6. Which of the following factors are associated with the behaviour of sand mass during earthquake to cause liquefaction? 1. Number of stress cycles 2. The frequency, and amplitude of vibration of waves generated by an earthquake 3. Characteristics of sand 4. Relative density Select the correct answer using the codes given below :
8. Consider the following statements regarding Plane Table surveying : 1. It is less accurate than chain surveying. 2. It is not necessary to do accurate centering of plane table for small scale survey. 3. Compass rule may be made use for adjusting the plane table transverse. 4. From the instrument station, resectors are drawn to plot the position of object in the field. Of these statements :
9. A horizontal rod AB carries three loads of 3.0 kg, 7.0 kg and 10.0 kg at distances of 2.0 cm, 9.0 cm and 15 cm respectively from A where it is hinged. Neglecting the weight of the rod, which is the point at which the rod will be balance?
10. Two simply supported beams B1 and B2 have spans l and 2l respectively. Beam B1 has a cross-section of 1 x 1 units and beam B2 has a cross-section of 2 x 2 units. These beams are subjected to concentrated loads W each at the centre of their spans. The ratio of the maximum flexural stress in these beams is