WorksheetsNatural Phenomena BSME 3-2
Total questions: 20
Worksheet time: 10mins
How does tribology contribute to understanding natural phenomena?
By studying the chemical reactions in the atmosphere
By analyzing surface interactions that shape landscapes and geological flows
By measuring the speed of tectonic plate movements
By predicting the weather patterns
What is one of the benefits of applying tribological principles to natural events?
It helps in predicting the weather
It aids in developing predictive models and mitigation strategies for natural disasters
It improves the efficiency of solar panels
It enhances the growth of plants in arid regions
What is the typical diameter range of saltation particles?
0.001 - 0.01 mm
0.1 - 1 mm
1 - 10 mm
10 - 100 mm
Which of the following is NOT a consequence of wind erosion?
Reduction in agricultural productivity
Contribution to atmospheric dust pollution
Enhancement of soil fertility
Threat to food security
What mechanism weakens the interparticle bonds in soil, making it easier for particles to detach and erode?
Adhesion
Saturation Softening
Stripping by Laminar Flow Shear
Particle Migration
What is the term used to describe the phenomenon where rock avalanches exhibit much longer runouts than expected from a frictional slide down an incline?
Fluidization
Hypermobility
Thermal Pressurization
Wear and Fragmentation
What mechanism involves the trapping of air or vaporization of pore fluids, generating excess pore pressure and reducing effective normal stress?
Wear and Fragmentation
Fluidization and Pore Pressure
Thermal Pressurization
Frictional Strength
What are the two processes involved in the weakening mechanism of apparent friction induced by thermal pressurization?
Reduction of effective normal stress and increase in shear stress
Reduction of effective normal stress and weakening of residual friction
Increase in pore pressure and reduction of shear stress
Increase in temperature and reduction of normal stress
How does increased temperature affect the adhesion force between fine particles in soil?
It strengthens the adhesion force.
It weakens the adhesion force and promotes particle activity.
It has no effect on adhesion force.
It freezes the particles, reducing activity.
What is the role of nanoparticles in fault lubrication during seismic slips?
Nanoparticles increase the friction between particles.
Nanoparticles facilitate fault lubrication through rolling.
Nanoparticles prevent dynamic weakening of faults.
Nanoparticles reduce the shearing velocity.
What is the role of basal resistance in glacier dynamics?
It prevents glacier tongues from detaching from their beds.
It accelerates the movement of polar ice streams.
It regulates the seasonal speed of outlet glaciers.
It causes catastrophic break-off events.
What is the significance of rate-weakening friction in ice stream dynamics?
It stabilizes the glacier bed and prevents sliding.
It explains sliding instabilities and episodic ice stream acceleration.
It enhances viscous creep and melt-refreeze cycles.
It reduces the frictional resistance of Antarctic ice streams.
What is the primary effect of hydrodynamic lubrication in glacial sliding?
Increased friction due to direct contact
Formation of thin films of meltwater
Lowering the effective friction coefficient
Generation of rock particles as abrasives
What is the relationship between basal shear stress, sliding velocity, and water pressure in glacier surges?
They are unrelated factors
They are influenced by feedback mechanisms
They prevent cyclic flow velocities
They reduce strain heating
What is the tribological condition called where static friction alternates with sudden slips in glaciers?
Hydrodynamic lubrication
Stick-slip behavior
Channel refreezing
Velocity-weakening friction
Which tribological principle is responsible for reducing adhesive forces between opposing cartilage surfaces?
Friction
Wear
Lubrication
Adhesion
What is the significance of cartilage in tribological studies?
It serves as a model system for maintaining low friction under high mechanical loads
It promotes tissue fusion and sticking
It increases friction for stability
It enhances abrasive wear in biological systems
Which tribological principle is responsible for the microscopic sticking between metal surfaces?
Friction
Wear
Lubrication
Adhesion
What is fault gouge, and how does it affect fault behavior?
A lubricant that strengthens the fault.
Fine rock powder that can strengthen or weaken the fault.
A mineral that reduces friction during slip.
A molten layer that lowers fault strength.
What is the term for the fine powder or clay formed by repeated grinding of fault surfaces?
Fault gouge
Fault slip
Synovial fluid
Tectonic erosion
