Class 12 Physics Chapter 1 Electric Charges and Fields MCQ PDF

ZIET BHUBANESHWAR Chapter–1: Electric Charges and Fields MULTIPLE CHOICE QUESTIONS S. QUESTIONS NO. 1 The electric flux through a closed gaussian surface depe...

ZIET BHUBANESHWAR Chapter–1: Electric Charges and Fields MULTIPLE CHOICE QUESTIONS S. QUESTIONS NO. 1 The electric flux through a closed gaussian surface depends upon (A) Permittivity of the medium (B) Net charge enclosed only (C) Net charge enclosed and permittivity of the medium (D) Net charge enclosed, shape and size of the Gaussian surface and permittivity of the medium 2 What is the angle between the electric dipole moment and electric field strength due to it on the axial line? (A) 00 (B) 900 (C) 1800 (D) None of these 3 Which of the following statements is not true about Gauss’s law? (A) Gauss’s law is true for any closed surface. (B) The term q on the right side of Gauss’s law includes the sum of all charges enclosed by the surface. (C) Gauss’s law is not much useful in calculating electrostatic field when the system has some symmetry. (D) Gauss’s law is based on the inverse square dependence on distance contained in the coulomb’s law. 4 Which of the following is not a property of electric field lines? (A) Field lines are closed and continuous curves without any breaks. (B) Two field lines cannot cross each other. (C) Field lines start at positive charges and end at negative charges. (D) They do not form closed loops. 5 Select the correct statements from the following (i) inside a charged or neutral conductor, electrostatic field is zero (ii) the electrostatic field at the surface of the charged conductor must be tangential to the surface at any point (iii) there is no net charge at any point inside the conductor (A) (i) and (ii) (B) i) and (iii) (C) (ii) and (iii) (D) (i), (ii), and (iii) ZIET BBSR 8/10/2021 Page 1 6 The charges on two spheres are +7mC and –5mC respectively. They experience a force F. If each of them is given an additional charge of –2mC, the new force of attraction will be (A) F (B) F/2 (C) F/ (D) 2F 7 When 2 × 1011 electrons are removed from a neutral metal sphere, the charge on the sphere becomes: (A) -16 nC (B) 16 nC (C) -32 nC (D) 32nC 8 Three charges each equal to 2 µC are placed at the corners of an equilateral triangle. If force between any two charges is 2F, then the net force on either will be: (A) (B) (C) (D) 9 Electric flux emanating through a surface element placed in an electric field is (A) 10 units (B) 20 units (C) 4 units (D) 16 units 10 A charge q is placed at one corner of the cube. The electric flux passing through any one of its face is (A) (B) (C) (D) 11 Cathode rays travelling from west to east enter into region of electric field directed towards south to north in the plane of paper. The deflection of cathode rays is towards: (A) East (B) West (C) North (D) South ZIET BBSR 8/10/2021 Page 2 12 In the figure the net electric flux through the area is  when the system is in air. On immersing the system in water, the net electric flux through the area: (A) becomes zero (B) remains same (C) increases (D) decreases 13 Two-point charges 2µC and 4µC are placed 2 cm apart. The ratio of the Coulomb’s force experienced by them is (A) (B) (C) (D) 14 The given figure shows tracks of three charged particles in a uniform electrostatic field. Which of them is probably an α-particle? (A) 1 (B) 2 (C) 3 (D) None of the above 15 A tiny spherical oil drop carrying a net carge q is balanced in stil air with a vertical uniform electric field strength Vm—1. When the field is switched off, the drop is observed to fall with terminal velocity ms--1. given 9.8 ms--2, viscocity of the air 1.8 N s m—2 and the density of oil 900kgm—1, the magnitude of q is (A) (B) (C) (D) 16 The dimensional representation of ε0 will be A. [MLT2A2] B. [M-1 L -3 T 4A2] C. [ML-2T 2A-2] D. none of these 17 A parrot comes and sits on a bare high-power line. It will A. experience a mild shock B. experiences a strong shock C. get killed instantaneously D. not be affected at all ZIET BBSR 8/10/2021 Page 3 18 The force between two charges, when placed in free space, is 5N. if they are in a medium of relative permittivity 5, the force between them will be A. 1N B. 25N C.2.5N D. 1/5N 19 106 electrons are taken out of a pith ball. The positive charges on the pith ball is A. 1.6x10-13 C B. 1.6x10-19 C C. 1.6x10-25 C D. none of these 20 When a person standing barefoot on the ground