phyc f2

The liquid in a thermometer ______________ as the temperature increases.

• expands
• disappears
• freezes
• explodes

What happens to air particles when they are heated?

• Particles move faster and expand
• Particles move faster and become closer together.
• Particles move slower and the air expands
• Particles move faster become further apart

The picture shows a bimetallic strip in a fire alarm. When there is a fire outbreak, the bimetallic strip will get hot, ....

• bend downwards, complete the circuit and the alarm rings.

• bend upwards, open the circuit and the alarm will not ring.

• becomes longer, open the circuit and the alarm will not ring.

What is Thermal Contraction

• The movement of particles.

• A decrease in a materials volume when its temperature decreases

• The movement of fluids in a cycle because of convection

• A material through which thermal energy does not flow easily.

Which sentence explains why a cold metal spoon placed in a pot of boiling water becomes hot?

• Thermal energy is transferred from the spoon to the water by conduction

• Thermal energy is transferred from the water to the spoon by conduction.

• Thermal energy in the water is transformed into kinetic energy in the spoon by convection.

• Thermal energy in the spoon is transformed into kinetic energy in the water by convection.

What is Thermal Expansion?

• when a body is at rest and does not receive force

• a process where a body expands in either area, volume or shape when heated.

• a process where a heat is transferred between two objects

• When an object looses its energy due to heat

What is increasing in solid during thermal expansion

• volume

• area

• length

• all of the above

The solid expand when...

• heated

• cooled

• at rest

• exposed to noise

Why are there small gaps between rails?

• The small gaps provide space for easy expansion of rails during hotter weather.

• The small gaps allow air to keep the noise low for hotter weather.

• The small gaps are not important

• There are small gaps due to aesthetics

Convert: 186.5 K to C

• -86.4 C
• -50 C
• -68.4 C
• 180 K