Mobile phones, laptops, and televisions are all electronic devices that are used for communication, entertainment, or information purposes.
On the other hand, a transformer is an electrical device used to transfer electrical energy between circuits, and it doesn’t belong to the same category as the other items.
Thus, the correct answer is (a) 1, 2 and 3, as these are all electronic devices used by consumers for different purposes.
An object is said to have an n-fold rotational symmetry if the object, rotated by an angle of \( \frac{2\pi}{n} \), is identical to the original.
Which one of the following objects exhibits 4-fold rotational symmetry about an axis perpendicular to the plane of the screen?
A color model is shown in the figure with color codes: Yellow (Y), Magenta (M), Cyan (Cy), Red (R), Blue (Bl), Green (G), and Black (K). Which one of the following options displays the color codes that are consistent with the color model?