Model 4 Physics Practice Test – G12 Part One: Objective questions (multiple choice) “each question has one Mark In the electric circuit in the opposite figure, which of the following choices correctly shows the readings of V1 and V2 when R2 increases? 1. (V2) (V1) 2. A decreases increases B increases decreases C increases increases D decreases decreases A copper wire has a cross-sectional diameter of 4 cm and a length of 5 m. Its resistivity is 1.72×10-8 Ω.m. The resistance of the wire is equal to.......... (Given that π=3.14) -5 A 6.84×10 Ω -7 B 6.84×10 Ω -6 C 1.72×10 Ω -6 D 6.35×10 Ω 1 Model 4 Physics Practice Test – G12 You have three different resistors (4 ο, 8 ο, and 12 ο). Which of the following circuits 3. will have an equivalent resistance of 11ο? 8Ω A 12 Ω 4Ω B 8Ω 12Ω 4Ω C 12 Ω 8Ω 4Ω D 4Ω 8Ω 12 Ω 2 Model 4 Physics Practice Test – G12 In the electric circuit in the figure: 4. The flowing current through the resistor πΉπ is ….. A 0.14 A B 0.29 A C 0.42 A D 0.56 A In the figure: If a long wire has a resistance of 2 ο and a potential difference of 4 volts between its terminals, then The magnitude and direction of the flux density at point (Z) are, 5. respectively are..…… 3cm Cm A 1.3×10-5 T - Out of the page B 1.3×10-5 T - Into the page C 5.3×10-5 T - Out of the page D 5.3×10-5 T - Into the page 3 Z Model 4 Physics Practice Test – G12 From the figure: When iron filings are sprinkled 6. X around the wires, which of the following figures shows the shape of the iron filings around the wires Cardboar d A B A. B. B. C D. C. D. D 4 Y Model 4 Physics Practice Test – G12 The opposite figure shows an electric current of 2A passing through a wire in the form of a circular arc with a radius of 7. 0.02m. The direction and magnitude of the magnetic flux density at the center (M) are, respectively, ................. A Into the page - 2.5×10-3 T B Out of the page -7×10-6 T C Into the page - 5.9×10-5 T D Out of the page - 3.5×10-4 T 5 Model 4 Physics Practice Test – G12 Two parallel wires, each carrying a current as shown in the figure. The net magnetic flux density between them at a distance of 8 cm from the wire carrying a current of 4 A, is equal to ............. 2A 4A 8. 8 Cm 10 Cm A 3×10-7 T B 3×10-5 T C 1×10-7 T D 1×10-5 T .9 A moving-coil galvanometer has a scale that is divided into ten divisions where each division represents 5μA. Then the current required for the pointer to deflect to the midpoint of the scale is equal to …………. A 10 μA B 15 μA C 25 μA D 50 μA 6 Model 4 Physics Practice Test – G12 10. An ammeter has a resistance of 50ο. The value of theπ shunt resistor required to reduce the sensitivity of the ammeter to A 10 ο B 12.5 ο C 25 ο D 50 ο π of its value is............. 11. Which of the following increases the induced electromotive force (emf) produced in a coil (in a closed circuit) when a magnet is moved closer to it? A Decreasing the relative speed between the magnet and the coil B Increasing the relative speed between the magnet and the coil C Decreasing the number of turns of the coil D Decreasing the permeability of the medium 7 Model 4 Physics Practice Test – G12 The graph that shows the relationship between the induced electromotive force produced in a coil and the time rate of the of the change of magnetic flux 12. (emf) β∅π ( ) is…….. βπ A πππβ¬ β∅π βπ B πππβ¬ β∅π βπ C πππβ¬ β∅π βπ D πππβ¬ β∅π βπ 8 Model 4 Physics Practice Test – G12 In the shown figure, a magnet is pulled out of a coil connected to a galvanometer. The direction of the produced induced current through the 13. galvanometer from ......... and the magnetic pole formed at the terminal (X) is ............. A B to point A – north B B to point A – south C A to point B – north D A to point B – south 9 X Model 4 Physics Practice Test – G12 In the shown figure: In which direction should the wire be moved so that the direction of the induced current is from A to B as shown in the figure? 14. A Upward B Downward C Towards the north pole of the magnet D Towards the south pole of the magnet 10 Model 4 Physics Practice Test – G12 15. When a metal core is placed inside a solenoid whose wires are double wounded before being coiled, and an alternating current is passed through the coil, then... A The eddy current will be in the opposite direction B The eddy current will be in the same direction C The thermal energy in the metal core increases. D No thermal energy is produced in the metal core 11 Model 4 Physics Practice Test – G12 In an ideal transformer, one of its coils has an electric power of 600 W. If the 16. primary coil voltage is 180 V and the current through the secondary coil is 4 A then……… The type of the transformer is The secondary coil voltage is A step-down 100 V B step-up 100 V C step-up 150 V D step-down 150 V A step-down transformer with an efficiency of 70% is used to operate an electric 17. lamp with a potential difference of 22 V using