Class 12 PT I Question Paper 2025-26 Physics

PERIODIC TEST
QUESTION
PAPER
PT1 - PT2

BASED P
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Monthly Test-July 2025
Time: 90 min Class-XII Sub - Physics ​ ​ M. M. : 40
1. A big hollow metal sphere A is charged to 100 volts and another smaller hollow sphere B is
charged to 50 volts. If B is put inside A and joined with a metallic wire, then the direction of charge
flow:​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (1M)
(a) is from A to B (b) is from B to A ​ (c) no charge flows (d) depends on the radii of spheres.
2. Two charges 4q and q are placed at a distance ℓ apart. A third charged particle Q is placed at the
middle of them. If resultant force on q is zero then the value of Q is:​​ ​ ​ (1M)
(a) q ​ ​ ​ (b) –q ​ ​ ​ (c) 2q ​ ​ ​ (d) –2q
3. A solid conducting sphere having a charge Q is surrounded by an uncharged concentric conducting
spherical shell. Let the potential difference between the surface of the solid sphere and the outer
surface of the shell be V. If the shell is now given a charge –3Q the new potential difference between
the same two surfaces is: ​ ​ ​ ​ ​ ​ ​ (1M)
(a) V ​ ​ ​ (b) 2V ​​ ​ (c) 4V ​ ​ ​ (d) –2V
4. An electric dipole of moment p is placed normal to the lines of force of electric intensity E, then
the work done in deflecting it through an angle of 180° is: ​ ​ (1M)​​
(a) pE ​ ​ ​ (b) +2pE ​ ​ (c) –2pE ​ ​ (d) Zero
5. When a piece of aluminium wire of finite length is drawn to reduce its diameter to half its original
value, its resistance will become:​ ​ ​ ​ ​ ​ ​ (1M)​
(a) two times ​ ​ (b) four times ​​ (c) eight times ​ (d) sixteen times
6. A wire of resistance 12 ohms per meter is bent to form a complete of circle of radius 10 cm. The
resistance between its two diametrically opposite points is:​​ ​ (1M)​
(a) 6Ω ​​ ​ (b) 0.6πΩ ​ ​ (c) 3Ω ​​ ​ (d) 6πΩ
7. A cell having an emf ε and internal resistance r is connected across a variable external resistance R.
As the resistance R is increased, the plot of potential difference V across R is given by:​ (1M​

8. The current in a conductor varies with time t as I = 2t + 3t2 A where I is amperes and t in seconds.
Electric charge flowing through a section of the conductor during t = 2 s to t = 3 s is:​ (1M)
(a) 10 C ​ ​ (b) 24 C ​ ​ (c) 33 C ​ ​ (d) 44 C
9. A coil of one loop is made by a wire of length L and there after a coil of two loops is made by same

wire. The ratio of magnetic field at the centre of coils respectively:​​ ​ ​ (1M)
(a) 1 : 4 ​ ​ (b) 1 : 1 ​ ​ (c) 1 : 8 ​ ​ (d) 4 : 1
10. Two infinite long parallel wires carry equal currents in same direction. The magnetic field at a
mid-point in between the two wire is:​ ​ ​ ​ ​ ​ ​ (1M)​
(a) Twice the magnetic field produced due to each of the wires

(b) Half of the magnetic field produced due to each of the wires
(c) Square of the magnetic field produced due to each of the wires
(d) Zero
For question numbers 11 to 16, two statements are given-one labelled Assertion (A) and the other
labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d)
as given below.
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is NOT the correct explanation of A
c) A is true but R is false
d) A is false and R is also false
11. Assertion (A): Sensitive instruments can be protected from outside electrical influence by
enclosing them in a hollow conductor. (1M)
Reason(R): Potential inside the cavity is zero.​ ​ ​ ​ ​ ​ ​
12. Assertion(A): Work done by the electrostatic force in bringing the unit positive Charge form
infinity to the point P is positive. (1M)
Reason(R): The force on a unit positive test charge is attractive, so that the electrostatic force and the
displacement (from infinity to P) are in the same direction.​​ ​ ​ ​
13. Assertion(A): The presence of water molecules makes separation of ions easier in an electrolyte.
Reason(R): The presence of water molecules decreases the resistance of electrolyte.​ (1M)
14. Assertion(A): In the given circuit if lamp B or C fuses then the light emitted by lamp A decreases.
Reason(R): Voltage on A decreases.​ ​ ​ ​ ​ ​ ​ (1M)

15. Assertion (A): Magnetic field due to an infinite straight conductor varies inversely as the distance
from it. (1M)
Reason (R): The magnetic field due to a straight conductor is in the form of concentric circles.​
16. Assertion(A): Electric field at the surface of a charged conductor is always normal to the surface
at every point. (1M)
Reason(R): Electric field gives the magnitude & direction of electric force (𝐹) experienced by any
charge placed at any point.​ ​ ​ ​ ​ ​ ​ ​ ​ ​
17. Drift velocity is the average velocity of electrons in a conductor material due to an electric field.
In a conducting material, it is also proportional to the magnitude of an external electric field.

i) The drift velocity of electrons in a conductor is 0.8 mm/s. The potential difference across a
conducting wire is doubled keeping other factors constant. What is the value of new drift velocity?
(a) 0.4mm/s ​ ​ (b) 0.64 mm/s ​ (c) 1.6 mm/s ​ ​ (d) 0.2 mm/s​ ​ (1M)​
ii) How would be the current density of a conductor get affected when the potential difference is
tripled keeping other factors constant. (1M)
(a) Doubled ​ ​ (b) halved ​ ​ (c) no change ​​ (d) tripled​ ​ ​
iii) Two conducting wires of the same material, radii in the ratio 1:2 and lengths in the ratio 2:3 are
connected in series to a battery of emf 5V. What is the ratio of the drift velocities of electrons in the
two wires?​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (1M)
(a) 4:1 ​​ ​ (b) 1:3 ​​ ​ (c)2:3 ​ ​ ​ (d) 4:3​​ ​ ​
iv) A current of 3.2 A flows through a conducting wire of number density 1028 m-3 and cross-sectional
area 10-6 m2. The drift velocity of electrons in the wire is (1M)
(a)​ 4 mm/s ​ ​ (b) 2 mm/s ​ ​ (c) 1mm/s ​ ​ (d) 0.5 mm/s​ ​ ​
18. Two wires each of radius of cross-section r but of different materials are connected together end
to end (in series). If the densities of charge carriers in the two wires are in the ratio 1 : 4, find the
ratio of the drift velocities of electrons in the two wires. ​ ​ ​ ​ ​ (2M)
19. Work done in rotating dipole from 0° to 60° is W. Find torque required to hold the dipole at this
position.​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (2M)
20. In given network find out equivalent resistance of network. Also find current passing through
each resistor.​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (3M)

21. In the circuit shown in figure, find the current through the branch BD.​​ ​ (3M)

22. Write Biot-Savart law and using it derive formula for the magnitude and direction of magnetic
field at an axial point of a current carrying loop of radius R, carrying current I. What will be the value
of magnetic field at the centre of the loop?​ ​ ​ ​ ​ ​ ​ (5M)

23. A parallel plate capacitor of capacitance C is charged to a potential V by a battery & Q is
the charge stored in the capacitor. The battery is then disconnected and the distance between
the plates of the capacitor is increased by a small amount. What changes will occur in each of
the following quantities? Will they increase, decrease or remain the same? Give an explanation
in each case. (5M)
(a) Capacitance
(b) Charge
(c) Potential difference
(d) Electric field
(e) Energy stored in the capacitor.

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