unit 1
Ecosystem
Ecosystem
unit 2
Chemistry
Chemistry
unit 3
Astronomy
Astronomy
unit 4
Electricity
Electricity
100
which of the following is not an abiotic factor.(K)
a) oxygen
b) water
c) bacteria
d) nutrients
c) bacteria
100
which of the following is not a physical property.(K)
a) color
b) viscosity
c) odor
d) reactivity with water
d) reactivity with water
100
what percentage of dark matter and dark energy make up the universe?(K)
a) 24% and 75%
b) 23% and 73%
c) 90% and 55%
d) 55% and 90%
b) 23% and 73%
100
what is an insulator? give 3 examples.(K)
An insulator is a material that does not conduct electrical current. Styrofoam, paper, rubber..
200
What are some things a person can do to reduce him/her ecological footprint?(I)
Switch to renewable energy, reduce your water use, reduce your waste, drive less, recycle...
200
What is the chemical formula for hydrogen peroxide ? (I)
H2O2
200
Which of the following groupings of stars is an asterism? (I)
Big Dipper
200
when bringing a charged plastic comb near a leaf electroscope would the electroscope be negatively or positively charged?(I)
it will be negatively charged, because the comb is negatively charged and when we bring it close its electric filed repels the electrons in the electroscope.
300
Explain why a beaver is the best known example of an ecosystem engineer?(C)
because these animals physically change habitats by cutting down trees, building dams, digging canals and building lodges. In doing so, beavers change the distribution and abundance of many other animals and plants, mostly by indirect interactions.
300
An atom has 36 protons, 48 neutrons, and 36 electrons. What is the element? (C)
The element is Krypton.
300
what apparent magnitude does the brightest star have?(C)
the star Sirius, the brightest star of the nighttime sky, has an apparent magnitude of -1.44.
300
Name 4 factors that affect the resistance of wires.(C)
- the type of material
-its length. The shorter the less resistance
-its diameter. The thicker the less resistance
-its temperature. The higher the temperature the higher the resistance.
400
the government of Louise's country asks the people if they should or should not sign the Krypto protocol.Explain what they should do.(A)
The protocol reduces greenhouse gas emissions. That country can reduce gas or get credit for removing carbon dioxide from the atmosphere by planting trees in non-forested areas.This will help the country be a better place, so they should definitely sign it.
400
Explain why pure water is not a conductor but other liquids such as tap water or a mix of salt water are good conductors?(A)
Pure water is a poor conductor since its pure. but tap water has quite a few ionic compounds dissolved in it and therefore is a better conductor.
400
Suppose you were lost in the forest with no compasses or devices to find your way. What should you do?(A)
first try and locate the north star. if you cant just find it by looking up, try finding the big dipper constellation. one you find that look at its tail. the tail points right towards the Polaris. once you spot it, you will know where your North, South, West and East is. using that try and find your way.
400
a television has a potential difference of 120V. if the television uses a current of 1.45 A, what is its resistance?(A)
R = V/I
R= 120/1.45
= 82.75 OHMS