Model 10 Physics Practice Test-G12
Part One: Objective questions (multiple choice) “each question has one Mark
In the opposite electric circuit, the value of
the electromotive force (VB) is ….
1
A 12.5 V
B 15 V
C 17.5 V
D 20 V
Two copper rods of the same length (L) and 𝟏
L
𝟑
different cross-sectional area is connected as
2 shown in the figure. If the resistance of one of L
them is 9 Ω and the other has a resistance of 18 Ω.
Then the total resistance becomes... …
A 27 Ω
B 21 Ω
C 20 Ω
D 18 Ω
Page 1 of 26
Model 10 Physics Practice Test-G12
In the electric circuit, the ratio V1
between the reading of the two I 7R 7R 3R
V2
𝑽𝟏
3 voltmeters is equal to ..........
𝑽𝟐
A
𝟏
𝟐
B 𝟓
𝟕
C
𝟕
𝟓
D
𝟕
𝟑
Page 2 of 26
Model 10 Physics Practice Test-G12
𝐈𝟏
By using Kirchhoff's law, the potential 𝒂 𝐛
𝟔𝐕 𝟔𝛀
difference between the two points e,b is……..
4 𝐈𝟑 𝟏𝟎 𝛀
𝐟 𝐜
𝐈𝟐 𝟐𝟒𝛀
𝟑𝛀 𝟏𝟐 𝐕
𝐞 𝐝
A 4.25 v
B 4.21 v
C 4.98 v
D 4.76 v
Two straight wires carrying currents of equal magnitude perpendicular to the plane
of the page. If the point (Z) is located at the
5
midpoint between them.
so, the direction of the magnetic field at (Z) is...
A Upward to the page
B Downward to the page
C Left to the page
D Right to the page
Page 3 of 26
Model 10 Physics Practice Test-G12
A circular coil is placed perpendicular to a
magnetic field Out of the page.
6
If the coil rotates counterclockwise 90°.
so, the magnetic flux passing through the coil...
A remains constant
B increases
C decreases
D equals zero
In the opposite figure: two coils (y) and (x) are placed
perpendicular to magnetic flux lines, the area of coil (y) is
7 doubled of the area of coil (x), in order for x y
the same magnetic flux to penetrate them, it must rotate the
coil (y) by the angle…………
A 𝟑𝟎°
B 𝟔𝟎°
C 𝟗𝟎°
D 𝟒𝟓°
Page 4 of 26
Model 10 Physics Practice Test-G12
In the figure shown, Z Y X
the ratio between the resultant magnetic force 3I 5I
2I
8 per one meter from wire X to that
acts per one meter of wire Z is equal to...
d d
𝟒𝟎
A
𝟑
B 𝟏
𝟏𝟎
C 𝟖
𝟏
D 𝟐𝟎
𝟏
A galvanometer has a resistance of 120 Ω, if it is connected to shunt resistance to be
converted into an ammeter that measures a total current (I). if (0.18 I) passing
9
through the galvanometer’s coil, so the shunt resistance (Rs) is equal to ...............
A 18.62 Ω
B 82.38 Ω
C 26.34 Ω
D 38.82 Ω
Page 5 of 26
Model 10 Physics Practice Test-G12
The opposite graph represents the
relation between the maximum current
intensity is measured by an ammeter
10 and the reciprocal of the shunt
resistance. the
maximum potential difference between the two ends of the shunt resistance
It equals .........
A 0.1 V
B 1V
C 1.2 V
D 0.8 V
Page 6 of 26
Model 10 Physics Practice Test-G12
If the number of turns in the opposite coil is 50
turns and a magnetic flux of 0.3 web passes
through it. When the flux increases to 0.4 web
11 Within 0.1 Sec. so, the induced emf and the
direction of the induced current through the coil
relative to the two points a, b respectively.
A 100 V from b to a
B 100 V from a to b
C 50 V from a to b
D 50 V from b to a
A student conducted Faraday's experiment to generate an
emf induced across a solenoid. What is the procedure that N S
12
leads to increase the average value of the induced emf
generated across the coil?
