PracticeTest - D02 Oct 2024
PracticeTest - D02 Oct 2024
1. A plastic rod rubbed with wool is found to have a negative charge of 8 ´ 10–7 C. The no. of electrons
transferred (from which to which ?) is ...... .
(A) 5 ´ 1012, from plastic rod to wool (B) 5 ´ 1011, from plastic rod to wool
(C) 5 ´ 1010, from plastic rod to wool (D) 5 ´ 1012, from wool to plastic rod
2. The dimensional formula of electric flux is ......
(A) [M–1 L3 T–3 A–1] (B) [M1 L3 T–3 A–1] (C) [M1 L–3 T–3 A–1] (D) [M1 L3 T3 A–1 ]
3. How much charge should be placed on a spherical shell of radius 25 cm to have a surface charge
3
density of C/m2 ?
p
(A) 0.25 C (B) 0.75 C (C) 0.57 C (D) 0.5 C
4. Which of the following is the graph of electric field versus distance r from the centre of a charged
spherical shell ? R is the radius of the sphere shell, ‘O’ is centre of shell.
(A) E (B) E (C) E (D) E
E µ 12 E µ 12 E µ 12
r
µ
r r r
E
r=R r=R
O r® O r® O r=R r® O r=R r®
5. Suppose [e0] is permittivity of free space. If M = mass, L = length, T = time and A = electric current,
then ......
(A) [e0] = [M–1 L–3 T2 A] (B) [e0] = [M–1 L–3 T4 A2]
(C) [e0] = [M–1 L2 T–1 A–2] (D) [e0] = [M–1 L2 T–1 A]
6. The electric intensity due to a dipole of length 10 cm and having a charge of 500 mC at point on the
axis at a distance 20 cm from one of charges in air is ......
(A) 6.25 ´ 107 N/C (B) 9.28 ´ 107 N/C (C) 13.1 ´ 1011 N/C (D) 20.5 ´ 107 N/C
7. An electric dipole is at 30° with uniform electric field of 2 × 105 N/C. The torque acting on it is 4 Nm.
If length of dipole is 2 cm, then what will be the charge at one end of dipole ?
(A) 5 mC (B) 7 mC (C) 8 mC (D) 2 mC
8. Electric field is proportional to ...... for the case of infinite long wire.
1 1 1
(A) (B) (C) (D) r0
r r2 r3
9. The number of electric field lines coming out of charge ...... kept in a vacuum is 1.13 ´ 1011
[e0 = 8.85 ´ 10–12 C2N–1m–2]
(A) 1C (B) 1 mC (C) 2C (D) 2 mC
10. The potential energy of the positive charge brought from a point of lower potential to a point of
higher potential will ...... (Que. Bank - 2024)
(A) decreases (B) increases (C) remains constant (D) disappers
® Ù
11. Assume that an electric field E = 30 x2 i exists in space. Then the potential difference VA – V0, where
V0 is the potential at the origin and VA the potential at x = 2m is :
(A) – 80 J/C (B) 80 J/C (C) 120 J/C (D) – 120 J/C
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® Ù
Assume that an electric field E = 30 x2 i exists in space. Then the potential difference VA – V0, where
V0 is the potential at the origin and VA the potential at x = 2m is :
(A) – 80 J/C (B) 80 J/C (C) 120 J/C (D) – 120 J/C
12. Seven capacitors, each of capacitance 2 mF are to be connected in configuration to obtain an effective
6
capacitance of mF . Which of the combinations shown in figures below will achieve the desired value ?
13
13. The capacitance of a parallel plate capacitor with air as medium is 6 mF. With the introduction of a
dielectric medium, the capacitance becomes 30 mF. The permittivity of the medium is (e0 = 8.85 ´
10–12 C2 N–1 m –2 )
(A) 1.77 ´ 10–12 C2 N–1 m–2 (B) 0.44 ´ 10–10 C2 N–1 m–2
(C) 5.00 C2 N–1 m–2 (D) 0.44 ´ 10–13 C2 N–1 m–2
14. The work done to move unit test charge on an equipotential surface is ......
(A) negative (B) positive (C) zero (D) infinite
15. The electric potential at a distance ...... due to the charge 4 ´ 10–7 C is 4 ´ 104 V.
(A) 9 m (B) 9 mm (C) 9 cm (D) 9 mm
16. Current density J is ...... electric field E.
(A) inversely proportional to (B) directly proportional to
(C) inversely proportional to square (D) directly proportional to square of
17. Current flowing through a conductor varies with time by relation I = (3 + 2t). Charge flowing through
cross-section of conductor in time interval t = 0 to t = 4 sec will be ...... C.
