56. The span(s) to be loaded uniformly for maximum positive (upward) reaction at support P, as shown in the figure below, is (are)
    

1. 1. PQ only

   
   
   

   2. PQ and QR

   
   
   

   3. QR and RS

   
   
   

   4. PQ and RS

   
   
   

---

1. View Hint View Answer Discuss in Forum

   PQ and RS

   Correct Option: D

   PQ and RS

---

57. A vertical PQ of length L is fixed at its top end P and has a flange to the bottom end. A weight W is dropped vertically from a height h (

1. 1. increasing the length of the rod

   
   
   

   2. decreasing the length of the rod

   
   
   

   3. decreasing the area of cross-section of the rod

   
   
   

   4. increasing the modulus of elasticity of the material

   
   
   

---

1. View Hint View Answer Discuss in Forum

   ω.h =	1		σ2	.AL
   	2		E

   Correct Option: A

   ω.h =	1		σ2	.AL
   	2		E

---

---

58. The point within the cross-sectional plane of a beam through which the resultant of the external loading on the beam has to pass through to ensure pure bending without twisting of the cross-section of the beam is called

1. 1. moment centre

   
   
   

   2. centro id

   
   
   

   3. shear centre

   
   
   

   4. elastic centre

   
   
   

---

1. View Hint View Answer Discuss in Forum

   shear centre

   Correct Option: C

   shear centre

---

59. The square root of the ratio of moment of inertia of the cross-section to its cross-sectional area is called

1. 1. second moment of area

   
   
   

   2. slenderness ratio

   
   
   

   3. section modulus

   
   
   

   4. radius of gyration

   
   
   

---

1. View Hint View Answer Discuss in Forum

   radius of gyration

   Correct Option: D

   radius of gyration

---

---

60. Consider the following statements:
    I. On a principal plane, only normal stress acts.
    II. On a principal plane, both normal and shear stresses act.
    III. On a principal plane, only shear stress acts.
    IV. Isotropic state of stress is independent of frame of reference.
    The TRUE statement(s) is/are

1. 1. I and IV

   
   
   

   2. II

   
   
   

   3. II and IV

   
   
   

   4. II and III

   
   
   

---

1. View Hint View Answer Discuss in Forum

   I and IV

   Correct Option: A

   I and IV

---