A
Replace the coil with another with a smaller cross-sectional area
B
Replace the coil with another with a greater number of turns
C
Increase the time of movement of the magnet
D
Replace the coil with another with a smaller number of turns
Page 7 of 26
Model 10 Physics Practice Test-G12
In the opposite figure: 60 turns 100 turns
When the magnet is moved quickly in the direction
13 shown, the brightness of the lamp................
A vanishes
B increases
C decreases
D remains constant
The opposite figure shows a part of a closed circuit with a
straight wire (xy) of length 20 cm and it moves perpendicular
to the direction of the uniform magnetic flux at a speed of 2
14
m/s, an induced emf is generated between its two ends of 0.02
V. if the voltage of point (x) becomes greater than the voltage
of point y, so the value and the direction of the magnetic flux density is -----
A 0.05 T perpendicular into to the page
B 0.5 T perpendicular into to the page
C 0.05 T perpendicular out of the page
D 0.5 T perpendicular out of the page
Page 8 of 26
Model 10 Physics Practice Test-G12
The following figure shows four identical pieces of metal inside four identical coils. Both
ends of each coil are connected to an alternating current source. Assuming that the
effective value of AC voltage is constant while the frequency is different.
During the same period of time.
15
which of these pieces has the greater amount of heat?
A 1
B 2
C 3
D 4
Page 9 of 26
Model 10 Physics Practice Test-G12
The opposite graph represents the relation between
(Pw)S (W)
the power of the secondary coil and the power of the
76
primary for a step-down transformer. the ratio 60.
𝟏 8
between the number of turns in its coils .
16 𝟓 45.
If the current in the secondary coil is 2 A and the 6
(Pw)P (W)
30.
potential difference between the two ends of the 16 32 48 64 80
primary coil is 220 V, so the current intensity is the
primary coil is ...
A 0.1 A
B 0.2 A
C 0.3 A
D 0.4 A
Page 10 of 26
Model 10 Physics Practice Test-G12
The figure shows an electrical transformer whose
17 𝟓
number of turns is . If the value of R is 10.65 Ω,
𝟑
220 V R
IP IS = 10 A
so the efficiency of the transformer is ........
A 100 %
B 80 %
C 50 %
D 29 %
In the figure, which represents the reading of the hot 𝐴 𝐵
wire ammeter when an alternating current passes
18 through it.
Which of the following choices is correct in this case.?
𝑅
The rate of heat gain for the platinum wire is equal to the rate of heat loss to the
A
surrounding medium.
The rate of heat gain for the platinum wire is greater than the rate of heat loss to the
B
surrounding medium.
The rate of heat gain for the platinum wire is smaller than the rate of heat loss to the
C
surrounding medium.
The rate of heat gain for the platinum wire is equal to the rate of heat loss to the
D
surrounding medium= zero
Page 11 of 26
Model 10 Physics Practice Test-G12
In the oscillating circuit shown in the figure, if the self-
1 2
• •
inductance coefficient of a coil with zero ohmic
19 VB C 2H
resistance = 2 H, so the capacitance of the capacitor to
obtain a current with a frequency of 80 Hz is equal to .......................
A 1.98×𝟏𝟎−𝟔 μF
B 1.58 μF
C 1.98×𝟏𝟎−𝟔 F
D 1.58×𝟏𝟎−𝟒 F
An oscillating circuit at resonance state of frequency (f). If the capacitance of the
20 capacitor is doubled and the inductance of the inductor is doubled. What is the
frequency of the new resonance state?
A
½f
B 2f
C
4f
D ¼f
Page 12 of 26
Model 10 Physics Practice Test-G12
The opposite figure shows the collision scattered photon
Incident photon
of an X-ray photon with a free electron. 𝟕
( λ)
(λ) 𝟓
21 So, the lost energy from the incident
electron
photon is .......... of its original energy.
scattered
electron
A 𝟕
𝟏
B 𝟕
𝟐
C 𝟏
𝟕
D 𝟐
𝟕
If you know that the mass of an electron is 𝟗. 𝟏 × 𝟏𝟎−𝟑𝟏 𝑲𝒈 and the mass of another
charged particle is 𝟏𝟔 × 𝟏𝟎−𝟐𝟖 𝑲𝒈. if the speed of the electron is three times that of
22
the charged particle, so the ratio between the wavelength associated the electron and
that associated the charged particle is equal to ..........
