Goa Board Class 12 Question Paper 2022 Physics

2022 XI 12 0230 Seat No.

Time : 1½ Hours FIRST-TERM PHYSICS
Subject Code

H 4 7 0 2
Total No. of Questions : 40 (Printed Pages : 16) Maximum Marks : 40

INSTRUCTIONS : (i) Paper contains 40 multiple choice questions carrying
1 mark each.

(ii) Every question has four choices for its answers (A), (B),
(C) and (D) and only one of them is the correct answer.

(iii) On the OMR sheet, for each question number, darken
with a ball point pen ONLY ONE bubble corresponding
to what you consider to be the most appropriate answer,
from among the four choices.

(iv) Please note that it is not possible to change the
answer once you have filled up the bubble with
a ball point pen. Hence care must be taken while
darkening the bubbles.

(v) For each question, you will be awarded ONE mark if
you have darkened only the bubble corresponding to
the correct answer. In all other cases, you will get zero
mark. There is no negative marking.

(vi) Only one OMR sheet will be provided.

(vii) Use only Black or Blue ball point pen.

(viii) You may use the following values of physical constants
wherever necessary.

c = 3 × 108 ms–1, e = 1.6 × 10–19 C, h = 6.6 ×10–34 Js,
m c = 9.1 × 10 –31 kg, 0
= 4 × 10 –7 TmA –1 ,

0
= 8.85 × 10–12 C2N–1m–2.
H-4702 [FT] 1 P.T.O.

1. Which of the following electromagnetic radiations has the lowest wavelength ?

(A) Radio waves

(B) Infrared rays

(C) Gamma rays

(D) Microwaves

2. Two electric field lines can never cross each other because :

(A) Electric field lines are closed curves

(B) Electric field lines repel each other

(C) Electric field lines are crowded only near the charge

(D) Electric field has a unique direction at each point

3. Consider a system of six charges + 1 C, + 2 C, – 3 C, + 4 C, – 5 C

and + 6 C. The total charge of the system is :

(A) + 5 C

(B) – 5 C

(C) + 21 C

(D) + 2 C

4. To convert a galvanometer into a voltmeter :

(A) a high resistance is connected in parallel with galvanometer

(B) a low resistance is connected in series with galvanometer

(C) a high resistance is connected in series with galvanometer

(D) a low resistance is connected in parallel with galvanometer

H-4702 [FT] 2

5. Resistance of the colour-coded carbon resistor is 0.58 ± 5%. Then the
sequence of colour code is :

(A) Green Grey Gold Silver

(B) Green Grey Silver Gold

(C) Grey Green Silver Gold

(D) Grey Green Gold Silver

6. Figure shows electric field lines due to a charge configuration. From this
figure it is concluded that :

(A) q1 and q2 are positive and q2 > q1

(B) q1 and q2 are positive and q1 > q2

(C) q1 and q2 are negative and q1 q2

(D) q1 and q2 are negative and q2 q1

7. The electric and magnetic field of a propagating electromagnetic wave are
in :

(A) phase and parallel to each other

(B) opposite phase and perpendicular to each other

(C) opposite phase and parallel to each other

(D) phase and perpendicular to each other

H-4702 [FT] 3 P.T.O.

8. The equivalent capacitance of the combination shown in the following figure
is :

(A) C/2

(B) 3C/2

(C) 3C

(D) 2C

9. When a negatively charged particle is brought closer to another negatively
charged particle then the electric potential energy of the system :

(A) decreases

(B) increases

(C) remains constant

(D) becomes zero

10. A charged particle is projected along the magnetic field line. Magnetic force
on the particle is :

(A) Perpendicular to the velocity only

(B) Perpendicular to the magnetic field only

(C) Perpendicular to both the velocity and the magnetic field

(D) Zero

H-4702 [FT] 4

11. The magnetic hysteresis loop for a given ferromagnetic material is shown
in the figure. For the material to be suitable for making a permanent
magnet :

(A) OQ and OR both should be large

(B) OQ should be large and OR should be small

(C) OQ should be small, OR should be large

(D) OQ and OR both should be small

12. A sphere encloses an electric dipole with charges + 2 × 10 –6 C and

–2 × 10–6 C. Then total electric flux through the sphere is :

(A) 2 × 10–6 Nm2/C

(B) zero

(C) –2 × 10–6N m2/C

(D) 4 × 10–6 Nm2/C

H-4702 [FT] 5 P.T.O.

13. Choose the incorrect statement.

Equipotential surfaces :

(A) are closer in regions of large electric fields compared to regions of lower

electric fields

(B) are of concentric spherical shells for a point charge

(C) will be more crowded near sharp edges of a conductor

(D) will always be equally spaced

14. The threshold wavelength for a metal having work function 0
is 0
. What

is the threshold wavelength for a metal whose work function is /2 ?
0

(A) 2 0

(B) 4 0

(C) 0 2

(D) 0 4

15. The magnetic susceptibility is negative for :

(A) paramagnetic and ferromagnetic materials

(B) diamagnetic material only

(C) paramagnetic material only

(D) ferromagnetic material only

16. The net magnetic flux through any closed surface is :

(A) 0i

(B) 0

(C) i 0

(D) Zero

H-4702 [FT] 6

17. A proton is moving perpendicular to the magnetic field with speed v and
takes time T to complete one revolution. If the speed of the particle is
increased to 2v, then how much time will it take to complete one revolution ?

(A) T

(B) T/2

(C) 2T

(D) 4T

18. Consider a system of two point charges Q and –2Q which are placed some
distance apart. If the electric field at the location of Q is E, then the electric
field at the location of –2Q will be :

(A) –E/2

(B) –3E/2

(C) –E

(D) –2E

19. The equivalent resistance between the points M and N is :

(A) 9

(B)

(C) 12/13

(D) 13/12
H-4702 [FT] 7 P.T.O.

