Karnataka SSLC 10th Science Question Paper 2025

According to Fleming's Left-Hand Rule, the thumb points in the direction of the force (motion), the index finger points in the direction of the magnetic field, and the middle finger points in the direction of the electric current. Therefore, (a) is correct. Induced current (b) is associated with Fleming's Right-Hand Rule.

The electric power is calculated using the formula $P = V \times I$. Given $V = 220 \text{ V}$ and $I = 0.75 \text{ A}$, then $P = 220 \times 0.75 = 165 \text{ W}$. Thus, option (c) is correct.

The magnetic field produced by a current-carrying circular coil is directly proportional to the number of turns ($n$). Thus, if the number of turns is increased by 10 times, the magnetic field also increases by 10 times. Option (b) is correct.

i) Electric cell: A symbol consisting of two parallel vertical lines of unequal length, where the longer line represents the positive terminal (+) and the shorter, thicker line represents the negative terminal (-). ii) Rheostat/Variable resistance: A symbol consisting of a resistor (a zigzag line) with an arrow pointing across it or a slider moving along the resistor.

No, a spectrum of light will not be seen on the screen. When white light passes through prism A, it splits into its component colors (dispersion). If prism B is placed in an inverted position relative to prism A, it recombines the dispersed colors back into a single beam of white light. Therefore, the light emerging from prism B is white light, and no spectrum is formed on the screen.