1. When a charge may result on the uncharged body without touching it, a(n) ____
ID: 1415630 • Letter: 1
Question
1. When a charge may result on the uncharged body without touching it, a(n) ____________ charge my result on the uncharged body. When a charged body is brought into contact with an uncharged body and then is removed, a(n)
2. _______________ charge may result on the uncharged body. a. negatively; positively b. positively; negatively c. induced; residual d. residual; induced
3. Electric charge is a. found only in a conductor b. conserved c. found only in a insulator d. not conserved.
4. If a positively charged glass rod is used to charge a metal bar by induction, a. the charged on the bar will be equal in magnitude to the charge on the glass rod. b. the charge on the bar must be negative. c. the charge on the bar must be positive d. the charge on the bar will be greater in magnitude than the charge on the glass rod.
5. Electric charge a. occur only in separate parcels, each of ±1.6 x 10-19 C b. is a continuous quantity that can be subdivided indefinitely c. is a continuous quantity but it cannot be subdivided into smaller parcels than ±1.6 x 10-19 C d. occurs only in separate parcels, each of ±1 C
6. The magnitude of electric force is directly proportional to _________________ and inversely square proportional to 7) ____________________. a. charges and distance b. force and time c. distance and charge d. Charge and time
7. The electron volt is a unit of a. potential difference b. energy c. charge d. momentum
8. The resistance of a conductor does not depend on its a. resistivity b. length c. cross-sectional area d. mass
9. The 8.0- coil of a loudspeaker carries a current of 0.80 A. The potential difference across its terminals is a. 0.1 V b. 5.1 V c. 6.4 V d. 10 V
10. The resistance of a conductor can be determined if ___________ are known. a. potential difference and current b. voltage and potential difference c. energy and current d. current and amperes
11. If three resistors are connected in parallel, there are __________ current paths in the circuit. a. four b. three c. two d. one
12. The equivalent resistance of a parallel circuit is always ________ the resistance of any resistor in the circuit. a. less than b. nearly equal to c. equal to d. greater than
13. A magnetic field CANNOT: a. exert a force on a charged particle b. change the velocity of a charged particle c. change the momentum of a charged particle d. change the kinetic energy of a charged particle
14. The following are the source of magnetic field except for a. magnets b. wire carrying current c. charge d. moving charge
15. The strength of magnetic field is greatest ___________. a. near the North pole b. near the south pole c. at the middle of magnet d. both a and b
16. The magnetic field lines due to an ordinary bar magnet: a. form closed curves b. cross one another near the poles c. are more numerous near the N pole than near the S pole d. do not exist inside the magnet
17. The magnitude of the magnetic force on a current-carrying wire depends on ____. a. the strength of the magnetic field b. the length of wire in the magnetic field c. the current in the wire d. all of these answers
18. Which of the statements is CORRECT? a. a magnet has the greatest strength at the poles (little or no strength in middle) b. ends are called poles (free ends) c. Force of attraction or repulsion depends on strength of magnets and distance between poles d. all statements are correct
19. The following can change the strength of electromagnet except for a. by hammering b. increasing voltage c. applying heat d. none of them
Matching type Select your answer on Column A in Column B.
Columm A Columm B
20. Unit of resistance a. N g. Watt g. WATT
21. Unit of voltage b. Ohm h. J/C h.J/C
22. Unit of magnetic force c. Nm/C i. Tesla
23. Unit of current d. C/s
24. other term for voltage e. Weber
25.Unit of magnetic flux f. Potential difference
Explanation / Answer
Q1. residual charge is formed on uncharged body without touching it.
charge it induced when another charged body comes into contact with an uncharged body.
so option d is correct.
Q3.Electric charge is conserved.
hence option b is correct.
Q4. If a positively charged glass rod is used to charge a metal bar by induction,the charge on the bar must be negative
option b is correct.
Q5. Electric charge occur only in separate parcels, each of ±1.6 x 10-19 C
option a is correct.
Q6.The magnitude of electric force is directly proportional to charges and inversely square proportional to distance.
option a correct.
Q7.The electron volt is a unit of energy.
otpion b is correct.
Q8.The resistance of a conductor does not depend on its mass as resistance=resistivity*length/area.
option d is correct.
Q9.The 8.0- coil of a loudspeaker carries a current of 0.80 A. The potential difference across its terminals =current*resistance=6.4 volts
option c is correct.
Q10.The resistance of a conductor can be determined if potential difference and current are known. as resistance=potential difference/current
option a is correct.
Q11.if three resistors are connected in parallel, there are three current paths in the circuit.
hence option b is correct.
Q12.The equivalent resistance of a parallel circuit is always less the resistance of any resistor in the circuit
option a is correct.
Q13. A magnetic field CANNOT: change the kinetic energy of a charged particle.
as magnetic force acts always perpendiocular to the direction of motion, work done=0
hence it can not change the kinetic energy.
option d is correct.
Q14. The following are the source of magnetic field except for charge.
option c is correct.
Q15.The strength of magnetic field is greatest both near north pole and south pole.
option d is corrrect.
Q16.The magnetic field lines due to an ordinary bar magnet form closed curves from north pole to south pole on the outisde and south pole to north pole in the inside.
option a is correct.
17.The magnitude of the magnetic force on a current-carrying wire depends on all of these.
force=i*(cross product of L and B)
where i=current
L=length
B=magnetic field strength
hence option d is correct.
Q18.option d is correct.
Q19.option c is correct.
Q20.unit of resistance : ohms (option b)
Q21. unit of voltage : J/C (option h)
Q22. unit of magnetic force : N(option a)
Q23. unit of current : C/s (option d)
Q24. other term for voltage : potential difference (option f)
Q25. unit of magnetic flux : weber (option e)
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