Department of Education
Region X
Gingoog City Division
Gingoog City Comprehensive National High School
Senior High School
First Quarter Exam
Physics 2
Multiple Choice. Directions: Read each sentence carefully then select from the four choices the one that
answers the best of the questions or complete the statement and write the letter of your answer.
A wire 1.0 m long is perpendicular to a magnetic field of 0.1 T What is the force on the wire when it
carries a current of 10 A? (F= I ΔL B sinθ)
Suppose the magnetic field strength created inside a magnet is 0.07 T and a 4.3 mC charge is moving
through the field at right angle to the field lines. How strong is the magnetic force on the charge?
In a certain electric motor, wires that carry a current of 6 A are perpendicular to a magnetic field of 0.5 T.
The force per centimeter on these wires is (F = I ΔL B sinθ)
What should the current be in a wire loop 10 mm in diameter if the magnetic field magnitude at the
center of the loop is to be 0.0010 T? (B = µI / 2r)
A long solenoid is wound with 30 turns/cm. What is the magnetic field magnitude inside the solenoid
when the current is 3.8 A? ( B = µ I N/L, µ = 1.257 x 10-6 Tm/A)
Find the magnetic field in air 10 mm from a wire that carries a current of 1.0 A
A wire is 1.0 m long is perpendicular to a magnetic field of 0.1 T . A) What is the force on the wire
when it carries a current of 10 A?
What is the force in no. 49 if the wire is parallel to the magnetic field?
Which diagram below shows charging by rubbing?
a.
b.
c.
d.
Which one of the following statements is TRUE?
a. Atomic nuclei contain only protons and electrons.
b. The electron and neutron have the same mass.
c. The electron and proton have the same mass.
d. The electron and proton have charges of the same magnitude but of opposite sign.
An object has a positive electric charge whenever
a. It has an excess of electrons
c. It has a deficiency of electrons
b. the nuclei of its atoms are positively charged d. the electrons of its atoms are positively charged
Which equation is the correct mathematical expression of the law “The force between two charges is
proportional to the product of the charges and is inversely proportional to the square of the distance
between them.”
a.
b.
c.
d.
What is the title of the law stated in no.4?
Two charges of +Q are 1 cm apart. If one of the charges is replaced by a charge of –Q, the magnitude
of the force between them is
Two equal charges attract each other with a force of 1.0 x 10-5 N. When they are moved 4mm farther
apart, the force between them becomes 2.5 x 10-6 N . The original separation of the charges was
The magnitude of the charges in no. 7 is
Electric field lines
a. Have the same pattern around a charged metal sphere as they do around a point charge
b. Leave negative charges and enter positive ones
c. Are close together when E is weak and far apart where E is strong
d. Physically exist
The electric field 20 mm from a certain charge has a magnitude of 1.0 x 105 N/C. The magnitude of E
10 mm from the charge is
A closed surface encloses a net charge of 2.5x10-6 C. What is the net electric flux through the surface?
An electric field of magnitude 200 V/m can be produced by applying a potential difference of 10 V to a
pair of parallel metal plates separated by
The following equations relate electric potential with work, potential energy and electric field EXCEPT
An electron gun has parallel plates separated by 4 cm and gives electrons 25 kV. What is the electric
field strength between the plates?
If you wanted to design a capacitor system to store the greatest energy, what would you use?
a. minimum surface area and maximum separation of the parallel plates
b. maximum surface area and maximum separation of the parallel plates
c. maximum surface area and minimum separation of the parallel plates
d. minimum surface area and minimum separation of the parallel plates
Two 50 µF capacitors are connected in series. What is the equivalent capacitance of the combination?
Three capacitors of 2 farads each are connected in parallel. The equivalent capacitance is
Two capacitors, one of 10 µF and the other 20 µF, are connected in series across a 12 V battery. What is
the total charge in the circuit?
Two capacitors, one of 10 µF and the other 20 µF, are connected in series across a 12 V battery. Find the
potential difference across each capacitor.
If a 20 µF capacitor is to have an energy content of 2.5 J, it must be placed across a potential difference of
In charging a storage battery, a total of 2.0 x 105 C is transferred from one set of electrodes to another.
The potential difference between the electrodes is 12 V. The energy stored in the battery is
The capacitance of a parallel-plate capacitor is increased from 8.0 µF to 50.0 µF when sheet of glass is
inserted between its plates. What is the dielectric constant of the glass?
A parallel plate capacitor is connected to a fixed voltage. If a dielectric material is introduced between
the plates, which of the following will result?
a. charge and capacitance increase
c. Charge and capacitance decrease
b. Charge decreases and capacitance increases
d. charge increases and capacitance decreases
Which statement correctly describes conventional current?
a. movement of negative charges from negative end to positive end of battery
b. movement of negative charges from positive end to negative end of battery
c. movement of positive charges from negative end to positive end of battery
d. movement of positive charges from positive end to negative end of battery
A current of 5 A flows through a resistor for 30 minutes. How many charges flow through the resistor
during the time given?
What happens to the resistance of a copper wire if its temperature is increased?
a. Decreases
b. remains the same
c. increases
d. can’t be determined
The resistance of a conductor does not depend on its
a. cross-sectional area
b. length
c. Mass
d. resistivity
Which of the following combinations of length and cross-sectional area will give a certain volume of
copper the least resistance?
