(i) shot drill
(ii) diamond drill
(iii) wagon drill
(iv) churn drill
select correct answer?

A. (i) and (ii) are correct
B. (iii) and (iv) are coiTect
C. (i) and (iv) are correct
D. (ii) and (iii) are correct

A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true and R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.

(i) is suitable for soils in which roof can stand for few minutes without support
(ii) is suitable for brick lining
(iii) is suitable for concrete lining
(iv) requires large number of trench jacks
select the answer?

A. only (i) is correct
B. (i), (ii) and (iv) are correct
C. (i), (iii) and (iv) are correct
D. (i) and (ii) are correct

i) is suitable for large sized tunnels
ii) is no,’ suitable for railway or highway tunnel’s
iii) requires heavy timbers
select the correct answer?

A. only (i) is correct
B. (i) and (iii) are correct
C. (ii) and (iii) are correct
D. (i) and (ii) are correct

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

Consider the following situations

1. Soil is soft
2. Volume of existing surface traffic on the alignment is heavy
3. Track is at a deeper level
4. Water table is high

A. 1 and 2
B. 1 and 3
C. 1 and 4
D. 2 and 3

A. removal of bottom portion
B. excavation of one drift in the centre
C. removal of top portion
D. excavation being done along the periphery