P4 EYE MCQ Quiz

A dog was walking along a street on a dark night from position A to position C. As the dog was walking, it stopped by the lighted lamp post on the street at position C.

Which one of the following graphs shows how the length of the dog’s shadow

would change as it walked from position A to position C?

• 
• 
• 
• 

Answer explanation

As the dog's position is closer to the light source, the length of the shadow becomes shorter. (Remember Shadow Arc)

Bahjah had 4 different materials A, B, C and D of similar size and shape. She placed material A at position X between a light source and light sensor connected to a datalogger which measured how much light passed through the material. 

Bahjah repeated the experiment using materials B, C and D.

She recorded her results as shown in the table shown.

Based on her results above, which material could possibly be used to make curtains to block out the greatest amount of sunlight?

 

• A

• B

• C

• D

Answer explanation

B allowed the least amount of light to pass through. Thus, it would be suitable to make the curtains so that light will be blocked.

The diagram below shows two beakers X and Y. Beaker X contains small stones and Beaker Y contains water.

The water in Beaker Y is poured into Beaker X. Which diagram below shows the correct volume of Beaker X after the water from Beaker Y has been poured into it?

 

• 
• 
• 
• 

Answer explanation

There are gaps in between the pebbles. Water would occupy these air spaces. Thus the water level would be lower than 60ml.

Jimmy has three identical containers each of capacity 100 cm³ filled with water of different volumes as shown in the diagram below.  He wants to pump 20 cm³ of air into each of the containers.  

Which of the containers is/are able to hold all the air?

• A only

• B only

• B and C only

• A, B and C

Answer explanation

Water had definite volume. Air does not have definite volume and can be compressed.

Jane placed two similar flowering plants in the garden and gave them the same amount of water daily. 

 

However, she noticed that one of the plants died after a few days because she did something different to it.

 

What could she have done to cause that plant to die?

• She painted the stem black.

• She cut all the flowers away.

• She painted all the leaves black.

• She wrapped all the flowers in a black plastic bag.

Answer explanation

The plant is not able to trap sunlight to make food if all the leaves are painted black.

The length of the human small intestine is about 7 metres long.

What are the advantages of having such a long small intestine?

A : It allows more digested food to enter the bloodstream.

B : It removes water more quickly from the undigested food.

C : It provides greater surface area for digestion to take place.

• A and B only

• A and C only

• B and C only

• A, B and C

Answer explanation

Small intestine absorbs digested food and has digestive juices for breaking down of food.

Sharifah wanted to make a temporary magnet out of a nail. Which one of the following methods allow her to make a temporary magnet?

• 
• 
• 
• 

Answer explanation

Stroke method. Stroke a magnetic object using a magnet in the same direction multiple times.

Jessie placed a glass of hot chocolate in a basin of cold water as shown below.

Jessie left her set-up in the room at 30°C for 5 minutes.

 

Which one of the following statements is true about her set-up 5 minutes later?

• The temperature of both the hot chocolate and cold water did not change.

• The temperature of the cold water increased as it only gained heat from the hot chocolate.

• The temperature of the cold water decreased because it had lost its coldness to the hot chocolate.

• The temperature of the hot chocolate decreased as it had lost heat to the cold water and surrounding air.

Answer explanation

Hot chocolate higher temperature, thus it will lose heat to the cold water. Temperature decreases.

Mrs Tan left a fully inflated balloon in her car under the hot sun and then she left. When she came back to her car later, she found that the balloon had burst.

 

What could have caused the balloon to burst?

• The balloon lost heat and contracted.

• The balloon gained heat and expanded.

• The air in the balloon lost heat and contracted.

• The air in the balloon gained heat and expanded.

Answer explanation

There is air in the balloon which expanded after gaining heat.

Melissa wanted to find out which material is a better conductor of heat to melt some wax. She needs to set up the experiment using 2 rods which are attached to identical heat sources. The table below shows the different rods she can use.

Which two rods should she use to conduct a fair test?

• A and B

• B and C

• A and D

• B and D

Answer explanation

Changed variable: Type of material.

Constant variable: Length and size of rod