a) what must be
true about two objects for conduction to take place?
they must have a thermalconct, in terms of conduction
of eat.
b) which
factors affect heat transfer between a warm and a cool substance?
the two substance must a thermal contact for te transfer of
heat to occur, this is according to the zero law of thermodynamics, which that
, if a body A and another body B are at thermal equilibrium with another body
C, then both body A and B are also at thermal equilibrium;
thermal equilibrium
simply means same temperature,
c) how does
radiation help treat cancer?
radiation can treat cancer , when the cancerous cells are
exposed to to this radiations, this will destroy the DNA of tis cells and are
removed from the body by natural process
d) how does an
increase in thermal energy affect molecules?
when the thermal
energy of a body changes, the kinetic energy of the individual particles of the
body increases, this makes the particles to vibrate at greater speed and more
violently, eventually the crystal
structure of substance is weaken and the it collapse, and individual particle
are now free to translate, ( translation motion) if the substance is in solid
it changes to liquid and if in liquid the particles escapes as gases.
e) hot coffee
in a mug cools over time and the mug warms up. which describes the energy in
this system?
a) convention
b) conduction
c) radiation
d) none of the
above
f) which
substance has the most thermal energy and will have the most heat flow from it?
a) 1kg of
groundnut oil
b) 20g of iron
c) 100og of
sugar
d) 1kg of
uranium
g) heat
transfer between two substances is affected by specific heat and the
a) temperature
b) mass of the
substance
c) volume of
the substance
d) none of the
above
h) a burner on
a stove produces
a) light energy
b) eat energy
c) luminous
energy
d) none of the
above
i) what
affects how quickly something cools
a) ambient
temperature
b) material
property
c) thermal
contact
d) none of te
above
j) how can we
maximise the rate of energy transfer to keep things cool
a) we use
isothermal process
b) adiabatic
process
c) isobaric
process
d) none of the
above
k) why does a
hot object cool
it losses its energy to the environment
l) how does
surface area affect heat transfer
it is is proportional to the rate of heat transfer, the
larger te surface the higher the rate of heat transfer.
m) what affects
how quickly something cools
environmental temperaturre
n) how does
surface area affect heat loss
it is is proportional to the rate of heat transfer, the
larger te surface the higher the rate of heat transfer.
o) the amount
of heat required to raise the temperature of 1 gram of a substance by 1°c is
called
the specific heat capacity
p) which
factors affect heat transfer between a warm and a cool substance?
the two substance must a thermal contact for te transfer of
heat to occur, this is according to the zero law of thermodynamics, which that
, if a body A and another body B are at thermal equilibrium with another body
C, then both body A and B are also at thermal equilibrium; thermal equilibrium simply means same
temperature,
q) what must be
true about two objects if heat is flowing between them?
the two substance
must a thermal contact for te transfer of heat to occur, this is according to
the zero law of thermodynamics, which that , if a body A and another body B are
at thermal equilibrium with another body C, then both body A and B are also at
thermal equilibrium;
thermal equilibrium
simply means same temperature,
r) which
substance is most likely to heat up the fastest?
a) water
b) oil
c) iron
d) plastics
s) a(n) is a
material that takes in a wave when the wave hits it.
a) polarizers
b) filers
c) reflectors
d) radiators
e) none of the
above
t) is a
material that causes a wave to bounce off of it.
a) filters
b) reflectors
c) radiators
d) none of the
above
u) a diagram
that shows thermal energy being released by objects is called a
a) radiation
curve
b) heat curve
c) thermal
curve
d) heat graph
v) which
material most likely gets the warmest when placed in the sun?
a) iron
b) copper
c) silver
d) lead
w) which best
illustrates the way in which radiation transfers thermal energy?
answer this question
x) examples of
heat transfer by radiation
solar energy
y) examples of
convection heat transfer
boiling water , steam engines
z) examples of
conduction convection and radiation in our everyday life
heattransfer in pressing iron for smoothing our cloth is a
conduction, boiling egg is convention and electric bulb for lighting our ome is
radiations
aa) 5 examples of
heat transfer by radiation
I. electric
bulb in lighting our home,
II. energy from
solar radiations
III. when on hold
hand above fire
IV. electric room
warmer
V.
bb) which best
explains how thermal energy is transferred when someone holds a hand above a
fire?
a) radiation
b) conduction
c) convection
d) none of the
above
cc) which process
represents the phase that occurs after a solid melts?
A. liquid
B. plasma
C. solid
D. gaseous
dd) when does
carbon dioxide absorb the most heat energy?
A. in nuclear
reactor
B. during
respiration in mammals
C. in carbonated
drinks
D. none of the
above
ee) which energy
change occurs during boiling?
energy absorption
ff) at what
temperature does the solid start melting?
a) boiling
point
b) freezing
point
c) melting
point
d) steam point
gg) which best
explains the relationship between evaporation and temperature?
evaporation and temperature are directly proportionally the
higher the temperature the higher the rate of evaporation
hh) which example
involves a phase change in which heat energy is released by the substance?
a) conduction
b) solidification
c) liquefaction
d) freezing
e) recombination
ii) which best
describes the energy change that takes place during deposition?
a) nuclear
synthesis
b) thermo
synthesis
c) decomposition
d) none of the
above
jj) which
arrows represent the phase transitions in which heat energy is gained?
a) solid
→liquid →gas
b) liquid → gas
→solid
c) solid →gas
d) gas →solid
e) all of the
above
kk) electric
field lines are drawn away from the positive test charge
true
ll) an electric
field has strength but not direction
false
mm) thomas edison
argued that our electrical system should use direct current
true or false
nn) charging by
induction is called
electrostatic influence
oo) charging by
conduction is called
charging by contact.
