Name of the student:
Date:
Module Exam: Physics
Programme:
BT; MEACS; CS;TCS
Index No:
Do not make any other notes on the Answer sheet than answers in the Part I table !
Duration of the exam; 90 min.
ANSWER SHEET
Assessement
Part I
max 30
Part I.
Question
Choice
Score.
Answers:
1
Part II
max 10
2
3
Part III
max 10
4
5
Total score
6
7
8
9
10
correct
incorrect
total
For each statement or question below, write on in the above table the letter of your choice of those given, best completes the statement
or answers the question.
Correct answer = +3 pt, incorrect or lack of answer = −1 pt.
1. An acoustic wave travels in the water in which its phase speed is 1.49⋅103 m/s, then the wave enters the air . The phase speed in the air :
A
Decreases and its
frequency does not change
B
Increases and its
frequency does not change
C
Does not change and its
frequency increases
D
Decreases and its frequency increases
2. The total energy in damped harmonic oscillations is given by the expression:
A
B
1
E = kA 2 0 e − β t
2
C
1
E = kA0 e − β t
2
D
1
E = kA 2 0 e − 2 β t
2
1
2
E = kA0
2
3. Proton moves in the magnetic field B. When the magnitude of B increases 2 times the proton’s angular velocity:
A
Decreases 2 times
B
Increases 2 times
C
Does not change.
D
Increases 4 times
4. In the polar dielectric material:
A
Molecules do not posses
permanent dipole moments
B
Dipole moments are induced
in the material whenever it is
placed in the external
electrostatic field
5. The phenomenon of electromagnetic induction is responsible for:
A
Generation of the current in a
circuit which moves in the
magentic field.
6. In the Hall Effect :
A
B
C
Molecules posses permanent
dipole moments even in the
absence of the external fields
Generation of the magnetic field in
a circuit in which current is
changing.
Transverse electric field is generated
in a conductor placed in the magnetic
field.
B
Electric current is generated in
the conductor placed in the
magnetic field.
kgm 2
A2 s 2
7. The SI unit of the certain quantity is
C
A
D
There are ions in the material able to
freeely change their position.
Generation of the force on a current
carrying wire placed in the magnetic
field.
C
The transverse magnetic
field is generated in a
current carrying
conductor.
D
D
Generation of the magnetic
field by the current
carrying wire.
The frequency of the
electromagnetic wave chan ges
when reflected from the walls of
huge rooms.
That unit’s formal name and symbol is:
Volt V
B
Tesla T
C
Henr H
D
Weber Wb
8. Which of the following graphs illustrating Ohm’s law is correct?
A
B
C
i
U
D
R
U
U
U
i
i
9. Which of the following statements is correct
A
Capacitance is proportional to
the charge gathered on the
capacitor’s plates.
B
Capacitance is proportional to the voltage between
capacitor’s plates..
C
When you apply the constant voltage
U to the capacitor’s plates for an
infinitely long time you can charge the
capacitor with the infinite charge.
D
The energy stored in the
capacitor at the given voltage is
proportional to the capacitance
of the capacitor.
10 The sample of ferromagnetic material when placed in the non uniform magnetic field will be:
A
pulled into the field
B
Pushed out from the field
C
Not affected by the field
1
D
Oriented perpendicularly to the
field lines
Part II (max 10 points)
Solve the following problem. Provide detailed explanation of all steps and simplifications. Complement your
solutions with diagrams of objects, vectors, etc.
Find the electrical capacitance of the cylindrical capacitor of area length L and radii x y filled with the dielectric material
of dielectric constant is є.
Part III (max 10 points)
Describe in details the physical problem or principles of operation, construction details and purpose of the
device
The cyclotron.
(or: Magnetic properties of materials – microscopic view).
Exam Policies and Procedures
1.
2.
3.
4.
•
•
•
•
•
•
•
•
•
Student is obliged to bring with into the testing room and display her/his ID with photo for identification purposes. If there is
a discrepancy in a student's identification, the student may be dismissed from the testing room.
You may not bring cell phones, MP3 players, pagers, or PDAs into the testing room.
You may not consult textbooks, other students, any electronic device (including wireless e-mail devices or cell phones), or
any other resource during the assignment or during any other unscheduled breaks.
When the personnel find that there is misconduct in connection with an exam, students may be dismissed from the exam
room given the negative result of the whole exam. Students involved in any exam misconduct will be asked to turn in their
exam materials and leave the testing room.
Misconduct includes, but is not limited to, the following:
Obtaining improper access to the exam, or a part of the exam, or information about the exam.
Using any prohibited aids.
Taking food or drink into the testing room.
Leaving the testing room without permission.
Attempting to remove from the testing room any part of the exam or any notes relating to the exam.
Copying from another student's work or a published work.
Attempting to give or receive assistance, or otherwise communicate, in any form, with another person about the exam during
the exam administration.
Attempting to take the exam for someone else.
Creating a disturbance.
2