an AC source with voltage of 220 V. If the number of turns in the secondary coil is 350 turns, then the number of turns in the primary coil is ............. turns. A 240 B 500 C 2450 D 3500 12 Model 4 Physics Practice Test – G12 18. The wire of hot wire ammeter is mounted on a metal plate that has the same thermal expansion coefficient as the wire, and this is ... A To increase the amount of thermal expansion of the wire B To decrease the efficiency of the device in measurement C To avoid the zero error D To quickly return the pointer to zero when the current is turned off. An oscillating circuit consisting of a capacitor of capacitance C millifarad and a coil of self-inductance L millihenry. This circuit receives a wave with 19. a frequency of 600 kHz. If another coil of self-inductance 2 L millihenry and another capacitor of capacitance 2 C millifarad are used, the frequency of the wave that can be received will be..... A πππ π€ππ³ B πππ π€ππ³ C πππ π€ππ³ D πππ π€ππ³ 13 Model 4 Physics Practice Test – G12 The figure represents a circuit in a resonant state. When the iron core is pulled out of the coil, the reading of the hot-wire ammeter …... 20. π΄ A Increases B decreases C remains constant D equal zero 21. The ratio between the speed of a blue light photon in the space and the speed of a red-light photon in the space is……...... A greater than one B less than one C equal to one D equal to zero 14 Model 4 Physics Practice Test – G12 22. When a gamma ray photon collides with a free electron, which of the following choices is correct? Momentum of the scattered photon The wavelength associated with the scattered electron A decreases decreases B Increases decreases C decreases Increases D Increases Increases 15 Model 4 Physics Practice Test – G12 Which of the following graphs shows the radiation curves emitted from two black bodies (X) and (Y) if you know that the temperature of (X) is greater 23. than the temperature of (Y)? A y I π± λ B π± y λ C x I π λ D π² I π± λ 16 Model 4 Physics Practice Test – G12 The figure represents a standing wave accompanying an electron rotating around the nucleus of a hydrogen atom at 24. a certain level. The radius of the orbit in which it rotates is….... A B π= π= ππ ππ π ππ C ππ π= π D π= π π 17 Model 4 Physics Practice Test – G12 The common feature between the characteristic XI ray photons (1) and (2) is that they have the .25 (2) (1 same……… λ A energy B intensity C frequency D speed The number of coherent photons emitted by neon atoms in a helium-neon laser increases due to the effect of .............. semi-permeable mirror Reflective mirror 26. discharge tube + ππ·πΆ − high continuous voltage difference A decreased of electrical discharge inside the quartz tube. B decreased the percentage of the atoms of helium compared to atoms of neon in the active medium C successive reflections inside the resonant cavity D decreased the percentage of the atoms of neon compared to atoms of helium in the active medium 18 Model 4 Physics Practice Test – G12 27. A 3D image can be formed by using laser, because the photons of laser beams are …… A parallel B Spectral purity C High intensity D coherent The figures represent the energy levels of an atom: 28. πΈ2 πΈ2 πΈ2 πΈ2 πΈ1 πΈ1 πΈ1 πΈ1 figure 2 figure 3 figure 1 figure 4 Which one of these figures represents a state of stimulated emission? A Figure 1 B Figure 2 C Figure 3 D Figure 4 19 Model 4 Physics Practice Test – G12 The figure shows an equivalent electric circuit to a combination of logic gates. A 29. C B Which of the following logic gates represents the shown electric circuit? A π΄ πΆ π΅ B π΄ πΆ π΅ C π΄ πΆ π΅ D π΄ πΆ π΅ 20 Model 4 Physics Practice Test – G12 30. Which of the following figures shows the reverse biased connected diode? A B C D 21 Model 4 Physics Practice Test – G12 If the base of the common emitter transistor is connected to a positive large voltage as shown in the figure. Which of the following is correct? RC 31. C VCC RB B E VEC = Vout A The output voltage is high and the transistor acts as a switch ON. B The output voltage is high and the transistor acts as a switch OFF. C The output voltage is low and the transistor acts as a switch ON. D The output voltage is low and the transistor acts as a switch OFF. 22 Model 4 Physics Practice Test – G12 32. Which of the following figures has the highest resistance to the flow of electric current? A B C π π π π π D π 23 Model 4 Physics Practice Test – G12 Second, Objective questions (multiple choice) “each question is two marks” What will happen to the voltmeter reading and the value of the resistance taken from the rheostat at moving the slider of the rheostat from point 2 to point 1? VB 33. r V R 1 2 Rheostat The voltmeter reading The value of resistance taken from the rheostat A decreases decreases B decreases increases C increases decreases D increases increases 24 Model 4 Physics Practice Test – G12 In the shown electric circuit: If the current passing through the 10 Ω resistor is equal to 2 A, then the intensity of the current passing through the 2 Ω and 4 Ω resistors respectively are equal to……... and…….... 