The reddish-brown metal X is copper (Cu). When heated in air, it forms black copper(II) oxide (CuO) or Y. On heating with hydrogen, CuO reduces back to Cu, used in electrical wiring. class 10 science Question Paper answer key cbse class 10 ...
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We are advised to take iodised salt because Iodine is essential for the synthesis of thyroxin hormone. Thyroxin regulates carbohydrate, protein and fat metabolism in the body. Thyroxin provide best balance for growth in the body. CBSE Class 10 Science Question ...
The probability of a girl or a boy being born in a family is 50% chances for each. This is because the chances of inheriting an X or Y chromosome from the father are equally likely, making both outcomes equally ...
Joule’s Law of Heating states that heat produced in a conductor is directly proportional to the square of current, the resistance of the conductor, and the time for which current flows: H = I²Rt. CBSE Class 10 Science Question Paper 2025 ...
The resistance of a conductor depends on its length (l), area of cross-section (A), nature of material, and temperature. It increases with length, decreases with thickness, and varies with the type and temperature of the material. cbse class 10 previous year ...