Control and Coordination — Science STD 10 — Question

What change should be made in an a.c. generator so that it may become a d.c. generator?

Ammonia reacts with oxygen to form nitrogen and water. Write a balanced chemical equation for this reaction. Add the state symbols for all the reactants and products.

What colour does the turmeric paper turn when put in an alkaline solution?

Which property of copper and aluminium makes them suitable:
For making electric wires?

In a human, how many chromosmes are present in:a brain cell?

Where does a fertilised ovum develop into a baby in the human body?

Which produces more energy: nuclear fusion or nuclear fission?

What colour does the sky appear to an astronaut?

Name two metals which are used:
For making domestic utensils and factory equipment.

Name a natural phenomenon which is caused by the dispersion of sunlight in the sky.