260.  Assertion A : The temperature at which water freezes in the pores of a soil depends on the pore size Reason R: The smaller the pores the higher the freezing temperature in soil Codes:
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false
D. A is false but R is true.

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261.  Consider the following statements : 1. A fully saturated soil may be compressed if some water can escape from the voids 2. In partially saturated soil, reduction in volume occurs due to compression of air voids 3. Shear stress can be resisted only by the skeleton of soil particles 4. Water filling the voids also withstand normal stress by a decrease in pressure. Of these statements:
A. 1, 2, 3 are correct.
B. 2, 3,4 are correct
C. 1, 3, 4 are correct
D. 2 and 3 are correct.

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262.  Consider the following statements regarding the Vane Shear test1. The test is used to determine the undrained strength of intact, fully saturated clays.2. The test is very suitable for soft clays3. The test is only used in clays having undrained strengths less than 500 ItN/m24. The test gives reliable results if the clay contains sand or silt laminations. Of these statements:
A. 1 and 2 are correct
B. 2 and 3 are correct
C. 3 and 4 are correct
D. 1 and 4 are correct.

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263.  Consider the following statements regarding isotropic consolidation of clays1. Consolidation in the triaxial apparatus under equal all-round pressure is known as isotropic, consolidation2. The maximum value oteffective stress in the past divided by the present value is known as the over consolidation ratio (OCR)3. A normally consolidated clay has an over consolidation ratio greater than unity.4. An over consolidated clay has an over consolidation ratio of unity.Of these statements:
A. 1, 2, 3 and 4 are correct
B. 1, 2, 3 are correct
C. 1 and 2 are correct
D. 1 alone is correct.

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264.  The characteristic relationship between e and a3 of clay is shown in the figure Consider the following statements: 1. AB is the curve for the normally consolidated condition 2. BC is the curve is effective stress if reduced after consolidation to point B. 3. CD is the curve if the effective stress is increased. 4. CD is known as recompression curve Of these statements:
A. 1 alone is correct
B. 1 and 2 are correct
C. 1, 2 and 3 are correct
D. 1, 2, 3 and 4 are correct.

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265.  Consider the following statements regarding the lateral earth pressure03 1. Strains after yielding become entirely plastic 2. Yielding and shear failure occur at different states of stress 3. On attaining plastic equilibrium in a soil mass, plastic collapse occurs 4. For drained conditions, the slip surface generally consists of a straight line or a logarithmic spiral or a combination of the two. Of these statements:
A. 1 alone is true
B. 1 and 2 are true
C. 1 and 3 are true
D. 1, 3 and 4 are true

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266.  Consider the following statements regarding the Rankine's Theory of Earth Pressure 1. Movement of a retaining wall away from the soil introduces active pressure 2. Movement of a retaining wall against the soil mass introduces passive pressure 3. Product of active pressure coefficient and passive pressure coefficient is 112.4. Active and passive pressures in retaining walls increase linearly with depth. Of these statements:
A. 1 and 2 are correct
B. 1 and 3 are correct
C. 2 and 3 are correct
D. 1, 2 and 4 are correct

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