Post Scientific Thinking 4b*

1. Sana'a buys a ring made of gold and silver. After few weeks, the silver part of the ring looks black and dull. The gold part stays shiny, the problem is:

What makes the gold part shiny?

What changes happened to the gold part?

What changes happened to the silver part?

2. Leen puts some ice cubes in a glass of water. She leaves her glass on the table. When she returns, the ice is gone. The problem is:

What happened to the ice cubes?

What happened to the water?

Who removed the ice from the cup?

3. Omar used a graduated cylinder to measure 40 ml of water, then after freezing the water over night the volume of the water raised to 44 ml. the problem is:

How does freezing affect the volume of water?

How does freezing affect the mass of water?

How does freezing affect the color of water?

4. Kareem uses a balance to measure the mass of an apple. He then cut up the apple into four pieces of varying sizes. He wanted to know if the size of the apple pieces affects its total mass or not? His hypothesis is:

If the size of the apple pieces changes, then its total mass will change.

If the size of the apple pieces changes, then its total mass will not change.

If the size of the apple pieces doesn't change, then its total mass will change.

5. In the science lab Farah was measuring the melting point and the boiling point of water, she organized her results in the following line graph that shows the relation between the temperature and the time. She needs to set her experiment and test when does ice change to liquid water, her hypothesis will be:

If the temperature increases, then ice will change to liquid water.

If the temperature decreases, then ice will change to liquid water.

If the temperature increases, then liquid water will change to ice.

6. In parallel circuit, electricity has more than one path to flow. Electrical current can flow in different paths as they flow from the negative side of the battery to the positive side. Hamzeh wanted to know if a broken or a missing light bulb affects the other light bulb or not. His hypothesis will be:

If a light bulb is missing or broken, then the other light bulb will light.

If a light bulb is missing or broken, then the other light bulb will not light.

If a light bulb is missing or broken, then the other light bulb will get dimmer.

7. A scientist wants to build a series circuit using a small battery and a small light bulb, he runs out of wire. What everyday object could he use to connect the battery to the light bulb?

Use a metallic spoon

Use a plastic ruler

Use a rubber eraser

8. If you find a metal bar, how can you determine if it is a magnet or not?

Pour water over it and see the reaction

Put something made of iron near it and see the reaction

Heat the bar and see the reaction

9. Zaid wanted to differentiate between the chemical and the physical change, Study the experiment below. How can you tell Zaid if a change has occurred?

Mix vinegar and baking soda

Mix vinegar and water.

Mix water and baking soda.

10. Layal washes dishes and put the clean wet dishes on a drying rack. Water in these dishes dries up because:

The water melts.

The water condenses.

The water evaporates.

11. An astronaut weighs on Earth 180 pound, while on the moon he weighs about 30 pound. This is due to:

The gravity on the moon is less than the gravity on Earth.

The gravity on the moon is more than the gravity on Earth.

The mass of the astronaut on the moon is less than his mass on Earth.

12. Mohammad uses the graph below to find the relation between the power of the electromagnet and the number of coils. He finds out that:

The strength of the electromagnet increases when the number of coils decreases.

The strength of the electromagnet increases when the number of coils increases.

The strength of the electromagnet is not affected by the number of coils.

13. An electrician is a person who works on and repairs electrical equipment. He needs to protect himself from an electric shock. So he uses: rubber gloves, special shoes with thick rubber soles, and plastic tools. Which all are:

Insulators to keep him safe.

Conductors to connect the electricity.

Tools to keep him clean.

14. Electricity and magnetism are closely related. They have a great role in our everyday live than we might realize. Wind turbines generate electricity. Water turbines generate electricity too. All generators transform energy from:

Electrical into energy of motion.

Electrical into light energy.

Kinetic into electrical energy.

15. Raed connected this circuit. He tried to add or remove parts to make a brighter light. When he added more batteries, the circuit made a brighter light, but when he added less batteries he made a dim light, finally he generalized that

Adding more light bulbs makes brighter light.

Adding more batteries makes brighter light.

Removing batteries makes brighter light.