WorksheetsStd7 Final Quiz (Heat & Energy)
Total questions: 55
Worksheet time: 48mins
Cold Pack on Person
Heat is transferred from the cold pack to the person.
Heat is transferred from the person to the cold pack
The cold pack is getting warmer. The person is getting colder.
The cold pack is getting colder. The person is getting warmer.
Which shows an example of convection?
Jose cooks an egg in a pot of boiling water.
Clara burns her hand by touching a light bulb.
Lucy wraps herself in an electric blanket to keep warm.
Ben holds the end of a metal rod in a fire to cook hot dogs.
Liquids and gases are together called ___________.
Fluids
Matter
Solvent
None of the above
What is the movement of particles, during convection, called ?
Conduction currents
Radiation currents
Insulation currents
Convection currents
Near the ceiling of a room the air is warmer. The warm air rises because of
Convection
Conduction
Radiation
A chair is placed several feet from a fire in a fireplace. The fireplace has a glass screen. The side of the chair facing the fireplace gets warm because of
Convection
Conduction
Radiation
Heat, like work, is an energy transfer measured in
watts
degrees
joules
kelvins
Where is thermal expansion and contraction more noticeable?
solids
liquids
gases
it's equally noticeable in all states of matter
In which direction will heat energy flow if two substances A and B are placed in contact. Given that substance A is at 500 K and substance B is at 230°C
A to B
B to A
No transfer will occur
Cant say
What scale of temperature has the most divisions between the ice point of water and the steam point of water?
Fahrenheit
Celsius
Kelvin
None of these
As water's temperature increases from 0°C to 4°C, it's density value _________.
Remains the same
Increases
Decreases
Becomes zero
Heat energy is ________
The sum of the potential energy of the molecules
The sum of the kinetic energy of the molecules
Both of the above
None of these
Why does running a jar under hot water make it easier to open it?
Because the metal expands into the spaces between the glass threads
Because the gaps between the threads and the lid gets larger as it expands
Because hot things are more malleable
Because the gap between threads and the lid gets smaller as it expands
What feature is installed in bridges to allow them to expand during hot summers?
(a)
What is the material used to make laboratory apparatus and kitchenware?
(a)
This alloy of iron and nickel, called (a) has a low coefficient of thermal expansion and is used in clock pendulums
Real expansion of liquids is (a) the apparent expansion
When a metal ring is heated, the hole in the centre of the ring will (a) .
What are the factors affecting cubical expansion of gases (Select all that apply!)
Material of gas
Rise in temperature
Original volume
Nature of gas
Original Area
A plant turns thermal energy from the sun into chemical energy during photosynthesis. This is an example of a(n)...
Energy transformation
Matter transformation
Energy change
Physical Change
At which point of the roller coaster is potential energy the greatest?
W
X
Y
Z
What does conservation of energy mean?
Total energy increases
Total energy decreases
Total energy stays the same
What energy transformation occurs when an alarm clock rings?
electrical to mechanical, sound
chemical to mechanical,sound
electrical to thermal, chemical
mechanical to mechanical, thermal, sound
Which of the following is an example of a change of kinetic energy into gravitational potential energy?
a person parachuting out of a plane
a car racing around an oval track
a person skiing down a hill
a person walking up a hill
The picture showing the energy conversion
Chemical → heat
is:
If we know that Position A has 19.600 Joules of Potential energy, how much kinetic energy will there be at Position B?
19,600 Joules
9,800 Joules
4,900 Joules
0 Joules
If there is no friction on this track, at which point would the coaster have the most kinetic energy?
A
B
C
D
0.5 kJ of work is done by a person who uses a force of 50N to move a box, how far does it go?
10 m
0.1 m
25,000 m
10 J
If 40N of force is applied to Rollo Koster's 10 kg cart over a distance of 50 meters, how much work is done?
8000J
8000N
4000J
2000J
State the CGS unit of work
calorie
erg
joule
kilojoule
A weightlifter holds a 100 kg barbell above her head. Is work done?
Yes because there is a force applied to the barbell and the force causes a displacement of the barbell.
Yes because there is an upward force applied to the barbell and the barbell moves vertically.
No because no displacement occurred.
No because there is no force applied.
