Degradation kk

Fill in the blank: _______ is an exposure condition that involves temperature changes.

• Acid rain

• Freeze-thaw

• Alkalis

• Ultraviolet (UV) radiation

What is dry rot caused by?

• Excess moisture

• Specific fungi

• Lack of sunlight

• High temperatures

Lichens and mosses grow on surfaces in _______ environments.

• Dry

• Hot

• Damp

• Windy

What is the combined action of sunlight, rain, wind, and frost known as?

• Thermal ageing

• Weathering

• Freeze-thaw

• Micro-cracking

Fill in the blank: Repeated cycles of heating and cooling cause ______ in the surface.

• Micro-cracking

• Melting

• Evaporation

• Solidification

What accelerates many of the chemical processes involved in material degradation?

• Low temperatures

• High temperatures

• Constant temperatures

• Variable temperatures

Which of the following is a consequence of freeze-thaw cycles?

• A) Surface crumbles away

• B) Surface becomes smoother

• C) Surface remains unchanged

• D) Surface becomes waterproof

Humidity increases the _______ content of timber.

• moisture

• temperature

• pressure

• none of the above

What is the effect of high humidity on building materials?

• Prevents evaporation

• Causes creep

• Reduces temperature

• None of the above

Which of the following is NOT a cause of condensation?

• Warm humid air

• Contact with surfaces

• High temperatures

• Lower temperatures