(A) 20 (B) 24 (C) 28 (D) 14
18. SI unit of resistivity and its dimensional formula is ...... .
(A) W m, [M1 L2 T–3 A–2 ] (B) W m, [M1 L3 T–3 A–2 ]
(C) W m–1, [M1 L3 T–3A–2 ] (D) W–1 m, [M1 L3 T–3 A–2 ]
19. A circle of 2.5 meter radius is made using a wire of uniform cross section of 1 m2. If resistance of
this wire is 10p W, resistivity of the material of the wire is .........
0.25
(A) 4p W m (B) Wm (C) 2 W m (D) 1 W m
p
20. Resistance of coil at 100°C is 4.2 W. If temperature coefficient of resistance of material is 0.004 (°C)–1,
what will be its resistance at 0°C ?
(A) 5 W (B) 3 W (C) 4 W (D) 3.5 W
21. Kirchhoff’s junction shows ......
(A) conservation of energy. (B) conservation of angular momentum.
(C) conservation of linear momentum. (D) conservation of charge.
22. Magnetic force exerted on charge moving in magnetic field is ......
(A) in the direction of magnetic field. (B) in the opposite direction of magnetic field.
(C) is perpendicular to both, velocity and field. (D) is parallel to both, velocity and field.
23. The angular speed of the charged particle is independent of ......
(A) its mass (B) its linear speed (C) charge of particle (D) magnetic field
24. When a helium nucleus revolves in a circular orbit of radius 0.8 m, magnetic field produced at the
centre would be ...... T. (Given f = 1 Hz)
(A) 10–18 m0 (B) 5 ´ 10–19 m0 (C) 2 ´ 10–19 m0 (D) 10–19 m0
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When a helium nucleus revolves in a circular orbit of radius 0.8 m, magnetic field produced at the
centre would be ...... T. (Given f = 1 Hz)
(A) 10–18 m0 (B) 5 ´ 10–19 m0 (C) 2 ´ 10–19 m0 (D) 10–19 m0
25. A solenoid has 1000 turns wrapped on a 40 cm length. It carries a current of 10 A. The magnetic field
in the middle of the solenoid is ...... .
(A) 0.0314 T (B) 0.0628 T (C) 0.0924 T (D) 0.1256 T
26. .......... is known as current sensitivity of a galvanometer.
(A) Current per unit angular deflection (B) Angular deflection per unit current
(C) current for maximum deflection (D) None of above
27. For ideal diamagnetic substance, magnetic susceptibility is ...... .
(A) –1 (B) 0 (C) +1 (D)
28. A short bar magnet placed with its axis at 30° with a uniform external magnetic field of 0.25 T
experiences a torque of magnitude equal to 4.5 ´ 10–2 J. What is the magnitude of magnetic moment
of the magnet ?
(A) 3.6 J T–1 (B) 0.036 J T–1 (C) 0.36 J T–1 (D) 36 J T–1
29. The unit of magnetisation (M) is ......
(A) Am–2 (B) Am–1 (C) Cm–1 (D) Cm–2
30. Magnetic field lines ......
(A) always intersect. (B) always form closed loops.
(C) are more crowded away from the magnet. (D) can not pass through vacuum.
^
31. A bar magnet is placed on X-axis. Its dipole moment is 50 i Am2. If magnetic field is
® ^ ^
B = (0.5 i + 3.0 j ) T, then torque acting on it will be ......
^ ^ ^ ^
(A) 175 k (B) 150 k (C) 75 k (D) 25 5 k
32. Which of the following behaves as paramagnetic substance ?
(A) Nickel (B) Iron (C) Aluminium (D) Hydrogen
33. A straight line conductor of length 0.4 m is moved with a speed of 7 m/s perpendicular to a magnetic
field of intensity 0.9 Wb/m2. The induced emf across the conductor is .......
(A) 1.26 V (B) 2.52 V (C) 5.04 V (D) 25.2 V
34. A coil of 50 turns is pulled in 0.02 s from between the poles of a magnet, where its area includes
magnetic flux of 31 ´ 10–6 Wb to the place, where its area includes 1 ´ 10–6 Wb. The average emf
is .........
(A) 7.5 ´ 10–2 V (B) 7.5 ´ 10–3 V (C) zero (D) 7.5 ´ 10–4 V
35. A magnet is moving towards a coil along its axis and the emf induced in the coil is e. If the coil also
starts moving towards the magnet with the same speed, the induced emf will be ......
e
(A) 2 (B) e (C) 2e (D) 4e
36. The flux linked with a coil at any instant ‘t’ is given by F = 10t2 – 50t + 250. The induced emf at t
= 3s is ..........
