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)Introductory Physics(PHYS 1411)
FALL 2012
Mawadah Al-Shehri 201001085
Dalya Al-Wasifir
201000741
Bashayer Alsaleh
201100939
Question chapters (23-28)
204
Part 1:
1- what is potential difference?
charge flows from one end to the other.
2- what is Ohm’s Law?
States that the current in a circuit varies in direct proportion to the potential
difference, or voltage, and inversely with the resistance.
3- what is Electric Power?
Rate at which electric energy is converted into another form.
4- What is Conductor?
Any material having free charged particles that easily flow through it when an
electric force acts on them.
5- What is Semiconductors?
Refers to materials that can alternate between being conductors and insulators
6- What is Superconductors?
Materials with zero electrical resistance to the flow of charge
7- what is Reflection?
When the light is returned into the medium from which it came.
8- what is Law of Reflection ?
the angle of reflection equals the angle of incidence.
9- what is Refraction ?
When light bends in going obliquely from one medium to another.
10- what is Dispersion ?
Process of separation of light into colors arranged by frequency.
Part 2:
(T) or (F) :
1- Current in a circuit is dependent on voltage and electrical resistance. (T)
2- rubber is much less resistance than copper of the same size .(F)
3- Coulomb’s Law is Relationship between voltage, current, and resistance.(F)
4-For twice the resistance and twice the voltage, current will be unchanged. (T)
5-the unit of electric current is ohm.(F)
6- The law of reflection applies to sound and light. (T)
7- Illusions caused by dispersion. (F)
8-4 ampere equal 1 coulomb of charge per second. (F)
9-Cause of Refraction by change in speed of light.(T)
10-the unit of power is (watts). (T)
Part 3:
1. a man that is 1.50 meter tall, to see his full height he needs a mirror ia at
least :
 0.33 m tall
 0.50 m tall
 0.75 m tall
 1 m tall
2. You wish to photograph your reflected image on a plane mirror, while you
are standing 2.5 meter away from the mirror holding the camera beside
your head. You need to set the distance for:
 6m
 6.25 m
 7m
 7.25 m
3. A child that is 0.30 meter tall, to see his full height he needs a mirror is at
least:
 0.15 m tall
 0.33 m tall
 0.50 m tall
 0.15 m tall
4. Suppose that two point charges each with a charge of +10 coulomb are
separated by a distance of 1 meter. Determine the magnitude of the
electrical force of repulsion between them:
 9n
 900,000 n
 9,000,000 n
 9,000,000,000 n
5. If you walk towards a mirror at a speed of 2 m/s, the relative speed
between you and your image is:
 1 m/s
 2m/s
 3m/s
 4 m/s
6. When a 3-V battery is connected to a resistor, the current in the resistor is
1-amp. What is the resistors value?
Current = ( voltage/ resistance)
3 ohm
7. The current thought a 2-omh resistor connected to a 6-v what is power
supply?
Current = ( voltage/ resistance)
3 ohm
8. A 9-ohm resistor has a 0.50 current in it. What is the voltage across the
resistor?
Current = ( voltage/ resistance)
4.5
9. A circuits containing a voltage source of 1.5-v and a 0.50 Amp of current
what is the value of resistor?
Current = ( voltage/ resistance)
3 omh
10. A circuits containing a 6-omh resistance and a 0.25 Amp of current, what
is the value of voltage:
Current = ( voltage/ resistance)
1.5 V
Part 4:
Full in the blank:
1.
2.
3.
4.
5.
The types of lenses: converging and diverging.
Resistors circuit elements that regulate current inside electrical devices.
The action of lenses depends mainly on refraction.
Circuits connected in two common ways: series and parallel.
The virtual image in the convex mirror is smaller and closer to the mirror
than the object.
6. Focal point point at which all the light rays come together.
7. The unit of power watts
8. The relationship between the length and resistance is directly.
9. The total resistance in the series circuits is the sum of individual
resistance.
10. Aberration distortion in an image.
Part 5:
Chose the correct answer:
1. Flows in one direction only:
 Direct current (dc)
 Alternating current (ac)
 Both (dc) and (ac)
2. When their difference in potential between two points the Charges in
conductor flow from:
 Lower potential to higher potential
 Higher potential to lower potential
 The charges are not flow.
3. Objects submerged in water appear:
 Closer to the surface.
 Farther to the surface.
 The same.
4. Current in a circuit is dependent on :
 Voltage
 Electrical resistance in ohms.
 Both of them
5. Example of semiconductor:
 Rubber
 Silicon
 Aluminum
6. The virtual image in the concave mirror is :
 larger
 smaller
 The same
7. When their changed in speed of light, _______ will happened:
 Reflection
 Dispersion
 Refraction
8. Rainbow is results of:
 Reflection
 Dispersion
 Refraction
9. Atmospheric refraction is the cause of :
 Rainbow
 Mirages
 None of their
10. In the parallel circuit as the number of parallel branches is _____ the
overall resistance of the circuit is _________:
 Increased, increased.
 Decreased, increased.
 Increased, decreased.