Entrance Exams
Govt. Exams
The relationship between focal length (f) and radius of curvature (R) is: R = 2f. Therefore, R = 2 × 20 = 40 cm.
Melting of ice is an endothermic process as it requires heat energy input to convert solid ice into liquid water. Other options are exothermic reactions that release heat.
Using Distance = Speed × Time: Distance = 3 × 10⁸ × 2 = 6 × 10⁸ meters.
Using the formula F = (9/5)C + 32, when C = F, we get C = (9/5)C + 32, solving gives C = -40°
Light and electrons exhibit wave-particle duality, meaning they behave as both waves and particles depending on the experiment.
The pH scale ranges from 0 to 14, where 7 is neutral, below 7 is acidic, and above 7 is basic/alkaline.
Gravitational potential energy = mgh = 5 × 10 × 2 = 100 J
Insulin, produced by the pancreas, regulates blood glucose levels by promoting glucose uptake by cells.
Coal is a non-renewable fossil fuel that takes millions of years to form. Solar, wind, and hydroelectric are renewable sources.
Fluorine has the highest electronegativity value (3.98) on the Pauling scale. Electronegativity is the tendency of an atom to attract electrons in a chemical bond. As we go from fluorine down the halogen group, electronegativity decreases.