CLASS -10TH
SHEET
PRE ELECTRICITY
NAME : _____________________
CLASS : _____________________
BATCH TIMING : _____________________
EXERCISE SET - I
Q1. Mention a few methods of charging a body
Q2. How does a body get charged in the process of charging by friction?
Q3. A glass rod is rubbed with silk. State the charge acquired by glass and silk.
Q4. Name the kinds of charges present in nature
Q5. What is the smallest amount of charge available in nature?
Q6. Can charges exist in fractional quantities?
Q7. Name the constituents of an atom
Q8. Why do we say that charge acquired by a glass rod or an ebonite rod is static?
Q9. How do you use a pth ball electroscope to detect the presence of charges on a body?
Q10. Mention the different methods of charging a gold leaf electroscope?
Q11. What is the source of electricity and electrical phenomena?
Q12. What happens during charging by condition?
Q13. If a glass rod rubbed with silk cloth is brought in contact with a neutral metallic sphere, what type
charge will be gained by the sphere?
Q14. How do charges behave in the presence of other charges?
Q15. What are the charges acquired by an ebonite rod and fur when they are rubbed against each
other?
Q16. “Unchanged bodies contain no charged particles”. Is the statament true?Explain
Q17. Atom as a whole is electrically neutral. Why?
Q18. Can a body contain +10.25 e charge on it?
Q19. What is conservation of charge?
Q20. What are conductors? Give examples
Q21. What are insulators? Give exmaples
Q22. Explain why conductor have large number of free electrons
Q23. Salty water contains no free electrons but can conduct electricity. How?
Q24. Can free electrons move in and out of the body?
Q25. Can ions behave as charge carriers in metallic conductors?
Q26. What is an electroscope?
Q27. Name two different types of electroscopes.
Q28. What is the drawback of pith ball electroscopes?
Q29. Explain the setup of a gold leaf electroscope with a neat labeled diagram.
Q30. What is the difference between charging by conduction and charging by induction?
Q31. State the Coulomb’s Law. Write dwn its mathematical form.
Q32. True or False: The columbic force of attraction or repulsion between two charges is an action
reaction pair according to Nweton’s third law.
Q33. What is I coulomb?
Q34. What is a point charge? Can point chargeactually exist?
Q35. How can we define intensity of electric field?
Q36. What is the convention for direction of an elcetric field?
Q37. What are electric field lines?
Q38. How can we find the direction of electric field from electric field lines?
Q39. How do electric field lines give us idea about electric field intensity at different points?
Q40. Can electric field lines intersect each other? Why or why not?
Q41. Draw the electric field lines due to two equal and opposite point charges
Q42. Draw the electric field lines due to two equal and same point charges
Q43. True or False: The direction of force on a charge in electric is always along the direction of electric
field.
Q44. What is potential energy for a system of charges?
Q45. How can we define electric potential at any point?
Q46. What is potential difference?
Q47. What is 1 volt potential difference?
Q48. How are sparks produced?
Q49. How is lightning produced?
Q50. Why are lightning and thunder experienced at different time although they are produced
simultaneously ?
Q51. Explain how lightning conductors work
Q52. True or False: The acumulation of charges is directly proportional to the radius of durvature of a
curved surface
Q53. Explain the working of a photocopier and the importance of static electricity in its working.
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MULTIPLE CHOICE QUESTIONS
Q54. When a plastic comb runned on hair is brought near bits of paper, it attracts them because
(A) the comb and the paper get similarly charged
(B) they get oppositely charged
(C) the paper bits are very light
(D) none of these
Q55. Two uncharged bodies when rubbed against each other get charged. This is known as
(A) charging by conduction
(B) charging by friction
(C) charging by induction
(D) none of the above
Q56. When a glass rod is rubbed with silk, it is said to be positively charged. Which of the following
statements is true?
(A) Electrons move from silk to glass
(B) Electrons move from glass to silk
(C) Protons move from silk to glass
(D) Protons move from glass to silk
Q57. You have two bodies A and B. A is positively charged. If A and B are conductors and A touches B,
then
(A) B gets positively charged
(B) B gets negatively charged
(C) A and B will have equal amounts of charge
(D) A and B both have positive charge
Q58. The rod or stem of a gold leaf electroscope is made of
(A) wood (B) brass (C) glass (D) ebonite
Q59. If a charge is placed on a conductor having a pointed end, then
(A) the charges get accumulated at the points
(B) the charges get distributed around the conductor
(C) the charges collect inside the conductor
(D) none of the above
Q60. The process of making copies in a photocopier is known as
(A) photography (B) Xerography (C) videography (D) all of these
Q61. Which of the following is a photo conducting material?
