Day 29-Oct 17-Worksheet-Btech-Particle size analysis

According to Stokes’ law, the terminal velocity of a soil particle during sedimentation is proportional to —

• Square of particle diameter

• Cube of particle diameter

• Reciprocal of particle diameter

• None

In hydrometer test, effective depth (He) is constant with time.

• True

• False

Stokes’ law becomes invalid when particle size < 0.2 micron due to Brownian movement.

• True

• False

Assertion (A): Stokes’ law can be applied to all sizes of soil particles. Reason (R): Because terminal velocity is independent of particle size.

• A is true, R is true

• A is true, R is false

• A is false, R is true

• A is false, R is false

The finest sieve used in dry sieve analysis = __________ sieve.

According to Stokes’ law, at…………. the upward forces are equal to the downward force of gravity.

The dispersing agent used in sedimentation analysis is __________ gm of ___ + __________ gm of ______ per litre of water.

Match the following

• Determines consistency limits

• Pipette method

• Used for fine-grained soil <75 µm

• Hydrometer Method

• Used for precise sedimentation measureme

• Casagrande Apparatus

• Used for coarse-grained soil > 75 µm

• Sieve Analysis

In hydrometer analysis, the effective depth (He) is measured as the distance between —

A soil has more than 50 % passing 75 µm sieve. According to the Indian Standard Classification System (IS 1498), it is classified as —