comes in contact with a high-power line, he is likely to A. experience a total shock B. experience a mild shock C. experience a moderate shock D. remain unaffected 21 Two charges od 2 C and 5 are placed 2.5 cm apart. The ratio of the Coulomb’s force experienced by them is A. 1:1 B. 2:5 C. D. 4:25 22 Two balls carrying charges - and +8 attract each other with a force F. If a charge of -3 is added to both the balls, then the force between then will become A. 2F B. F/2 C. F D. zero 23 A hollow copper sphere is positively charged. The electric field at its center will be A. same as that on the surface B. more than that on the surface C. less than that on the surface nut not zero D. zero 24 what is the angle between an electric dipole moment and then electric field strength due to it on its equatorial line? A. 0o B. 90 o C. 180 o D. none of these 25 the magnitude of a charge q at the center of two equal and like charges Q so that the three charges are in equilibrium A. Q B. Q/2 C. Q/4 D. –Q/4 26 A glass rod acquires charge by rubbing it with silk cloth. The charge on glass rod is due to : (A) Friction (B) Conduction (C) Induction (D) Radiation ZIET BBSR 8/10/2021 Page 4 27 – (A) Conservation of charge (B) Conservation of mass (C) Conservation of energy (D) Quantization of charge 28 In the process of charging, the mass of the negatively charged body- (A) Increases (B) Decreases (C) Remains Constant (D) None of the above 29 When a soap bubble is given an electric charge (A)It contracts (B) It expands (C) Its size remains the same (D)It expands or contracts depending upon whether the charge is positive or negative 30 The distance between two-point charges is increased by 10%. The force of interaction approximately (A) Increased by 10% (B) Decrease by 10% (C) Decrease by 17% (D) Decrease by 21% 31 If a charge q is placed at the center of the line joining two equal charges Q such that the system is in equilibrium, then the value of q is (A)Q/2 (B)-Q/2 (C)Q/4 (D)-Q/4 32 Let ε0 denote the dimensional formula of the permittivity of vacuum. If M=mass, L=length, T=time and I=electric current, then (A) [M -1L -3T 2I] (B) [M -1L -3T 4I2] (C) [M -1L 2T -1I-2] (D) [M -1L2T-1I] 33 A negatively charged oil drop is prevented from falling under gravity by applying a vertical electric field 100 V/m. If the mass of the drop is 1.6 x 10-3g, the number of electrons carried by the drop is (g=10m/s2) (A) 1018 (B)1015 (C)1012 (D)109 34 Charge in motion within the Gaussian surface gives changing physical quantity (A)Electric field (B)Electric flux (C)Charge (D) Gaussian surface area 35 There is a point charge q located at the center of a cube. What is the electric flux of this point charge, through a face of the cube? (A)q/ε0 (B) q/6ε0 (C) q/3ε0 (D)It will depend upon the size of the cube ZIET BBSR 8/10/2021 Page 5 36 A charge Q is enclosed by a Gaussian spherical surface of radius R. If the radius is doubled, then the outward electric flux will (A)Increase four times (B) be reduced to half (C)remain the same (D)Be doubled 37 Law stating that, force is directly proportional to product of charges and inversely proportional to square of separation between them, is (A)Newton’s law (B)Coulomb’s law (C) Gauss’s law (D)Ohm’s law 38 When a body charges by conduction, its mass (A) Remains same (B) Increases (C)Decreases (D)Increase or decrease 39 Electric charge between two bodies can be produced by (A)Sticking (B)Rubbing (C) Oiling (D) Passing AC current 40 The insulation property of air, breaks down at E=3x 106V/m. The maximum charge that can be given to a sphere of radius 2.5 m is approximately (A) 2x 10-2C (B) 2x 10-3C (C) 3x 10-6C (D) 3x 10-5C 41 A-point charge +q is placed at a distance 5 cm directly above the centre of a square of side 10 cm, as shown in Fig. What is the magnitude of the electric flux through the square? (a) q / є0 (b) 6q / є0 (c) q /6 є0 (d) 2q / є0 42 A plane surface is rotated in a uniform electric field. When is the flux of the electric field through the surface maximum? a. When the surface is perpendicular to the field b. When the surface is parallel to the field c. When the surface is at an angle of 450 with the field d. When the surface is at an angle of 600 with the field 43 Two unlike charges separated by a distance of 1m attract each other with a force of 0.108N. If the charges are in the ratio 1:3, the weak charge is a) 2µC b) 4µC c) 6µC d) 5µC ZIET BBSR 8/10/2021 Page 6 44 Three charges + 3q + q and