Science Revision 4

Which of the following is not a function of green leaves?

• To absorb sunlight

• To take in / give out gases

• To carry out photosynthesis

• To produce fruits for the plant                                  

The diagram below shows four rubber hoses with water inside them. Which of the following correctly shows the correct water level?

                                                                                                                   

• 1

• 2

• 3

• 4

Johan ced 3 similar plants with different number of leaves into 3 identical containers filled  

        with the same amount of water. A layer of oil was poured into each container to prevent the

        water from evaporating into the air.

3 days later, the volume of water left in each container was recorded.

 

   Which of the following shows the volume of water left in the container, starting from the    

           least amount to the most amount?   

• X, Y, Z

• Y, X, Z

• Z, X, Y

• Z, Y, X

Ahmad poured 70 cm³ of water into each of the 4 containers below. What does this tell you                                                                       

         about the characteristic of water?

• Water has mass.

• Water has definite volume.

• Water has no definite shape.

• 1)       Water cannot be compressed.  

Which of the following is a natural source of heat?

• Volcano

• Toaster

• Hair dryer

• Rice cooker

Jordon poured 100ml of tea at 80˚C into each of the four cups below. Which cup of tea will be the coldest after 20 minutes?

• Steel cup

• Wooden cup

• Glass cup

• Plastic cup

1.   

Steel spoon

 

Study the diagram below.

 

 

 

 

A steel spoon was left in a bowl of hot soup. After sometime, the metal spoon felt hot because ______________________.

• the spoon lost heat

• the soup gain heat from the spoon

•  

   

   

  heat travelled from the spoon to the bowl

• heat travelled from the soup to the spoon

Shawn filled a glass bottle with hot water and placed a balloon over its mouth as shown below. After 10 minutes, she observed that the balloon which she had placed over the mouth of the bottle had inflated.

Which one of the following explains why the balloon inflated?

• The hot air inside the balloon expands while the hot water contracts.

• The hot air surrounding the balloon causes the balloon to inflate.

•  

   

  The hot air inside the bottle contracts causing the balloon to inflate.

• The hot air inside the bottle expands causing the balloon to inflate.

A flask with a stopper was heated over a gas burner. The stopper popped out after a while.

 

 

 

 

 

Which one of the following is a likely reason why the stopper popped out?

• The stopper expanded and popped out.

• The air inside the empty flask expanded and pushed the stopper out.

•  

   

  The air inside the empty flask contracted and pushed the stopper out.

• The mouth of the flask contracted and pushed the stopper out.

1wo rectangular cardboards, X and Y, were placed between two torches and a screen. The screen shows what was observed when the torches were switched on.

 

 

 

 

 

 

 

We can conclude that __________________

 

• X is black and Y is grey.

• X is opaque while Y is translucent.

• X reflects light but Y does not reflect light.

• X is made of wood and Y is made of clear glass.