Question

Match List-I (Equipment) with List - II (Use) and select the correct answer using the codes given below the lists:
List - I
A. Vibratory rollers
B. Sheep foot rollers
C. Frog hammers
D. Vibrofloats

List - II
1. To compact soils in confined areas and at corners
2. To compact road and railway embank-ments of sandy soils
3. To densify sandy soils over a large area and to a large depth
4. To compact clayey soil fills.

• A. Codes:
  A B C D
  4 2 1 3
• B. Codes:
  A B C D
  4 2 3 1
• C. Codes:
  A B C D
  2 4 1 3
• D. Codes:
  A B C D
  2 4 3 1

Answer 1

The correct option is C Codes:
A B C D

2 4 1 3
Frog hammers are used to compact soils in confined areas and at corners e.g., back of retaining wall, etc.
Soil densification techniques are used for reducing liquefaction hazards is to avoid large increases in pore water pressure during earthquake shaking. Vibrofloatation involves the use of a vibrating probe that can penetrate granular soil to depths of over 100 feet. The vibrations of the probe cause the grain structure to collapse thereby density the soil surrounding the proble. To treat area of potentially liquefiable soil, the vibroflot is raised and lowered in a grid pattern.