Grade 4

At higher temperatures

• particles in an object have less energy
• particles in an object move faster
• a gas contracts

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is happening when my ice cream changes from a solid to a liquid?

• freezing
• melting
• burning
• evaporation

Tags

NGSS.MS-PS1-4

What is happening when my water bottle in the freezer goes from a liquid state to a solid state?

• melting
• evaporating
• freezing
• cutting

Tags

NGSS.MS-PS1-4

True or False
In a chemical reaction, no new atoms are created, and no atoms are destroyed. 

• true
• false

Tags

NGSS.MS-PS1-5

A chemical change is different than a physical change because in a chemical change

• Chemicals are used
• Molecules do not physically touch
• A new substance is formed and in a physical change no new substance is formed
• The change can be seen but in a physical change it cannot

Tags

NGSS.MS-PS1-2

Which one caries the sun energy 

• Electromagnetic waves 
• Transverse waves 
• compressional waves

Tags

NGSS.HS-ESS1-1

NGSS.HS-PS4-1

NGSS.HS-PS4-3

By which process is thermal energy transferred through a vacuum?

• conduction only

• convection only

• conduction and convection only

• radiation only

Which type of surface is the best absorber of infra-red rays?

• black and rough

• black and smooth

• white and rough

• white and smooth

We feel the intense heat from the Sun when we stand in the open during noon time. How is heat transferred from the Sun to the Earth?

• By radiation only.

• By conduction and radiation only.

• By convection and radiation only.

• By conduction, convection and radiation.

The diagram shows a vacuum flask.

The main reason for the vacuum is to reduce heat transfer by

• conduction and convection.

• conduction only.

• radiation only.

• convection only.