20. A regular hexagon of side 10 cm has a charge 5 C at each of its vertices.
The potential at the centre of the hexagon is :

(A) 3.7 × 10–6 V (B) 2.7 × 106 V

(C) 2.7 × 10–4 V (D) 3.7 × 104 V

21. In a potentiometer arrangement, a cell (A) of emf 1.25 V gives a balance
point at 35.0 cm length of the wire. If the cell (A) is replaced by another
cell (B) and the balance point shifts to 70.0 cm. The emf of cell (B) is :

(A) 2.5 V (B) 0.25 V

(C) 0.625 V (D) 6.25 V

22. The dependence of resistivity ( ) on temperature (T) for a typical
semiconductor is represented by :

(A) (B)

(C) (D)

H-4702 [FT] 8

23. Light of frequency 1.5 times the threshold frequency is incident on a
photosensitive material. What will be the photoelectric current if the
frequency is halved and intensity is doubled ?

(A) zero (B) one-fourth

(C) four times (D) doubled

24. The capacitance of a capacitor does not depend on :

(A) the size of the plates

(B) the charges on the plates

(C) the shape of the plates

(D) the separation between the plates

25. In the circuit shown, the current through the 4 resistor is 1 amp when
the points P and M are connected to a D.C. voltage source. The potential
difference between the points M and N is :

(A) 1.0 V (B) 0.5 V

(C) 3.2 V (D) 1.5 V
H-4702 [FT] 9 P.T.O.

26. The work done in rotating a bar magnet of magnetic moment m from its
unstable equilibrium position to its stable equilibrium position in a uniform
magnetic field B is :

(A) 2 mB

(B) mB

(C) –mB

(D) –2 mB

27. Three resistances P, Q, R each of 2 and an unknown resistance S form
the four arms of a Wheatstone bridge circuit. When a resistance of 6 is
connected in parallel to S the bridge gets balanced. What is the value of S ?

(A) 3

(B) 6

(C) 1

(D) 2
28. Four point charges qA = 2 C, qB = –5 C, qC = 2 C, and qD = –5 C are
located at the corners of a square ABCD of side 10 cm. The force on a
charge of 1 C placed at the centre of the square is :

(A) Zero N (B) 18 N

(C) 1 N (D) 9N

H-4702 [FT] 10

29. de-Broglie wavelength ( ) of a charge particle accelerated from rest by

potential difference V is related as :

(A) V

(B) V

(C) 1/ V

(D) 1/V

30. All photons present in a light beam of a particular frequency have :

(A) same energy but different momentum

(B) same momentum but different energy

(C) different energy and different momentum

(D) same energy and same momentum

31. Polar molecules are the molecules :

(A) which acquire a dipole moment only in the presence of electric field

due to displacement of charges

(B) which acquire a dipole moment against the direction of electric field

(C) having a permanent electric dipole moment

(D) having zero electric dipole moment

32. At a certain place vertical component of magnetic field of earth is 3 times
that of horizontal component. Then the angle of dip at this place will be :

(A) 300

(B) 450

(C) 600

(D) 900

H-4702 [FT] 11 P.T.O.

33. Two cells of emfs E1 and E2 (E2 > E1) and internal resistances r1 and r2
respectively are connected in parallel as shown in the following figure. The
equivalent emf Eeq of the two cells is :

(A) Smaller than E1

(B) Smaller than E2 but greater than E1

(C) Equal to E1 + E2

(D) Independent of internal resistances r1 and r2

34. When the light of frequency 2Y0 (where, Y0 = threshold frequency) is incident

on a metal plate, the maximum velocity of electrons emitted is v1. When the

frequency of the incident radiation is increased to 5Y0, the maximum velocity

of the electrons emitted from the same plate is v2. The ratio of v1 to v2 is :

(A) 4 : 1

(B) 1 : 4

(C) 1 : 2

(D) 2 : 1

H-4702 [FT] 12

35. Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage
sensitivity is 20 div/V. The resistance of the galvanometer is :
(A) 250
(B) 25
(C) 40
(D) 500
36. A current carrying square loop is suspended in a uniform magnetic field
acting in the plane of the loop. If the force on one arm of the loop is F ,
the net force on remaining three arms of the loop is :

(A) 3F

(B) F

(C) 3F

(D) F
37. Out of the following options, which one can be used to produce an
electromagnetic wave ?
(A) a charge moving at constant velocity
(B) an accelerating charge
(C) a stationary charge
(D) a chargeless particle
38. When equal current is passed through two circular coils, equal magnetic field
is produced at their centres. If the ratio of number of turns in the coils is
8 : 15, then the ratio of their radii will be :
(A) 1 : 1
(B) 15 : 8
(C) 8 : 15
(D) 1 : 2

H-4702 [FT] 13 P.T.O.

39. The resistance of a wire is 5 ohm at 50ºC and 6 ohm at 100ºC. The
resistance of the wire at 0oC will be :

(A) 1 ohm

(B) 4 ohm

(C) 3 ohm

(D) 2 ohm

40. A planar square loop of side ‘a’ carrying a steady current I2 is lying on a
horizontal surface near a long straight conductor carrying a steady current
I1 in the same plane at a distance ‘a’ as shown in figure.

The net force on the loop due to the wire will be :

0I1I 2
(A)
2

0I1I 2
(B)
3

(C) Zero

0I1I 2
(D)
4

H-4702 [FT] 14

Space For Rough Work

H-4702 [FT] 15 P.T.O.

Space For Rough Work

H-4702 [FT] 16