Welcome to your Grade 8 General Science chapter 7
After carefully reading the following 30 questions, choose the correct answer.
1.
What is the process of light bouncing off a surface called?
2.
Which term describes the bending of light as it passes from one medium to another?
3.
What phenomenon occurs when white light splits into different colors after passing through a prism?
4.
How is sound defined in terms of physical phenomena?
5.
Through which medium does sound travel the fastest?
6.
What is the term for a closed loop or pathway that allows electric charges to flow?
7.
Which component is used to either close or break an electric circuit?
8.
What mechanism of heat transfer involves the movement of heated liquid upwards and colder liquid downwards?
9.
Where is the attraction power of a magnet at its maximum?
10.
What type of material allows light to pass through so that objects behind it can be clearly seen?
11.
Which part of the eye is the image formed on in a normal eye?
12.
Objects that emit their own light are referred to as what?
13.
What happens to the density of water when it is heated from the bottom?
14.
Which method of heat transfer can occur through empty space (vacuum)?
15.
When a switch is in the "off" position, what is the state of the circuit?
16.
What is the purpose of an electric cell in a simple circuit?
17.
Materials that do not allow any light to pass through them are classified as?
18.
Which form of heat transfer occurs through a metal stick when one end is placed in hot water?
19.
What is the term for a reflected sound?
20.
What are materials called that allow only some light to pass through?
21.
In an electric circuit, what material is typically used to connect the components?
22.
Which of the following is a primary source of light for the Earth?
23.
What describes the path that electricity follows from a battery to a bulb and back?
24.
Which of the following is a characteristic of sound propagation?
25.
What happens to light when it hits a highly polished surface like a mirror?
26.
Which process is used to explain how heat from the Sun reaches the Earth?
27.
What are the regions of maximum attraction in a magnet called?
28.
In which medium is the speed of sound the slowest?
29.
What device is typically used in a simple circuit to consume electrical energy and produce light?
30.
What must happen for an electric current to flow through a circuit?