pp) the sky
appears blue due to the light reflected from the oceans.
false, it is due to scattering the blue spectrum of white
light by air molecules
qq) a rainbow
always appears
answer this question
rr) the
electrical force is much weaker than the force of gravity.
alse, the electric force is about 1039 times greater than gravity.
ss) electrons
move from the power plant to homes in an alternating current.
true
tt) the unit of
electric charge is called a(an)
a) columb
b) newton
c) joules
d) none of the
above
uu) the unit of
electric potential difference between two points is
a) volt
b) ampere
c) ohms
d) reistivity
vv) the colors of
the visible spectrum can be measured in units of
a) meter
b) cm
c) nanometer
d) picometer
ww) farsightedness,
or hyperopia, can be corrected with what type lens?
a) convex
b) biconvex
c) plano
concave
d) convex
e) none of the
above
xx) what are the
units of h in the equation e = hf?
a) joules/hertz
b) J/S-2
c) joules-seconds
d) none of the
above
yy) we explain
light today as
a) waves
b) particles
c) energy
d) all of the
above
zz) polarized
light vibrates
in one direction
aaa) of the
following, the electromagnetic wave with the shortest wavelength is
gamma, xray, visible light, microwave
the shortest
waves is gamma
bbb) which
characteristic of waves of visible light is most similar to waves of
microwaves?
a) interference
b) reflection
c) dispersion
d) none of the
above
ccc) the
separation of white light into its component colors is
is called dispersion
ddd) an overhead
fluorescent light bulb would be considered which kind of light source?
a) luminous
b) non-luminous
c) incandescent
d) none of the
above
the shortest of all the radio( em) waves is the
gamma is the shortest
eee) the sky
appears to be blue when the sun is high in the sky because
the blue spectrum has
the longest wavelength
fff) an optically
formed duplicate of an object that has light actually coming from the duplicate
is
attempt this question
ggg) which color of
light carries less energy
violet carries least energy, because it has the longest
wavelength.
1. the
separation of white light into its component colors is
is called dispersion
2. the sky
appears to be blue because
scattering of the blue spectrum of light by atmospheric
particles and airmolecules
3. a rough
surface produces irregular light reflection in which all reflected rays are
parallel.
true, laws of relection is obeyed at individual ray level
4. which
statement describes how light behaves when it strikes a translucent material
most of it is scattered in all direction , only small part
of it is absorbed, transmitted or reflected
5. which
statement explains why the sky appears blue on a sunny day
scattering of the blue spectrum of light by atmospheric
particles and airmolecules
6. a mirage is
created when light is refracted
by a cooler thinner
air molecules
7. parabolic
mirrors eliminate the spherical aberration that is found in spherical mirrors.
true or false
8. a straw
placed in a clear glass of water appears to break at the water’s surface
because
refraction of light
9. which
sequence shows the light transmitting capabilities of materials from least to
most
opaque → translucent → transparent, all light impinging on opaque are relected ,
on transluent are scattered and transparent
transmitted.
10. how does the
scattering of tiny particles in the air affect the colors of the sky
the color of the sky depend on the spectrum of the light
scattered , the distance of the sun from the atmospehere.
11. what an
object is made of and the color of light that strikes it determine the
color of the object
12. why can blue
light and yellow light combine to produce white light?
because they are complimentary colors, yellow = green + red,
therefore yellow + blue is same as
blue + red + green =
white light
13. in order of
decreasing light-transmitting capabilities of materials, which is the correct
sequence?
opaque → translucent → transparent, all light impinging on opaque are relected ,
on transluent are scattered and transparent
transmitted.
14. the visible
light spectrum ranges between
400-700 nanometers
15. a sunset
appears red because
the longest spectrum red is reflected.
16. an
incandescent light bulb produces light when electrons flow through the
neon gas
17. which kind of
light is used to carry information through optical fibers
18. the primary
colors of light are
red. blue and green
19. michelson
calculated the speed of light using
A. mirror
B. spring
C. planet
D. none of the
above
20. infrared rays
have a shorter wavelength than
A. microwaves
B. radio waves
C. tv waves
D. all of the
above
21. photons
travel outward from a light bulb in
neon bulb
22. which of the
following is not true regarding neon lights
23. a fluorescent
light tube usually contains
neon gas
and attempt the following questions
24. light acts
like
waves and particles at same time, this is called
particle-wave duality of light.
25. cellular
telephones utilize
26. which of the
following is not true regarding neon lights?
27. light moving
through a small pinhole does not make a shadow with a distinct, sharp edge
because of
28. radiation
transfers thermal energy through .
29. factors
affecting rate of cooling of water
30. how can the
structure of the vacuum flask minimise energy transfer by conduction
31. which
statement accurately describes the flow of heat in each example?
32. which best
explains how radiation is helpful in the plastics industry?
33. which energy
change occurs during boiling?
34. how does a
foam-filled winter coat help keep a person warm?
35. which
explains why conduction is unlikely when ice is placed on a freezer shelf?
36. which best
describes the energy change that takes place during deposition?
37. which best
illustrates the way in which radiation transfers thermal energy?
38. which is
required for convection to occur?
39. conduction
can occur within a single substance, but parts of the substance must have which
property?
40. convection
only occurs in .
41. design an
experiment to measure the specific heat capacity of oil
42. what type of
surface is better for a flat roof
43.
44. what else
does the rate at which energy is transferred depend on
45.
46.
47. which best
illustrates the way in which radiation transfers thermal energy?
48. radiation
transfers thermal energy through .
49.
50. the
photoelectric effect could not be adequately explained with a wave model of
light because
51. photons
travel outward from a light bulb in
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