Q are placed on a st. line with equal separation. In order to keep the charge q at equilibrium, the value of Q will be : (a) +3q (b) +2q (c) -3q (d) -4q 45 If an electric dipole is kept in a uniform electric field then resultant electric force on it is: (a) always zero (b) never zero (c) depend upon capacity of dipole (d) None 46 The number of electron-taken out from a body to produce 1 micro coulomb of charge will be : (a) 6.25 × 1013 (b) 625 × 1018 (c) 6.023 × 1023 (d) None 47 If sphere of bad conductor is given charge then it is distributed on: (a) surface (b) inside the surface (c) only inside the surface (d) None 48 The dielectric constant of a metal is: (a) 0 (b) 1 (c) ∞ (d) -1 49 Each of the two-point charges are doubled and their distance is halved. Force of interaction becomes p times, w here p is: (a) 1 (b) 4 (c) 1/16 (d) 16 50 When placed in a uniform field, a dipole experiences: (a) a net force (b) a torque (c) both a net force and torque (d) neither a net force nor a torque 51 An electron is sent in an electric field of magnitude 9.1 × 106NC-1. The acceleration produced in it is: (a) 1.6 ms-2 (b) 1.6 × 1018ms-2 (c) 3.2 × 1018ms-2 (d) 0.8 × 1018 ms-2 52 Two-point charges +8q and -2q are located at, v = O and, v = L respectively. The location of a point on the. v- axis at which the net electric field due to these two-point charges b is zero (a) 4L (b) 8L (c) L/4 (d) 2L ZIET BBSR 8/10/2021 Page 7 53 The graph drawn between V are r for a non-conducting charged solid sphere of radius R for r < R will be: (a) straight line (b) parabola (c) hyperbola (d) None of these 54 Two parallel large thin metal sheets have equal surface charge densities of of opposite signs. The electric field between the plates is (a) 2 N/C (b) 0.5 N/C (c) 5 N/C (d) 10 N/C 55 Which of the following statement is correct? (A) A body can have a charge of (B) Signifies that the two charges are equal and opposite. (C) When a body acquires positive charge, its mass increases. (D) Charges cannot reside on the surface of a conductor. 56 Two-point charges of and repel with a force of 12 N. If each is given an additional charge of , the new force between them will be: (a) + 4 N (b) (c) 0 (d) 3 N 57 The S I unit of the surface integral of electric field is: (a) (b) (c) (d) N/C 58 Which of the following is not a characteristic of Electrostatic force or Coulomb’s force between two charges? (a) It is not spherically symmetric. (b) It is a central force (c) It is a conservative force (d) It obeys inverse square law 59 The electric field intensity due to a dipole is zero (a) At mid-point of the dipole (b) at the location of either charge (c) On equatorial line (d) at infinity 60 The ratio of the electrostatic force between two-point charges in air and in a medium of dielectric constant K is: (a) K :1 (b) 1: K (c) K2 :1 (d) 1 :1 ZIET BBSR 8/10/2021 Page 8 61 An electric dipole of dipole moment ‘p’ lies in a stable equilibrium in a uniform electric field E. The work done in rotating the dipole from its position to unstable equilibrium is: (a) pE (b) -2pE (c) 2 pE (d) 0 62 Two-point charges are kept ‘d’ distance apart in air. The distance between them when kept in a medium of dielectric constant (K=9) such that the Coulomb’s force between them remains same is: (a) d = d/9 (b) d = 3d (c) d = 9d (d) d = d/3 63 1. Three charges +q, +2q and +4q at A, B and C respectively are connected by strings as shown in the figure, what is the ratio of tensions in the strings AB and BC? (a) 1:3 (b) 3:1 (c) 1:4 (d) 1:2 64 Two-point charges +Q and +q is separated by a certain distance. If +Q > +q, then in between the charges, the electric field is zero at a point: (a) Closer to +Q (b) closer to +q (c) exactly at the midpoint of line segment joining +Q and +q (d) nowhere on the line segment joining +Q and +q 67 The value of relative permittivity for all the dielectrics is always: (a) Less than unity (b) greater than unity (c) zero (d) equal to unity 65 Electric field intensity is 400 V/m when the distance is 2m from a point charge. At what distance it becomes 100 V/m? (a) 8 m (b) 16 m (c) 4 m (d) 0.5 m 67 The unit V/m is equivalent to: (a) (b) (c) NC/m (d) Nm/C ZIET BBSR 8/10/2021 Page 9 68 When the vector area is held parallel to the field lines, then the magnitude of electric flux is: (a) Maximum (b) minimum (c) zero (d) negative 69 Two identical particles each having a charge of 10 μC are tied with two strings of equal length 1m at a common point. If