Magnetic Effects of Electric Current — Science STD 10 — Question

What are rods and cones in the retina of an? Why is our night vision relatively poor compared to the night vision of an owl?

Which of the following are endothermic reactions and which are exothermic reactions?

1. Burning of natural gas.
2. Photosynthesis.
3. Electrolysis of water.
4. Respiration.
5. Decomposition of calcium carbonate.

State Mendeleev’s periodic law.

How would you test for an alcohol?

Write balanced chemical equation with state symbols for the following reaction:
Barium chloride solution reacts with sodium sulphate solution to give insoluble barium sulphate and a solution of sodium chloride.

State two factors on which the lateral displacement of the emergent ray depends.

Forest resources ought to be used in a manner that is both environmentally and developmentally sound. Explain this briefly.

If a milky of cloudy membrane grow over the eye lens, then which defect is the person suffering from?

A person found that the cake prepared by him is hard and small in size. Which ingredient has he forgotten to add that would have caused the cake to rise and become light? Explain your answer.

What is the unit of power of a lens? Define the unit of power of a lens.