MYE 2023 G7 Physical Science Practice

Which of the following physical properties best explains why a baloon is filled with helium gas instead of air?

• Low density
• High compressibility
• Take the shape of the balloon
• Has attractive color

Which of the following substances has the highest melting point?

• Margarine
• Mercury
• Candle
• Table salt

Which reason best explains why aluminium is used for making drink cans instead of zinc?

• It is a good conductor of electricity
• it is malleable
• It is light
• It is a good thermal conductor

The handle of a cooking pan is made of plastics. Which reason best explains why it is made of plastics?

• it has a high melting point
• it is a poor conductor of electricity
• it is a poor conductor of heat
• it is light

Mercury and iron are both classified as metals. At room temperature, mercury is a liquid and iron is a solid. Which of the following statements is not correct?

• both are good electrical conductors
• both have the same melting points
• both are good thermal conductors
• both are shiny

Why is it easy to compress air?

• the particles in air move in all directions
• the particles in air move very quickly
• there is a lot of empty space between the particles of air
• the particles of air are arranged randomly

Which of the following physical properties describe metals?

• Brittle
• Shiny
• Ductile

In cold countries, animals usually grow thicker layers of fur in winter to keep them warm. What is the best explanation of why this extra fur keeps them warm?

• fur is a good conductor of heat
• fur is a poor conductor of heat
• fur traps more air, which is a good conductor of heat
• fur traps more air, which is a poor conductor of heat

Which of the following properties is true for both solilds and liquids?

• Both have fixed shapes
• Both have fixed volumes
• Both have the same densities
• Both have the same colour

What happens to the particles in a balloon when it is compressed?

• The particles move slower.
• The particles move freely, bounce and knock against each other more often.
• The particles vibrate more vigorously about their fixed positions.
• The particles cannot move at all