When light travels from medium A (refractive index 1.6) to medium B (1.8), it enters a denser medium. Light slows down and bends towards the normal, proving A → B causes bending towards the normal. sample paper for class 10 science ...
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Arteries have thick, elastic walls to withstand and maintain high pressure from blood pumped by the heart. Veins carry blood at lower pressure, so they contain valves to prevent backflow and ensure unidirectional movement. sample paper for class 10 science board ...
The purpose of urine formation is to remove nitrogenous wastes like urea and excess water, maintaining body balance. Urine is stored in the urinary bladder and released from the body through the urethra. class 10 science half yearly 2025 cbse class 10 ...
When dilute HCl reacts with zinc granules, bubbles of hydrogen gas are released, showing effervescence. Also, zinc chloride solution forms. These two observable changes confirm that a new substance is formed, proving chemical change. class 10 science half yearly 2025 cbse class ...
A is true but R is false. Biodegradable substances like food waste or leaves decompose into simpler organic matter, forming compost and replenishing soil. The reason is false, as it mentions inorganic substances instead of organic substances. Assertion is ...