A 𝟏
𝟑
B 𝟓
𝟏𝟎𝟎𝟎
C 𝟏
𝟓𝟖𝟔
D 𝟏𝟏𝟕𝟐
𝟐
Page 13 of 26
Model 10 Physics Practice Test-G12
In the opposite figure represents the Planck´s curve
Radiation intensity
of the emitted radiation from a glowing body. The
23 ratio between the energy of an emitted photon at A B
point A to the energy of an emitted photon at Point
λ
B.............
A Greater than one
B Smaller than one
C Equal to one
D Equal zero
The diagram shows
E3
The transfer of an electron between excitation X
24 energy levels to the lowest energy level. the
E2
750 nm 1000 nm
wavelength of (X) that associated with the E1
transfer of an electron is equal to ……....
A 1500 nm
B 4500 nm
C 3000 nm
D 2250 nm
Page 14 of 26
Model 10 Physics Practice Test-G12
The figure shows the Coolidge tube that is used V1
to generate x-rays
If you know that the potential difference V2
25 between the cathode and anode is V1, and the
potential difference across the cathode is V2. So,
the wavelength of the photons of the continuous spectrum of the emitted X-rays can be
decreased by………….....
A increasing V1 only
B increasing V2 only
C decreasing both V1 and V2
D decreasing V1 and increasing V2
The figure shows the structure of (helium - neon)
laser device.
26 The neon (Ne) atoms are excited,
due to.......
A Its collision with component 2
B Its collision with the excited atoms of component 3
C It gains energy from component 1
D Its collision with unexcited atoms of component 3
Page 15 of 26
Model 10 Physics Practice Test-G12
27 Which of the following is correct?
A Laser light is characterized by high intensity.
B Ordinary light can be used in holography.
C Ordinary light has coherent photons, while laser light is incoherent.
The beam diameter of laser light increases during propagation over very long
D
distances.
Two light sources, each of them emits light in the green spectrum region. One emits ordinary
28 light while the other emits a laser beam. The energy of a photon of ordinary light is ......... the
energy of a laser beam photon.
A smaller than
B greater than
C doubled of
D equal to
Page 16 of 26
Model 10 Physics Practice Test-G12
A group of logic gates whose output X
NOT
AND 1
voltage is (1) as shown in the figure.
29 Which of the following inputs (X) and (Y) Y
OR
in the table?
achieve that?
Y X
A 0 0
B 0 1
C 1 1
D 1 0
Page 17 of 26
Model 10 Physics Practice Test-G12
30 Which of the following figure has the highest resistance to the passage of the electric current?
Page 18 of 26
Model 10 Physics Practice Test-G12
The opposite figure shows one of the logic gates.
𝐴
31 The number of probabilities in which the output is 𝐵 𝐴𝑁𝐷 𝑜𝑢𝑡𝑝𝑢𝑡
𝐶
(Low) is .......
A 3
B 5
C 7
D 8
Suppose the temperature of a pure silicon (Si) crystal and a copper wire are reduced to
32
absolute zero (0 K) The electrical conductivity...
A vanishes for silicon and increases for copper.
B vanishes for both silicon and copper.
C increases for both silicon and copper.
D vanishes for copper and increases for silicon.
Page 19 of 26
Model 10 Physics Practice Test-G12
Second, Objective questions (multiple choice) “each question is two marks”
8Ω 0.03 A 10 Ω
In the circuit shown, the value of resistance R is .................
33 ohms
R
1.5 V
r=0
A 5
B 2.5
C 2.4
D 0.3
In the electric circuit,
3Ω
The potential differences across each of the 6 Ω
8Ω
6Ω
and 3 Ω resistors are……
I 10 Ω
12 V, r = 1 Ω
The voltage across 6 𝛀 The voltage across 3 𝛀
34
A 3v 6v
B 3v 3v
C 9v 3v
D 9v 6v
Page 20 of 26
Model 10 Physics Practice Test-G12
From the opposite electric circuit. Which C1 = C
of the following choices is correct?
