Answer : D

12. For eccentrically loaded columns, the bending factor is
A. Cross-sectional area of column/Radius of gyration
B. Radius of gyration/Cross-sectional area of column
C. Cross-sectional area of column/Section modulus of the section
D. Section modulus of the section/Cross-sectional area of column
Answer : C

13. The ratio of the span L of the filler joists to the depth d from the underside of the joist to the top of the structural concrete, should not exceed
A. 60
B. 45
C. 35
D. 25
Answer : C

14. Maximum permissible slenderness ratio of a member normally acting as a tie in a roof truss, is
A. 180
B. 200
C. 250
D. 350
Answer : D

15. If d is the distance between the flange angles of a plate girder, vertical stiffeners are provided at a distance not greater than
A. d but not less than 0.20 d
B. 1.25 d but not less than 0.33 d
C. 1.5 d but not less than 0.33 d
D. 2.0 d but not less than 0.50 d
Answer : B

16. The overlap of batten plates with the main members in welded connections should be more than
A. 3 t
B. 4 t
C. 6 t
D. 8 t Where t = thickness of the batten plate
Answer : B

17. With a percentage increase of carbon in steel, decreases its
A. Strength
B. Hardness
C. Brittleness
D. Ductility
Answer : D

18. The best arrangement to provide unified behaviour in built up steel columns is by
A. Lacing
B. Battening
C. Tie plates
D. Perforated cover plates
Answer : A

19. The minimum thickness of plates in a steel stack should be
A. 4 mm
B. 5 mm
C. 6 mm
D. 8 mm
Answer : C

20. Rolled steel beams are designated by Indian Standard series and its
A. Weight per metre and depth of its section
B. Depth of section and weight per metre
C. Width of flange and weight per metre
D. Weight per metre and flange width
Answer : B

21. For steel members exposed to weather and not accessible for repainting, the thickness of steel should not be less than
A. 4.5 mm
B. 6 mm
C. 8 mm
D. 10 mm
Answer : C

22. Hudson's formula gives the dead weight of a truss bridge as a function of
A. Bottom chord area
B. Top chord area
C. Effective span of bridge
D. Heaviest axle load of engine
Answr : A

23. The ratio of shearing stress to shearing strain within elastic limit, is known as
A. Modulus of elasticity
B. Shear modulus of elasticity
C. Bulk modulus of elasticity
D. Tangent modulus of elasticity
Answer : B

24. Pitch of tacking rivets, when double angles connected back to back and acting as tension members should not be more than
A. 500 mm
B. 600 mm
C. 1000 mm
D. 300 mm
Answer : C

25. The side thrust T on the tie rods provided at the end beam of jack arch of rise R, is calculated from the formula
A. T = WL/4R
B. T = WR/8L
C. T = WL/8R
D. T = WL/2R
Answer : C

26. The net area of round bars to resist the tension, is the area of cross section at
A. Mid-section
B. Root of the thread
C. Difference of (a) and (b)
D. None of these
Answer : B

27. The ratio of plastic section modulus to elastic section modulus
A. Is equal to 1
B. Is always less than 1
C. Is always greater than 1
D. Can be less than 1
Answer : C

28. Pick up the correct statement from the following:
A. Dead load includes self-weight of the structure and super-imposed loads permanently attached to the structure
B. Dead loads change their positions and vary in magnitude
C. Dead loads are known in the beginning of the design
D. None of these
Answer : A

29. The minimum width B of a solid casing for a cased beam, is equal to
A. B = b + 25 mm
B. B = b + 50 mm
C. B = b + 75 mm
D. B = b + 100 mm
Answer : D

30. Net sectional area of a tension member, is equal to its gross section area
A. Plus the area of the rivet holes
B. Divided by the area of rivet holes
C. Multiplied by the area of the rivet holes
D. None of these
Answer : D

