Thermal Contraction and Expansion

What is thermal contraction?

• The process of converting thermal energy into mechanical energy.

• The tendency of matter to change in shape, area, and volume in response to a decrease in temperature.

• The process of converting mechanical energy into thermal energy.

• The tendency of matter to change in shape, area, and volume in response to a change in pressure.

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What material expands when heated?

• Iron

• Wood

• Plastic

• Glass

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What is the effect of cooling on the size of an object?

• The size of the object remains the same.

• The size of the object becomes larger.

• The size of the object decreases.

• The size of the object increases.

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What happens to the size of a material when it undergoes thermal expansion?

• The size of the material decreases due to an increase in temperature

• The size of the material increases due to an increase in temperature

• The size of the material remains the same despite the increase in temperature

• The size of the material decreases due to a decrease in temperature

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What happens to metal when exposed to cold temperatures?

• It expands

• It contracts

• It melts

• It evaporates

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What is the effect of heat on the size of an object?

• remains constant

• shrinks

• expands

• contracts

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Why does thermal expansion occur?

• Thermal expansion occurs due to the decrease in energy of particles when heated.

• Thermal expansion occurs due to the increase in energy of particles when heated.

• Thermal expansion occurs due to the change in the state of matter when heated.

• Thermal expansion occurs due to the decrease in temperature when heated.

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What happens to particles during thermal expansion?

• Particles lose energy and move more slowly

• Particles gain energy and move faster

• Particles lose energy and move faster

• Particles gain energy and move more slowly

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What is the primary reason for installing expansion joints in bridges and railways?

• To prevent damage caused by thermal expansion.

• To increase the aesthetic appeal of bridges and railways.

• To reduce the cost of construction and maintenance.

• To improve the structural integrity of bridges and railways.

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What is the impact of thermal expansion on buildings and structures?

• Thermal expansion can lead to structural damage.

• Thermal expansion only affects large structures and not small buildings.

• Thermal expansion can weaken buildings and structures.

• Thermal expansion has no effect on buildings and structures.

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