A is true but R is false. Rusting of iron is a chemical process but not endothermic; it is a slow exothermic reaction, releasing little heat. Since the heat released is negligible, it often goes unnoticed, making the given ...
Category: Class 10 Science
NCERT Solutions for Class 10 Science and important questions for CBSE class 10 for session 2020-2021
Discussion Forum Latest Questions
The correct option is (a) Broken down by biological processes. Biodegradable substances like food waste, paper, and leaves decompose naturally through bacteria and fungi, turning into harmless products. They don’t accumulate in the environment and are eco-friendly compared to plastics. cbse ...
The correct option is (c) CFCs; Ozone. In 1987, the Montreal Protocol was signed to stop production of chlorofluorocarbons (CFCs), which deplete the ozone layer that protects Earth from harmful ultraviolet radiation. This step helped save the ozone. cbse sample paper ...
The correct option is (c) scattering of light. When sunlight enters the atmosphere, fine particles like dust and gases scatter the light in all directions. This scattering makes the sky appear blue and causes reddish sunsets. CBSE Class 10 Science Question ...
The correct option is (d) behind the mirror and its position varies according to the object distance. A convex mirror always forms a virtual, upright, and diminished image behind the mirror. The image position changes slightly with object distance. CBSE Class ...