· pdf file12/12/2017 · ... the value of permittivity of free space is ......

+2 PHYSICS MJK
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1
Q BANK
NAME : .. CLASS : .
Book back-1 marks& public 1 marks March -2017
updated
3 mark questions with page numbers
5 mark questions
10 mark questions
Creative ,Topic wise one marks
Full portion one marks for Board Examination
+2 PHYSICS
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ONE MARKS BOOK BACK & PUBLIC QUESTIONS(M 2006 M 2017)
1. ELECTROSTATICS
BOOK BACK 1. A glass rod rubbed with silk acquires a charge of +8 x 10-12 C, the number of electrons it has
gained or lost a) 5 x 10-7 (gained) b) 5 x 107 (lost) c) 2 x 10-8 (lost) d) -8 x 10-12 (lost)
2. The electrostatic force between two point charges kept at a distance d apart, in a medium r = 6, is 0.3 N. The force between them at the same separation in vacuum is
a) 20 N b) 0.5 N c) 1.8 N d) 2 N 3. Electric field intensity is 400 Vm-1 at a distance of 2m from a point of charge. It will be
100 Vm-1 at a distance? (Mar 07, June 12,Oct 12) a) 50 cm b) 4 cm c) 4 m d) 1.5m
4. Two point charges +4q and +q are placed 30cm apart. At what point on the line joining them the electric field is zero?
a) 15 cm from the charge q b) 7.5 cm from the charge q c) 20cm from the charge 4q d) 5 cm from the charge q 5. A dipole is placed in a uniform electric field with its axis parallel to the field. It experiences. (Mar 06, 07, Oct 07, 08,J-13)
a) only a net force b) only a torque c) both a net force and torque d) neither a net force nor a torque.
6. If a point lies at a distance x from the midpoint of the dipole, the electric potential at this point is proportional to (Mar 11, 14)
a) 2
1
x b)
3
1
x c)
4
1
x d)
2/3
1
x
7. Four charges +q, +q, -q and q respectively are placed at the corners A, B, C and D of a square of side a. The electric potential at the centre O of the square is (Oct 06)
a) a
q
04
1
b)
a
q2
4
1
0 c)
a
q4
4
1
0 d) zero
8. Electrical potential energy (U) of two point charges is (Mar 09, June 10, 11,O-13)
a) 2
0
21
4 r
qq
b)
r
qq
0
21
4 c) pE cos d) pE sin
9. The workdone in moving 500C charge between two point on equipotential surface is (J- 07, 10 March 08, 10, 12, Oct 11,J-14)
a) zero b) finite c) finite negative d) infinite 10. Which of the following quantities is scalar? (June 06, 08, Mar 09, Oct 10, 11) a) dipole moment b) electric force c) electric field d) electric potential 11. The unit of permittivity is (Mar 08, Oct 08, June 11,Oct 12,O-13)
a) C2 N-1 m-2 b) Nm2 C-2 c) H m-1 d) N C-2m-2 12. The number of electric lines of force originating from a charge of 1C is
a) 1.129 x 1011 b) 1.6 x 10-19 c) 6.25 x 1018 d) 8.85 x 1012
13. The electric field outside the plates of two oppositely charged plane sheets of charge density is (M- 08, 11, O- 09, J- 11,M- 13,14,O-14)
a) 02
b)
02
c) 0
d) zero
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14. The capacitance of a parallel plate capacitor increases form 5F to 60F when a dielectric is
filled between the plates. The dielectric constant of the dielectric is (J- 08, O-10,J-14,O-14) a) 65 b) 55 c) 12 d) 10
15. A hollow metal ball carrying an electric charge produces no electric field at points (M- 10,12,J-13,O-13) a) outside the sphere b) on its surface c) inside the sphere d) at a distance more than twice ANSWERS
OTHER IMPORTANT QUESTIONS
1. The unit of electric flux is (Mar 06, June 09) a) N m2 C-1 b) N m-2 C-1 c) N m2 C d) N m-2 C 2. The work done in moving 4C charge from one point to another in an electric field is 0.012 J.
The potential difference between them is (Mar 06) a) 3000V b) 6000 V c) 30V d) 48 x 103 V
3. Torque on a dipole in a uniform electric field is maximum, when angle between P and E is (June 06, Oct 09) a) 0 b) 90 c) 45 d) 180 4. Potential energy of two equal negative point charges of magnitude 2C placed 1m apart in air is
(June 06) a) 2 J b) 0.36 J c) 4 J d) 0.036 J 5. A hollow metallic spherical shell carrying an electric charge produces no electric field at points (June 06, Mar 12) a) on the surface of the shell b) inside the shell c) at infinite distance from the centre of the shell d) outside the shell 6. The value of permittivity of free space is (Oct 06) a) 8.854 x 1012C2N-1m-2 b) 9 x 108 C2N-1m-2
c) 2129109
1
mNC d) 21291094
1
mNC
7. The unit of electric field intensity is (Oct 06, June 08, Mar 09,O-14) a) NC-2 b) NC c) Vm-1 d) Vm 8. The principle used in lightning conductors (Oct 06) a) corona discharge b) mutual induction c) self-induction d) electromagnetic induction 9. The unit of electric dipole moment is (Mar 07) a) volt / metre (V / m) b) coulomb / metre (C / m)
c) volt metre (V m) d) coulomb metre (C m) 10. Electric potential energy of a electric dipole in an electric field is given as (Mar 07) a) pE sin b) pE sin c) pE cos d) pE cos 11. Which of the following is not a dielectric? (June 07) a) Ebonite b) Mica c) Oil d) Gold 12. The direction of electric field at a point on the equatorial line due to an electric dipole is a) along the equatorial line towards the dipole (June 07)
b) along the equatorial line away from the dipole
1.(b)
2.(c) 3.(c) 4.(c) 5.(d) 6.(a) 7.(d) 8.(b) 9.(a) 10(d) 11(a) 12(a) 13(d) 14(c) 15(c)
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2F 2F
A B
6F
c) parallel to the axis of the dipole and opposite to the direction of dipole moment d) parallel to the axis of the dipole and in the direction of dipole moment 13. In the given circuit, the effective capacitance between A and B will be (June 07) 3F a) 3 F b) 36 / 13 F c) 13F d) 7F 14

· pdf file12/12/2017 · ... the value of permittivity of free space is ......

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