both the strings makes an angle of 30° with vertical, then mass of each particle will be : (a) 0.1 kg (b) 1 kg (c) 0.15 kg (d) 0.5 kg 70 A point charge q = 10-¹¹ C is placed at 4 cm above a square plate (8 cm x8 cm) having charge density 0.5 x 108 C/m². Find the flux related with it. (a) 0.188 V-m (b) 0.12 V-m (c) 0.288 V-m (d) 0.388 V-m 71 An electric dipole is placed in a non-uniform electric field, then it experiences : (a) a force which must be zero (b) a torque which must be non-zero (c) a force which must be non-zero (d) both a force and a torque which may be non-zero 72 Two positive charges each of equal magnitude q are placed at a separation 2a perpendicular to X-axis. Another negative charge of mass m, is placed midway between the two charges on X-axis. If this charge is displaced from equilibrium state to a distance x(x R) from its axis is (a) directly proportional to r² (b) directly proportional to r³ (c) inversely proportional to r (d) inversely proportional to r² ZIET BBSR 8/10/2021 Page 11 79 A point charge q is placed at a distance a/2 directly above the centre of a square of side a. The electric flux through the square is (a) q/ (c) q/π (b) q/4 (d) q/6 80 When a glass rod is rubbed with silk, it (a) Gains electrons from silk. (b) Gives electrons to silk. (c) Gains protons from silk. (d) Gives protons to silk. 81 A charge Q is divided into two parts of q and Q-q. If the coulomb repulsion between them when they are separated is to be maximum, the ratio of Q/q should be (a) 2:1 (b) ½ (c) 4:1 (d) 1/4 82 Two charges q1 and q2 are separated by a distanc‘d’ from each other in vacuum. If the product of their charges (q1 ×q2) is positive then the nature of electrostatic force acting between them (A) Attractive (B) Repulsive (C) Either repulsive or attractive (D) Insufficient data 83 Two charges q1 and q2 are separated by a distanc‘d’ from each other in vacuum. If the sum of their charges (q1 + q2) is negative, then the nature of electrostatic force acting between them (A) Attractive (B) repulsive (C) Either repulsive or attractive (D) Insufficient data 84 Two pitch balls each having equal mass ‘m’ and equal charge ‘q’on them, are suspended by two insulating string of equal length. If a mica sheet is inserted between them, then the electrostatic force acting between them will: (A) Increase (B) Decrease (C) Remain same (D) Change in force will be equal to the weight of the mica sheet. ZIET BBSR 8/10/2021 Page 12 85 The force between two charges is 100N. If the distance between the two charges is doubled, the force will be (A) 25 N (B) 50N (C) 200N (D) 400N 86 A charge +10µC is placed at origin of Cartesian co-ordinate. If another charge +2µC is moved from (1,0) to (2,0) on x-axis, the work done by the field will be (A) Positive (B) Negative (C) Zero (D) May be positive or negative 87 The dimensions of electric flux is: (A)[ML2T−3I−1] (B) [ML3T−3I−1] (C)[ML3T−2I−1] (D)[ML3T−3I−2] 88 In the process of charging, the mass of the negatively charged body (A) Increases (B) Decreases (C) Remains Constant (D) None of the above 89 Which Quantity is vector Quantity among the following (A)Electric flux (B) Electric charge (C) Electric field (D) Electric potential 90 Charge on a conducting metal sphere cause the electric field lines around it, (A) Perpendicular on the surface of sphere (B)Inside and outside the sphere (C)Outside the sphere in random directions. (D)Only inside of sphere ZIET BBSR 8/10/2021 Page 13 91 What will be the total flux through the faces of the cube with side of length ‘a ‘if a charge of ‘q’ is placed at the corner of the cube? (A) q/ε0 (B) q/2ε0 (C) q/4ε0 (D) q/8ε0 92 Consider an equilateral triangle ABC of side ‘a’. If two equal charges ‘q’ each are placed at the vertices A and B, then the magnitude of electric field intensity at C will be: (A) 0 (B) 0 (C) 0 (D) 0 93 An electric dipole is placed in an external non-uniform electric field. (A) It must experience force bot not torque. (B) It must experience force and may experience torque. (C) It will experience neither force nor torque. (D) It may experience force and must experience torque. 