Karnataka 2nd PUC Physics Question Paper 2025 (7th March), Download Solutions PDF

Karnataka 2nd PUC Physics Question Paper 2025: Highlights

Important highlights of Karnataka 2nd PUC physics exam are given below:

2nd PUC Physics Question Paper 2025 PDF

Students can download the Karnataka PUC physics question paper PDF and practice from it for the next exam. Students who are going to appear next year must go through the previous year's question paper PDF.

Karnataka 2nd PUC Physics Answer Key and Solution

Students can check the Karnataka 2nd PUC physics answer key and solution here. The answer key and solution are available now. stay tuned to this page for the complete question and answer Key.

Q1. Answer: (d) does not change
- According to Coulomb's Law, the force between two point charges depends only on their magnitudes and the distance between them:

$$
F=\frac{k\left|q_1 q_2\right|}{r^2}
$$

- The introduction of a third charge $q_3$ may exert an additional force on $q_2$, but the force due to $q_1$ on $q_2$ remains unchanged as it depends only on their mutual distance and charges.
Q2. Answer: (a) spherical
- Equipotential surfaces are surfaces where the potential is constant.
- For an isolated point charge, the potential at a distance $r$ from the charge is given by:

$$
V=\frac{k q}{r}
$$

- This means all points at the same distance from the charge have the same potential, forming spherical equipotential surfaces centred around the charge.

Q3. Answer: (b) virtual, erect, and magnified

• A microscope consists of two lenses: an objective lens and an eyepiece.
• The objective lens forms a real, inverted, and magnified image of the object.
• This image then acts as an object for the eyepiece, which functions like a magnifying glass.
• The eyepiece produces a virtual, erect, and magnified final image.

Q4. Answer: (a) Light waves of the same wavelength coming from two independent sources can be coherent and can produce interference

• Coherence means the waves maintain a constant phase difference.
• Independent light sources emit waves with random phase differences, making them incoherent.
• Only waves from the same source or a single wave split into two coherent sources (like in Young’s double-slit experiment) can produce interference.

Q5. Answer: (b) keeps decreasing
- The de Broglie wavelength is given by:

$$
\lambda=\frac{h}{p}
$$

where $h$ is Planck's constant and $p=m v$ is the momentum.
-As the ball falls, its velocity increases due to gravity, meaning its momentum increases. Since $\lambda$ is inversely proportional to momentum, the wavelength keeps decreasing.

Karnataka II PUC Physics Board Exam Expected Questions

Students must practice these given questions to become familiar with the question trends of Karnataka's 2nd PUC physics paper 2025.

Q. . An electric dipole is placed in a uniform electric field. In which orientation is it in unstable equilibrium?

a) Parallel to the field

b) Perpendicular to the field

c) Anti-parallel to the field

d) None of the above

Q. A 10Ω resistor is connected in series with a 12V battery. What is the power dissipated in the resistor?

a) 1.2 W

b) 12 W

c) 14.4 W

d) 24 W

Q. A solenoid carries a current of 2A. If the number of turns per unit length is doubled, what happens to the magnetic field inside the solenoid?

a) Doubles

b) Halves

c) Remains unchanged

d) Becomes zero

Q. In an AC circuit, the peak voltage is 220V. What is the RMS voltage?

a) 110V

b) 155.6V

c) 220V

d) 311V

Q. A ray of light passes from water (refractive index = 1.33) to air. If the angle of incidence is greater than the critical angle, what will happen?

a) The ray bends towards the normal

b) The ray bends away from the normal

c) The ray is completely reflected back into the water

d) The ray is absorbed by the water

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