(A) Copper (B) Poly vinyl chloride (C) Selenium (D) Aluminum
Q62. What is the atmospheric temperature at a height of 6 7 km?
(A) 20 o C (B) 0 o C (C) 10 o C (D) 20 o C
Q63. The potential difference between two points are called
(A) voltage (B) work (C) electric power (D) rating
Q64. If 8 field lines come out of + 1C charge how many field lines will end at -2C charge?
(A) 0 (B) 8 (C) 16 (D) 32
Q65. The relative permittivity of a medium is also known as
(A) Boltzmann constant (B) Planck’s constant (C) Stefan’s constant (D) Dielectric constant
Q66. Nylon is an example of
(A) insulator (B) conductor (C) semiconductor (D) none of these
EXERCISE SET - II
Q67. Lightning conductor is made of
(A) copper (B) glass (C) ebonite (D) fur
Q68. Where do charges reside in the case of a charged conductor?
(A) Inside the conductor
(B) On the outer surface of the conductor
(C) On the inner surface of the conductor
(D) Anywhere outside the conductor
Q69. Two point charges 3 C and -6 C are 3 m apart. Find the force between them. State the nature of
the force.
Q70. Two point charges q and 10 q repel each other with a force of 3.6 10 5 N when they are 0.02 m
apart. Find the charges.
Q71. Calculate the force between two electrons that are 0.1 nm apart.
Q72. Find the magnitude of force on a 10 C charge placed in an electric field of 1 106 N / C .
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Q73. Find the minimum electrostatic force that can exist between two charges separated by distance
1m.
Q74. Find the number of excess electrons in a body having charge of -5 C.
A charge of -20 C is placed in an electric field given by E 5 i 3 j 4 k N / C . Find the force
Q75.
on the charge.
Q76. Three charges is an isolated system have initial charges of +2 C, -3 C and +4 C. After some
interaction their final charges become -5 C , + 1C and X C respectively. Find X.
Q77. Find the work done by external force in bring two charges of +10 C each from infinity to a
separation of 2 meters.
Q78. What is the electric field at a distance of 5 meters from a point charge of +0.2 C?
Q79. What is the work done in moving a charge of -10e across a potential difference of 20 V from
higher potential to lower potential?
A positive point charge q of mass m is released from rest in a uniform electric field E directed
along the x-axis as in the figure.
Q80. What is the acceleration of the positive charge q? Is it in uniform acceleration?
Q81. What will be the final velocity of the charge after having a displacement?
Q82. What will be the kinetic energy of the charge after it has moved a distance x?
Q83. Match the following
A B
kQ
(1) Electric force (a) E
r2
(2) Natural behaviour of two charged bodies (b) Work done in moving unit power from one
point to another
(3) q = ne (c) 0 8.8542 10 12 C 2 / N m 2
(4) Law of conservation of charges (d) The force of interaction between charged
bodies
kq1q2
(5) Conductors (e) U
r
(6) Electroscope (f) The sphere of influence around a charge
(7) Coulomb’s law (g) F qE
(8) Premittivity of free space (h) Quantisation of charge
(9) Electric field (i) Like charges repel and unlike charges attract
each other
(10) Electric field intensity at a distance r from a
charge q (j) Materials which have free charge carriers
(11) Force on a point charge in an electric field (k) Charges can neither be created nor be
destroyed, but can be transferred from one
body to another
(12) Potential energy of a system of two charges
seperated by a distance r (l) Device used to test the presence and nature
of charge on a body
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(13) Potential difference between two points in
kq1q2
an electric field (m) F
r2
Q84. Which of the following is/are conductors?
(A) Copper (B) Aluminium (C) Glass (D) Wood
Q85. Which of the following is/are insulators?
(A) Iron (B) Steel (C) Plastic (D) Glass
Q86. Electrifcation of a body can be achieved by charging by
(A) Friction (B) COnduction (C) Induction (D) Rotation
Q87. Which of the following is/are applications of static electricity?