94 Two point charges each of +2µC are placed at certain distance (in meters) If their locations are and , then the electrostatic force between them will be: (A) 1 × 103 N (B) 2 × 103 N (C) 3 × 103 N (D) 4 × 103 N 95 Which of the following is a property of an electric dipole moment? (A) Its magnitude is equal to the product of charge and distance between charges. (B) It is directed from negative charge to positive charge. (C) Net force on the dipole placed in external uniform electric field is zero. (D) All of these. ZIET BBSR 8/10/2021 Page 14 96 What is the value of minimum force acting between two charges placed at 1 m apart from each other (Symbols have their usual meaning) (A) K.e2 (B)K.e2/2 (C)K.e2/4 (D)K.e2/8 97 What will be the value of electric field at the centre of the electric dipole : - (A) Zero (B) Equal to the electric field due to one charge at centre (C) Twice the electric field due to one charge at centre (D) half the value of electric field due to one charge at centre 98 Charge Q is distributed to two different metallic spheres of radii R and 2R such that both spheres have equal surface charge density. Then charge on large sphere is (a) 4Q/5 (b) Q/4 (c) 3Q/5 (d) 5Q/4 99 In the process of charging, the mass of the negatively charged body- (A) Increases (B) Decreases (C) Remains Constant (D) None of the above 100 Electric field lines contracts lengthwise, It shows (a) Repulsion between the same charges. (b) Attraction between opposite charges (c) No relation between force & contraction. (d) Electric field lines does not moves on straight path ZIET BBSR 8/10/2021 Page 15 101 A hemisphere is uniformly charged positively , electric field at a point on the diameter away from the centre. (a) perpendicular to the diameter (b) parallel to the diameter (c) at an angle tilted towards the diameter (d) at an angle tilted away from the diameter. 102 Which particle in an atom can you physically manipulate? (a)protons (b)electrons (c)neutrons (d) you can't manipulate any particle in an atom 103 The SI unit of electric field is (a) N/m (b) N-m (c) N/C (d) N/C² 104 During the lightning thunderstorm, it is advised to stay (a) inside the car (b) under trees (c) in the open ground (d) on the car 105 The spacing between two electric field lines indicates its (a) charge (b) strength (c) position (d) none of these 106 A comb runs through one’s dry hair attracts small bits of paper , is due to (a) comb is a good conductor (b) paper is a good conductor (c) paper atoms get polarised by charged comb (d) the comb possess magnetic properties ZIET BBSR 8/10/2021 Page 16 107 Electric charge on a body is always equal to (a) half of charge on electron (b) zero (c) square of the charge on electro (d) integral multiple of charge on electron ANSWERS KEY Q. NO. ANSWERS 1 C 2 A 3 C 4 A 5 B 6 A 7 D 8 D 9 B 10 D 11 D 12 D 13 C 14 C 15 D 16 B 17 D 18 A 19 A 20 A 21 A 22 C 23 D 24 C 25 D 26 A 27 D 28 A 29 B 30 C 31 D 32 B 33 C 34 A 35 B 36 C ZIET BBSR 8/10/2021 Page 17  37 B 38 D 39 B 40 B 41 C 42 A 43 A 44 A 45 A 46 A 47 D 48 C 49 D 50 B 51 B 52 D 53 D 54 C 55 B 56 B 57 A 58 A 59 D 60 A 61 C 62 D 63 A 64 B 65 B 66 C 67 B 68 A 69 C 70 A 71 D 72 A 73 A 74 B 75 A 76 C 77 A 78 C 79 80 B 81 A 82 B 83 C 84 B 85 A ZIET BBSR 8/10/2021 Page 18  86 B 87 B 88 A 89 C 90 A 91 D 92 C 93 B 94 B 95 D 96 A 97 C 98 A 99 A 100 B 101 A 102 B 103 C 104 A 105 B 106 C 107 D ZIET BBSR 8/10/2021 Page 19  Chapter 1 (Electric Charge and Field). Multiple Choice Questions 1. Minimum value of a charged body can have A. 10-19 C B. 1.6 x 10-19 C C. 1.6 x 1019 C D. 0.8 x 10-19 C 2. Force of attraction between two point charges placed at a distance r from each other is F. If these charges are placed in water with same separation between them, then the force of attraction between them is A. F B. 80 F C. D. Zero 3. Value of dielectric constant of a medium A. increases with increase in temperature of the medium B. decrease with increase in temperature of the medium C. remain the same with increase in temperature of the medium D. nothing can be said 4. When a body becomes negatively charged, its mass A. Decreases B. Increases C. remains the same D. none of these 5. The cause of charging a body is A. transfer of neutrons B. transfer of proton C. transfer of electron D. transfer of both protons and neutrons 6. Dimensional formula of electric field is A. [M L T-3 A-1] ZIET BBSR 8/10/2021 Page 20  B. [M L2 T A-1] C. [M L T2 A-1] D. [ M L T A2] 7. Dimensional formula of electric dipole moment is A. [M0L T A] B. [M L0 T A] C. [ M L T0 A] D. [ M L T A0] 8. The angle between the electric dipole moment and the electric field intensity due to electric dipole at a point on its axial point is A. 90° B. 180° C. 45° D. 0° 9. The angle between the electric dipole moment and the electric field intensity