35
V
C2 = 2 C
The voltage across each The accumulated charge on each
capacitor plate from each capacitor
A V1 = ½ V2 Q1 = 2 Q2
B V1 = ½ V2 Q1 = Q2
C V1 = V2 Q1 = ½ Q2
D V1 = V2 Q1 = Q2
In the circuit shown: If the number of turns per unit length of
30 Ω 3Ω
the coil is 150 turns/meter, so the magnitude of the
36
magnetic flux density at the midpoint of the axis inside the 15 Ω
coil is equal to ....... 26 V
A 1.26×𝟏𝟎−𝟒 T
B 6.3×𝟏𝟎−𝟓 T
C 6.3×𝟏𝟎−𝟒 T
D 1.26×𝟏𝟎−𝟓 T
Page 21 of 26
Model 10 Physics Practice Test-G12
Form the figure:
𝟖𝟒
A
The magnitude and direction of the magnetic flux density at 𝟏𝟏
37 the center P.....
60°
A 4×10-5 T out of the page
B 4×10-7 T into the page
C 4×10-5 T into the page
D 4×10-7 T out of the page
A sensitive galvanometer that can measure a V (V)
maximum current intensity of (Ig). the 125
100
galvanometer contains several multiplier
75
resistors each separately to convert it to 50
38 25
voltmeter each time, The opposite graph
R (Ω)
250 500 750 1000 1250
represents the relation between the
maximum potential difference measured by a voltmeter (V) and total resistance for the
voltmeter (R), the value of Ig is...
A 0.1 A
B 0.2 A
C 0.25 A
D 0.5 A
Page 22 of 26
Model 10 Physics Practice Test-G12
A coil with a resistance of 15 Ω and a self-inductance coefficient of 0.7 H is connected to
39 a direct current source of electromotive force of 140 V. The rate at which the current grows
at the moment of reaching the passing current 90% of its maximum value is --------
A 40 A/S
B 20 A/S
C 60 A/S
D 80 A/S
Which one of the following diagrams correctly represents the
current generated by a dynamo is composed of several coils with
small equal angles between them and commutator that is divided
into number of segments double of the number of used coils?
40
I I I I
t t t t
D C B A
A Figure A
B Figure B
C Figure C
D Figure D
Page 23 of 26
Model 10 Physics Practice Test-G12
In the electric circuit shown:
If the coils are identical and the value of the
inductance coefficient for each of them is 0.3 H
41
and assuming that the ohmic resistance of each of
them and the mutual inductance between them are neglected. If the value of the total
inductive reactance is 12.56 Ω, so the frequency of the current is equal to ………....
A 50 Hz
B 60 Hz
C 20 Hz
D 10 Hz
In the circuit shown, when a current of frequency
(f)passes through, Xc=R, so if the frequency is
reduced to 0.5 f.
42
The ratio between the impedance in the second case
to the impedance in the first case is equal to ….....
A √
𝟐
𝟑
B √
𝟑
𝟐
C √
𝟐
𝟓
D √
𝟓
𝟐
Page 24 of 26
Model 10 Physics Practice Test-G12
If an electronic microscope is used to examine a particle with a length of 0.31 A°, the
43 potential difference between the anode and cathode must not be less than ..............
A 820.2 V
B 1568.4 V
C 1250.2 V
D 1722.4 V
In the hydrogen atom, if the electron returns from the second energy level to the first
energy level, a photon with frequency υ is emitted. Therefore, when the electron returns
44
from the fourth energy level to the first energy level, a photon with frequency ……… is
emitted.
A 1.25 υ
B 2υ
C 4υ
D 16 υ
Page 25 of 26
Model 10 Physics Practice Test-G12
Third, Essay questions (each question two marks)
The opposite graph represents the relation emf (V)
between the magnitude of the emf induced in a 0.8
secondary coil and the rate of change of 0.6
current in primary coil 0.4
45 0.2
(∆I/∆t). calculate: ∆𝐈
(A/s)
∆𝐭
[A] Coefficient of mutual inductance? 0.1 0.2 0.3 0.4
[b]the amount of emf induced generated in the
Secondary coil when the time rate of change in current is (0.25A/s)
An ohmmeter consists of a millimeter, a resistor, and a 6 V battery. Its pointer
deflects to the end of the scale when a current of 1 mA passes through it. Its two
ends touch, and its pointer deflects to the maximum degree. Calculate the value of
46
the resistance that connects to its ends, causing the pointer to deflects to:
(a) Half scale.
(b) Three-quarters of the scale
Page 26 of 26