31. The range of economical spacing of trusses varies from
A. L/3 to L/5
B. L/4 to 2L/5
C. L/3 to L/2
D. 2L/5 to 3L/5, where L is span
Answer : A

32. The web crippling due to excessive bearing stress can be avoided by
A. Increasing the web thickness
B. Providing suitable stiffener
C. Increasing the length of the bearing plates
D. None of the above
Answer : C

33. In a grillage footing, the maximum shear force occurs at the
A. Edge of grillage beam
B. Centre of base plate
C. Centre of grillage beam
D. Centre of base plate
Answer : B

34. In rolled steel beams, shear force is mostly resisted by
A. Web only
B. Flanges only
C. Web and flanges together
D. None of these
Answer : A

35. The deflection of beams may be decreased by
A. Increasing the depth of beam
B. Increasing the span
C. Decreasing the depth of beam
D. Increasing the width of beam
Answer : A

36. According to IS Specifications, the effective length of a column effectively held in position at both ends and restrained in direction at one end is taken as
A. 0.67 L
B. 0.8 L
C. L
D. 1.5 L
Answer : B

37. If P is the wind pressure in kg/cm², v is the velocity in km/hour and K is a constant of proportionality, then
A. P = K/v²
B. v = K/P²
C. P = Kv²
D. P = Kv
Answer : C

38. In a fillet weld placed on the sides of the base, the metal experiences
A. Shear
B. Tension
C. Compression
D. All the above
Answer : D

39. The bracing provided in the plane of end posts is called
A. Sway bracing
B. Portal bracing
C. Top lateral bracing
D. Bottom lateral bracing
Answer : B

40. Pick up the correct statement from the following:
A. Loaded columns are supported on column bases
B. Column bases transmit the column load to the concrete foundation
C. Column load is spread over a large area on concrete
D. All the above
Answer : D

41. When plates are exposed to weather, tacking rivets are provided at a pitch in line not exceeding (where t is the thickness of the outside plate).
A. 8 t
B. 16 t
C. 24 t
D. 32 t
Answer : B

42. Shape factor is a property which depends
A. Only on the ultimate stress of the material
B. Only on the yield stress of the material
C. Only on the geometry of the section
D. Both on the yield stress and ultimate stress of material
Answer : C

43. An axial loaded column is supported on a slab base whose projection is 8 cm. If the intensity of pressure from concrete is 40 kg/cm² and allowable bending stress in slab base is 1890 kg/cm², the thickness (t) of the slab base, is
A. t = ?(21/64)
B. t = ?(64/21)
C. t = 21/64
D. t = 64/21
Answer : B

44. Gantry girders are designed to resist
A. Lateral loads
B. Longitudinal loads and vertical loads
C. Lateral, longitudinal and vertical loads
D. Lateral and longitudinal loads
Answer : C

45. Effective length of a column effectively held in position and restrained in direction at one end but neither held in position nor restrained in direction at the other end, is
A. 1.5 L
B. 0.67 L
C. 0.85 L
D. 2 L
Answer : D

46. In the virtual work method, the virtual quantity is
A. Displacement
B. Load
C. Slope
D. Moment
Answer : A

47. Pick up the correct statement from the following:
A. The minimum pitch should not be less than 2.5 times the gross diameter of the river
B. The minimum pitch should not be less than 12 times the gross diameter of the rivet
C. The maximum pitch should not exceed 10 times the thickness or 150 mm whichever is less in compression
D. All the above
Answer : A

48. The maximum slenderness ratio of a compression member carrying both dead and superimposed load is
A. 180
B. 200
C. 250
D. 350
Answer : A

49. Rivets connecting flange angles to cover plates in a plate girder are subjected to
A. Horizontal shear only
B. Vertical load only
C. Both (A) and (B)
D. None of the above
Answer : A

50. The tensile strength of mild steel for bolts and nuts should not be less than
A. 32 kg/mm²
B. 36 kg/mm²
C. 40 kg/mm²
D. 44 kg/mm²
Answer : D