due to electric dipole at a point on its equatorial line is A. 90° B. 180° C. 60° D. 0° 10. Electric field intensity due to electric dipole at a point of distance r from its centre varies as A. R B. r2 C. r3 D. r-3 11. Electric flux ɸ through a closed surface in free space enclosing a charge q is A. ε0q B. q C. q/ ε0 D. ε0/q 12. Electric flux ɸ through a closed surface enclosing an electric dipole is ZIET BBSR 8/10/2021 Page 21  A. ε0q B. q C. q/ ε0 D. zero 13. Conducting plane sheet of surface charge density σ at a distance r is A. σ/ ε0 B. σ/2 ε0 C. σ/2r D. σ/2 ε0r 14. The electric flux over the surface of a sphere if it is charged with 10µC is A. 36 π x 104 NM2/C B. 36 π x 10-4 NM2/C C. 36 π x 106 NM2/C D. 36 π x 10-6NM2/C 15 The dimensional formula of electric charge is Evaluating A. [M0L 0T 1A1 ] B. [M0L 0T –1A1 ] C. [M0L 0T 1A–1] D. [M0L 0T –1A–1] 16 There are two types of electric charges positive charges and negative charges. The Knowledge property which differentiates the two types of charges is: & A. field of charge Understandin B. polarity of charge g C. amount of charge D. strength of charge 17 Which is bigger, one coulomb or charge on an electron? Knowledge A. One coulomb & B. Charge on electron Understandin C. Both are same g D. None of these 18 Quantization of charge implies Knowledge A. charge cannot be destroyed & B. charge exists on particles Understandin C. there is a minimum permissible charge on a particle g ZIET BBSR 8/10/2021 Page 22  D. charge, which is a fraction of a coulomb is not possible 19 Three charges +q, +2q and +4q are connected by strings as shown in the figure, what is Analysis & ratio of tensions in the strings AB and BC? Evaluating A. 1:2 B. 1:3 C. 2:1 D. 3:1 20 Select the correct statements. Coulomb’s law correctly describes the electric force that: Knowledge (i) binds the electrons of an atom to its nucleus. & (ii) binds the protons and neutrons in the nucleus of an atom. Understandin (iii) binds atoms together to form molecules. g A. (i) and (ii) B. (i) and (iii) C. (ii) and (iii) D. (i), (ii), and (iii) 21 If charge q is placed at the centre of the line joining two equal charges Q, the system of Applying & these charges will be in equilibrium if q is: Evaluating A. −4Q B. −Q/4 C. −Q/2 D. +Q/2 22 Electric lines of force: Knowledge A. exist everywhere &Understand B. exist only in the immediate vicinity of electric charges ing C. exist only when both positive and negative charges are near one another D. are imaginary 23 Electric flux emanating through a surface element dS = 5 placed in an electric field E Applying & = 4 + 4 + 4 is Evaluating A. 10 units B. 20 units ZIET BBSR 8/10/2021 Page 23  C. 4 units D. 16 units 24 The Gaussian surface for calculating the electric field due to a charge distribution is Knowledge A. Any surface near the charge distribution & B. Always spherical surface Understandin C. A symmetrical closed surface containing the charge distribution, at every point g of which the electric field has a fixed value D. None of the above 25 The total flux through the faces of the cube with side of length a if a charge 2q is Applying & placed at corner A of the cube is Evaluating A. B. C. D. 26 The electric flux through the surface Analysing A. In fig (iv) is the largest B. In fig (iii) is the least C. In fig (ii) is same as fig (iii) but is smaller than fig (iv) D. Is same for all the figures 27 An infinite line charge produces a field of 18 x 104 N/C at 0.02 m. The linear charge Applying density is A. 2 x10-7 C/m B. 10-8 C/m C. 107 C/m D. 10-4 C/m 28 Eight dipoles of charges of magnitude e each are placed inside a cube. The total Applying ZIET BBSR 8/10/2021 Page 24  electric flux coming out of the cube will be A. B. C. D. Zero 29 Number of electrons in one coulomb of charge will be Knowledge (A) 1.6 X 1019 (B) 1.6 X 1018 (C) 6.25 X 1019 (D) 6.25 X 1018 30 The force between two charges 0.06m apart is 5 N. If each charge is moved towards the other by Application 0.01m, then the force between them will become (A) 7.25 N (B) 11.25 N (C) 22.5 N (D) 45.00 N 31 Three equal charges each +Q, placed at the corners of on equilateral triangle of side a what will be application the force on any charge (A) (B) (C) (D) 32 q, 2q, 3q and 4q charges are placed at the four corners A, B, C and D of a square. The Understandin field at the centre O of the square has the direction along. g ZIET BBSR 8/10/2021 Page 25  (A) AB (B) CB (C) AC (D) BD 33 The electric field