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 ...
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The correct answer is option (c) glass slab. When a parallel beam of light passes through a glass slab, it emerges parallel but laterally displaced. Unlike mirrors, lenses, or prisms, only a glass slab produces this unique lateral displacement effect. latest ...
Two observations that indicate a chemical change are: (1) Formation of a new substance, such as a gas, precipitate, or color change. (2) Release or absorption of energy, like heat, light, or sound, during the reaction. 2025-26 sample paper question available ...
Self-pollination occurs when pollen from a flower’s anther falls on its own stigma, ensuring genetic similarity. Cross-pollination occurs when pollen from one flower reaches the stigma of another, promoting genetic variation. extra cbse sample paper download on Tiwari Academy latest cbse sample ...
In herbivores, the small intestine is very long because plant-based food, rich in cellulose, takes longer to digest. In carnivores, it is comparatively shorter as meat is easier to digest. Thus, intestine length depends on the type of diet. 2025-26 sample ...