(A) 10V (B) 190V (C) –190V (D) –10V
37. A pair of adjacent coils has a mutual inductance of 1.5 H. It the current in one coil changes from
0 to 20 A in 0.5 sec. what is the change of flux linkage with the other coil ?
(A) 15 Wb (B) 30 Wb (C) 45 Wb (D) 60 Wb
38. Which one of the following is an equation of magnetic energy density ?
1 B2 2B2 B2
(A) m0 B2 (B) (C) (D)
2 2m0 m0 m0
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Which one of the following is an equation of magnetic energy density ?
1 2 B2 2B2 B2
(A) m0 B (B) (C) (D)
2 2m0 m0 m0
39. rms value of AC voltage is ......
(A) average value of AC over one periodic time.
(B) square root of average of square of AC voltage over one periodic time.
(C) average of square of AC voltage over one periodic time.
(D) average value of square of voltage over one second.
40. When 10 A current passes through 12 ù resistance, maximum voltage across it is ......
(A) 20 V (B) 90 V (C) 169.68 V (D) 120 V
400
41. In an A.C. circuit of frequency Hz, reactance of capacitance is 25ù then the value of C = .....
<
(A) 25 ëF (B) 50 ëF (C) 400 ëF (D) 100 ëF
42. If we consider the phasor I in positive X-direction for an A.C. circuit which has only inductor, then
the phasor of V is in ........ direction.
(A) positive X (B) positive Y (C) negative X (D) negative Y
43. For circuits used for transporting electric power, a low power factor implies ......
(A) power increases in transmission (B) remains constant in transmission
(C) small power loss in transmission (D) large power loss in transmission
44. In a series LCR circuit XL = 10 W, XC = 4 W and R = 6 W. Find power factor ?
1 1 1
(A) 2 (B) (C) (D)
2 2 2
45. ) An object is placed at 15 cm in front of a concave mirror of radius of curvature 20 cm. The image
distance would be ...... cm.
(A) – 32 (B) – 28 (C) – 30 (D) – 22
46.
182) The focal length of objective lens and eyepiece is fo and fe respectively. Magnifying power of the
telescope = ...... .
fe fo
(A) (B) fo – fe (C) (D) fo + fe
fo fe
47. ) For compound microscope fo = 1 cm, fe = 2 cm and tube length (L) = 20 cm. Then the total
magnification is ...... .
(A) 2.5 (B) 200 (C) 250 (D) 20
48. ) Double convex lenses are to be manufactured from a glass of refractive index 1.55 with both faces
of the same radius of curvature. What is the radius of curvature required if the focal length is to be
20 cm ?
(A) 22 cm (B) 2.2 cm (C) 44 cm (D) 4.4 cm
49. When light ray travels from denser to rarer medium and if q1 is incidence and q2 is refraction angle,
then ......
(A) q1 > q2 (B) q1 < q2 (C) q1 = q2 (D) q2 > q1 or q1 > q2
50. Current I is flowing in a coil and two points B1 and B2 are on the axis of coil at a distance 0.05 m and 0.2
meter respectively from centre of coil. If ratio of magnetic field at point B1 and B2 are in 8 : 1, then find
radius of coil ......
(A) 0.1 m (B) 0.2 m (C) 0.7 m (D) 0.8 m
3. A short bar magnet of magnetic moment m = 0.32 JT–1 is placed in a uniform magnetic field of
0.15 T. If the bar is free to rotate in the plane of the field, which orientation would correspond to
its :
(a) stable, and
(b) unstable equilibrium ? What is the potential energy of the magnet in each case ?
4. State and explain Faraday’s law of electromagnetic induction.
5. Explain mobility of conductor and derive equation of mobility.
6. Define power of lens, obtain its equation and write its SI unit.
Section C
//X
• Write the answer of any 6 questions from given questions. [Each carries 3 Marks] [18]
7. Obtain the relation between electric field and electric potential.
1 1
8. The electric field components in figure are E x = ax 2, Ey = Ez = 0 in which a = 800 N/C m 2 .
Calculate (a) the flux through the cube and (b) the charge within the cube. Assume that a = 0.1 m.
[e0 = 8.854 ´ 10–12 C2N–1m–2]
y
a
a
a
n̂L n̂R
a x = 2a x
a
a
z
9. Two charges 3 ´ 10–8 C and – 2 ´ 10–8 C are located 15 cm apart. At what point on the line joining the
two charges is the electric potential zero ? Take the potential at infinity to be zero.
10. The four arms of a Wheatstone bridge figure have the following resistances :
AB = 100 W, BC = 10 W, CD = 5 W and DA = 60 W
B
I4 – Ig
100 10
Ig
I1
A I 15 C
2
60 I2 5
I I2 + Ig I
D
10V
A galvanometer of 15 W resistance is connected across BD. Calculate the current through the
galvanometer when a potential difference of 10 V is maintained across AC.
