10) MULTI-CHOICE (MULTIPLE CORRECT ANSWERS) (4 marks). Mark each of the CORRECT

Question

10) MULTI-CHOICE (MULTIPLE CORRECT ANSWERS) (4 marks). Mark each of the CORRECT options below.

The terminal velocity of a falling volcanic particle depends on:

a) Its diameter.

b) Its shape.

c) The wind speed.

d) The height at which it is released by the plume.

e) Its density.

9) MULTI-CHOICE (MULTIPLE CORRECT ANSWERS) (4 marks). Mark each of the CORRECT options below.

A STRONG volcanic plume:

A. a) Has a bent-over shape.

B. b) Is not strongly affected by the wind.

C. c) Does not extend upwind of the vent.

D. d) Has a high rise velocity.

12) TRUE OR FALSE (1 mark)

Particle aggregation leads to early sedimentation of ash from a plume at closer distances to the source vent.

11) TRUE OR FALSE (1 mark)

Particle aggregation is promoted by the presence of water in a volcanic plume.

a) Its diameter.

b) Its shape.

c) The wind speed.

d) The height at which it is released by the plume.

e) Its density.

Explanation / Answer

Question 10)

The terminal velocity of a falling velocity particle depends on

a) its diameter

b)it's shape

e) its diameter

Reason : since the formula for the terminal velocity is given by

velocity formula, v = the square root of ((2*m*g)/(*A*C))

m- mass of object ,g - acceleration due to gravity,A - projected area , C - drag coefficient depends on shape - density

The terminal settling velocity is the result of the
balance among the drag force and all externally applied
forces (gravity ). It strongly depends on size,
shape and density of the particles and the properties of the
fluid medium.

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