
World Scholars Cup 2019 - Science (Enabling Technology)
Science
4th - 9th Grade
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15 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why can a standard battery not be recharged?
Corrosion of cathode by energy-producing chemical reaction
Corrosion of anode by energy-producing chemical reaction
Low rated capacity
Dischargement
2.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
What is the correct connection between current type and direction?
Alternating Current ("AC") - the current only flows in one direction
Direct Current (“DC”) - changes direction periodically
Alternating Current ("AC") - changes direction periodically
Direct Current (“DC”) - the current only flows in one direction
3.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
Why do diffrent regions use diffrent plugs?
Has their own advantages
Diffrent plugs are suitable for their country
Different countries prioritize differently
Due to Enemy above conspiracy
4.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
How does ionizing filter work?
Uses a bed of activated carbon to remove contaminants and impurities, using a method called chemical adsorption
Uses high voltage to electrically charge air molecules which results in a net positive charge which then gets trapped in the filter.
Traps pollutant molecules in the fluid to be treated and removed inside the pore structure of the carbon substrate
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What was most known as "Force behind the improvement of women's position in society" ?
Washing machines
Dishwashers
Vacuum cleaners
Home robots
Toaster
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which current does Magnetic stove (Induction cooking) use?
High-frequency Direct Current
Low-frequency Direct Current
High-frequency Alternating Current
Low-frequency Alternating Current
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does the "rapidly alternating magnetic field" penetrating the object with on the Magnetic stove?
Joule heat
Eddy currents
Hydrogen bonds
Hot air
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