1.) A repelling force occurs between two charged objects when the charges are of
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Question
1.) A repelling force occurs between two charged objects when the charges are of a.unlike signs b.ike signs c.equal magnitude d.unequal magnitude
2.) When a glass rod is rubbed with silk and becomes positively charged a.electrons are removed from the rod b.protons are removed from the silk c.protons are added to the silk d.the silk remains neutral
3.) Charge is most easily transferred in a. nonconductors b. conductors c. semiconductors d. insulators
4.) In the diagram below, the circles represent small balls that have electric charges. Ball number 1 has a negative charge, and ball 2 is repelled by ball 1. Next, you see that ball 2 repels ball 3 and that ball 3 attracts ball 4. What is the electric charge on ball 4? a.ball 4 may have either a negative or positive charge b.ball 4 has a negative charge c. ball 4 has a positive charge d.it is not possible to determine the charge on ball 4.
5.) Which sentence best describes electrical conductors? a.electrical conductors have low mass density b. electric conductors have high tensile strength c.electrical conductors have electric charges that move freely d. electric conductors are poor heat conductors
6.) Which statement is most correct regarding electric insulators? a.charges within electric insulators do not readily move b.electric insulators have high tensile strength c.electric charges move freely in electric insulators d.electric insulators are good heat conductors
7.) The process of charging a conductor by bringing it near another charged object and then grounding the conductor is called? a.contact charging b.induction c.polarization d.neutralization
8.) The figure below demonstrates charging by a.grounding b.induction c.polarization d.contact
9.) Conductors can be charged by ___, while insulators cannot. a.grounding b.induction c.polarization d.contact
10.) Which of the following is not true for both gravitational and electric forces? a.The inverse square distance law applies b.Forces are proportional to physical properties c.Potential energy is a function of distance of separation d.Forces are either attractive or repulsive
11.) Two point charges, initially 1 cm apart, are moved to a distance of 3 cm apart. By what factor do the resulting electric and gravitational forces between them change? a.9 b.3 c.1/3 d.1/9
12.) Two positive charges, each of magnitude q, are on the y-axis at points y=+a and y=-a. Where would a third positive charge of the same magnitude be located for the net force on the third charge to be zero? a.at the origin b.at y=2a c. at y=-2a d.at y=-a
13.) Which is the most correct statement regarding the drawing of electric field lines? a.electric field lines always connect from one charge to another b.electric field lines always form closed loops c.electric field lines can start on a charge of either polarity d.electric field lines never cross each other
14.) Which of the following is not a characteristic of electrical potential energy? a.it is a form of mechanical energy b.it results from a single charge c.it results from the interaction between charges d.it is associated with a charge in an electric field
15.) A battery converts what type of energy into electric energy? a.mechanical b.nuclear c.solar d.chemical
16.) When a parallel-plate capacitor is connected to a battery:a____ is stored on one plate and a_____ is stored on the other. a.negative charge, positive charge b.potential energy, kinetic energy c.potential difference, internal resistance d.residual charge, induced charge.
17.) What effect will be produced on a capacitor if the separation between plates is increased? a. it will increase the charge b. it will decrease the charge c. it will increase the capacitance d. it will decrease the capacitance
18.) A 0.25 (mu)F capacitor is connected to a 9.0 V battery. What is the charge on the capacitor? a.1.2*10^-12C b. 2.2*10^-6C c. 2.5*10^-6C d. 2.8*10^-6C
19.) How is current affected if the number of charge carriers decreases? a,the current increases b.the current decreases c.the current initially decreases and then is gradualy restored d.the current is not affected
20.) How is current affected if the time interval over which the charge passes through a given area decreases while the amount of charge remains the same? a. the current increases b.the current decreases c.the current initially increases and then gradually is restored d.the current is not affected
21.) The current in an electron beam in a cathode-ray tube is 7.0 10^-5 A. How much charge hits the screen in 5.0 s? a.2.8 10^3 C b.5.6 10^-2 C c.3.5 10^-4 C d.5.3 10^-6 C
22.) When electrons move through a metal conductor a.they move in a straight line through the conductor b.they move in zig zag patterns because of repeated collisions with the vibrating metal atoms c.the temperature of the conductor decreases d.they move at the speed of light in a vacuum
