Karnataka SSLC 10th Science Question Paper 2024

For a convex lens, a virtual and erect image is formed only when the object is placed between the optical centre (O) and the principal focus (F1). Option (a) results in a diminished, real, and inverted image. Option (b) results in a real, inverted, and magnified image. Option (c) results in a real, inverted, and highly magnified image formed at infinity.

According to Rayleigh's law of scattering, the intensity of scattered light is inversely proportional to the fourth power of its wavelength ($\lambda^{-4}$). Red light has the longest wavelength in the visible spectrum and therefore scatters the least. Blue and violet light have much shorter wavelengths and scatter significantly more.

A long straight solenoid produces a magnetic field that is uniform (same in both magnitude and direction) at all points inside, resembling the field of a bar magnet. Outside the solenoid, the field is negligible.

The sky appears dark to an astronaut at high altitudes because there is no atmosphere at those heights to scatter sunlight. Blue light is scattered by the atmosphere, which is why the sky appears blue from the Earth's surface. Therefore, stating the sky appears blue at high altitudes is the wrong statement. Options (a), (c), and (d) are all correct phenomena related to atmospheric refraction.

i) Wires crossing without joining: Represented by two lines crossing where one has a small semi-circular hump over the other. ii) Voltmeter: Represented by a circle with the letter 'V' inside, having two connecting terminals.