34. 2Ω The current intensity 4Ω 10 Ω through 4 β¦ The current intensity through 2 β¦ A 5A 10A B 10A 5A C 4A 8A D 8A 4A 25 Model 4 Physics Practice Test – G12 The figure shows a part of a closed circuit in which a southward electric current (I) passes through a copper wire (ab) that is placed between the two magnetic poles N and S. a 35. S N I b So, the direction of the magnetic force that acts on the copper wire is………. A Up to the page B down of the page C out of the page D Into the page .36 A solenoid of length 0.5 m, has 400 turns, and has a cross-sectional area of 0.001 π¦π . It carries an electric current of intensity 2A. Which of the following represents the magnitude of magnetic flux density at a midpoint on its axis? A 1x10-3 T B 2x10-3 T C 1T D 2T 26 Model 4 .37 Physics Practice Test – G12 A straight wire was wound in the form of a circular coil consisting of 4 turns and an electric current of intensity I passed through it, so the magnetic flux density at its center was ππ . if the same wire was wound again in the form of one circular coil and the same current intensity (I)passes through it, the magnetic flux density at its center became ππ , so the ratio of ππ ππ is ……... A π π B π π C ππ π D .38 π ππ The role of the cylinder split into two isolated halves in the operating of an electric motor is.............. A converting direct current to alternating current B converting alternating current to direct current C reversing the direction of the current every half cycle D producing Unidirectional electric current. 27 Model 4 .39 Physics Practice Test – G12 A solenoid coil with a coefficient of self-inductance (L) is divided into two identical coils. If the turns in each coil are spaced apart to keep the original length and the face area of the coil are constant, what is the coefficient of self-inductance for each coil? A 0.25 L B 0.5 L C 2L D 4L 28 Model 4 Physics Practice Test – G12 The figures show a part of the two types of the electric current measuring devices. 2I I I 2I 0 3I 4I 0 .40 Figure (A) Figure (B) Which of the following choices represents the reason for the two pointers settling at a certain reading on the scale? Figure B Figure A A The magnetic torque acting on the coil is equal to the mechanical torque (torsion) in the two spring coils B The magnetic torque acting on the coil is greater than the mechanical torque (torsion) in the two spring coils C The magnetic torque acting on the coil is equal to the mechanical torque (torsion) in the two spring coils D The magnetic torque acting on the coil is greater than the mechanical torque (torsion) in the two spring coils 29 The rate of heat gain is equal to the rate of heat loss The rate of heat gain is equal to the rate of heat loss The rate of heat gain is greater than the rate of heat loss The rate of heat gain is greater than the rate of heat loss Model 4 Physics Practice Test – G12 L1 = 50 H L2 = 100 H L3 .41 Ieff = 0.2 A 200 V , ππ π Hz Using the recorded data on the shown electric circuit, the value of (L3) is equal to ……………… A 0.2 H B 5H C 10.4 H D 14.3 H 30 Model 4 Physics Practice Test – G12 The graph represents a circuit consisting of an alternating current source, a resistor, and a capacitor connected in series, then: π πΉ ππ° .42 ππͺ π½ A π=π πΉ π B π=π πΉ π C π½πͺ = π π½πΉ D π½πͺ π½πΉ √π = √π π The electron microscope is characterized by a high resolving power. This is due to the .43 electrons having a ……………..kinetic energy and a …………………..associated wavelength. A high-short B high-long C low-short D low-long 31 Model 4 Physics Practice Test – G12 The figure represents several transitions of electrons in the hydrogen atom. Which of these transitions has the shortest wavelength? π=4 π .44 π=3 π π=2 π π π=1 A Transition W B Transition X C Transition Y D Transition Z 32 Model 4 Physics Practice Test – G12 Third, Essay questions (each question two marks) Two adjacent coils. The number of turns in the secondary coil is 500 turns. when an electric current of 10 A passes through the primary coil produces a magnetic flux of 4.2 x ππ−π Wb in the second coil, calculate 45 1 -The electromotive force induced in the secondary coil when the current in primary coil vanishes during 0.2 seconds. 2- The mutual induction coefficient between the two coils. An ohmmeter was made by connecting a 8 V battery in series with a resistor and a milli-ametter so that its pointer deviates to the maximum when a current equal to 4 46 mA passes through it. Find the value of the unknown resistance that should be connected to its terminals that makes the pointer deviates to the quarter of the current scale. 33
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