55 to 70 30 to 40 10 to 25 d Less than 10 What is the main function of red blood cells a Fight disease in the body b Carry oxygen to all parts of the body c Help the blood to clot ID: 273524
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Slide1
1. About what percentage of the human body is water?55 to 70%30 to 40%10 to 25 %d. Less than 10%Slide2
What is the main function of red blood cells?a. Fight disease in the body
b. Carry oxygen to all parts of the body c. Help the blood to clot
b.Slide3
3. Which gasmakes up 78%of the Earth’satmosphere?a. Hydrogen
b. Carbon dioxidec. Argon
d. Watere. Oxygen
f. None of
the above
Nitrogen
0.00005% (#11)
0.04% (#
5
)
0.93
% (#3 or #4)
0-4
% (#3 or #4)
21% (#2)
78% (#1)Slide4
4. The previous slide showed the ozone layer near the top of the stratosphere. Which one of the following types of solar radiation does the ozone layer and sunscreen protect us from?X-rays b. Infraredc. Ultraviolet d. Microwaves
Low energy
High energy
c.Slide5
5. Which type of wave travels the slowest? Sound wavesUltraviolet light waves Visible light waves
Infrared light wavesAll travel at the same speed.
a. 0.34 km/sec = 761 mph
299,792 km/secThe same 186,282 miles/sec 671,000,000 miles/
hr
Sound cannot travel in a vacuum
b
ut would take about 14 years
c
ompared to 8 minutes for lightSlide6
6. Of the following, which has the smallest mass?
Proton b. Neutron c. Electron d. Helium atomElectrons are teeny, tiny (1/1835) compared to the mass of an atom, protons or neutrons.
1.672x10-24 g1.675x10-24
g
9.109x10
-28
g
6.64x10-24g
Helium atomSlide7
7. Which of the figures below according to scientific evidence best represents the positions of the continents on earth 200 million years ago?TRUE!
a.
b.
c.
d.Slide8
8. Which one of the following gases does not contribute to global warming? a. Carbon dioxide b. Water c. Methane d. Freon (e.g. CCl3F) e. Oxygen (O2) f. Nitrous oxide (NO)
e.
Normal oxygen (O
2
) does not trap energy in the atmosphere but ozone (O
3
) does but it is a gas that is needed in small amounts in the stratosphere to filter out UV. Ozone is also very toxic.
O
O
2
- the
o
xygen
we need
O3
Slide9
9. Does nanotechnology deal with things that are extremely: a. Hot b. Cold c. Large d. Small
d. SmallSlide10
10. Seasons on earth are the result of:The elliptically shaped orbit of earth
The rotation of the earthThe moon’s influenceThe tilt of the earth
None of the aboveThe tilt
, not distance as the ellipse is very close to a circle. See
Private Universe
at: http
://www.youtube.com/watch?v=p0wk4qG2mIgSlide11
11. Which is an example of radioactive decay?
a
.
.
b.
c.
Nuclear fission
Nuclear
fusion
2 types of radioactive decaySlide12
12. The earth is about how many years old?6000 years b. 4.5 million years c. 4.5 billion years d. 13.8 billion years e. None of the above
The earth has been dated using several methods. Uranium-238 has a half-life of 4.5 billion years. Experiments show half of it has decayed since the origin o f the earth meaning the earth is 4.5 billion years old.
99.3% of naturally occurring Uranium is U-238 but only U-235 undergoes fission. Separation is expensive and difficult and causes huge political issues.
Age of universe!Slide13
13. Which natural resource is extracted in a process known as “fracking”? a. Coal b. Gold c. Salt d. Natural gas e. None
c.
Natural gas –
95% methane (CH
4
)Slide14
14. According to strong evidence, what caused the extinction of the dinosaurs 65 million years ago?Comet tail b. Asteroid c. Volcanic explosionsd. humansb.Slide15
15. Which is an example of a chemical reaction? a. Water boiling b. Sugar dissolving
c. Nails rusting
c.
a
and b are physical, not chemical changes.Slide16
16. If 2 objects of the same size and shape but different mass are dropped, which statement is true?The heaviest mass will fall fasterThe lightest mass will fall fasterc. They will fall at the same rate
c. Galileo is given credit for discovering that the falling rate is not dependent on mass but the story that he did this experiment on the Leaning Tower of Pisa is subject to question.Slide17
17. In our very complex U.S. measurement system, 1 cubic ft of water occupies 7.48 gallons and weighs 62.43 lbs. In the metric system, 1000 cm
3 of water occupies _____ Liters and has a mass of close to ____g.
1000 Liters, 1000 gExactly 1 l, 1000 g0.1 L, 100 g
0.001 L, 1 g
None of the above
The metric system is much easier for many reasons:
Units are related by powers of 10 instead of factors of
3, 4, 12, 16, 5280, etc.
2. Volume and distance cubed are exactly related
, 1 mL = 1 cm
3
3. For water, 1 cm3
1 g (exact at 4oC, 0.998 g at 20oC)Internationally accepted (only 1 set of tools needed)
No ridiculous abbreviations (e.g. lbs)Slide18
Which one of the
following is not true?A solution with pH = 3 is more acidic than one
with pH = 7For pH = 7, the solution
is neutral or the
hydrogen ion = hydroxide ion
pH means the negative of the
logarithm (base 10) of the
hydrogen ion concentration
Orange juice typically has a
pH of between 8 and 9
d. Is false!Slide19
Which is the better way to determine whether a new drug
is effective in treating a disease? If a scientist has a group of 1,000 volunteers, should he/she:Give the drug to all of them and see how many get better
Give the drug to only half and give placebo to other halfSame as b but volunteers and staff do not know which group is getting drug being tested.
c
.Slide20
b
.
By Mayo Clinic StaffReye's (Ryes) syndrome is a rare but serious condition that causes swelling in the liver and brain. Reye's syndrome most often affects children and teenagers recovering from a
viral infection.
Though aspirin is approved for use in children older than age 2, children and teenagers recovering from chickenpox or flu-like symptoms should never take aspirin. Talk to your doctor if you have concerns.
20. Which one of the following statements is true?
a. Amoxicillin is effective against a virus
b. Aspirin
increases the risk of Reye’s syndrome in children
c. Measles vaccine can cause autism
Amoxycillin
Resistance to antibiotics
Is sharply increasing.
bacteria
FALSE!Slide21
21. The genetic code can be found in the sequence of the bases, thymine, adenine, cytosine, guanine in:
a. Adrenaline b. Insulin c. Hemoglobin d. DNA e. None of the above
d. DNASlide22
22. Which one of the following represents photosynthesis?
Octane + oxygen carbon dioxide + water
b.
c.
d.
C is the 1
st
step of the vision process in the eye.
D represents the light initiated synthesis of
Vit
. D, the sunshine
Vit
.
combustion
B represents photosynthesisSlide23
Charles
Darwin
23. Darwin proposed that only the fittest of animals live to pass on their traits to their offspring. This forms the basis for his theory of ____as the main force behind evolution.CreationismNatural selection
Survival of the fittest
None of the aboveSlide24
http://www.pewresearch.org/quiz/science-knowledgeSlide25
Foreign-born graduates whose highest degree is in S&E, by level and field of degree: 2010