According to the law of conservation of mass:

Matter cannot be created or destroyed

How can you identify an endothermic reaction?

It absorbs heat from surroundings

What causes a cup of water to remain stationary on a table?

Balanced forces of gravity and normal force

What is a thermal insulator?

A material that prevents thermal energy transfer

What would happen to human movement on a planet with stronger gravity like Saturn?

Movement would be more difficult

According to Newton's First Law of Motion, an object at rest will:

Stay at rest unless acted upon by a force

What is the main difference between permanent magnets and electromagnets?

Electromagnets can be turned on and off

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8th Final Prep 2

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Test your knowledge on fundamental concepts in physics and chemistry, from atoms and molecules to Newton's laws and chemical reactions.

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Questions 20

Answers

1
In the molecule 2H₂O, how many oxygen atoms are present?
1
2
4
3
2
According to the law of conservation of mass:
Matter can be created but not destroyed
Matter can be destroyed but not created
Matter can be both created and destroyed
Matter cannot be created or destroyed
3
How can you identify an endothermic reaction?
It does not involve temperature changes
It absorbs heat from surroundings
It releases heat to surroundings
It only occurs at room temperature
4
What causes a cup of water to remain stationary on a table?
Only the table's normal force acts on it
Only gravity acts on it
Unbalanced forces
Balanced forces of gravity and normal force
5
Why does Mercury move faster than any other planet in our solar system?
It has no atmosphere
It has less mass than other planets
It has more gravity
It's closest to the Sun
6
What is a thermal insulator?
A material that prevents thermal energy transfer
A material that conducts heat quickly
A material that produces heat
A material that transfers heat one way
7
Which heat transfer process occurs when boiling water in a pot?
Insulation
Convection
Conduction
Radiation
8
How does the number of wire coils affect an electromagnet's strength?
The number of coils has no effect
Only the voltage matters
More coils decrease strength
More coils increase strength
9
What would happen to human movement on a planet with stronger gravity like Saturn?
People would float more easily
Movement would be more difficult
Movement would be faster
Gravity wouldn't affect movement
10
How are gravity and mass related?
More mass means more gravity
Gravity is independent of mass
They have no relationship
More mass means less gravity
11
According to Newton's First Law of Motion, an object at rest will:
Eventually stop moving
Stay at rest unless acted upon by a force
Change direction randomly
Always stay in motion
12
In a balanced tug of war, if one side pulls with 100N, the other side must pull with:
150N
200N
50N
100N
13
What appears before the arrow in a chemical equation?
Yield sign only
Both products and yield sign
Reactants only
Products only
14
What is the relationship between atoms and molecules?
Atoms are made of molecules
They are the same thing
Molecules are made of atoms
Molecules are larger than atoms
15
What type of chemical reaction occurs in 2KClO₃ → 2KCl + 3O₂?
Synthesis
Decomposition
Single replacement
Double replacement
16
Can Earth's gravity change?
Yes if mass is added to Earth
Only during certain seasons
No, it's always constant
Only at the poles
17
What is the main difference between permanent magnets and electromagnets?
Electromagnets never lose their magnetism
Electromagnets can be turned on and off
Permanent magnets use electricity
Permanent magnets are stronger
18
When two people push a box in the same direction with forces of 10N and 40N, the resulting force is:
50N
10N
35N
20N
19
How does mass affect the force in Newton's Second Law of Motion?
Mass only affects stationary objects
More mass increases force
Mass has no effect on force
More mass decreases force
20
What type of energy transformation occurs in a generator?
Mechanical to electrical
Electrical to mechanical
Thermal to electrical
Chemical to electrical

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