As the diameter of a copper wire is decreased, its resistance
A. Remains constant
b. decreases
c. increases
d. varies with time
Which one below distinguishes emf from potential difference?
a. It is a quantity expressed in volts (V).
b. It is the electrical energy given to 1 C of charge flowing through the dry cell
c. It is represented by the voltmeter reading in a closed circuit.
d. It is the electrical energy that is transformed to other form when 1 C of charge passes
through a component in a closed circuit.
An electric heater draws a current of 20 A when connected to a 120-V power source. Its resistance is
A student has a battery and an assortment of resistors. How should he arrange the resistors in a circuit to
obtain the maximum current flow when using all of the resistors?
a. in a parallel
b. in a series
c. in a series and parallel
d. all of these
How should ammeter and voltmeter be connected in a circuit?
a. Connect both across the circuit
c. connect ammeter across the circuit and voltmeter along the circuit
b. Connect both along the circuit
d. connect ammeter along the circuit and voltmeter across
The total resistance in a parallel circuit is always
a. Lesser than individual resistances
b. Greater than individual resistances
c. equal to the individual resistances
d. cannot be determined
What is the equivalent resistance of a 10-Ω resistor and a 30-Ω resistor connected in parallel?
A 12-V potential difference is applied across a series combination of four 6-Ω resistors. What is the
current in each resistor?
For numbers refer to the figure at the right.
Applying the Kirchhoff’s current law at junction a, what is the magnitude of current I?
Applying Kirchhoff’s Voltage Law at outer loop 1, What is the value of resistance r?
Applying KVL at loop 2, what is the value of the unknown emf (Ɛ)?
Which quantity distinguishes magnetic interaction from electric interaction?
a. Field
b. charge
c. velocity
d. Force
The magnetic field shown in the figure at the right is produced by
a. A north pole and a south pole
c. two south poles
b. Two north poles
d. a south pole and unmagnetized iron bar
Which figure below correctly demonstrate the magnetic field between two bar magnets?
A.
B.
c.
d.
God Bless!
43. A bar magnet is passed through a coil of wire. The induced current is greatest when
A. The magnet moves slowly, so that it is inside the coil for a long time
B. The magnet moves fast, so that it is inside the coil for a short time
C. The north pole of the magnet enters the coil first
D. The south pole of the magnet enters the coil first
44. A square wire loop 5 cm on a side is perpendicular to a magnetic field of 0.08 T. If the field drops to 0
in 0.2 s,
what is the average emf induced in the loop during that time? (Ɛ = BA cosθ /Δt)
A. 0.04 mV
b. 0.5 mV
c. 1 mV
d. 8 V
For nos. 45- 47 , refer to the circuit diagram at the right.
45
48.
49. What component in a circuit serves as a safety device by melting when a current that is too high
flows during a short circuit or power upsurge preventing fire.
a. Fuse
b. switch
c. wire
d. resistor
50. The following are the factors that affect the severity of electric shock in a human body EXCEPT
a. Path of current
b. magnitude of current
c. duration of current passing the body
d. condition of the body
“God bless”
A rod with an unknown charge attracts a plastic ball. Which one or more of the following might describe
them?
A. The rod is positive and the ball is negative.
c. The rod is positive and the ball is
uncharged.
B. The rod is negative and the ball is positive
d. The rod is positive and the ball is
uncharged.
A capacitor acquires a charge of 0.002 C when connected across a 50-V battery. Its capacitance is
A. 1 µF
b. 2 µF
c. 4 µF
d. 40 µF
15. What voltage is necessary to produce a 300 µC charge on a 4 µF capacitor?
A. 0.013 V
b. 4 V
c. 75 V
d. 300 V
What is the capacitance of a parallel plate capacitor with metal plates, each of area 1.0 m2, separated
by 1.0 mm?
a. 7.85 nF
b. 7.85 pF
c. 8.85 nF
d. 8.85
pF
20. What charge is stored in the capacitor in no. 19 if a voltage of 3.0x103 V is applied to it?
A. 2.6x10-5 C
b. 2.7x10-5 C
c. 2.6x10-6 C
d. 2.7x10-6 C
. In a series circuit, when one bulb gets busted the other bulbs will
A. Not light
b. not be affected
c. also get busted
d. it depends on the circuit
Three resistors whose resistances are 5.0, 10.0 and 15.0 Ω are connected in series across 12.0-V battery.
What is the total resistance in the circuit? A. 0.37 Ω
b. 2.73 Ω
c. 6 Ω
d. 30 Ω
34. What is the current on each resistor in no. 33?
a. 0.4 A
b. 2.5 A
c. 30 A
d. 450 A
35. What is the potential difference across the 5 Ω resistor in no. 33? A. 2 V b. 4 V c. 6 V d. 12 V
36. What is the potential difference across the 10 Ω resistor in no. 33? A. 2 V b. 4 V c. 6 V d. 12 V
37. What is the potential difference across the 15 Ω resistor in no. 33? A. 2 V b. 4 V c. 6 V d. 12 V