Welcome to your General Science Grade 8 Unit 7
Choose the correct answer from the given alternatives
1.
What is the phenomenon that causes a change in the direction of light as it passes from one medium to another?
2.
What is the bending of light around an obstacle or the spreading of light waves when passing through a small opening called?
3.
Which color of light is refracted the most when passing through a prism?
4.
What is the splitting of white light into its component colors when passed through a prism called?
5.
What is the phenomenon where light waves cancel each other out, resulting in darkness?
6.
What is the term for the perceived change in frequency or pitch of a sound due to the motion of the source or observer?
7.
In which medium does sound travel faster: air or water?
8.
What is the phenomenon where sound waves are reflected by a surface, producing echoes?
9.
Which part of the ear amplifies sound vibrations and transmits them to the inner ear?
10.
What is the term for the persistence of sound after the source has stopped, usually due to multiple reflections?
11.
What is the flow of electric charge through a conductor called?
12.
what is the unit of electrical resistance?
13.
Which device is used to break an electric circuit and interrupt the flow of current?
14.
What is the phenomenon where an electric current produces a magnetic field around a conductor?
15.
What is the device that transforms electrical energy into mechanical energy when an electric current passes through it?
16.
What is the transfer of heat through direct contact between particles of matter?
17.
What is the process by which a gas turns into a liquid when it loses heat?
18.
In which scale is temperature measured in degrees Celsius and Fahrenheit equal?
19.
What law states that the pressure of a gas is inversely proportional to its volume at constant temperature?
20.
What is the term for the maximum amount of heat that can be absorbed by a substance without a change in temperature?
21.
What is the force that opposes the relative motion or tendency of such motion of two surfaces in contact?
22.
What is the term for the force that acts on an object due to gravity?
23.
What is the law that states that an object at rest will remain at rest, and an object in motion will remain in motion?
24.
What is the SI unit of force?
25.
What is the term for the product of an object's mass and velocity?
26.
What is the fundamental property of a magnet that allows it to attract certain materials?
27.
In a magnet, what is the region where the magnetic force is strongest?
28.
What happens when you break a bar magnet into two pieces?
29.
Which material can be easily magnetized?
30.
What is the term for a temporary magnet that loses its magnetism after the removal of the magnetic field?
31.
What is the SI unit of magnetic flux?
32.
What is the phenomenon where a changing magnetic field induces an electromotive force in a conductor?
33.
What is the device used to measure the strength of a magnetic field?
34.
What is the term for the alignment of magnetic domains in a material to produce a strong magnetic field?
35.
In a magnetic compass, which direction does the needle point as the north-seeking pole?
36.
What is a simple circuit?
37.
Which component in a circuit provides resistance to the flow of electric current?
38.
In a simple circuit, what is the function of a switch?
39.
What is the unit of electrical current in the International System of Units (SI)?
40.
Which symbol represents a resistor in a circuit diagram?
41.
What is the potential difference measured in a circuit called?
42.
If you connect two resistors in series in a circuit, what happens to the overall resistance?
43.
What type of circuit allows only one path for the flow of electric current?
44.
In a parallel circuit, what happens to the brightness of bulbs when more are added to the circuit?
45.
Which component stores electrical energy in a circuit?
