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WorksheetsPhysics Heat (Thermal Equilibrium & Heat Capacity)
Total questions: 46
Worksheet time: 49mins
∆Q = mc∆T
If
∆Q = 100 J
m = 10 g
∆T = 2 °C
What is c (in J/kgK) ?
Two bodies are said to be in thermal equilibrium if
rates of heat transfer between them are equal
rates of heat transfer between them are not equal
no heat flow between them
maximum heat flow between them
The two bodies are said to be in thermal equilibrium if
no heat and equal temperature
small net flow of heat and low temperature
no net flow of heat and equal temperature
maximum flow of heat and maximum temperature
Which of them are not example of thermal equilibrium
making a cup of warm drinking
cooking using oven
cooling with refrigerator
putting water tank on the top of building
small rock, large rock and a water (same mass to large rock) have placed under sunlight. After 7 minutes, Which statement is correct
they have equal temperature
the water is hottest
small rock is hottest
large rock absorb higher heat
A 100 g iron nut with temperature of 90° C inserted into a 1 kg of water at 24° C. A possible equilibrium temperature of them is
30° C
92° C
20° C
0° C
What is physics concept used in thermometer?
specific latent heat
specific heat capacity
Charles's Law
thermal equilibrium
"Amount of heat energy required to change 1° C of 1 kg substance". This is definition of
heat capacity
specific heat capacity
latent heat
specific latent heat
Which is formula related to specific heat capacity
Q=mcθ
W=mg
Q=mL
W=Fs
what is unit for specific heat capacity?
J
J kg−1 °C−1
N kg−1C−1
Nm−1
the value of specific heat capacity of water obtained in experiment was larger than actual value. This happened because of
heat absorbed from surrounding
no heat flow
heat overflow
heat lost to surrounding
low specific heat capacity of the material means the temperature of the material
can easily increase
can easily maintained
can easily static
can easily change
same mass of object, A and B is heated at the same time. After 5 minutes, the temperature of the object A shows lower magnitude, This indicates the value of specific heat capacity of object A is
higher than object B
lower than object B
equal to object B
same to object B
Sea and land breeze occur because the specific heat capacity of land is ____________ specific heat capacity of sea.
higher than
lower than
equal to
same to
water used as coolant agent in car radiator because water
have low specific latent heat of vaporization
have high specific latent heat of vaporization
have low specific heat capacity
have high specific heat capacity
When a body absorbs heat, its temperature will
increase.
decrease.
remains constant.
Which statement defines the thermal capacity (heat capacity) of a solid body?
the energy needed to melt the body without a change in temperature
the energy needed to raise the temperature of the body by one degree Celsius
the increase in the volume of the body when its temperature is raised by one degree Celsius
the total amount of internal energy in the body
The heat capacity of a substance depends on the followings, EXCEPT:
mass of substance.
type of substance.
Quantity of heat supplied.
ice point and steam point.
A metal has a specific heat capacity of 360 J / (kg 0C). An object made of this metal has a mass of 2.0 kg.
What is the thermal capacity (heat capacity) of the object?
180 J / 0C
180 J / kg
720 J / 0C
720 J / kg
The specific heat capacity of a substance is the quantity of heat required to
melt 1 kg of the substance.
raise the temperature of the substance by 10C.
raise the temperature of 1 kg of the substance by 10C.
A liquid X of mass 1 kg requires 3800 J of heat to raise its temperature by 10C.
Calculate the total heat required to raise the temperature of 1 kg of liquid X by 30C.
3800 J
7600 J
11 400 J
The time taken by an electric heater to raise the temperature of 4 kg of water from 250C to 300C is 1 minute. If the specific heat capacity of water is 4200 J kg-1 oC-1, calculate the power of the heater.
70 W
140 W
700 W
1400 W
The specific heat of platinum is 0.133 J/g°C. How much heat(Q) is released when a 10 g piece of platinum cools from 100°C to 50°C?
66.5 J
665 J
0.0266 J
0.665 J
The diagram shows the temperature – time graph of a liquid . The liquid is heated by using a 0.4 kW heater . The mass of the liquid is 0.2kg. What is the specific heat capacity of the liquid?
1000 J kg-1 oC-1
2000 J kg-1 oC-1
3000 J kg-1 oC-1
4000 J kg-1 oC-1
A beaker is filled with 2 kg of water at 30oC .
A plumbum sphere of mass 1.5 kg at 90oC is placed in the beaker. The final temperature reached by the water and the sphere are 31.5oC
What is the specific heat capacity of plumbum?
( specific heat capacity of water = 4200 J kg-1 oC-1)
144 J kg-1 oC-1
568 J kg-1 oC-1
1425 J kg-1 oC-1
2070 J kg-1 oC-1
A 240 V, 2 kW electric heater is immersed in
6 kg of a liquid and switched on for 5 minutes.
What is the rise in temperature of the liquid?
( specific heat capacity of the liquid = 4.2 x 103 J kg -1 o C-1 )
10 oC
15 oC
18 oC
24 oC
A 800 watt kettle holds 0.5 kg of water at
30 o C. It is turned on until the water boils.
What is the time taken to boil the water?
(specific heat capacity = 4.2 x 103 J kg -1oC-1)
76 s
168 s
184 s
340 s
Why is the pot's handle made of high specific heat capacity material?
To increase the mass of the pot
To reduce the increase in temperature
To increase the melting point
To reduce the expansion of the handle
At night, land cools down faster than sea. Which statement explains the situation?
Solid releases heat faster than liquid
Sea absorbs heat more than land during night
The breeze blows from the sea to the land during night
Specific heat capacity of sea water is greater than land
The lengths of the mercury thread in a thermometer is 20 cm at 100oC. What is the length of the thread when the thermometer is placed in a substance at 25oC.
4 cm
5 cm
10 cm
12 cm
A thermometer which is not calibrated is marked 200 small divisions between ice point and steam point. When the thermometer is inserted into a liquid , the level of the mercury at mark 120. What is the temperature of the liquid.
-20oC
40oC
60oC
80oC