11. Two moving coil meters, M1 and M2 have the following particulars :
R1 = 10 W, N1 = 30
A1 = 3.6 × 10–3 m2, B1 = 0.25 T
R2 = 14 W, N2 = 42 Wish You - All The Best
A2 = 1.8 × 10–3 m2, B2 = 0.50 T
Two moving coil meters, M1 and M2 have the following particulars :
R1 = 10 W, N1 = 30
A1 = 3.6 × 10–3 m2, B1 = 0.25 T
R2 = 14 W, N2 = 42
A2 = 1.8 × 10–3 m2, B2 = 0.50 T
(The spring constants are identical for the two meters). Determine the ratio of (a) current sensitivity
and (b) voltage sensitivity of M2 and M1.
12. Obtain the expression for the magnetic energy stored in a solenoid in terms of magnetic field B, area
A and length l of the solenoid. (b) How does this magnetic energy compare with the electrostatic energy
stored in a capacitor ?
13.1. What is compound microscope ? Explain by figure of its construction.
13.2. Obtain the equation of magnification for compound microscope.
Section D
//X
• Write the answer of any 3 questions from given questions. [Each carries 4 Marks] [12]
14. An early model for an atom considered it to have a positively charged point nucleus of charge Ze,
surrounded by a uniform density of negative charge up to a radius R. The atom as a whole is neutral.
For this model, what is the electric field at a distance r from the nucleus ?
r
+
R r
P
15. Obtain the relation of phase between instantaneous current and voltage with the help of phase
diagram for series LCR circuit.
16.1. Derive Dm = A(n21 – 1) for thin prism.
16.2. A prism is made of glass of unknown refractive index. A parallel beam of light is incident on a face
of the prism. The angle of minimum deviation is measured to be 40°. What is the refractive index
of the material of the prism? The refracting angle of the prism is 60°. If the prism is placed in water
(refractive index 1.33), predict the new angle of minimum deviation of a parallel beam of light.
17.1. What is series connection of cell ? Derive equation of equivalent emf of two cells with emf e1 and e2
connected in series.
17.2. What is parallel connection of cell ? Obtain equation of equivalent emf of two cells connected in
parallel.
Student Name : _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Roll Number : 0 1 2 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9
A B C D A B C D A B C D A B C D A B C D
1. 11. 21. 31. 41.
2. 12. 22. 32. 42.
3. 13. 23. 33. 43.
4. 14. 24. 34. 44.
5. 15. 25. 35. 45.
6. 16. 26. 36. 46.
7. 17. 27. 37. 47.
8. 18. 28. 38. 48.
9. 19. 29. 39. 49.
10. 20. 30. 40. 50.
Student Name : _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Roll Number : 0 1 2 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9
A B C D A B C D A B C D A B C D A B C D
1. 11. 21. 31. 41.
2. 12. 22. 32. 42.
3. 13. 23. 33. 43.
4. 14. 24. 34. 44.
5. 15. 25. 35. 45.
6. 16. 26. 36. 46.
7. 17. 27. 37. 47.
8. 18. 28. 38. 48.
9. 19. 29. 39. 49.
10. 20. 30. 40. 50.
CHAROTAR MILLAT ENGLISH MEDIUM HIGH SCHOOL ANAND
Chapters : 1 to 7 & 9 Std 12 : Physics Date : 03/10/24
Total Marks : 50 Practice Test Time : 60 Minutes
Marks Identifier :
A B C D A B C D A B C D A B C D A B C D
1. 11. 21. 31. 41.
2. 12. 22. 32. 42.
3. 13. 23. 33. 43.
4. 14. 24. 34. 44.
5. 15. 25. 35. 45.
6. 16. 26. 36. 46.
7. 17. 27. 37. 47.
8. 18. 28. 38. 48.
9. 19. 29. 39. 49.
10. 20. 30. 40. 50.
Marks Identifier :
A B C D A B C D A B C D A B C D A B C D
1. 11. 21. 31. 41.
2. 12. 22. 32. 42.
3. 13. 23. 33. 43.
4. 14. 24. 34. 44.
5. 15. 25. 35. 45.
6. 16. 26. 36. 46.
7. 17. 27. 37. 47.
8. 18. 28. 38. 48.
9. 19. 29. 39. 49.
10. 20. 30. 40. 50.
CHAROTAR MILLAT ENGLISH MEDIUM HIGH SCHOOL ANAND
Chapters : 1 to 7 & 9 Std 12 : Physics Date : 03/10/24
Total Marks : 90 Practice Test Time : 150 minutes
Section A
//X
• Choose correct answer from the given options. [Each carries 1 Mark] [50]
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13.2.