Academic Year 2016- 2017
First Term
Science Revision sheets
PHYSICS ( Answer key )
Name: ________________________
Date: _______________
Grade: 10
(A)
Section: _____________
Science Practice :
Q1: Choose the letter of the choice that best answer the questions:
1.
What term is defined as the energy transferred between objects with
different temperatures?
a. internal energy
b.
work
c. heat
d.
thermal equilibrium
2. Which of the following is proportional to the average kinetic energy of
particles in matter?
a. heat
b. temperature
c. thermal equilibrium
d. internal energy
3. The temperature of the air is measured as 235 K. What is this
temperature equal to in degrees Celsius?
a. 508C
b. 203C
c. 38C
d. 68C
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4.
If energy is transferred spontaneously as heat from a substance with a
temperature of T1 to a substance with a temperature of T2, which of the
following statements must be true?
5.
a. T1 < T2
b. T1 = T2
c. T1 > T2
d.
More information is needed.
Which of the following statements best describes a state of thermal
equilibrium between two systems?
a. Both systems have the same mass.
b. Both systems have the save volume.
c. Both systems have the same temperature.
d. Both systems contain the same amount of internal energy
6. What is the process by which energy is transferred by the motion of cold
and hot matter?
7.
a. thermal conduction
b.
thermal insulation
c. convection
d.
radiation
The use of fiberglass insulation in the outer walls of a building is
intended to minimize heat transfer through what process?
a. conduction
c. convection
b. radiation
d. vaporization
8. Which of the following is proportional to the kinetic energy of atoms and
molecules?
a. elastic energy
c. potential energy
b. temperature
d. thermal equilibrium
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9.
As the temperature of a substance increases, its volume tends to
increase due to
a. thermal equilibrium.
c. thermal expansion.
b. thermal energy.
d. thermal contraction
10. Energy transferred as heat occurs between two bodies in thermal
con-tact when they differ in which of the following properties?
a. mass
c. density
b. specific heat
d. temperature
11. What is the quantity of energy needed to raise the temperature of a unit
mass of a substance by 1C called?
a. latent heat
c. specific heat capacity
b. internal energy
d. thermal energy
12. Which of the following are ways in which energy can be transferred to or
from a substance?
a. heat and internal energy
c. work and internal energy
b. heat and work
d. heat and kinetic energy
13. What is a set of particles or interacting components that is considered a
distinct physical entity called?
a. an engine
c. a system
b. an environment
d. an ideal gas
14. What temperature has the same numerical value on both the Celsius and
the Fahrenheit scales?
a. 40
c. 40
b. 0
d. 72
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15. Which temperature scale is used widely in science, and is applied to nonscientific uses throughout most of the world?
16.
a. Celsius
c. Rankine
b. Fahrenheit
d.
Kelvin
What term is defined as the energy transferred between objects with
different temperatures?
a. internal energy
c. work
b. heat
d. thermal equilibrium
17. What must be true if energy is to be transferred as heat between two
bodies in physical contact?
a. The two bodies must have different volumes.
b. The two bodies must be at different temperatures.
c. The two bodies must have different masses.
d. The two bodies must be in thermal equilibrium.
18. During a phase change, which of the following properties does not change?
a. internal energy
c. physical state
b. temperature
d. volume
19. If energy is transferred from a table to a block of ice moving across the
table, which of the following statements is true?
a. The table and the ice are at thermal equilibrium.
b. The ice is cooler than the table.
c. The ice is no longer 0C.
d. Energy is being transferred from the ice to the table.
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20. If there is no change in the internal energy of a gas , even though energy
is transferred to the gas as heat and work , what is the thermodynamic
process that the gas undergoes called ?
a. adiabatic
c. isothermal
b. isovolumetric
d. isobaric
II. Fill in the blanks :
[ isothermal , work , adiabatic , isovolumetric , system ,
pressure , 273.15 , thermometer , absolute zero , heat ]
1.