lines due to two charges q and Q are sketched in the figure. Choose the Knowledge correct statement:- (A) Q is positive and |Q|  |q| (B) Q is negative and |Q|  |q| (C) Q is positive and |Q| < |q| (D) Q is negative and |Q| < |q| 34 An electric dipole in a uniform electric field experiences Understandin (A) Force and Torque both g (B) Force but no torque (C) No force but torque (D) Neither force nor Torque 35 A point charge placed at any point on the axis of an electric dipole at some large distance Application experiences a force F. The force acting on the point charge when it’s distance from the dipole is doubled is (A) (B) (C) (D) 36 An electric dipole has the magnitude of its charge as q and its dipole moment is p. It is Analysis placed in a uniform electric field E. If its dipole moment is along the direction of the field, the force on it and its potential energy are respectively ZIET BBSR 8/10/2021 Page 26  (A) q.E and p.E (B) Zero and minimum (C) q.E and maximum (D) 2q.E and minimum 37 If the electric flux entering and leaving an enclosed surface respectively is and. The Application electric charge inside the surface will be (A) (B) (C) (D) 38 A cube of side l is placed in a uniform field E such that the side of the cube is along three Knowledge coordinate axis, where E  E. The net electric flux through the cube is (A) Zero (B) l2 E (C) 4l2E (D) 6l2E 39 For a given surface the Gauss’s law is stated as. From this we can conclude Analysis that (A) E is necessarily zero on the surface (B) E is perpendicular to the surface at every point (C) The total flux through the surface is zero (D) The flux is only going out of the surface 40 A cube of side b has a charge q at each of its vertices. The electric field due to this charge Synthesis distribution at the center of this cube will be (A) (B) (C) (D) 41 According to Gauss’s theorem, electric field of an infinitely long straight wire is Evaluation proportional to (A) ZIET BBSR 8/10/2021 Page 27  (B) (C) (D) 42 Which of the following charge is not possible Application A. 1.6 x 10-17 C B. 1.6 x 10-18 C C. 1.6 x 10-19 C D. 1.6 x 10-20 C 43 Charge is the property associated with matter due to which it produces and experiences Knowledge A. electric effects only B. magnetic effects only C. both electric and magnetic effects D. None of these 44 Charge is Knowledge A. Transferable B. associated with mass C. conserved D. All of these 45 A body is positively charged, it implies that application A. there is only positive charge in the body. B. there is positive as well as negative charge in the body but the positive charge is more than negative charge C. there is equal positive and negative charge in the body but the positive charge lies in the outer regions D. negative charge is displaced from its position 46 On rubbing, when one body gets positively charged and other negatively charged, the application electrons transferred from positively charged body to negatively charged body are A. valence electrons only B. electrons of inner shells C. both valence electrons and electrons of inner shell D. yet to be established 47 If a body is negatively charged, then it has application A. excess of electrons ZIET BBSR 8/10/2021 Page 28  B. excess of protons C. deficiency of electrons D. deficiency of neutrons 48 On charging by conduction, mass of a body may Knowledge A. Increase B. Decreases C. increase or decrease D. None of these 49 What happens when some charge is placed on a soap bubble? application A. Its radius decreases B. Its radius increases C. The bubble collapses D. None of these 50 In general, metallic ropes are suspended on the carriers taking inflammable materials. application The reason is A. to control the speed of the carrier. B. to keep the centre of gravity of the carrier nearer to the earth. C. to keep the body of the carrier in contact with the earth. D. none of these. 