23.) What is the potential difference across a 5.0(omega) resistor that carries a current of 5.0 A? a.1.0 10^2 V b.25 V c.10.0 V d.1.0 V
24.) Which of the following does not affect a materials resistance? a.the length of the material b.the type of material c.the temperature of the material d.ohm's law
25.) Which of the following wires would have the greatest resistance? a.an aluminum wire 10 cm in length and 3 cm in diameter b. an aluminum wire 5 cm in length and 3 cm in diameter c. an aluminum wire 10 cm in length and 5 cm in diameter d. an aluminum wire 5 cm in length and 5 cm in diameter
26.) Which of the following will allow you to calculate the kilowatt- hr usage? a.the voltage and current in the circuit b.the resistance, the current, and the time the curcuit operates c.the voltage and the resistance of the circuit d. the current and the time the circuit operates
27.)Which of the following is the best description of a schematic diagram? a.uses pictures to represent the parts of a circuit b.determines the location of the parts of a curcuit c.shows the parts of a circuit and how the parts connect to each other d.shows some of the parts that make up a circuit
28.) A circuit has a continuous path through which charge can flow from a voltage source to a device that uses electrical energy. What is the name of this type of circuit? a.a short circuit b.a closed circuit c. an open circuit d. a circuit schematic
29.) If the potential difference across the bulb in a camping lantern is 9.0 V, what is the potential difference across the battery used to power it? a.1.0 V b.3.0 V c.9.0 V d.18 V
30.) If the batteries in a portable CD player provide a terminal voltage of 12 V, what is the potential difference across the entire CD player? a.3.0 V b.4.0 V c.6.0 V d.12 V
31.) Three resistors with values of 4.0(omega) , 6.0(omega), and 8.0(omega), respectively, are connected in series. What is their equivalent resistance? a.18 omega b.8.0 omega c.6.0 omega d.1.8 omega
32.) Three resistors connected in a series have potential differences across them labeled deltaV1, delta V2, and delta V3. Which of the following expresses the potential difference taken over the three resistors together? a. deltaVt=deltaV1+deltaV2+deltaV3 b. deltaVt=(1/deltaV1+1/deltaV2+1/deltaV3) c. deltaVt= deltaV1=deltaV2=deltaV3 d. deltaVt=(1/deltaV1+1/deltaV2+1/deltaV3)^-1
33.) Three resistors with values R1, R2, and R3 are connected in a series. Which of the following expresses the total resistance, Req, of the three resistors? a.Req=R1+R2+R3 b.Req=(1/R1+1/R2+1/R3) c.Req=R1=R2=R3 d.Req=(1/R1+1/R2+1/R3)^-1
34.) What is the main difference between resistors wired in series as compared to resistors wire in parallel? a.resistors wired in series create an equivalent resistance smaller than the equivalent resistance of the same resistors wired in parallel b.resistors wired in series create an equivalent resistance larger than the equivalent resistance of the same resistors wired in parallel c.resistors wired in series create an equivalent resistance smaller than each individual resistor in the circuit d.Resistors wired in parallel create an equivalent resistance larger than each resistor in the circuit.
35.)Three resistors connected in parallel carry currents labeled I1, I2, and I3. Which of the following expresses the total current It in the combined system? a.It=I1+I2+I3 b.It=(1/I1+1/I2+1/I3) c. It=I1=I2=I3 d. It=(1/I1+1/I2+1/I3)^-1
36.) Three resistors connected in parallel have potential differences across them labeled deltaV1, deltaV2 and deltaV3. Which of the following expresses the potential difference across all three resistors? a.deltaVt=deltaV1+deltaV2+deltaV3 b.deltaVt=(1/deltaV1+1/deltaV2+1/deltaV3) c. deltaVt=deltaV1=deltaV2=deltaV3 d. deltaVt=(1/deltaV1+1/deltaV2+1/deltaV3)^-1
37.) three resistors with values of R1, R2, and R3 are connected in parallel. Which of the following expresses the total resistance, Req, of the three resistors? a.Req=R1+R2+R3 b. Req=(1/R1+1/R2+1/R3) c.Req=R1=R2=R3 d.Req=(1/R1+1/R2+1/R3)^-1
38.)To find the current in a complex circuit, it is necessary to know the a.potential difference in each device in the circuit b.current in each device in the circuit c.equivalent resistance of the circuit d.number of branches in the circuit
39.) In any complex resistance circuit, the voltage acrossany resistor in the circuit is always, a.less than the voltage source b.equal to or less than the voltage source c.equal to the voltage source d.greater than the voltage source.
40.) What is the equivalent resistance of the resistors in the figure shown below? a.7.5 omega b.10 omega c.16 omega d.18 omega
Explanation / Answer
a
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