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 ...
Discussion Forum Latest Questions
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 ...
(i) Anannya’s answer is incorrect. Three-pin plugs are used for earthing, not to reduce heating. (ii) A fuse prevents damage by melting and breaking the circuit when excessive current flows, protecting appliances from short circuits. cbse class 10 previous year question ...
It is wrong to say that plants do not produce excretory products. Plants excrete wastes differently from animals. Oxygen is released through stomata, excess water by transpiration, and other wastes are stored in dead cells, gums, resins, vacuoles, or removed ...
The correct option is (D). The assertion is false because vultures, being top consumers, have the highest pesticide accumulation due to biological magnification. The reason is true about energy transfer but doesn’t explain it correctly. CBSE Class 10 Science Question Paper ...