11 Questions
In a solid material, heat is primarily transferred through:
Conduction
What does the slope of a velocity vs. time graph represent?
Acceleration
If the frequency of a wave increases while its speed remains constant, what happens to the wavelength?
The wavelength decreases
Which of the following is an example of a mechanical wave?
Sound waves
In which medium does sound travel the fastest?
Solid metal
Which of the following electromagnetic waves has the highest frequency?
Gamma rays
What happens when two like charges are brought together?
Repel each other
How can a material become positively charged?
Gaining electrons
If you comb your hair and the comb becomes positively charged, what happens to your hair?
It will become positively charged
Which of the following can be attracted by a positively charged object?
No other object
What happens when two uncharged objects are brought close together?
Neutralize each other
Study Notes
Heat Transfer
- Heat travels from a region of higher temperature to a region of lower temperature.
- Heat can travel through a pan by conduction.
- Heat can travel through soup by convection.
Graph Analysis
- The slope of a distance vs time graph represents speed.
- The slope of a speed vs time graph represents acceleration.
Waves
- As the frequency of a wave increases and its speed remains constant, the wavelength decreases.
- The speed of a wave can be calculated by the formula: speed = wavelength x frequency.
- The speed of a wave in a lake can be calculated if the wavelength and frequency are known.
Electromagnetic Waves
- Energy from the sun reaches the earth through electromagnetic waves.
- Electromagnetic waves include infrared, ultraviolet, and X-ray waves, but not sound waves.
- Electromagnetic waves have different frequencies, with X-ray having the highest frequency.
Sound Waves
- Sound waves are produced through compression and rarefaction of molecules.
- The speed of sound increases in a sequence of media: air, wood, water, metal, and ice.
Electromagnetic Spectrum
- The electromagnetic spectrum includes infrared, ultraviolet, X-ray, and radio waves.
- Sound waves are not part of the electromagnetic spectrum.
Electricity
- Like charges repel each other.
- A material can become positively charged by losing electrons.
- When a comb becomes positively charged, hair will be attracted to it because hair becomes negatively charged.
- Positively charged objects can attract neutral objects.
Light
- Red light and violet light travel at the same speed in a vacuum.
- Red light has a longer wavelength than violet light.
This quiz is a post-test for Grade 7 Science students covering topics like electric charges and their behavior. Answer questions related to charge interactions and their effects on each other. Test your knowledge with multiple-choice questions and see how well you understand the concepts.
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