____________________
is a set of particles or interacting components
System
considered to be distinct physical entity for the purpose of study .
2. ___________________
is a measure of how much force is applied over
Pressure
a given area .
3. A thermodynamic process that takes place at constant volume so that no
Isovolumetric
work is done on or by the system is called _________________
process.
4. Thermodynamic process that takes place at constant temperature is called
Isothermal
______________________
process .
5. In a thermodynamic process no energy is transferred to or from the
Adiabatic
system as heat is called __________________
process.
Work
6. For gases at constant pressure , _____________
is defined as the
product of gas pressure and the change in the volume of gas .
7. Thermal equilibrium is the basis for measuring temperature with
Thermometer
_____________________
273.15
8. T = Tc + _____________
Absolute zero
9. The temperature of 0 K is often referred as ____________________.
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Heat
10. ____________________
is the energy transferred between objects
because of a difference in their temperature.
III. State whether the statement is ‘ True ’ or
‘ False ’ :
1. When the gas volume remains constant, there is no displacement and no
work is done on or by the system. ____________
True
2. During adiabatic process , the temperature of the system does not
False
change . _____________
True
3. Isovolumetric process takes place inside a bomb calorimeter . _________
4. All the object have internal energy, which is the sum of kinetic and
True
potential energies of their molecules . _______________
5. A temperature difference of one degree is the same on the Celsius and
Kelvin scale . _____________
True
6. Energy is transferred as heat from the lower –energy particles to a higher
energy particles. ________________
False
7. Heat is indicated by the symbol ‘ Q ’ . _____________________
True
False
8. Potential energy is the energy of an object due to its motion . ________
9. T = Tc + 32.0
False
_________________
10. The net energy transferred is zero when the thermal equilibrium reached.
True
________________
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IV. Match the following :
A
Answ
B
er
1. Temperature
d
a
temperature does not change
2. Isovolumetric
f
b zero
3. Isothermal
a
c combination of substances
4. Work
g
d. Average kinetic energy
5. PE + KE + U
b
e without changing temperature
6. System
c
f a steel tank of gas being heated
7. Specific heat capacity
h
g pressure x volume change
8. Phase change
e
h calorimeter
V. Answer the following :
1. What happens to the temperature and internal energy of the gas and
water after the combustion reaction ?
The water’s temperature and internal energy increases as the gas’s
temperature and internal energy decreases .
2. What will happen when we hold our hands apart after vigorously rubbing
our hands ? Explain .
Hands cool off ;Energy is transferred as heat from the hands to the air .
3. In what ways can the internal energy of a system be increased ?
Energy transfers to the system as heat or as work.
4. When an ideal gas expands adiabatically , it does work on its surrounding .
Describe the various transfers of energy that take place .
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Work done by gas cause a decrease in U and T ( temperature ) of gas and
an increase in U of surroundings .
5. A hot copper pan is dropped into a tub of water . If the water’s
temperature rises, what happens to the temperature of the pan ? How will
you know when the water and copper pan reach thermal equilibrium ?
6. Is there more mercury in the tube at 500C than there is at 00C ?
No , because of thermal expansion , the same amount of merury occupied a
larger volume at 500C
7. A pan of water is heated from 230C to 780C . What is the change in its
temperature on the Kelvin and Fahrenheit scales ?
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Bonus questions:
1. Paint from and aerosol can is sprayed continuously for 30 s. The can was
initially at room temperature , but now it feels cold to touch . What type
of thermodynamic process occurs for a small sample of gas as it leaves the
high – pressure interior of the can and moves to the outside atmosphere ?
Adiabatic
2. One day it was – 400C at the top of Mont Blance and – 400F at the top
of Mount Whitney . Which place was colder ?
Neither ( - 400C = - 400F )
3. A pan of water is heated from 230C to 780C . What is the change in its
temperature on the Kelvin and Fahrenheit scales ?
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