(A) Lightning conductor (B) Photocopier (C) Electromagnet (D) Microphone
Q88. Which of the following represent electric field lines?
(A) (B)
(C) (D)
CHALLENGING EXERCISE
Q89. Two equal charges repel each other with a force of 4 10 5 N when they are 0.3 m apart in air..
Find the magnitude of the charges. What will be the force if the distance between them is
doubled?
Q90. Force between two charges is 36 10 6 N when separated by a certain distance. On increasing
the separation by 5 m, the force reduces to 25 10 6 N . If one charge is ten times the other, find
the initial separation and magnitude of charges.
Q91. Two charges of 9 and 16 C are placed 0.7 m apart. Find the position of the null point ( A point
where the net is zero) on the line joining the two charge.
Q92. Two fixed charges of +2 C and -2C are kept at (1,0) and (0,-1) respectively. Find the electric
field at the point (1,-1)
OLYMPIAD AND NTSE LEVEL EXERCISE
Q93. An uncharged metal object M is insulated from its surroundings. A positively charged metal sphere
S is then brought near to M. Which diagram best illustrates the resultant distributions of charge on
S and M?
(A) (B)
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(C) (D)
Q94. A glass rod rubbed with silk is used to charge a gold leaf electroscope and the leaves are
observed to diverge. The electroscope thus charged is exposed to X-rays for a short period. Then
(A) the divergence of leaves will not be affected
(B) the leaves will diverge further
(C) the leaves will collapse
(D) the leaves will melt
Q95. Given are four arrangements of three fixed electric charges. In each arrangement, a point labelled
P is also identified - test charge; +q, is placed at point P. All of the charges are of the same
magnitude Q, but they can be either positive or negative as indicated. The charges and point
P all lie on a straight line. The distance between adjacent items, either between charges or
between a charge and point P, are all the same.
I. II.
III. IV.
Correct order of choices in a decreasing order of magnitude of force on P is
(A) II I III IV (B) I II III IV
(C) II I IV III (D) III IV I II
Q96. Points charges +4q, -q and +4q are kept on the x-axis at point x = 0, x = a and X = 2a respectively.
then
(A) Only q is in stable equilibrium
(B) None of the charges are in equilibrium
(C) All the charges are in unstable equilibrium
(D) All the charges are in stable equilibrium
Q97. An infinite number of charges, each of charge 1C , are placed on the x-axis with co-ordinates
x = 1, 2,4,8,.... . If a charge of 1C is kept at the origin, then what is the net force acting on 1 C
charge?
(A) 9000 N (B) 12000 N (C) 24000 N (D) 36000 N
Q98. Two identical point charges are placed at a separation of d. P is a point on the line joining the
charges, at a distance x from any one charge. The field at P is E, E is plotted against x for values
of x from close to zero to slightly less than d. Which of the following represents the resulting
curve?
(A) (B)
(C) (D)
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Q99. The figure shows some of the electric field lines corresponding to an electric field. The figure
suggests
(A) E A E B EC (B) E A E B EC
(C) E A EC E B (D) E A EC E B
Q100. A charged particle of mass m and charge q is released from rest in an electric field of constant
magnitude E. The kinetic energy of the particle after time t is
2 E 2t 2 E 2 q 2t 2 Eq 2 m Eqm
(A) (B) (C) (D)
mq 2m 2t 2 2t
Q101. Read the assertion and reason carefully to mark the correct option.
Assertion : A small metal ball is suspended in a uniform magnetic field with the help of an
insulated thread. When a high energy X rays beam falls on the ball. Then the ball with be defected
in the direction of electric field
Reason: The ball will oscillate in the field
(A) If both Assertion and Reason are true and the Reason is correct explanation of the Assertion
(B) If both Assertion and Reason are true but Reason is not the correct explanation of the
Assertion
(C) If Assertion is true, but the Reason is false
(D) If the both Assertion and Reason are false
Q102. Three charges, each +q, are placed at the corners of an isoceles triangle ABC of sides BC and
AC 2a D and E are the mid-points of BC and CA. The work done in taking a charge Q from
D to E is
eqQ qQ 3qQ
(A) (B) (C) zero (D)
8 0 a 4 0 a 4 0 a
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Address : Priyadarshini, Maripur (Opp. of Petrol Pump), Near
Jaintpur Public School,Muzaffarpur.
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