51 A charge Q is divided into two parts of q and Q – q. If the coulomb repulsion between Evaluation them when they are separated is to be maximum, the ratio of Q/q should be A. 2:1 B. 1:2 C. 4:1 D. 1:4 52 The magnitude of electric field intensity E is such that, an electron placed in it would application experience an electrical force equal to its weight is given by A. Mge B. mg/e C. e/mg D. e²g/m² 53 SI unit of permittivity of free space is Knowledge A. Farad B. Weber ZIET BBSR 8/10/2021 Page 29  C. C2N-1 m-2 D. C2N-1 m2 54 The unit of electric dipole moment is Knowledge A. Newton B. Coulomb C. Farad D. Debye 55 An electric dipole is placed at an angle of 30° with an electric field of intensity 2 × 105 Evaluation NC–1, It experiences a torque of 4 Nm. Calculate the charge on the dipole if the dipole length is 2 cm. A. 8 mC B. 4 mC C. 8 μC D. 2 mC 56 If the dipole of moment 2.57 × 10–17 Cm is placed into an electric field of magnitude 3.0 Evaluation × 104 N/C such that the fields lines are aligned at 30° with the line joining P to the dipole, what torque acts on the dipole? A. 7.7 × 10–13 Nm B. 3.855 × 10–13 Nm C. 3.855 × 10–15 Nm D. 7.7 × 10–15 Nm 57 The surface considered for Gauss’s law is called- knowledge A. Closed surface B. Spherical surface C. Gaussian surface D. Plane surface 58 When air is replaced by a medium of dielectric constant K, the force of attraction between two charges separated by a distance r- application A. decreases K times B. remains unchanged C. increases K times D. increases K-2 59 Which of the following figures represent the electric field lines due to a single negative understandin point charge? g ZIET BBSR 8/10/2021 Page 30 60 Which of the following is the unit of electric charge? knowledge A. Coulomb B. Statcoulomb C. Abcoulomb D. all of the above 61 A body is positively charged. It has understandin A. excess of positrons g B. excess of electrons C. deficiency of electrons D. deficiency of protrons 62 What will be the value of electric field at the centre of the electric dipole? application A. Zero B. Equal to the electric field due to one charge at centre C. Twice the electric field due to one charge at centre D. Half the value of electric field due to one charge at centre 63 The dimentional formula of electric flux is – knowledge A. [M1 L1 T-2] B. [M1 L3 T-3 A-1] C. [M2L2 T-2 A-2 ] D. [M1 L-3 T3 A] 64 Consider a region in which there are various types of charges but the total charge is zero. analysis At points outside the region A. The electric field is necessarily zero. B. the electric field is due to the dipole moment of the charge distribution only. C. the work done to move a charged particle along a closed path ,away from the region , will be zero. D. none of these ZIET BBSR 8/10/2021 Page 31 65 If electric field is uniform , then the electric lines of forces are application A. Divergent B. Convergent C. Circular D. Parallel 66 In which of the following case the electric field strength is independent of distance? application A. Due to a point charge B. Due to a line charge C. Due to a spherical charge D. Due to infinite flat sheet of charge 67 An electric dipole placed in a non –uniform electric field can experience analysis A. a force but not a torque B. a torque but not a force C. always a force and a torque D. neither a force nor a torque 68 An infinite number of identically charged bodies are kept along the x –axis at points x = application 0,1m , 2m, 4 m, 8m, 16 m , and so on. All other charges repel the charge at the origin with a force of 1.2 N. Find magnitude of each charge. A. 9µC B. 10 µC C. 11 µC D. 12 µC 69 The electric flux emerging out from 1C charge is understandin A. 1/ɛ0 g B. 4π C. 4π/ ɛ0 D. ɛ0 70 When the distance between two charged particles is halved , the Coulomb force between application them becomes A. one-half B. one fourth C. double D. four times ANSWER KEY Q.N. 1 2 3 4 5 6 7 8 9 10 KEY B C B B C A A D B D Q.N. 11 12 13 14 15 16 17 18 19 20 KEY C D A A A B A D B B Q.N. 21 22 23 24 25 26 27 28 29 30 KEY B B B C C D A D D B ZIET BBSR 8/10/2021 Page 32  Q.N. 31 32 33 34 35 36 37 38 39 40 KEY D B D C D B B A C D Q.N. 41 42 43 44 45 46 47 48 49 50 KEY B D C D B A A C B C Q.N. 51 52 53 54 55 56 57 58 59 60 KEY A B C D D B C A B D Q.N. 61 62 63 64 65 66 67 68 69 70 KEY C C B C D D C B B D Committee Members : 1- Sri Rajesh Dhawan (Principal K V MASIMPUR) Mob.9401098099 , [email protected], 2- Mr. SANDEEP KUMAR TIWARI (PGT-PHYSICS KV MASIMPUR) Mob. 80812333330, [email protected], 3- Mr. AYUSH AGARWAL (PGT-PHYSICS KV MASIMPUR) Mob. 8299179206, [email protected], 4- Mr. PRIYAM KUNDU (PGT-PHYSICS KV SILCHAR) Mob. 8016819148, [email protected], 5- Mrs. RUCHIKA KHATRI (PGT-PHYSICS KV KUMBHIGRAM) Mob. 9953473874, [email protected], 6- Mr. VINIT KUMAR SINGH (PGT-PHYSICS ONGC SRIKONA) Mob. 7651999617, [email protected], ZIET BBSR 8/10/2021 Page 33  As Per Revised CBSE Curriculum 2024-25 Classroom Teaching & Animated Videos Playlists We take immense pleasure in serving you. 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