Karnataka SSLC 10th Science Question Paper 2024

Silicon is a semiconductor material used to manufacture solar cells because its electronic properties are ideal for converting sunlight into electricity. Carbon, phosphorus, and sulphur do not have the semiconductor properties required for the photovoltaic effect.

For four resistors each of $R = 2 \Omega$ in series, $R_s = R + R + R + R = 4 \times 2 = 8 \Omega$. For the same resistors in parallel, $\frac{1}{R_p} = \frac{1}{2} + \frac{1}{2} + \frac{1}{2} + \frac{1}{2} = \frac{4}{2} = 2$, so $R_p = 0.5 \Omega$. The ratio $R_s / R_p = 8 / 0.5 = 16$. Thus, the ratio is 16:1.

According to Rayleigh scattering, smaller particles scatter shorter wavelengths (blue/violet), whereas larger particles (like water droplets in clouds) scatter all wavelengths almost equally, which is why clouds appear white. Choice (a), (b), and (c) are incorrect because they misidentify the relationship between particle size and wavelength scattering.

i) Combination of two cells: Two long lines (positive terminals) and two short lines (negative terminals) connected by lines, represented as $| | | |$. ii) Wires crossing without joining: Two lines crossing each other with a small 'hump' or loop on one of the lines to indicate they are not touching.

The power $P = 2kW = 2000W$. The voltage $V = 220V$. The current drawn by the heater is $I = P/V = 2000/220 \approx 9.09A$. Since the current drawn (9.09 A) is less than the rated capacity of the circuit (15 A), the electric heater can be safely connected.