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WorksheetsCSEC Physics - 04 Energy / Temperature
Total questions: 46
Worksheet time: 1hrs 22mins
What is the correct unit for energy?
meters (m)
Newtons (N)
kilogram meters per second (kg m/s)
Joules (J)
Complete the statement about the principal of Conservation of Energy.
Energy can be changed for one form to another but the total amount of energy
always increases
does not change
always decreases
varies according to the reaction
A battery releases 100J of energy to a lamp. The lamp releases 80J of energy as light but it also releases heat energy. How much heat energy is released?
180J
160J
20J
360J
A battery releases 200J of energy to a lamp.
the energy is converted to heat and light.
50kJ is given out as heat. How much is released as Light?
100J
150J
200J
250J
A torch battery releases 50J of energy as heat and 240J as light, What is the total energy released from the battery?
250J
280J
290J
300J
The % energy efficiency of an appliance is
useful energy outputtotal energy input × 100
total energy input useful energy output × 100
total energy input×useful energy input× 100
total energy input useful energy output × 50
In a filament bulb the electrical power input is 40W and the light (Useful) energy output is 4W. What is the % efficiency?
1%
0.1%
10%
4%
In a modern low-energy bulb,
the electrical power input is 12W and the Light (useful) power output is 4W.
What is the energy efficiency of this bulb?
3%
25.5%
30%
33.3
Look at the last two questions Suggest why modern bulbs are more efficient? (There is more than one correct answer)
They do not need as big an energy input
They are not as bright
There is less wasted energy
They release less heat.
What is the Formula to calculate energy transfer for Kinetic Energy?
Ek=1/2 mv2
1/2mv=k
Em2=1/2k
EK2 =2mv
True/False: When the gradient of a heating curve is zero then there is a change in temperature.
TRUE
FALSE
The specific heat capacity of water in Joules per kilogram per Kelvin is
2700
4184
13600
19300
Specific heat capacity is the energy required to
heat a substance by unit temperature
change unit mass of a substance to solid
change unit work to unit temperature
heat unit mass of a substance by unit temperature
True/False: Specific latent heat is associated with temperature changes
TRUE
FALSE
True/False: Specific heat capacity is an extensive property
TRUE
FALSE
The faster an object moves, the ________ kinetic energy it has.
more
less
neither
both
Gravitational potential energy depends on the ________ and ________ of the object.
Height and mass
Mass and Movement
Friction and movement
Height and Friction
What is the equation for calculating gravitational potential energy?
U = mv
U = 1/2 mv^2
U = mgh
U = Ft
What is the equation for calculating kinetic energy?
K.E. = mv
K.E. = 1/2 mv2
K.E. = mgh
K.E. = Ft
Calculate the potential energy of a car with a mass of 2,500 kg that is on a hill 100 meters above sea level. (g = 10 Nkg-1)
250,000 J
2,500,000 J
25,000,000 J
250 J
Lilly's cat ran through your yard. The cat has a mass of 5 kg. He is running at a speed of 3 m/s. What is the kinetic energy of the cat as he runs? (KE = 1/2mv2)
8.5 J
45 J
7.5 J
22.5 J
Alice kicks a soccer ball with a mass of 2.1 kg. The ball leaves the ground moving 30 meters per second. What is the kinetic energy of the soccer ball? (KE = 1/2mv2)
567 J
900 J
945 J
30 J
If the 0.3 kg marble was moving at 6 m/s at the bottom of the ramp, how much kinetic energy did the marble have? (KE = 1/2mv2)
5.4 J
1.8 J
3 J
6 J
A 5 Kg body is having a Kinetic energy of 250 J. What is the velocity (or speed) of the body?
10 m/s
15 m/s
20 m/s
40 m/s
____________is a million times smaller than the thickest human hair
Atom
Cell
Sand
Compound
Particles possess ___________energy due to constant random motion
Potential
Chemical
Kinetic
Electric
An example of plasma state
Which of the following is highly compressible
Wool
Milk
Sanitizer
Oxygen
Mercury does not wet glass because its adhesive force is greater than its cohesive force.
True
False
Unit of Latent heat is
Jkg
kg/J
J/kg
J
Examples for latent heat of fusion ( there could be more than 1 correct answers)
During a change in state of matter, the amount of heat energy absorbed causes a change in temperature
True
False
Soft drinks are cooled faster by placing them in ice rather than in water at 0oC.
True
False
A burn caused by boiling water is more serious than a burn caused by steam.
True
False
Icebergs do not melt due to
High latent heat of vaporisation of ice
Low latent heat of Fusion of ice
High latent heat of Fusion of ice
Low latent heat of vaporisation of ice
The picture is an example of
Evaporation
Deposition
Sublimation
Condensation
Jack keeps a bowl of water outside in the morning, in the afternoon he realises that the level of water in the bowl has reduced. This is due to
Boiling
Freezing
Evaporation
Sublimation
Boiling ( More than 1 answer could be correct)
is a fast process
Causes cooling
Takes place only on the surface of the liquid
Is accompanied by formation of bubbles
This process is called
Melting
Freezing
Sublimation
Deposition
If the melting point of a substance is 30oC, then it continues to remain at that same temperature until the entire process of melting is complete
False
True
Evaporation happens at a range of temperatures higher than the boiling point
False
True
Observe the change of state diagram. If the object is solid at P, Then its boiling point is
T20C
T10C
00C
None of the them
Observe the diagram again, Freezing is taking place at
Q to R
S to T
T to S
R to Q
What is 0oC in Kelvin?
110 K
100 K
273 K
210 K
Q. How much heat is absorbed when 355g of water goes from 25-45 degrees Celsius? The specific heat of water is 4180 J/kg.K
21945 J
21945 g
29678 J
29678 g
A 300g piece of aluminum at 100 oC is placed in a 150g of H2O at 200 oC. The final temp. of the mix is 35 oC. What is the specific heat of the aluminum if the specific heat of the water is 4180 J/kgK?
22415 J
22415 g
32415 J
32415 g
